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;;; haskell-mode.el --- A Haskell editing mode -*- coding: utf-8; lexical-binding: t -*-
;; Copyright © 2003, 2004, 2005, 2006, 2007, 2008, 2016
;; Free Software Foundation, Inc
;; Copyright © 1992, 1997-1998 Simon Marlow, Graeme E Moss, and Tommy Thorn
;; Author: 1992 Simon Marlow
;; 1997-1998 Graeme E Moss <gem@cs.york.ac.uk> and
;; Tommy Thorn <thorn@irisa.fr>,
;; 2001-2002 Reuben Thomas (>=v1.4)
;; 2003 Dave Love <fx@gnu.org>
;; 2016 Arthur Fayzrakhmanov
;; Keywords: faces files Haskell
;; Version: 16.2-git
;; URL: https://github.com/haskell/haskell-mode
;; This file is not part of GNU Emacs.
;; This file 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, or (at your option)
;; any later version.
;; This file 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/>.
;;; Commentary:
;; A major mode for editing Haskell (the functional programming
;; language, see URL `http://www.haskell.org') in Emacs.
;;
;; Some of its major features include:
;;
;; - syntax highlighting (font lock),
;;
;; - automatic indentation,
;;
;; - on-the-fly documentation,
;;
;; - interaction with inferior GHCi/Hugs instance,
;;
;; - scans declarations and places them in a menu.
;;
;; See URL `https://github.com/haskell/haskell-mode' and/or
;; Info node `(haskell-mode)Introduction' for more information.
;;
;; Use `M-x haskell-mode-view-news` (after Haskell Mode is installed)
;; to show information on recent changes in Haskell Mode.
;;; Change Log:
;; This mode is based on an editing mode by Simon Marlow 11/1/92
;; and heavily modified by Graeme E Moss and Tommy Thorn 7/11/98.
;;
;; Version 1.5:
;; Added autoload for haskell-indentation
;;
;; Version 1.43:
;; Various tweaks to doc strings and customization support from
;; Ville Skyttä <scop@xemacs.org>.
;;
;; Version 1.42:
;; Added autoload for GHCi inferior mode (thanks to Scott
;; Williams for the bug report and fix).
;;
;; Version 1.41:
;; Improved packaging, and made a couple more variables
;; interactively settable.
;;
;; Version 1.4:
;; Added GHCi mode from Chris Webb, and tidied up a little.
;;
;; Version 1.3:
;; The literate or non-literate style of a buffer is now indicated
;; by just the variable haskell-literate: nil, `bird', or `tex'.
;; For literate buffers with ambiguous style, the value of
;; haskell-literate-default is used.
;;
;; Version 1.2:
;; Separated off font locking, declaration scanning and simple
;; indentation, and made them separate modules. Modules can be
;; added easily now. Support for modules haskell-doc,
;; haskell-indent, and haskell-hugs. Literate and non-literate
;; modes integrated into one mode, and literate buffer indicated by
;; value of haskell-literate(-bird-style).
;;
;; Version 1.1:
;; Added support for declaration scanning under XEmacs via
;; func-menu. Moved operators to level two fontification.
;;
;; Version 1.0:
;; Added a nice indention support from Heribert Schuetz
;; <Heribert.Schuetz@informatik.uni-muenchen.de>:
;;
;; I have just hacked an Emacs Lisp function which you might prefer
;; to `indent-relative' in haskell-mode.el. See below. It is not
;; really Haskell-specific because it does not take into account
;; keywords like `do', `of', and `let' (where the layout rule
;; applies), but I already find it useful.
;;
;; Cleaned up the imenu support. Added support for literate scripts.
;;
;; Version 0.103 [HWL]:
;; From Hans Wolfgang Loidl <hwloidl@dcs.gla.ac.uk>:
;;
;; I (HWL) added imenu support by copying the appropriate functions
;; from hugs-mode. A menu-bar item "Declarations" is now added in
;; haskell mode. The new code, however, needs some clean-up.
;;
;; Version 0.102:
;;
;; Moved C-c C-c key binding to comment-region. Leave M-g M-g to do
;; the work. comment-start-skip is changed to comply with comment-start.
;;
;; Version 0.101:
;;
;; Altered indent-line-function to indent-relative.
;;
;; Version 0.100:
;;
;; First official release.
;;; Code:
(require 'haskell-customize)
(require 'ansi-color)
(require 'dabbrev)
(require 'compile)
(require 'etags)
(require 'flymake)
(require 'outline)
(require 'cl-lib)
(require 'haskell-ghc-support)
(require 'haskell-complete-module)
(require 'haskell-compat)
(require 'haskell-align-imports)
(require 'haskell-lexeme)
(require 'haskell-sort-imports)
(require 'haskell-string)
(require 'haskell-indentation)
(require 'haskell-font-lock)
(require 'haskell-cabal)
;; All functions/variables start with `(literate-)haskell-'.
;; Version of mode.
(defconst haskell-version "16.2-git"
"The release version of `haskell-mode'.")
;;;###autoload
(defun haskell-version (&optional here)
"Show the `haskell-mode` version in the echo area.
With prefix argument HERE, insert it at point."
(interactive "P")
(let* ((haskell-mode-dir (ignore-errors
(file-name-directory (or (locate-library "haskell-mode") ""))))
(version (format "haskell-mode version %s (%s)"
haskell-version
haskell-mode-dir)))
(if here
(insert version)
(message "%s" version))))
;;;###autoload
(defun haskell-mode-view-news ()
"Display information on recent changes to haskell-mode."
(interactive)
(with-current-buffer (find-file-read-only (expand-file-name "NEWS" haskell-mode-pkg-base-dir))
(goto-char (point-min))
(outline-hide-sublevels 1)
(outline-next-visible-heading 1)
(outline-show-subtree)))
;; Are we looking at a literate script?
(defvar-local haskell-literate nil
"If not nil, the current buffer contains a literate Haskell script.
Possible values are: `bird' and `tex', for Bird-style and LaTeX-style
literate scripts respectively. Set by `haskell-mode' and
`literate-haskell-mode'. For an ambiguous literate buffer -- i.e. does
not contain either \"\\begin{code}\" or \"\\end{code}\" on a line on
its own, nor does it contain \">\" at the start of a line -- the value
of `haskell-literate-default' is used.")
(put 'haskell-literate 'safe-local-variable 'symbolp)
;; Default literate style for ambiguous literate buffers.
