branch: elpa/haskell-tng-mode
commit bf24329f03f8c90b4118cb768c417a3485372dab
Author: Tseen She <ts33n....@gmail.com>
Commit: Tseen She <ts33n....@gmail.com>
going nova
---
.gitignore | 3 +
COPYING | 674 +++++++++++++++++++++++++++++++++++++++++++++++
Cask | 30 +++
README.md | 87 ++++++
haskell-tng-font-lock.el | 85 ++++++
haskell-tng-mode.el | 63 +++++
haskell-tng-syntax.el | 96 +++++++
7 files changed, 1038 insertions(+)
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ed55a4c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.elc
+.cask
+*-pkg.el
diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
+ GNU GENERAL PUBLIC LICENSE
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+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Cask b/Cask
new file mode 100644
index 0000000..26fb0f0
--- /dev/null
+++ b/Cask
@@ -0,0 +1,30 @@
+;;-*- Mode: Lisp -*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;;; Commentary:
+;;
+;; See http://cask.readthedocs.org for information about Cask.
+;;
+;; cask pkg-file
+;;
+;; cask update
+;; cask install
+;;
+;; are particularly useful commands.
+;;
+;; To run the tests:
+;; cask exec ert-runner
+;;
+;;; Code:
+
+(source melpa-stable)
+
+(package-file "haskell-tng-mode.el")
+
+(development
+ (depends-on "ert-runner")
+ (depends-on "undercover"))
+
+;;; Cask ends here
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..ad3fc08
--- /dev/null
+++ b/README.md
@@ -0,0 +1,87 @@
+# Haskell Mode: The Next Generation
+
+This is an exploratory alternative to
[`haskell-mode`](https://github.com/haskell/haskell-mode/) that answers the
question
+
+> How would we support Haskell in GNU Emacs if we started today?
+
+## Why?
+
+`haskell-mode` is almost 30 years old and has accumulated more than 25,000
lines of code. Nobody wants to maintain that.
+
+The GNU Emacs ecosystem has evolved to provide many features that
`haskell-mode` independently implemented, such as
[`projectile`](https://github.com/bbatsov/projectile),
[`comint-mode`](https://masteringemacs.org/article/comint-writing-command-interpreter),
[`highlight-symbol`](https://melpa.org/##/highlight-symbol),
[`company-mode`](http://company-mode.github.io),
[`yasnippet`](http://joaotavora.github.io/yasnippet/),
[`polymode`](https://github.com/polymode/polymode), [`smartparens`]( [...]
+
+## Approach
+
+The goal of this friendly fork is to produce software that any Haskell
developer can use, understand and build upon ([Emacs
Lisp](https://www.gnu.org/software/emacs/manual/elisp.html) is fun to learn).
+
+This can be achieved by preferring a simple and small codebase targeting
[Haskell2010](https://www.haskell.org/onlinereport/haskell2010/), with
automated tests for every feature.
+
+Old versions of `ghc` and extensions to the Haskell language may not be
supported, to reduce the complexity of the codebase. For example, [literate
Haskell](https://wiki.haskell.org/Literate_programming) will not be supported,
and `ghc` language extensions must be justified on a per-case basis.
+
+If it is possible to implement a feature using another minor mode, or command
line tool, then we would prefer not to accept the feature.
+
+## Issue Tracker
+
+Bug reports and feature requests are a source of anxiety for maintainers, and
encourage an unhealthy customer / supplier relationship between users and
contributors.
+
+Instead, and following the [anarchical spirit of
Haskell](https://www.microsoft.com/en-us/research/wp-content/uploads/2016/07/history.pdf),
we encourage discussions and debate around code contributions. Merge requests
can be raised by anybody and discussed by anybody. If the maintainers are
convinced by the technical merit and quality of a proposal, they may accept it.
+
+## Install
+
+Check out the source code repository, type `cask build`, and add to your load
path:
+
+```lisp
+(add-to-list 'load-path (expand-file-name "~/Projects/haskell-mode"))
+(require 'haskell-mode-autoloads)
+```
+
+There are no plans to distribute any other way: this encourages contributor
engagement.
