commit 376bede2d966c67466772c547b7ad05f99402bc4
Author: Alexander Rogachev <[email protected]>
Date: Sat Apr 27 03:51:42 2024 +0400
[st][patch][ligatures] Update ligature patches for 0.9.2.
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-20240427-0.9.2.diff
new file mode 100644
index 00000000..b6832a67
--- /dev/null
+++ b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-20240427-0.9.2.diff
@@ -0,0 +1,633 @@
+diff --git a/Makefile b/Makefile
+index 470ac86..38240da 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c
++SRC = st.c x.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,7 +22,8 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 1e306f8..3e13e53 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
+ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..99412c8
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index 62def59..041c6d8 100644
+--- a/st.c
++++ b/st.c
+@@ -2640,7 +2640,8 @@ draw(void)
+
+ drawregion(0, 0, term.col, term.row);
+ xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+- term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
++ term.ocx, term.ocy, term.line[term.ocy][term.ocx],
++ term.line[term.ocy], term.col);
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index fd3b0d8..142fdfe 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index 2a3bd38..66605ae 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -141,8 +142,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -757,7 +759,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1062,6 +1064,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1185,7 +1190,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1239,6 +1244,22 @@ xinit(int cols, int rows)
+ xsel.xtarget = XA_STRING;
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1253,128 +1274,156 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (shaped.glyphs[code_idx].codepoint != 0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1510,21 +1559,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1652,18 +1704,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1672,8 +1722,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-20240427-0.9.2.diff
new file mode 100644
index 00000000..a4ac3f7d
--- /dev/null
+++
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-20240427-0.9.2.diff
@@ -0,0 +1,635 @@
+diff --git a/Makefile b/Makefile
+index 470ac86..38240da 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c
++SRC = st.c x.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,7 +22,8 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 47c615e..d7439a3 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
+-LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender\
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
++LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..58d534b
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index 62def59..041c6d8 100644
+--- a/st.c
++++ b/st.c
+@@ -2640,7 +2640,8 @@ draw(void)
+
+ drawregion(0, 0, term.col, term.row);
+ xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+- term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
++ term.ocx, term.ocy, term.line[term.ocy][term.ocx],
++ term.line[term.ocy], term.col);
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index 9f91e2a..b1a6256 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index 27e81d1..0632636 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -142,8 +143,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -759,7 +761,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1071,6 +1073,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1202,7 +1207,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1256,6 +1261,22 @@ xinit(int cols, int rows)
+ xsel.xtarget = XA_STRING;
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1270,128 +1291,157 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (shaped.glyphs[code_idx].codepoint != 0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
++ hbcleanup(&shaped);
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1527,21 +1577,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1669,18 +1722,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1689,8 +1740,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-scrollback-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-scrollback-20240427-0.9.2.diff
new file mode 100644
index 00000000..3e9d6751
--- /dev/null
+++
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-scrollback-20240427-0.9.2.diff
@@ -0,0 +1,635 @@
+diff --git a/Makefile b/Makefile
+index 470ac86..38240da 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c
++SRC = st.c x.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,7 +22,8 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 47c615e..d7439a3 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
+-LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender\
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
++LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..99412c8
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index 79ee9ba..454771d 100644
+--- a/st.c
++++ b/st.c
+@@ -2711,7 +2711,9 @@ draw(void)
+ drawregion(0, 0, term.col, term.row);
+ if (term.scr == 0)
+ xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+- term.ocx, term.ocy,