(defcustom haskell-literate-default 'bird
"Default value for `haskell-literate'.
Used if the style of a literate buffer is ambiguous. This variable should
be set to the preferred literate style."
:group 'haskell
:type '(choice (const bird) (const tex) (const nil)))
(defvar haskell-mode-map
(let ((map (make-sparse-keymap)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Editing-specific commands
(define-key map (kbd "C-c C-,") 'haskell-mode-format-imports)
(define-key map [remap delete-indentation] 'haskell-delete-indentation)
(define-key map (kbd "C-c C-l") 'haskell-mode-enable-process-minor-mode)
(define-key map (kbd "C-c C-b") 'haskell-mode-enable-process-minor-mode)
(define-key map (kbd "C-c C-v") 'haskell-mode-enable-process-minor-mode)
(define-key map (kbd "C-c C-t") 'haskell-mode-enable-process-minor-mode)
(define-key map (kbd "C-c C-i") 'haskell-mode-enable-process-minor-mode)
(define-key map (kbd "C-c C-s") 'haskell-mode-toggle-scc-at-point)
map)
"Keymap used in `haskell-mode'.")
(defun haskell-mode-enable-process-minor-mode ()
"Tell the user to choose a minor mode for process interaction."
(interactive)
(error "Run `C-h f haskell-mode` for instruction how to setup a Haskell interaction mode."))
(easy-menu-define haskell-mode-menu haskell-mode-map
"Menu for the Haskell major mode."
;; Suggestions from Pupeno <pupeno@pupeno.com>:
;; - choose the underlying interpreter
;; - look up docs
`("Haskell"
["Indent line" indent-according-to-mode]
["(Un)Comment region" comment-region mark-active]
"---"
["Start interpreter" haskell-interactive-switch]
["Load file" haskell-process-load-file]
"---"
["Load tidy core" ghc-core-create-core]
"---"
,(if (default-boundp 'eldoc-documentation-function)
["Doc mode" eldoc-mode
:style toggle :selected (bound-and-true-p eldoc-mode)]
["Doc mode" haskell-doc-mode
:style toggle :selected (and (boundp 'haskell-doc-mode) haskell-doc-mode)])
["Customize" (customize-group 'haskell)]
))
;; Procedurally generated (see Lexeme.hs in ghc).
;; This is a bit unsightly: it's generated by making a list of all
;; unicode characters whose Unicode general category ghc would
;; recognize as valid symbol (or identifier, below) constituent.
(defvar haskell--char-syntax-symbols
'((161 . 169) 172 (174 . 177) 180 (182 . 184) 191 215 247
(706 . 709) (722 . 735) (741 . 747) 749 (751 . 767) 885
894 (900 . 901) 903 1014 1154 (1370 . 1375) (1417 . 1418)
(1421 . 1423) 1470 1472 1475 1478 (1523 . 1524) (1542 . 1551)
1563 (1566 . 1567) (1642 . 1645) 1748 1758 1769 (1789 . 1790)
(1792 . 1805) (2038 . 2041) (2096 . 2110) 2142 (2404 . 2405)
2416 (2546 . 2547) (2554 . 2555) (2800 . 2801) 2928
(3059 . 3066) 3199 3449 3572 3647 3663 (3674 . 3675)
(3841 . 3863) (3866 . 3871) 3892 3894 3896 3973 (4030 . 4037)
(4039 . 4044) (4046 . 4058) (4170 . 4175) (4254 . 4255)
4347 (4960 . 4968) (5008 . 5017) 5120 (5741 . 5742)
(5867 . 5869) (5941 . 5942) (6100 . 6102) (6104 . 6107)
(6144 . 6154) 6464 (6468 . 6469) (6622 . 6623) (6624 . 6655)
(6686 . 6687) (6816 . 6822) (6824 . 6829) (7002 . 7018)
(7028 . 7036) (7164 . 7167) (7227 . 7231) (7294 . 7295)
(7360 . 7367) 7379 8125 (8127 . 8129) (8141 . 8143)
(8157 . 8159) (8173 . 8175) (8189 . 8190) (8208 . 8215)
(8224 . 8231) (8240 . 8248) (8251 . 8260) (8263 . 8286)
(8314 . 8316) (8330 . 8332) (8352 . 8381) (8448 . 8449)
(8451 . 8454) (8456 . 8457) 8468 (8470 . 8472) (8478 . 8483)
8485 8487 8489 8494 (8506 . 8507) (8512 . 8516) (8522 . 8525)
8527 (8592 . 8703) (8704 . 8959) (8960 . 8967) (8972 . 9000)
(9003 . 9210) (9216 . 9254) (9280 . 9290) (9372 . 9449)
(9472 . 9599) (9600 . 9631) (9632 . 9727) (9728 . 9983)
(9984 . 10087) (10132 . 10175) (10176 . 10180) (10183 . 10213)
(10224 . 10239) (10240 . 10495) (10496 . 10623) (10624 . 10626)
(10649 . 10711) (10716 . 10747) (10750 . 10751) (10752 . 11007)
(11008 . 11123) (11126 . 11157) (11160 . 11193) (11197 . 11208)
(11210 . 11217) (11493 . 11498) (11513 . 11516) (11518 . 11519)
11632 (11776 . 11777) (11782 . 11784) 11787 (11790 . 11803)
(11806 . 11807) (11818 . 11822) (11824 . 11841) (11904 . 11929)
(11931 . 12019) (12032 . 12245) (12272 . 12283) (12289 . 12292)
(12306 . 12307) 12316 12320 12336 (12342 . 12343)
(12349 . 12351) (12443 . 12444) 12448 12539 (12688 . 12689)
(12694 . 12703) (12736 . 12771) (12800 . 12830) (12842 . 12871)
12880 (12896 . 12927) (12938 . 12976) (12992 . 13054)
(13056 . 13311) (19904 . 19967) (42128 . 42182) (42238 . 42239)
(42509 . 42511) 42611 42622 (42738 . 42743) (42752 . 42774)
(42784 . 42785) (42889 . 42890) (43048 . 43051) (43062 . 43065)
(43124 . 43127) (43214 . 43215) (43256 . 43258) (43310 . 43311)
43359 (43457 . 43469) (43486 . 43487) (43612 . 43615)
(43639 . 43641) (43742 . 43743) (43760 . 43761) 43867