+
+## Plan
+
+This is the status of core features:
+
+- Navigation:
+ - [x] performance-minded `syntax-table`
+ - [ ] `font-lock` to visually distinguish types and values
+ - [ ] `sexp` navigation (SMIE)
+ - [ ] `projectile` / [`fast-tags`](https://github.com/elaforge/fast-tags)
integration for `TAGS`
+ - [ ] hoogle CLI jump-to-source
+ - [ ] `imenu` population
+- Editing:
+ - [ ] indentation (SMIE)
+ - [ ] `abbrev` table
+ - [ ] `yasnippet` templates
+ - [ ] `smartparens` compatibility (or something from stdlib)
+ - [ ] `LANGUAGE` management
+ - [ ] `import` management
+- Compiling:
+ - [ ] `haskell-compile` for build tool agnostic interaction with `ghc`
+ - [ ] `comint-mode` based `ghc` repl
+
+Compatibility with `lsp-mode` /
[`haskell-ide-engine`](https://github.com/haskell/haskell-ide-engine) is
important for more advanced IDE features.
+
+## Future Plans
+
+Some blue sky features are being considered but may be best as independent
projects:
+
+- `.cabal` editing / navigation
+- [`.hie`](https://ghc.haskell.org/trac/ghc/wiki/HIEFiles) files as a parser
backend and many type based queries.
+- lightweight interactive commands ([`dante`](https://github.com/jyp/dante) /
[`intero`](https://github.com/commercialhaskell/intero)) (or perhaps redundant
with `.hie`).
+ - `:type` at point
+ - `:browse` `company-backend`
+ - `:doc` at point
+- [`flycheck`](http://www.flycheck.org/en/latest/) integration with
`haskell-compile`
+ - and [`hlint`](https://github.com/ndmitchell/hlint)
+ - and for faster feedback, [`ghcid`](https://github.com/ndmitchell/ghcid)
+- [visualise values as
types](https://twitter.com/jyothsnasrin/status/1039530556080283648)
+- [`djinn`](https://hackage.haskell.org/package/djinn) /
[`justdoit`](https://hackage.haskell.org/package/ghc-justdoit) integration
+- is there a solution to thinking "right to left" vs writing "left to right"?
+- identify trivial / helper functions and forward their `edit-definition` to
another location.
+- Code gen
+ - two spaces after an `import` converts to the missing `qualified` (or is
this indentation?)
+ - `instance` boilerplate
+- Refactoring
+ - be compatible with
[`apply-refact`](https://github.com/mpickering/apply-refact) /
[`hlint-refactor-mode`](https://github.com/mpickering/hlint-refactor-mode)
+ - convert wildcard import to explicit list
+ - insert explicit list of exports
diff --git a/haskell-tng-font-lock.el b/haskell-tng-font-lock.el
new file mode 100644
index 0000000..308da8c
--- /dev/null
+++ b/haskell-tng-font-lock.el
@@ -0,0 +1,85 @@
+;;; haskell-tng-font-lock.el --- Fontification for Haskell -*-
lexical-binding: t -*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;;; Commentary:
+;;
+;; A fontification scheme for Haskell with a goal to visually differentiate
+;; between values and types, requiring multi-line analysis.
+;;
+;; The detection of complex language constructs is not considered, for
+;; simplicity and speed. Maybe one day we could use
+;; https://github.com/tree-sitter/tree-sitter-haskell for 100% accurate
+;; parsing, but until that day, we do it the idiomatic Emacs way (with hacks
+;; and more hacks).
+;;
+;;
https://www.gnu.org/software/emacs/manual/html_mono/elisp.html#Font-Lock-Mode
+;;
+;;; Code:
+
+(defgroup haskell-tng-font-lock:faces nil
+ "Haskell font faces."
+ :group 'haskell-tng)
+
+(defface haskell-tng-font-lock:keyword
+ '((t :inherit font-lock-keyword-face))
+ "Haskell reserved names and operators."
+ :group 'haskell-tng-font-lock:faces)
+
+(defface haskell-tng-font-lock:package
+ '((t :inherit font-lock-variable-name-face :weight bold))
+ "Haskell packages."
+ :group 'haskell-tng-font-lock:faces)
+
+(defface haskell-tng-font-lock:type
+ '((t :inherit font-lock-type-face))
+ "Haskell types."
+ :group 'haskell-tng-font-lock:faces)
+
+(defface haskell-tng-font-lock:constructor
+ '((t :inherit font-lock-constant-face))
+ "Haskell constructors."
+ :group 'haskell-tng-font-lock:faces)
+
+;; TODO: types (signatures, classes and imports)
+;;
+;; TODO: pragmas
+;;
+;; TODO: numeric / char primitives?
+
+;; FIXME: consider using rx instead of regexes... there are a lot of escapes
+;; that obfuscate the meaning, plus we could use DRY.
