Package: ed
Version: 0.7-1
Severity: wishlist
Tags: patch
Hi,
Plan9's ed has a browse, which can be used to browse the file `page by
page'. The document about it is:
(.)b[+-][pagesize][pln]
Browse. Print a `page', normally 20 lines. The optional (default) or
specifies whether the next or previous page is to be printed. The
optional pagesize is the number of lines in a page. The optional or
causes printing in the specified format, initially Pagesize and format
are remembered between commands. Dot is left at the last line
displayed.
Obviously, it is a very convenient feature. (GNU ed claims that
``Prints the addressed lines. If invoked from a terminal, ed
pauses at the end of each page until a newline is entered. The
current address is set to the last line printed.'' But I don't know
how to use it, unfortunately.)
As an initial try, I modified the source file `main_loop.c', based on
GNU ed version 0.9, and basically implement it. The patch is attached
below:
--- ed-0.9/main_loop.c 2008-01-24 02:11:32.000000000 +0800
+++ ed-0.9-hzwang-0.1/main_loop.c 2008-03-21 02:37:13.000000000 +0800
@@ -390,6 +390,11 @@
int status = 0;
int addr, c, n;
+ static int pagesize = 20;
+ char direction = '+';
+ static int bflags = 0;
+ char ch;
+
const int addr_cnt = extract_addr_range(); if( addr_cnt < 0 ) return ERR;
ibufp = skip_blanks( ibufp );
c = *ibufp++;
@@ -488,6 +493,51 @@
return ERR;
gflags = 0;
break;
+ case 'b': ch = *ibufp++;
+ if (ch == '-' || ch == '+')
+ {
+ direction = ch;
+ ch = *ibufp++;
+ }
+ if (isdigit (ch))
+ pagesize = 0;
+ while (isdigit (ch))
+ {
+ pagesize = atoi (&ch) + pagesize * 10;
+ ch = *ibufp++;
+ }
+ if (ch == 'l')
+ bflags = GLS;
+ else if (ch == 'n')
+ bflags = GNP;
+ else if (ch == 'p')
+ bflags = GPR;
+ else if (ch == '\n')
+ ;
+ else
+ {
+ set_error_msg ("Invalid command suffix");
+ return ERR;
+ }
+ if (second_addr < 0 || second_addr > last_addr ())
+ {
+ invalid_address ();
+ return ERR;
+ }
+ if (direction == '+')
+ {
+ first_addr = second_addr;
+ second_addr = second_addr + pagesize > last_addr ()
+ ? last_addr () : second_addr + pagesize;
+ }
+ else
+ {
+ first_addr = second_addr - pagesize > 0
+ ? second_addr - pagesize : 1;
+ }
+ if (!display_lines (first_addr, second_addr, bflags))
+ return ERR;
+ break;
case 'm': if( !check_addr_range( -1, -1, addr_cnt ) ||
!get_third_addr( &addr ) ) return ERR;
if( addr >= first_addr && addr < second_addr )
Thanks.
-- System Information:
Debian Release: lenny/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.24-1-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages ed depends on:
ii libc6 2.7-9 GNU C Library: Shared libraries
ed recommends no packages.
-- no debconf information
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