term.line[term.ocy][term.ocx]);
++ term.ocx, term.ocy,
term.line[term.ocy][term.ocx],
++ term.line[term.ocy], term.col);
++
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index 78762a2..01eea49 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index 27e81d1..5e11c1f 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -142,8 +143,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -759,7 +761,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1071,6 +1073,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1202,7 +1207,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1256,6 +1261,22 @@ xinit(int cols, int rows)
+ xsel.xtarget = XA_STRING;
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1270,128 +1291,156 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (shaped.glyphs[code_idx].codepoint != 0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1527,21 +1576,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1669,18 +1721,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1689,8 +1739,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-scrollback-ringbuffer-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-scrollback-ringbuffer-20240427-0.9.2.diff
new file mode 100644
index 00000000..5d03b4df
--- /dev/null
+++
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-alpha-scrollback-ringbuffer-20240427-0.9.2.diff
@@ -0,0 +1,635 @@
+diff --git a/Makefile b/Makefile
+index 470ac86..38240da 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c
++SRC = st.c x.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,7 +22,8 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 47c615e..d7439a3 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
+-LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender\
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
++LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft -lXrender \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..99412c8
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index c44797b..18aa1bf 100644
+--- a/st.c
++++ b/st.c
+@@ -2759,7 +2759,9 @@ draw(void)
+ drawregion(0, 0, term.col, term.row);
+ if (TSCREEN.off == 0)
+ xdrawcursor(cx, term.c.y, TLINE(term.c.y)[cx],
+- term.ocx, term.ocy, TLINE(term.ocy)[term.ocx]);
++ term.ocx, term.ocy, TLINE(term.ocy)[term.ocx],
++ TLINE(term.ocy), term.col);
++
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index 073851a..d0b071d 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index b81f5be..c1611bb 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -144,8 +145,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -761,7 +763,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1073,6 +1075,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1204,7 +1209,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1258,6 +1263,22 @@ xinit(int cols, int rows)
+ xsel.xtarget = XA_STRING;
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1272,128 +1293,156 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (shaped.glyphs[code_idx].codepoint != 0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1529,21 +1578,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1671,18 +1723,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1691,8 +1741,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-boxdraw-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-boxdraw-20240427-0.9.2.diff
new file mode 100644
index 00000000..2a92a30b
--- /dev/null
+++
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-boxdraw-20240427-0.9.2.diff
@@ -0,0 +1,647 @@
+diff --git a/Makefile b/Makefile
+index 6dfa212..adfa07a 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c boxdraw.c
++SRC = st.c x.c boxdraw.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,8 +22,9 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
+ boxdraw.o: config.h st.h boxdraw_data.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 1e306f8..3e13e53 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
+ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..99412c8
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index 41d5ace..1c2edd6 100644
+--- a/st.c
++++ b/st.c
+@@ -2643,7 +2643,8 @@ draw(void)
+
+ drawregion(0, 0, term.col, term.row);
+ xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+- term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
++ term.ocx, term.ocy, term.line[term.ocy][term.ocx],
++ term.line[term.ocy], term.col);
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index 808f5f7..ae41368 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index bf6bbf9..96b117f 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -141,8 +142,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -757,7 +759,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1062,6 +1064,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1185,7 +1190,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1241,6 +1246,22 @@ xinit(int cols, int rows)
+ boxdraw_xinit(xw.dpy, xw.cmap, xw.draw, xw.vis);
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1255,133 +1276,164 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- if (mode & ATTR_BOXDRAW) {
+- /* minor shoehorning: boxdraw uses only this ushort */