+
+(setq
+ haskell-tng-font-lock:keywords
+ `((,(regexp-opt '("case" "class" "data" "default" "deriving" "do" "else"
+ "foreign" "if" "import" "in" "infix" "infixl"
+ "infixr" "instance" "let" "module" "newtype" "of"
+ "then" "type" "where" "_")
+ 'words)
+ . 'haskell-tng-font-lock:keyword) ;; reservedid
+ (,(regexp-opt '(".." ":" "::" "=" "|" "<-" ">" "->" "@" "~" "=>")
+ 'symbols)
+ . 'haskell-tng-font-lock:keyword) ;; reservedop
+ ;; lambda syntax may be followed by a trailing symbol
+ ("\\_<\\(\\\\\\)" . 'haskell-tng-font-lock:keyword)
+
+ ;; TODO: contextual / multiline support for the import region.
+ ;; qualified/hiding/as are keywords when used in imports
+ ("\\_<import\\_>[[:space:]]+\\_<\\(qualified\\)\\_>" 1
'haskell-tng-font-lock:keyword)
+ ("\\_<import\\_>[^(]+?\\_<\\(hiding\\|as\\)\\_>" 1
'haskell-tng-font-lock:keyword)
+
("\\_<import\\_>\\(?:[[:space:]]\\|qualified\\)+\\_<\\([[:upper:]]\\(?:\\.\\|\\w\\)*\\)\\_>"
+ 1 'haskell-tng-font-lock:package)
+ ("\\_<import\\_>[^(]+?\\_<as[[:space:]]+\\([[:upper:]]\\w+\\)"
+ 1 'haskell-tng-font-lock:package)
+
+ ("\\_<\\(\\(?:[[:upper:]]\\w*\\.\\)+\\)"
+ . 'haskell-tng-font-lock:package) ;; uses of F.Q.N.s
+
+ ("\\_<\\([[:upper:]]\\w*\\)\\_>" 0 'haskell-tng-font-lock:constructor) ;;
conid
+ ("\\_<\\(:\\s_+\\)\\_>" 0 'haskell-tng-font-lock:constructor) ;; consym
+ ))
+
+(provide 'haskell-tng-font-lock)
+;;; haskell-tng-font-lock.el ends here
diff --git a/haskell-tng-mode.el b/haskell-tng-mode.el
new file mode 100644
index 0000000..cf9bdee
--- /dev/null
+++ b/haskell-tng-mode.el
@@ -0,0 +1,63 @@
+;;; haskell-tng-mode.el --- Major mode for editing Haskell -*-
lexical-binding: t -*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;; Homepage: https://gitlab.com/tseenshe/haskell-tng-mode
+;; Keywords: languages
+;; Package-Version: 0.0.1
+;; Package-Requires: ((dash "2.14.1"))
+
+;;; Commentary:
+;;
+;; A modern rewrite of `haskell-mode'.
+;;
+;;; Code:
+
+(require 'dabbrev)
+(require 'haskell-tng-syntax)
+(require 'haskell-tng-font-lock)
+
+;;;###autoload
+(define-derived-mode haskell-tng-mode prog-mode "Hask"
+ "Major mode for editing Haskell programs."
+ :group 'haskell-tng
+ :syntax-table haskell-tng-syntax:table
+
+ ;; TODO paragraph-start, paragraph-separate, fill-paragraph-function
+ ;;
+ ;; TODO comment-start, comment-padding, comment-start-skip, comment-end,
+ ;; comment-end-skip, comment-auto-fill-only-comments,
parse-sexp-ignore-comments
+ ;;
+ ;; (it is annoying that we specify comments here AND in the syntax table)
+
+ (setq
+ ;; TAB is evil
+ indent-tabs-mode nil
+
+ ;; case-sensitive language
+ dabbrev-case-fold-search nil
+ dabbrev-case-distinction nil
+ dabbrev-case-replace nil
+
+ words-include-escapes t
+ syntax-propertize-function #'haskell-tng-syntax:propertize
+ parse-sexp-lookup-properties t
+
+ font-lock-defaults '(haskell-tng-font-lock:keywords
+ nil nil nil)
+
+ ;; whitespace is meaningful, no electric indentation
+ electric-indent-inhibit t))
+
+(defcustom haskell-tng-mode-hook nil
+ "List of functions to run after `haskell-tng-mode' is enabled."