44011 64297 (64434 . 64449) (65020 . 65021) (65040 . 65046)
65049 (65072 . 65076) (65093 . 65094) (65097 . 65103)
(65104 . 65106) (65108 . 65112) (65119 . 65126) (65128 . 65131)
(65281 . 65287) (65290 . 65295) (65306 . 65312) 65340
(65342 . 65344) 65372 65374 65377 (65380 . 65381)
(65504 . 65510) (65512 . 65518) (65532 . 65533) (65792 . 65794)
(65847 . 65855) (65913 . 65929) 65932 (65936 . 65947)
65952 (66000 . 66044) 66463 66512 66927 67671 (67703 . 67704)
67871 67903 (68176 . 68184) 68223 68296 (68336 . 68342)
(68409 . 68415) (68505 . 68508) (69703 . 69709) (69819 . 69820)
(69822 . 69825) (69952 . 69955) (70004 . 70005) (70085 . 70088)
70093 (70200 . 70205) 70854 (71105 . 71113) (71233 . 71235)
(74864 . 74868) (92782 . 92783) 92917 (92983 . 92991)
(92996 . 92997) 113820 113823 (118784 . 119029) (119040 . 119078)
(119081 . 119140) (119146 . 119148) (119171 . 119172)
(119180 . 119209) (119214 . 119261) (119296 . 119361)
119365 (119552 . 119638) 120513 120539 120571 120597
120629 120655 120687 120713 120745 120771 (126704 . 126705)
(126976 . 127019) (127024 . 127123) (127136 . 127150)
(127153 . 127167) (127169 . 127183) (127185 . 127221)
(127248 . 127278) (127280 . 127339) (127344 . 127386)
(127462 . 127487) (127488 . 127490) (127504 . 127546)
(127552 . 127560) (127568 . 127569) (127744 . 127788)
(127792 . 127869) (127872 . 127950) (127956 . 127991)
(128000 . 128254) (128256 . 128330) (128336 . 128377)
(128379 . 128419) (128421 . 128511) (128512 . 128578)
(128581 . 128591) (128592 . 128639) (128640 . 128719)
(128736 . 128748) (128752 . 128755) (128768 . 128883)
(128896 . 128980) (129024 . 129035) (129040 . 129095)
(129104 . 129113) (129120 . 129159) (129168 . 129197)))
(defvar haskell--char-syntax-identifiers
'(170
(178 . 179) 181 (185 . 186) (188 . 190) (192 . 214) (216 . 246)
(248 . 255) (256 . 383) (384 . 591) (592 . 687) (880 . 883)
(886 . 887) (891 . 893) 895 902 (904 . 906) 908 (910 . 929) (931 . 1013)
(1015 . 1023) (1024 . 1153) (1162 . 1279) (1280 . 1327)
(1329 . 1366) (1377 . 1415) (1488 . 1514) (1520 . 1522) (1568 . 1599)
(1601 . 1610) (1632 . 1641) (1646 . 1647) (1649 . 1747) 1749
(1774 . 1788) 1791 1808 (1810 . 1839) (1869 . 1871) (1872 . 1919)
(1920 . 1957) 1969 (1984 . 2026) (2048 . 2069) (2112 . 2136) (2208 . 2226)
(2308 . 2361) 2365 2384 (2392 . 2401) (2406 . 2415) (2418 . 2431)
2432 (2437 . 2444) (2447 . 2448) (2451 . 2472) (2474 . 2480)
2482 (2486 . 2489) 2493 2510 (2524 . 2525) (2527 . 2529) (2534 . 2545)
(2548 . 2553) (2565 . 2570) (2575 . 2576) (2579 . 2600)
(2602 . 2608) (2610 . 2611) (2613 . 2614) (2616 . 2617) (2649 . 2652)
2654 (2662 . 2671) (2674 . 2676) (2693 . 2701) (2703 . 2705)
(2707 . 2728) (2730 . 2736) (2738 . 2739) (2741 . 2745) 2749 2768
(2784 . 2785) (2790 . 2799) (2821 . 2828) (2831 . 2832) (2835 . 2856)
(2858 . 2864) (2866 . 2867) (2869 . 2873) 2877 (2908 . 2909)
(2911 . 2913) (2918 . 2927) (2929 . 2935) 2947 (2949 . 2954) (2958 . 2960)
(2962 . 2965) (2969 . 2970) 2972 (2974 . 2975) (2979 . 2980)
(2984 . 2986) (2990 . 3001) 3024 (3046 . 3058) (3077 . 3084) (3086 . 3088)
(3090 . 3112) (3114 . 3129) 3133 (3160 . 3161) (3168 . 3169)
(3174 . 3183) (3192 . 3198) (3205 . 3212) (3214 . 3216) (3218 . 3240)
(3242 . 3251) (3253 . 3257) 3261 3294 (3296 . 3297) (3302 . 3311)
(3313 . 3314) (3333 . 3340) (3342 . 3344) (3346 . 3386) 3389
3406 (3424 . 3425) (3430 . 3445) (3450 . 3455) (3461 . 3478) (3482 . 3505)
(3507 . 3515) 3517 (3520 . 3526) (3558 . 3567) (3585 . 3632)
(3634 . 3635) (3648 . 3653) (3664 . 3673) (3713 . 3714) 3716 (3719 . 3720)
3722 3725 (3732 . 3735) (3737 . 3743) (3745 . 3747) 3749
3751 (3754 . 3755) (3757 . 3760) (3762 . 3763) 3773 (3776 . 3780)
(3792 . 3801) (3804 . 3807) 3840 (3872 . 3891) (3904 . 3911) (3913 . 3948)
(3976 . 3980) (4096 . 4138) (4159 . 4169) (4176 . 4181)
(4186 . 4189) 4193 (4197 . 4198) (4206 . 4208) (4213 . 4225) 4238
(4240 . 4249) (4256 . 4293) 4295 4301 (4304 . 4346) (4349 . 4351)
(4352 . 4607) (4608 . 4680) (4682 . 4685) (4688 . 4694) 4696 (4698 . 4701)
(4704 . 4744) (4746 . 4749) (4752 . 4784) (4786 . 4789)
(4792 . 4798) 4800 (4802 . 4805) (4808 . 4822) (4824 . 4880) (4882 . 4885)
(4888 . 4954) (4969 . 4988) (4992 . 5007) (5024 . 5108)
(5121 . 5740) (5743 . 5759) (5761 . 5786) (5792 . 5866) (5873 . 5880)
(5888 . 5900) (5902 . 5905) (5920 . 5937) (5952 . 5969)
(5984 . 5996) (5998 . 6000) (6016 . 6067) 6108 (6112 . 6121) (6128 . 6137)
(6160 . 6169) (6176 . 6210) (6212 . 6263) (6272 . 6312) 6314
(6320 . 6389) (6400 . 6430) (6470 . 6479) (6480 . 6509) (6512 . 6516)
(6528 . 6571) (6593 . 6599) (6608 . 6618) (6656 . 6678)
(6688 . 6740) (6784 . 6793) (6800 . 6809) (6917 . 6963) (6981 . 6987)
(6992 . 7001) (7043 . 7072) (7086 . 7103) (7104 . 7141)