+- glyphidx = boxdrawindex(&glyphs[i]);
+- } else {
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- }
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (glyphs[start + idx].mode & ATTR_BOXDRAW) {
++ /* minor shoehorning: boxdraw uses only
this ushort */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
boxdrawindex(&glyphs[start + idx]);
++ specs[numspecs].x = xp;
++ specs[numspecs].y = yp;
++ numspecs++;
++ } else if (shaped.glyphs[code_idx].codepoint !=
0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
++ hbcleanup(&shaped);
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1521,21 +1573,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1663,18 +1718,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1683,8 +1736,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-scrollback-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-scrollback-20240427-0.9.2.diff
new file mode 100644
index 00000000..92edf9a1
--- /dev/null
+++
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-scrollback-20240427-0.9.2.diff
@@ -0,0 +1,634 @@
+diff --git a/Makefile b/Makefile
+index 470ac86..38240da 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c
++SRC = st.c x.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,7 +22,8 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 1e306f8..3e13e53 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
+ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..99412c8
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index 79ee9ba..7675db6 100644
+--- a/st.c
++++ b/st.c
+@@ -2711,7 +2711,8 @@ draw(void)
+ drawregion(0, 0, term.col, term.row);
+ if (term.scr == 0)
+ xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
+- term.ocx, term.ocy,
term.line[term.ocy][term.ocx]);
++ term.ocx, term.ocy,
term.line[term.ocy][term.ocx],
++ term.line[term.ocy], term.col);
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index 818a6f8..4e584b6 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index 2a3bd38..0bb51ff 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -141,8 +142,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -757,7 +759,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1062,6 +1064,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1185,7 +1190,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1239,6 +1244,22 @@ xinit(int cols, int rows)
+ xsel.xtarget = XA_STRING;
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1253,128 +1274,157 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (shaped.glyphs[code_idx].codepoint != 0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
++ hbcleanup(&shaped);
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1510,21 +1560,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1652,18 +1705,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1672,8 +1723,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git
a/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-scrollback-ringbuffer-20240427-0.9.2.diff
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-scrollback-ringbuffer-20240427-0.9.2.diff
new file mode 100644
index 00000000..26105db4
--- /dev/null
+++
b/st.suckless.org/patches/ligatures/0.9.2/st-ligatures-scrollback-ringbuffer-20240427-0.9.2.diff
@@ -0,0 +1,633 @@
+diff --git a/Makefile b/Makefile
+index 470ac86..38240da 100644
+--- a/Makefile
++++ b/Makefile
+@@ -4,7 +4,7 @@
+
+ include config.mk
+
+-SRC = st.c x.c
++SRC = st.c x.c hb.c
+ OBJ = $(SRC:.c=.o)
+
+ all: st
+@@ -22,7 +22,8 @@ config.h:
+ $(CC) $(STCFLAGS) -c $<
+
+ st.o: config.h st.h win.h
+-x.o: arg.h config.h st.h win.h
++x.o: arg.h config.h st.h win.h hb.h
++hb.o: st.h
+
+ $(OBJ): config.h config.mk
+
+diff --git a/config.mk b/config.mk
+index 1e306f8..3e13e53 100644
+--- a/config.mk
++++ b/config.mk
+@@ -15,10 +15,12 @@ PKG_CONFIG = pkg-config
+ # includes and libs
+ INCS = -I$(X11INC) \
+ `$(PKG_CONFIG) --cflags fontconfig` \
+- `$(PKG_CONFIG) --cflags freetype2`
++ `$(PKG_CONFIG) --cflags freetype2` \
++ `$(PKG_CONFIG) --cflags harfbuzz`
+ LIBS = -L$(X11LIB) -lm -lrt -lX11 -lutil -lXft \
+ `$(PKG_CONFIG) --libs fontconfig` \
+- `$(PKG_CONFIG) --libs freetype2`
++ `$(PKG_CONFIG) --libs freetype2` \
++ `$(PKG_CONFIG) --libs harfbuzz`
+
+ # flags
+ STCPPFLAGS = -DVERSION=\"$(VERSION)\" -D_XOPEN_SOURCE=600
+diff --git a/hb.c b/hb.c
+new file mode 100644
+index 0000000..99412c8
+--- /dev/null
++++ b/hb.c
+@@ -0,0 +1,125 @@
++#include <stdlib.h>
++#include <stdio.h>
++#include <math.h>
++#include <X11/Xft/Xft.h>
++#include <X11/cursorfont.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++#include "st.h"
++#include "hb.h"
++
++#define FEATURE(c1,c2,c3,c4) { .tag = HB_TAG(c1,c2,c3,c4), .value = 1, .start
= HB_FEATURE_GLOBAL_START, .end = HB_FEATURE_GLOBAL_END }
++#define BUFFER_STEP 256
++
++hb_font_t *hbfindfont(XftFont *match);
++
++typedef struct {
++ XftFont *match;
++ hb_font_t *font;
++} HbFontMatch;
++
++typedef struct {
++ size_t capacity;
++ HbFontMatch *fonts;
++} HbFontCache;
++
++static HbFontCache hbfontcache = { 0, NULL };
++
++typedef struct {
++ size_t capacity;
++ Rune *runes;
++} RuneBuffer;
++
++static RuneBuffer hbrunebuffer = { 0, NULL };
++
++/*
++ * Poplulate the array with a list of font features, wrapped in FEATURE macro,
++ * e. g.