+ :group 'haskell-tng
+ :type 'hook)
+
+;; (progn
+;; (add-to-list 'auto-mode-alist '("\\.hs\\'" . haskell-tng-mode))
+;; (modify-coding-system-alist 'file "\\.hs\\'" 'utf-8))
+
+(provide 'haskell-tng-mode)
+;;; haskell-tng-mode.el ends here
diff --git a/haskell-tng-syntax.el b/haskell-tng-syntax.el
new file mode 100644
index 0000000..fbb9d17
--- /dev/null
+++ b/haskell-tng-syntax.el
@@ -0,0 +1,96 @@
+;;; haskell-tng-syntax.el --- Syntax Table for Haskell -*- lexical-binding: t
-*-
+
+;; Copyright (C) 2018 Tseen She
+;; License: GPL 3 or any later version
+
+;;; Commentary:
+;;
+;; A grossly simplified description of the Haskell language providing fast
+;; editor commands and visual feedback. Defer advanced analysis to later
stages
+;; such as font-lock and SMIE lexing / parsing, where it is needed.
+;;
+;;
https://www.gnu.org/software/emacs/manual/html_mono/elisp.html#Syntax-Tables
+;;
+;;; Code:
+
+(require 'dash)
+
+(defvar haskell-tng-syntax:table
+ (let ((table (make-syntax-table)))
+ (map-char-table
+ #'(lambda (k v)
+ ;; reset the (surprisingly numerous) defaults
+ (let ((class (syntax-class v)))
+ (when (-contains? '(1 4 5 6 9) class)
+ (modify-syntax-entry k "_" table))))
+ (char-table-parent table))
+
+ ;; many of the following chars are already defined by the defaults, but we
+ ;; repeat them (at least ASCII) to explicitly match Haskell2010 section
2.2.
+ ;; Chars that appear in multiple classes are only assigned to the final
+ ;; class they are given.
+
+ ;; whitechar
+ (--each (string-to-list "\r\n\f\v \t")
+ (modify-syntax-entry it " " table))
+
+ ;; ascSymbol
+ (--each (string-to-list "!#$%&*+./<=>?@\\^|-~:")
+ (modify-syntax-entry it "_" table))
+
+ ;; small (underscore is a lowercase letter)
+ (modify-syntax-entry ?_ "w" table)
+
+ ;; some special (treated like punctuation)
+ (--each (string-to-list ",;")
+ (modify-syntax-entry it "." table))
+
+ ;; apostrophe as a symbol, not delimiter
+ (modify-syntax-entry ?\' "_" table)
+
+ ;; string delimiter
+ (modify-syntax-entry ?\" "\"" table)
+
+ ;; parens and pairs (infix functions)
+ (modify-syntax-entry ?\( "()" table)
+ (modify-syntax-entry ?\) ")(" table)
+ (modify-syntax-entry ?\[ "(]" table)
+ (modify-syntax-entry ?\] ")[" table)
+ (modify-syntax-entry ?\` "$`" table)
+
+ ;; comments (subsuming pragmas)
+ (modify-syntax-entry ?\{ "(}1nb" table)
+ (modify-syntax-entry ?\} "){4nb" table)
+ (modify-syntax-entry ?- "_ 123" table)
+ (--each (string-to-list "\r\n\f\v")
+ (modify-syntax-entry it ">" table))
+
+ table)
+ "Haskell syntax table.")
+
+(defun haskell-tng-syntax:propertize (start end)
+ "For some context-sensitive syntax entries."
+ (haskell-tng-syntax:propertize-char-delims start end)
+ (haskell-tng-syntax:propertize-escapes start end))
+
+(defun haskell-tng-syntax:propertize-char-delims (start end)
+ "Matching apostrophes are string delimiters (literal chars)."
+ (save-excursion
+ (goto-char start)
+ (while (re-search-forward "'\\\\?.'" end t)
+ (let ((open (match-beginning 0))
+ (close (- (point) 1)))
+ (put-text-property open (1+ open) 'syntax-table '(7 . ?\'))
+ (put-text-property close (1+ close) 'syntax-table '(7 . ?\'))))))
+
+(defun haskell-tng-syntax:propertize-escapes (start end)
+ "Backslash inside String is an escape character."
+ (save-excursion
+ (goto-char start)
+ (while (re-search-forward "\\\\" end t)
+ (when (nth 3 (syntax-ppss))
+ (put-text-property (- (point) 1) (point)
+ 'syntax-table '(9 . ?\\))))))
+
+(provide 'haskell-tng-syntax)
+;;; haskell-tng-syntax.el ends here