(7168 . 7203) (7232 . 7241) (7245 . 7247) (7248 . 7287) (7401 . 7404)
(7406 . 7409) (7413 . 7414) (7424 . 7467) (7531 . 7543)
(7545 . 7551) (7552 . 7578) (7680 . 7935) (7936 . 7957) (7960 . 7965)
(7968 . 8005) (8008 . 8013) (8016 . 8023) 8025 8027 8029
(8031 . 8061) (8064 . 8116) (8118 . 8124) 8126 (8130 . 8132) (8134 . 8140)
(8144 . 8147) (8150 . 8155) (8160 . 8172) (8178 . 8180)
(8182 . 8188) 8304 (8308 . 8313) (8320 . 8329) 8450 8455 (8458 . 8467)
8469 (8473 . 8477) 8484 8486 8488 (8490 . 8493) (8495 . 8505)
(8508 . 8511) (8517 . 8521) 8526 (8528 . 8543) (8579 . 8580)
8585 (9312 . 9371) (9450 . 9471) (10102 . 10131) (11264 . 11310)
(11312 . 11358) (11360 . 11387) (11390 . 11391) (11392 . 11492)
(11499 . 11502) (11506 . 11507) 11517 (11520 . 11557) 11559 11565
(11568 . 11623) (11648 . 11670) (11680 . 11686) (11688 . 11694)
(11696 . 11702) (11704 . 11710) (11712 . 11718) (11720 . 11726)
(11728 . 11734) (11736 . 11742) 12294 12348 (12353 . 12438) 12447
(12449 . 12538) 12543 (12549 . 12589) (12593 . 12686) (12690 . 12693)
(12704 . 12730) (12784 . 12799) (12832 . 12841) (12872 . 12879)
(12881 . 12895) (12928 . 12937) (12977 . 12991) (13312 . 19893)
(19968 . 40908) (40960 . 40980) (40982 . 42124) (42192 . 42231)
(42240 . 42507) (42512 . 42539) (42560 . 42606) (42624 . 42651)
(42656 . 42725) (42786 . 42863) (42865 . 42887) (42891 . 42894)
(42896 . 42925) (42928 . 42929) 42999 (43002 . 43007)
(43008 . 43009) (43011 . 43013) (43015 . 43018) (43020 . 43042)
(43056 . 43061) (43072 . 43123) (43138 . 43187) (43216 . 43225)
(43250 . 43255) 43259 (43264 . 43301) (43312 . 43334) (43360 . 43388)
(43396 . 43442) (43472 . 43481) (43488 . 43492) (43495 . 43518)
(43520 . 43560) (43584 . 43586) (43588 . 43595) (43600 . 43609)
(43616 . 43631) (43633 . 43638) 43642 (43646 . 43647)
(43648 . 43695) 43697 (43701 . 43702) (43705 . 43709) 43712 43714
(43739 . 43740) (43744 . 43754) 43762 (43777 . 43782) (43785 . 43790)
(43793 . 43798) (43808 . 43814) (43816 . 43822) (43824 . 43866)
(43876 . 43877) (43968 . 44002) (44016 . 44025) (44032 . 55203)
(55216 . 55238) (55243 . 55291) (63744 . 64109) (64112 . 64217)
(64256 . 64262) (64275 . 64279) 64285 (64287 . 64296)
(64298 . 64310) (64312 . 64316) 64318 (64320 . 64321) (64323 . 64324)
(64326 . 64335) (64336 . 64433) (64467 . 64829) (64848 . 64911)
(64914 . 64967) (65008 . 65019) (65136 . 65140) (65142 . 65276)
(65296 . 65305) (65313 . 65338) (65345 . 65370) (65382 . 65391)
(65393 . 65437) (65440 . 65470) (65474 . 65479) (65482 . 65487)
(65490 . 65495) (65498 . 65500) (65536 . 65547) (65549 . 65574)
(65576 . 65594) (65596 . 65597) (65599 . 65613) (65616 . 65629)
(65664 . 65786) (65799 . 65843) (65909 . 65912) (65930 . 65931)
(66176 . 66204) (66208 . 66256) (66273 . 66299) (66304 . 66339)
(66352 . 66368) (66370 . 66377) (66384 . 66421) (66432 . 66461)
(66464 . 66499) (66504 . 66511) (66560 . 66639) (66640 . 66687)
(66688 . 66717) (66720 . 66729) (66816 . 66855) (66864 . 66915)
(67072 . 67382) (67392 . 67413) (67424 . 67431) (67584 . 67589)
67592 (67594 . 67637) (67639 . 67640) 67644 67647 (67648 . 67669)
(67672 . 67679) (67680 . 67702) (67705 . 67711) (67712 . 67742)
(67751 . 67759) (67840 . 67867) (67872 . 67897) (67968 . 67999)
(68000 . 68023) (68030 . 68031) 68096 (68112 . 68115)
(68117 . 68119) (68121 . 68147) (68160 . 68167) (68192 . 68222)
(68224 . 68255) (68288 . 68295) (68297 . 68324) (68331 . 68335)
(68352 . 68405) (68416 . 68437) (68440 . 68447) (68448 . 68466)
(68472 . 68479) (68480 . 68497) (68521 . 68527) (68608 . 68680)
(69216 . 69246) (69635 . 69687) (69714 . 69743) (69763 . 69807)
(69840 . 69864) (69872 . 69881) (69891 . 69926) (69942 . 69951)
(69968 . 70002) 70006 (70019 . 70066) (70081 . 70084) (70096 . 70106)
(70113 . 70132) (70144 . 70161) (70163 . 70187) (70320 . 70366)
(70384 . 70393) (70405 . 70412) (70415 . 70416) (70419 . 70440)
(70442 . 70448) (70450 . 70451) (70453 . 70457) 70461
(70493 . 70497) (70784 . 70831) (70852 . 70853) 70855 (70864 . 70873)
(71040 . 71086) (71168 . 71215) 71236 (71248 . 71257)
(71296 . 71338) (71360 . 71369) (71840 . 71922) 71935 (72384 . 72440)
(73728 . 74648) (77824 . 78894) (92160 . 92728) (92736 . 92766)
(92768 . 92777) (92880 . 92909) (92928 . 92975) (93008 . 93017)
(93019 . 93025) (93027 . 93047) (93053 . 93071) (93952 . 94020)
94032 (110592 . 110593) (113664 . 113770) (113776 . 113788)
(113792 . 113800) (113808 . 113817) (119648 . 119665) (119808 . 119892)
(119894 . 119964) (119966 . 119967) 119970 (119973 . 119974)
(119977 . 119980) (119982 . 119993) 119995 (119997 . 120003)
(120005 . 120069) (120071 . 120074) (120077 . 120084)
(120086 . 120092) (120094 . 120121) (120123 . 120126) (120128 . 120132)