++ * FEATURE('c', 'a', 'l', 't'), FEATURE('d', 'l', 'i', 'g')
++ */
++hb_feature_t features[] = { };
++
++void
++hbunloadfonts()
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ hb_font_destroy(hbfontcache.fonts[i].font);
++ XftUnlockFace(hbfontcache.fonts[i].match);
++ }
++
++ if (hbfontcache.fonts != NULL) {
++ free(hbfontcache.fonts);
++ hbfontcache.fonts = NULL;
++ }
++ hbfontcache.capacity = 0;
++}
++
++hb_font_t *
++hbfindfont(XftFont *match)
++{
++ for (int i = 0; i < hbfontcache.capacity; i++) {
++ if (hbfontcache.fonts[i].match == match)
++ return hbfontcache.fonts[i].font;
++ }
++
++ /* Font not found in cache, caching it now. */
++ hbfontcache.fonts = realloc(hbfontcache.fonts, sizeof(HbFontMatch) *
(hbfontcache.capacity + 1));
++ FT_Face face = XftLockFace(match);
++ hb_font_t *font = hb_ft_font_create(face, NULL);
++ if (font == NULL)
++ die("Failed to load Harfbuzz font.");
++
++ hbfontcache.fonts[hbfontcache.capacity].match = match;
++ hbfontcache.fonts[hbfontcache.capacity].font = font;
++ hbfontcache.capacity += 1;
++
++ return font;
++}
++
++void hbtransform(HbTransformData *data, XftFont *xfont, const Glyph *glyphs,
int start, int length) {
++ ushort mode = USHRT_MAX;
++ unsigned int glyph_count;
++ int rune_idx, glyph_idx, end = start + length;
++
++ hb_font_t *font = hbfindfont(xfont);
++ if (font == NULL)
++ return;
++
++ hb_buffer_t *buffer = hb_buffer_create();
++ hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
++ hb_buffer_set_cluster_level(buffer,
HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
++
++ /* Resize the buffer if required length is larger. */
++ if (hbrunebuffer.capacity < length) {
++ hbrunebuffer.capacity = (length / BUFFER_STEP + 1) *
BUFFER_STEP;
++ hbrunebuffer.runes = realloc(hbrunebuffer.runes,
hbrunebuffer.capacity * sizeof(Rune));
++ }
++
++ /* Fill buffer with codepoints. */
++ for (rune_idx = 0, glyph_idx = start; glyph_idx < end; glyph_idx++,
rune_idx++) {
++ hbrunebuffer.runes[rune_idx] = glyphs[glyph_idx].u;
++ mode = glyphs[glyph_idx].mode;
++ if (mode & ATTR_WDUMMY)
++ hbrunebuffer.runes[rune_idx] = 0x0020;
++ }
++ hb_buffer_add_codepoints(buffer, hbrunebuffer.runes, length, 0, length);
++
++ /* Shape the segment. */
++ hb_shape(font, buffer, features, sizeof(features)/sizeof(hb_feature_t));
++
++ /* Get new glyph info. */
++ hb_glyph_info_t *info = hb_buffer_get_glyph_infos(buffer, &glyph_count);
++ hb_glyph_position_t *pos = hb_buffer_get_glyph_positions(buffer,
&glyph_count);
++
++ /* Fill the output. */
++ data->buffer = buffer;
++ data->glyphs = info;
++ data->positions = pos;
++ data->count = glyph_count;
++}
++
++void hbcleanup(HbTransformData *data) {
++ hb_buffer_destroy(data->buffer);
++ memset(data, 0, sizeof(HbTransformData));
++}
+diff --git a/hb.h b/hb.h
+new file mode 100644
+index 0000000..3b0ef44
+--- /dev/null
++++ b/hb.h
+@@ -0,0 +1,14 @@
++#include <X11/Xft/Xft.h>
++#include <hb.h>
++#include <hb-ft.h>
++
++typedef struct {
++ hb_buffer_t *buffer;
++ hb_glyph_info_t *glyphs;
++ hb_glyph_position_t *positions;
++ unsigned int count;
++} HbTransformData;
++
++void hbunloadfonts();
++void hbtransform(HbTransformData *, XftFont *, const Glyph *, int, int);
++void hbcleanup(HbTransformData *);
+diff --git a/st.c b/st.c
+index c44797b..91f54dc 100644
+--- a/st.c
++++ b/st.c
+@@ -2759,7 +2759,8 @@ draw(void)
+ drawregion(0, 0, term.col, term.row);
+ if (TSCREEN.off == 0)
+ xdrawcursor(cx, term.c.y, TLINE(term.c.y)[cx],
+- term.ocx, term.ocy, TLINE(term.ocy)[term.ocx]);
++ term.ocx, term.ocy, TLINE(term.ocy)[term.ocx],
++ TLINE(term.ocy), term.col);
+ term.ocx = cx;
+ term.ocy = term.c.y;
+ xfinishdraw();