120134 (120138 . 120144) (120146 . 120485) (120488 . 120512)
(120514 . 120538) (120540 . 120570) (120572 . 120596)
(120598 . 120628) (120630 . 120654) (120656 . 120686) (120688 . 120712)
(120714 . 120744) (120746 . 120770) (120772 . 120779)
(120782 . 120831) (124928 . 125124) (125127 . 125135) (126464 . 126467)
(126469 . 126495) (126497 . 126498) 126500 126503 (126505 . 126514)
(126516 . 126519) 126521 126523 126530 126535 126537
126539 (126541 . 126543) (126545 . 126546) 126548 126551 126553
126555 126557 126559 (126561 . 126562) 126564 (126567 . 126570)
(126572 . 126578) (126580 . 126583) (126585 . 126588) 126590 (126592 . 126601)
(126603 . 126619) (126625 . 126627) (126629 . 126633)
(126635 . 126651) (127232 . 127244) (131072 . 173782) (173824 . 177972)
(177984 . 178205) (194560 . 195101)))
;; Syntax table.
(defvar haskell-mode-syntax-table
(let ((table (make-syntax-table)))
(modify-syntax-entry ?\ " " table)
(modify-syntax-entry ?\t " " table)
(modify-syntax-entry ?\" "\"" table)
(modify-syntax-entry ?\' "_" table)
(modify-syntax-entry ?_ "_" table)
(modify-syntax-entry ?\( "()" table)
(modify-syntax-entry ?\) ")(" table)
(modify-syntax-entry ?\[ "(]" table)
(modify-syntax-entry ?\] ")[" table)
(modify-syntax-entry ?\{ "(}1nb" table)
(modify-syntax-entry ?\} "){4nb" table)
(modify-syntax-entry ?- ". 123" table)
(modify-syntax-entry ?\n ">" table)
(modify-syntax-entry ?\` "$`" table)
(mapc (lambda (x)
(modify-syntax-entry x "." table))
"!#$%&*+./:<=>?@^|~,;\\")
;; Haskell symbol characters are treated as punctuation because
;; they are not able to form identifiers with word constituent 'w'
;; class characters.
(dolist (charcodes haskell--char-syntax-symbols)
(modify-syntax-entry charcodes "." table))
;; ... and for identifier characters
(dolist (charcodes haskell--char-syntax-identifiers)
(modify-syntax-entry charcodes "w" table))
table)
"Syntax table used in Haskell mode.")
(defun haskell-syntax-propertize (begin end)
(save-excursion
(when haskell-literate
(goto-char begin)
;; Algorithm (first matching rule wins):
;; - current line is latex code if previous non-empty line was
;; latex code or was \begin{code} and current line is not
;; \end{code}
;; - current line is bird code if it starts with >
;; - else literate comment
(let ((previous-line-latex-code
(catch 'return
(save-excursion
(when (= (forward-line -1) 0)
(while (looking-at-p "^[\t ]*$")
(unless (= (forward-line -1) 0)
(throw 'return nil)))
(or
(and
(not (equal (string-to-syntax "<") (syntax-after (point))))
(not (looking-at-p "^>")))
(looking-at-p "^\\\\begin{code}[\t ]*$")))))))
(while (< (point) end)
(unless (looking-at-p "^[\t ]*$")
(if previous-line-latex-code
(if (looking-at-p "^\\\\end{code}[\t ]*$")
(progn
(put-text-property (point) (1+ (point)) 'syntax-table (string-to-syntax "<"))
(setq previous-line-latex-code nil))
;; continue latex-code
)
(if (looking-at-p "^>")
;; this is a whitespace
(put-text-property (point) (1+ (point)) 'syntax-table (string-to-syntax "-"))
;; this is a literate comment
(progn
(put-text-property (point) (1+ (point)) 'syntax-table (string-to-syntax "<"))
(when (looking-at-p "^\\\\begin{code}[\t ]*$")
(setq previous-line-latex-code t))))))
(forward-line 1))))
(goto-char begin)
(let ((ppss (syntax-ppss)))
(when (nth 4 ppss)
;; go to the end of a comment, there is nothing to see inside
;; a comment so we might as well just skip over it
;; immediatelly
(setq ppss (parse-partial-sexp (point) (point-max) nil nil ppss
'syntax-table)))
(when (nth 8 ppss)
;; go to the beginning of a comment or string
(goto-char (nth 8 ppss))
(when (equal ?| (nth 3 ppss))
;; if this is a quasi quote we need to backtrack even more
;; to the opening bracket
(skip-chars-backward "^[")
(goto-char (1- (point)))))
(while (< (point) end)
(let
((token-kind (haskell-lexeme-looking-at-token)))
(cond
((equal token-kind 'qsymid)
(when (member
(haskell-lexeme-classify-by-first-char (char-after (match-beginning 1)))
'(varsym consym))
;; we have to neutralize potential comments here
(put-text-property (match-beginning 1) (match-end 1) 'syntax-table (string-to-syntax "."))))
((equal token-kind 'number)
(put-text-property (match-beginning 0) (match-end 0) 'syntax-table (string-to-syntax "w")))
((equal token-kind 'char)
(put-text-property (match-beginning 0) (1+ (match-beginning 0)) 'syntax-table (string-to-syntax "\""))
(put-text-property (1- (match-end 0)) (match-end 0) 'syntax-table (string-to-syntax "\"")))
((equal token-kind 'string)
(save-excursion
(goto-char (match-beginning 2))
(let ((limit (match-end 2)))
(save-match-data
(while (re-search-forward "\"" limit t)
(put-text-property (match-beginning 0) (match-end 0) 'syntax-table (string-to-syntax ".")))))