+diff --git a/st.h b/st.h
+index 3cea73b..709a369 100644
+--- a/st.h
++++ b/st.h
+@@ -11,7 +11,8 @@
+ #define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
+ #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
+ #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b)
: (x)
+-#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
++#define ATTRCMP(a, b) (((a).mode & (~ATTR_WRAP)) != ((b).mode &
(~ATTR_WRAP)) || \
++ (a).fg != (b).fg || \
+ (a).bg != (b).bg)
+ #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + \
+ (t1.tv_nsec-t2.tv_nsec)/1E6)
+diff --git a/win.h b/win.h
+index 6de960d..94679e4 100644
+--- a/win.h
++++ b/win.h
+@@ -25,7 +25,7 @@ enum win_mode {
+
+ void xbell(void);
+ void xclipcopy(void);
+-void xdrawcursor(int, int, Glyph, int, int, Glyph);
++void xdrawcursor(int, int, Glyph, int, int, Glyph, Line, int);
+ void xdrawline(Line, int, int, int);
+ void xfinishdraw(void);
+ void xloadcols(void);
+diff --git a/x.c b/x.c
+index 9891e91..7d42790 100644
+--- a/x.c
++++ b/x.c
+@@ -19,6 +19,7 @@ char *argv0;
+ #include "arg.h"
+ #include "st.h"
+ #include "win.h"
++#include "hb.h"
+
+ /* types used in config.h */
+ typedef struct {
+@@ -143,8 +144,9 @@ typedef struct {
+ } DC;
+
+ static inline ushort sixd_to_16bit(int);
++static void xresetfontsettings(ushort mode, Font **font, int *frcflags);
+ static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int,
int);
+-static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int);
++static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int,
int, int);
+ static void xdrawglyph(Glyph, int, int);
+ static void xclear(int, int, int, int);
+ static int xgeommasktogravity(int);
+@@ -759,7 +761,7 @@ xresize(int col, int row)
+ xclear(0, 0, win.w, win.h);
+
+ /* resize to new width */
+- xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
++ xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec) * 4);
+ }
+
+ ushort
+@@ -1064,6 +1066,9 @@ xunloadfont(Font *f)
+ void
+ xunloadfonts(void)
+ {
++ /* Clear Harfbuzz font cache. */
++ hbunloadfonts();
++
+ /* Free the loaded fonts in the font cache. */
+ while (frclen > 0)
+ XftFontClose(xw.dpy, frc[--frclen].font);
+@@ -1187,7 +1192,7 @@ xinit(int cols, int rows)
+ XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
+
+ /* font spec buffer */
+- xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
++ xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec) * 4);
+
+ /* Xft rendering context */
+ xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
+@@ -1241,6 +1246,22 @@ xinit(int cols, int rows)
+ xsel.xtarget = XA_STRING;
+ }
+
++void
++xresetfontsettings(ushort mode, Font **font, int *frcflags)
++{
++ *font = &dc.font;
++ if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
++ *font = &dc.ibfont;
++ *frcflags = FRC_ITALICBOLD;
++ } else if (mode & ATTR_ITALIC) {
++ *font = &dc.ifont;
++ *frcflags = FRC_ITALIC;
++ } else if (mode & ATTR_BOLD) {
++ *font = &dc.bfont;
++ *frcflags = FRC_BOLD;
++ }
++}
++
+ int
+ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len,
int x, int y)
+ {
+@@ -1255,128 +1276,156 @@ xmakeglyphfontspecs(XftGlyphFontSpec *specs, const
Glyph *glyphs, int len, int x
+ FcPattern *fcpattern, *fontpattern;
+ FcFontSet *fcsets[] = { NULL };
+ FcCharSet *fccharset;
+- int i, f, numspecs = 0;
++ int i, f, length = 0, start = 0, numspecs = 0;
++ float cluster_xp = xp, cluster_yp = yp;
++ HbTransformData shaped = { 0 };
++
++ /* Initial values. */
++ mode = prevmode = glyphs[0].mode & ~ATTR_WRAP;
++ xresetfontsettings(mode, &font, &frcflags);
+
+ for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i) {
+- /* Fetch rune and mode for current glyph. */
+- rune = glyphs[i].u;
+- mode = glyphs[i].mode;
++ mode = glyphs[i].mode & ~ATTR_WRAP;
+
+ /* Skip dummy wide-character spacing. */
+- if (mode == ATTR_WDUMMY)
++ if (mode & ATTR_WDUMMY && i < (len - 1))
+ continue;
+
+- /* Determine font for glyph if different from previous glyph. */
+- if (prevmode != mode) {
+- prevmode = mode;
+- font = &dc.font;
+- frcflags = FRC_NORMAL;
+- runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
+- if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD)) {
+- font = &dc.ibfont;
+- frcflags = FRC_ITALICBOLD;
+- } else if (mode & ATTR_ITALIC) {
+- font = &dc.ifont;
+- frcflags = FRC_ITALIC;
+- } else if (mode & ATTR_BOLD) {
+- font = &dc.bfont;
+- frcflags = FRC_BOLD;
++ if (
++ prevmode != mode
++ || ATTRCMP(glyphs[start], glyphs[i])
++ || selected(x + i, y) != selected(x + start, y)
++ || i == (len - 1)
++ ) {
++ /* Handle 1-character wide segments and end of line */
++ length = i - start;
++ if (i == start) {
++ length = 1;
++ } else if (i == (len - 1)) {
++ length = (i - start + 1);
+ }
+- yp = winy + font->ascent;
+- }
+
+- /* Lookup character index with default font. */
+- glyphidx = XftCharIndex(xw.dpy, font->match, rune);
+- if (glyphidx) {
+- specs[numspecs].font = font->match;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+- continue;
+- }
+-
+- /* Fallback on font cache, search the font cache for match. */
+- for (f = 0; f < frclen; f++) {
+- glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
+- /* Everything correct. */
+- if (glyphidx && frc[f].flags == frcflags)
+- break;
+- /* We got a default font for a not found glyph. */
+- if (!glyphidx && frc[f].flags == frcflags
+- && frc[f].unicodep == rune) {
+- break;
++ /* Shape the segment. */
++ hbtransform(&shaped, font->match, glyphs, start,
length);
++ runewidth = win.cw * ((glyphs[start].mode & ATTR_WIDE)
? 2.0f : 1.0f);
++ cluster_xp = xp; cluster_yp = yp;
++ for (int code_idx = 0; code_idx < shaped.count;
code_idx++) {
++ int idx = shaped.glyphs[code_idx].cluster;
++
++ if (glyphs[start + idx].mode & ATTR_WDUMMY)
++ continue;
++
++ /* Advance the drawing cursor if we've moved to
a new cluster */
++ if (code_idx > 0 && idx !=
shaped.glyphs[code_idx - 1].cluster) {
++ xp += runewidth;
++ cluster_xp = xp;
++ cluster_yp = yp;
++ runewidth = win.cw * ((glyphs[start +
idx].mode & ATTR_WIDE) ? 2.0f : 1.0f);
++ }
++
++ if (shaped.glyphs[code_idx].codepoint != 0) {
++ /* If symbol is found, put it into the
specs. */
++ specs[numspecs].font = font->match;
++ specs[numspecs].glyph =
shaped.glyphs[code_idx].codepoint;
++ specs[numspecs].x = cluster_xp +
(short)(shaped.positions[code_idx].x_offset / 64.);
++ specs[numspecs].y = cluster_yp -
(short)(shaped.positions[code_idx].y_offset / 64.);
++ cluster_xp +=
shaped.positions[code_idx].x_advance / 64.;
++ cluster_yp +=
shaped.positions[code_idx].y_advance / 64.;
++ numspecs++;
++ } else {
++ /* If it's not found, try to fetch it
through the font cache. */
++ rune = glyphs[start + idx].u;
++ for (f = 0; f < frclen; f++) {
++ glyphidx = XftCharIndex(xw.dpy,
frc[f].font, rune);
++ /* Everything correct. */
++ if (glyphidx && frc[f].flags ==
frcflags)
++ break;
++ /* We got a default font for a
not found glyph. */
++ if (!glyphidx && frc[f].flags
== frcflags
++ &&
frc[f].unicodep == rune) {
++ break;
++ }
++ }
++
++ /* Nothing was found. Use fontconfig to
find matching font. */
++ if (f >= frclen) {
++ if (!font->set)
++ font->set =
FcFontSort(0, font->pattern,
++
1, 0, &fcres);
++ fcsets[0] = font->set;
++
++ /*
++ * Nothing was found in the
cache. Now use
++ * some dozen of Fontconfig
calls to get the
++ * font for one single
character.