;; Place a generic string delimeter only when an open
;; quote is closed by end-of-line Emacs acts strangely
;; when a generic delimiter is not closed so in case
;; string ends at the end of the buffer we will use
;; plain string
(when (and (not (match-beginning 3))
(not (equal (match-end 2) (point-max))))
(put-text-property (match-beginning 1) (match-end 1) 'syntax-table (string-to-syntax "|"))
(put-text-property (match-end 2 ) (1+ (match-end 2)) 'syntax-table (string-to-syntax "|")))))
((equal token-kind 'template-haskell-quasi-quote)
(put-text-property (match-beginning 2) (match-end 2) 'syntax-table (string-to-syntax "\""))
(when (match-beginning 4)
(put-text-property (match-beginning 4) (match-end 4) 'syntax-table (string-to-syntax "\"")))
(save-excursion
(goto-char (match-beginning 3))
(let ((limit (match-end 3)))
(save-match-data
(while (re-search-forward "\"" limit t)
(put-text-property (match-beginning 0) (match-end 0) 'syntax-table (string-to-syntax "."))))))))
(if token-kind
(goto-char (match-end 0))
(goto-char end)))))))
(defun haskell-ident-at-point ()
"Return the identifier near point going backward or nil if none found.
May return a qualified name."
(let ((reg (haskell-ident-pos-at-point)))
(when reg
(buffer-substring-no-properties (car reg) (cdr reg)))))
(defun haskell-spanable-pos-at-point ()
"Like `haskell-ident-pos-at-point', but includes any surrounding backticks."
(save-excursion
(let ((pos (haskell-ident-pos-at-point)))
(when pos
(cl-destructuring-bind (start . end) pos
(if (and (eq ?` (char-before start))
(eq ?` (char-after end)))
(cons (- start 1) (+ end 1))
(cons start end)))))))
(defun haskell-ident-pos-at-point ()
"Return the span of the identifier near point going backward.
Returns nil if no identifier found or point is inside string or
comment. May return a qualified name."
(when (not (nth 8 (syntax-ppss)))
;; Do not handle comments and strings
(let (start end)
;; Initial point position is non-deterministic, it may occur anywhere
;; inside identifier span, so the approach is:
;; - first try go left and find left boundary
;; - then try go right and find right boundary
;;
;; In both cases assume the longest path, e.g. when going left take into
;; account than point may occur at the end of identifier, when going right
;; take into account that point may occur at the beginning of identifier.
;;
;; We should handle `.` character very careful because it is heavily
;; overloaded. Examples of possible cases:
;; Control.Monad.>>= -- delimiter
;; Control.Monad.when -- delimiter
;; Data.Aeson..: -- delimiter and operator symbol
;; concat.map -- composition function
;; .? -- operator symbol
(save-excursion
;; First, skip whitespace if we're on it, moving point to last
;; identifier char. That way, if we're at "map ", we'll see the word
;; "map".
(when (and (eolp)
(not (bolp)))
(backward-char))
(when (and (not (eobp))
(eq (char-syntax (char-after)) ? ))
(skip-chars-backward " \t")
(backward-char))
;; Now let's try to go left.
(save-excursion
(if (not (haskell-mode--looking-at-varsym))
;; Looking at non-operator char, this is quite simple
(progn
(skip-syntax-backward "w_")
;; Remember position
(setq start (point)))
;; Looking at operator char.
(while (and (not (bobp))
(haskell-mode--looking-at-varsym))
;; skip all operator chars backward
(setq start (point))
(backward-char))
;; Extra check for case when reached beginning of the buffer.
(when (haskell-mode--looking-at-varsym)
(setq start (point))))
;; Slurp qualification part if present. If identifier is qualified in
;; case of non-operator point will stop before `.` dot, but in case of
;; operator it will stand at `.` delimiting dot. So if we're looking
;; at `.` let's step one char forward and try to get qualification
;; part.
(goto-char start)
(when (looking-at-p (rx "."))
(forward-char))
(let ((pos (haskell-mode--skip-qualification-backward)))
(when pos
(setq start pos))))
;; Finally, let's try to go right.
(save-excursion
;; Try to slurp qualification part first.
(skip-syntax-forward "w_")
(setq end (point))
(while (and (looking-at (rx "." upper))
(not (zerop (progn (forward-char)
(skip-syntax-forward "w_")))))
(setq end (point)))
;; If point was at non-operator we already done, otherwise we need an
;; extra check.
(while (haskell-mode--looking-at-varsym)
(forward-char)
(setq end (point))))
(when (not (= start end))
(cons start end))))))
(defun haskell-mode--looking-at-varsym ()
"Return t when point stands at operator symbol."
(when (not (eobp))
(let ((lex (haskell-lexeme-classify-by-first-char (char-after))))
(or (eq lex 'varsym)
(eq lex 'consym)))))
(defun haskell-mode--skip-qualification-backward ()
"Skip qualified part of identifier backward.
Expects point stands *after* delimiting dot.
Returns beginning position of qualified part or nil if no qualified part found."
(when (not (and (bobp)
(looking-at (rx bol))))
(let ((case-fold-search nil)
pos)
(while (and (eq (char-before) ?.)
(progn (backward-char)
(not (zerop (skip-syntax-backward "w'"))))
(skip-syntax-forward "'")
(looking-at "[[:upper:]]"))
(setq pos (point)))
pos)))
(defun haskell-delete-indentation (&optional arg)
"Like `delete-indentation' but ignoring Bird-style \">\"."
(interactive "*P")
(let ((fill-prefix (or fill-prefix (if (eq haskell-literate 'bird) ">"))))
(delete-indentation arg)))
(defvar eldoc-print-current-symbol-info-function)
;; The main mode functions
;;;###autoload
(define-derived-mode haskell-mode prog-mode "Haskell"
"Major mode for editing Haskell programs.
\\<haskell-mode-map>
Literate Haskell scripts are supported via `literate-haskell-mode'.
The variable `haskell-literate' indicates the style of the script in the
current buffer. See the documentation on this variable for more details.
Use `haskell-version' to find out what version of Haskell mode you are
currently using.
Additional Haskell mode modules can be hooked in via `haskell-mode-hook'.