++ *
++ * Xft and fontconfig are
design failures.
++ */
++ fcpattern =
FcPatternDuplicate(font->pattern);
++ fccharset = FcCharSetCreate();
++
++ FcCharSetAddChar(fccharset,
rune);
++ FcPatternAddCharSet(fcpattern,
FC_CHARSET,
++ fccharset);
++ FcPatternAddBool(fcpattern,
FC_SCALABLE, 1);
++
++ FcConfigSubstitute(0, fcpattern,
++ FcMatchPattern);
++ FcDefaultSubstitute(fcpattern);
++
++ fontpattern = FcFontSetMatch(0,
fcsets, 1,
++ fcpattern,
&fcres);
++
++ /* Allocate memory for the new
cache entry. */
++ if (frclen >= frccap) {
++ frccap += 16;
++ frc = xrealloc(frc,
frccap * sizeof(Fontcache));
++ }
++
++ frc[frclen].font =
XftFontOpenPattern(xw.dpy,
++ fontpattern);
++ if (!frc[frclen].font)
++ die("XftFontOpenPattern
failed seeking fallback font: %s
",
++
strerror(errno));
++ frc[frclen].flags = frcflags;
++ frc[frclen].unicodep = rune;
++
++ glyphidx = XftCharIndex(xw.dpy,
frc[frclen].font, rune);
++
++ f = frclen;
++ frclen++;
++
++ FcPatternDestroy(fcpattern);
++ FcCharSetDestroy(fccharset);
++ }
++
++ specs[numspecs].font = frc[f].font;
++ specs[numspecs].glyph = glyphidx;
++ specs[numspecs].x = (short)xp;
++ specs[numspecs].y = (short)yp;
++ numspecs++;
++ }
+ }
+- }
+
+- /* Nothing was found. Use fontconfig to find matching font. */
+- if (f >= frclen) {
+- if (!font->set)
+- font->set = FcFontSort(0, font->pattern,
+- 1, 0, &fcres);
+- fcsets[0] = font->set;
++ /* Cleanup and get ready for next segment. */
++ hbcleanup(&shaped);
++ start = i;
+
+- /*
+- * Nothing was found in the cache. Now use
+- * some dozen of Fontconfig calls to get the
+- * font for one single character.
+- *
+- * Xft and fontconfig are design failures.
+- */
+- fcpattern = FcPatternDuplicate(font->pattern);
+- fccharset = FcCharSetCreate();
+-
+- FcCharSetAddChar(fccharset, rune);
+- FcPatternAddCharSet(fcpattern, FC_CHARSET,
+- fccharset);
+- FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
+-
+- FcConfigSubstitute(0, fcpattern,
+- FcMatchPattern);
+- FcDefaultSubstitute(fcpattern);
+-
+- fontpattern = FcFontSetMatch(0, fcsets, 1,
+- fcpattern, &fcres);
+-
+- /* Allocate memory for the new cache entry. */
+- if (frclen >= frccap) {
+- frccap += 16;
+- frc = xrealloc(frc, frccap * sizeof(Fontcache));
++ /* Determine font for glyph if different from previous
glyph. */
++ if (prevmode != mode) {
++ prevmode = mode;
++ xresetfontsettings(mode, &font, &frcflags);
++ yp = winy + font->ascent;
+ }
+-
+- frc[frclen].font = XftFontOpenPattern(xw.dpy,
+- fontpattern);
+- if (!frc[frclen].font)
+- die("XftFontOpenPattern failed seeking fallback
font: %s
",
+- strerror(errno));
+- frc[frclen].flags = frcflags;
+- frc[frclen].unicodep = rune;
+-
+- glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
+-
+- f = frclen;
+- frclen++;
+-
+- FcPatternDestroy(fcpattern);
+- FcCharSetDestroy(fccharset);
+ }
+-
+- specs[numspecs].font = frc[f].font;
+- specs[numspecs].glyph = glyphidx;
+- specs[numspecs].x = (short)xp;
+- specs[numspecs].y = (short)yp;
+- xp += runewidth;
+- numspecs++;
+ }
+
+ return numspecs;
+ }
+
+ void
+-xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y)
++xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int
x, int y, int charlen)
+ {
+- int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
+ int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
+ width = charlen * win.cw;
+ Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
+@@ -1512,21 +1561,24 @@ void
+ xdrawglyph(Glyph g, int x, int y)
+ {
+ int numspecs;
+- XftGlyphFontSpec spec;
++ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
+- xdrawglyphfontspecs(&spec, g, numspecs, x, y);
++ numspecs = xmakeglyphfontspecs(specs, &g, 1, x, y);
++ xdrawglyphfontspecs(specs, g, numspecs, x, y, (g.mode & ATTR_WIDE) ? 2
: 1);
+ }
+
+ void
+-xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
++xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og, Line line, int
len)
+ {
+ Color drawcol;
+
+ /* remove the old cursor */
+ if (selected(ox, oy))
+ og.mode ^= ATTR_REVERSE;
+- xdrawglyph(og, ox, oy);
++
++ /* Redraw the line where cursor was previously.