Indentation modes:
`haskell-indentation-mode', Kristof Bastiaensen, Gergely Risko
Intelligent semi-automatic indentation Mk2
`haskell-indent-mode', Guy Lapalme
Intelligent semi-automatic indentation.
Interaction modes:
`interactive-haskell-mode'
Interact with per-project GHCi processes through a REPL and
directory-aware sessions.
`inf-haskell-mode'
Interact with a GHCi process using comint-mode. Deprecated.
Other modes:
`haskell-decl-scan-mode', Graeme E Moss
Scans top-level declarations, and places them in a menu.
`haskell-doc-mode', Hans-Wolfgang Loidl
Echoes types of functions or syntax of keywords when the cursor is idle.
To activate a minor-mode, simply run the interactive command. For
example, `M-x haskell-doc-mode'. Run it again to disable it.
To enable a mode for every haskell-mode buffer, add a hook in
your Emacs configuration. To do that you can customize
`haskell-mode-hook' or add lines to your .emacs file. For
example, to enable `interactive-haskell-mode', use the following:
(add-hook 'haskell-mode-hook 'interactive-haskell-mode)
Minor modes that work well with `haskell-mode':
- `smerge-mode': show and work with diff3 conflict markers used
by git, svn and other version control systems."
:group 'haskell
(when (version< emacs-version "24.3")
(error "haskell-mode requires at least Emacs 24.3"))
;; paragraph-{start,separate} should treat comments as paragraphs as well.
(setq-local paragraph-start (concat " *{-\\| *-- |\\|" page-delimiter))
(setq-local paragraph-separate (concat " *$\\| *\\({-\\|-}\\) *$\\|" page-delimiter))
(setq-local fill-paragraph-function 'haskell-fill-paragraph)
;; (setq-local adaptive-fill-function 'haskell-adaptive-fill)
(setq-local comment-start "-- ")
(setq-local comment-padding 0)
(setq-local comment-start-skip "[-{]-[ \t]*")
(setq-local comment-end "")
(setq-local comment-end-skip "[ \t]*\\(-}\\|\\s>\\)")
(setq-local forward-sexp-function #'haskell-forward-sexp)
(setq-local parse-sexp-ignore-comments nil)
(setq-local syntax-propertize-function #'haskell-syntax-propertize)
;; Set things up for eldoc-mode.
(setq-local eldoc-documentation-function 'haskell-doc-current-info)
;; Set things up for imenu.
(setq-local imenu-create-index-function 'haskell-ds-create-imenu-index)
;; Set things up for font-lock.
(setq-local font-lock-defaults
'((haskell-font-lock-keywords)
nil nil nil nil
(font-lock-syntactic-face-function
. haskell-syntactic-face-function)
;; Get help from font-lock-syntactic-keywords.
(parse-sexp-lookup-properties . t)
(font-lock-extra-managed-props . (composition haskell-type))))
;; Preprocessor definitions can have backslash continuations
(setq-local font-lock-multiline t)
;; Haskell's layout rules mean that TABs have to be handled with extra care.
;; The safer option is to avoid TABs. The second best is to make sure
;; TABs stops are 8 chars apart, as mandated by the Haskell Report. --Stef
(setq-local indent-tabs-mode nil)
(setq-local tab-width 8)
(setq-local comment-auto-fill-only-comments t)
;; Haskell is not generally suitable for electric indentation, since
;; there is no unambiguously correct indent level for any given line.
(when (boundp 'electric-indent-inhibit)
(setq electric-indent-inhibit t))
;; dynamic abbrev support: recognize Haskell identifiers
;; Haskell is case-sensitive language
(setq-local dabbrev-case-fold-search nil)
(setq-local dabbrev-case-distinction nil)
(setq-local dabbrev-case-replace nil)
(setq-local dabbrev-abbrev-char-regexp "\\sw\\|[.]")
(setq haskell-literate nil)
(add-hook 'before-save-hook 'haskell-mode-before-save-handler nil t)
(add-hook 'after-save-hook 'haskell-mode-after-save-handler nil t)
;; provide non-interactive completion function
(add-hook 'completion-at-point-functions
'haskell-completions-completion-at-point
nil
t)
(haskell-indentation-mode))
(defcustom haskell-mode-hook '(haskell-indentation-mode interactive-haskell-mode)
"List of functions to run after `haskell-mode' is enabled.
Use to enable minor modes coming with `haskell-mode' or run an
arbitrary function.
Note that `inf-haskell-mode' should not be enabled at the same
time as `haskell-interactive-mode', same exclusion principle
applies to `haskell-indentation-mode' and `haskell-indent-mode'."
:group 'haskell
:type 'hook
:options '(capitalized-words-mode
flyspell-prog-mode
haskell-decl-scan-mode
haskell-indent-mode
haskell-indentation-mode
highlight-uses-mode
imenu-add-menubar-index
inf-haskell-mode
interactive-haskell-mode
turn-on-haskell-unicode-input-method))
(defun haskell-fill-paragraph (justify)
(save-excursion
;; Fill paragraph should only work in comments.
;; The -- comments are handled properly by default
;; The {- -} comments need some extra love.
(let* ((syntax-values (syntax-ppss))
(comment-num (nth 4 syntax-values)))
(cond
((eq t comment-num)
;; standard fill works wonders inside a non-nested comment
(fill-comment-paragraph justify))
((integerp comment-num)
;; we are in a nested comment. lets narrow to comment content
;; and use plain paragraph fill for that
(let* ((comment-start-point (nth 8 syntax-values))
(comment-end-point
(save-excursion
(goto-char comment-start-point)
(forward-sexp)
;; Find end of any comment even if forward-sexp
;; fails to find the right braces.
(backward-char 3)
(re-search-forward "[ \t]?-}" nil t)
(match-beginning 0)))
(fill-start (+ 2 comment-start-point))
(fill-end comment-end-point)
(fill-paragraph-handle-comment nil))
(save-restriction
(narrow-to-region fill-start fill-end)
(fill-paragraph justify)
;; If no filling happens, whatever called us should not
;; continue with standard text filling, so return t
t)))
((eolp)
;; do nothing outside of a comment
t)
(t
;; go to end of line and try again
(end-of-line)
(haskell-fill-paragraph justify))))))
;; (defun haskell-adaptive-fill ()
;; ;; We want to use "-- " as the prefix of "-- |", etc.
;; (let* ((line-end (save-excursion (end-of-line) (point)))
;; (line-start (point)))
;; (save-excursion
;; (unless (in-comment)
;; ;; Try to find the start of a comment. We only fill comments.