++ * It will restore the ligatures broken by the cursor. */
++ xdrawline(line, 0, oy, len);
+
+ if (IS_SET(MODE_HIDE))
+ return;
+@@ -1654,18 +1706,16 @@ xdrawline(Line line, int x1, int y1, int x2)
+ Glyph base, new;
+ XftGlyphFontSpec *specs = xw.specbuf;
+
+- numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
+ i = ox = 0;
+- for (x = x1; x < x2 && i < numspecs; x++) {
++ for (x = x1; x < x2; x++) {
+ new = line[x];
+ if (new.mode == ATTR_WDUMMY)
+ continue;
+ if (selected(x, y1))
+ new.mode ^= ATTR_REVERSE;
+- if (i > 0 && ATTRCMP(base, new)) {
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
+- specs += i;
+- numspecs -= i;
++ if ((i > 0) && ATTRCMP(base, new)) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x -
ox, ox, y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x -
ox);
+ i = 0;
+ }
+ if (i == 0) {
+@@ -1674,8 +1724,10 @@ xdrawline(Line line, int x1, int y1, int x2)
+ }
+ i++;
+ }
+- if (i > 0)
+- xdrawglyphfontspecs(specs, base, i, ox, y1);
++ if (i > 0) {
++ numspecs = xmakeglyphfontspecs(specs, &line[ox], x2 - ox, ox,
y1);
++ xdrawglyphfontspecs(specs, base, numspecs, ox, y1, x2 - ox);
++ }
+ }
+
+ void
diff --git a/st.suckless.org/patches/ligatures/index.md
b/st.suckless.org/patches/ligatures/index.md
index 1c3a64d9..3734a433 100644
--- a/st.suckless.org/patches/ligatures/index.md
+++ b/st.suckless.org/patches/ligatures/index.md
@@ -27,6 +27,15 @@ Boxdraw
Download
--------
+**0.9.2**:
+* [st-ligatures-0.9.2](0.9.2/st-ligatures-20240427-0.9.2.diff)
+*
[st-ligatures-scrollback-0.9.2](0.9.2/st-ligatures-scrollback-20240427-0.9.2.diff)
+*
[st-ligatures-scrollback-ringbuffer-0.9.2](0.9.2/st-ligatures-scrollback-ringbuffer-20240427-0.9.2.diff)
+* [st-ligatures-alpha-0.9.2](0.9.2/st-ligatures-alpha-20240427-0.9.2.diff)
+*
[st-ligatures-alpha-scrollback-0.9.2](0.9.2/st-ligatures-alpha-scrollback-20240427-0.9.2.diff)
+*
[st-ligatures-alpha-scrollback-ringbuffer-0.9.2](0.9.2/st-ligatures-alpha-scrollback-ringbuffer-20240427-0.9.2.diff)
+* [st-ligatures-boxdraw-0.9.2](0.9.2/st-ligatures-boxdraw-20240427-0.9.2.diff)
+
**0.9**:
* [st-ligatures-0.9](0.9/st-ligatures-20240105-0.9.diff)
* [st-ligatures-scrollback-0.9](0.9/st-ligatures-scrollback-20240105-0.9.diff)