;; (search-forward-regexp comment-start-skip line-end t))
;; (when (in-comment)
;; (let ();(prefix-start (point)))
;; (skip-syntax-forward "^w")
;; (make-string (- (point) line-start) ?\s))))))
;;;###autoload
(defun haskell-forward-sexp (&optional arg)
"Haskell specific version of `forward-sexp'.
Move forward across one balanced expression (sexp). With ARG, do
it that many times. Negative arg -N means move backward across N
balanced expressions. This command assumes point is not in a
string or comment.
If unable to move over a sexp, signal `scan-error' with three
arguments: a message, the start of the obstacle (a parenthesis or
list marker of some kind), and end of the obstacle."
(interactive "^p")
(or arg (setq arg 1))
(if (< arg 0)
(while (< arg 0)
(skip-syntax-backward "->")
;; Navigate backwards using plain `backward-sexp', assume that it
;; skipped over at least one Haskell expression, and jump forward until
;; last possible point before the starting position. If applicable,
;; `scan-error' is signalled by `backward-sexp'.
(let ((end (point))
(forward-sexp-function nil))
(backward-sexp)
(let ((cur (point)))
(while (< (point) end)
(setf cur (point))
(haskell-forward-sexp)
(skip-syntax-forward "->"))
(goto-char cur)))
(setf arg (1+ arg)))
(save-match-data
(while (> arg 0)
(when (haskell-lexeme-looking-at-token)
(cond ((member (match-string 0) (list "(" "[" "{"))
(goto-char (or (scan-sexps (point) 1) (buffer-end 1))))
((member (match-string 0) (list ")" "]" "}"))
(signal 'scan-error (list "Containing expression ends prematurely."
(match-beginning 0)
(match-end 0))))
(t (goto-char (match-end 0)))))
(setf arg (1- arg))))))
;;;###autoload
(define-derived-mode literate-haskell-mode haskell-mode "LitHaskell"
"As `haskell-mode' but for literate scripts."
(setq haskell-literate
(save-excursion
(goto-char (point-min))
(cond
((re-search-forward "^\\\\\\(begin\\|end\\){code}$" nil t) 'tex)
((re-search-forward "^>" nil t) 'bird)
(t haskell-literate-default))))
(if (eq haskell-literate 'bird)
;; fill-comment-paragraph isn't much use there, and even gets confused
;; by the syntax-table text-properties we add to mark the first char
;; of each line as a comment-starter.
(setq-local fill-paragraph-handle-comment nil))
(setq-local mode-line-process '("/" (:eval (symbol-name haskell-literate)))))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.[gh]s\\'" . haskell-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.l[gh]s\\'" . literate-haskell-mode))
;;;###autoload
(add-to-list 'auto-mode-alist '("\\.hsc\\'" . haskell-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist '("runghc" . haskell-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist '("runhaskell" . haskell-mode))
;;;###autoload
(add-to-list 'completion-ignored-extensions ".hi")
(defcustom haskell-check-command "hlint"
"*Command used to check a Haskell file."
:group 'haskell
:type '(choice (const "hlint")
(const "ghc -fno-code")
(string :tag "Other command")))
(defcustom haskell-tags-on-save nil
"Generate tags via hasktags after saving."
:group 'haskell
:type 'boolean)
(defvar haskell-saved-check-command nil
"Internal use.")
(defcustom haskell-indent-spaces 2
"Number of spaces to indent inwards."
:group 'haskell
:type 'integer)
;; Like Python. Should be abstracted, sigh.
(defun haskell-check (command)
"Check a Haskell file (default current buffer's file).
Runs COMMAND, a shell command, as if by `compile'.
See `haskell-check-command' for the default."
(interactive
(list (read-string "Checker command: "
(or haskell-saved-check-command
(concat haskell-check-command " "
(let ((name (buffer-file-name)))
(if name
(file-name-nondirectory name))))))))
(setq haskell-saved-check-command command)
(save-some-buffers (not compilation-ask-about-save) nil)
(compilation-start command))
(defun haskell-flymake-init ()
"Flymake init function for Haskell.
To be added to `flymake-init-create-temp-buffer-copy'."
(let ((checker-elts (and haskell-saved-check-command
(split-string haskell-saved-check-command))))
(list (car checker-elts)
(append (cdr checker-elts)
(list (flymake-init-create-temp-buffer-copy
'flymake-create-temp-inplace))))))
(add-to-list 'flymake-allowed-file-name-masks '("\\.l?hs\\'" haskell-flymake-init))
(defun haskell-mode-format-imports ()
"Format the imports by aligning and sorting them."
(interactive)
(let ((col (current-column)))
(haskell-sort-imports)
(haskell-align-imports)
(goto-char (+ (line-beginning-position)
col))))
(declare-function haskell-mode-stylish-buffer "haskell-commands")
(defun haskell-mode-before-save-handler ()
"Function that will be called before buffer's saving."
(when haskell-stylish-on-save
(ignore-errors (haskell-mode-stylish-buffer))))
;; From Bryan O'Sullivan's blog:
;; http://www.serpentine.com/blog/2007/10/09/using-emacs-to-insert-scc-annotations-in-haskell-code/
(defun haskell-mode-try-insert-scc-at-point ()
"Try to insert an SCC annotation at point. Return true if
successful, nil otherwise."
(if (or (looking-at "\\b\\|[ \t]\\|$")
;; Allow SCC if point is on a non-letter with whitespace to the left
(and (not (bolp))
(save-excursion
(forward-char -1)
(looking-at "[ \t]"))))
(let ((space-at-point (looking-at "[ \t]")))
(unless (and (not (bolp)) (save-excursion
(forward-char -1)
(looking-at "[ \t]")))
(insert " "))
(insert "{-# SCC \"\" #-}")
(unless space-at-point
(insert " "))
(forward-char (if space-at-point -5 -6))
t )))
(defun haskell-mode-insert-scc-at-point ()
"Insert an SCC annotation at point."
(interactive)
(if (not (haskell-mode-try-insert-scc-at-point))
(error "Not over an area of whitespace")))
(make-obsolete
'haskell-mode-insert-scc-at-point
'haskell-mode-toggle-scc-at-point
"2015-11-11")
(defun haskell-mode-try-kill-scc-at-point ()
"Try to kill an SCC annotation at point. Return true if
successful, nil otherwise."
(save-excursion
(let ((old-point (point))
(scc "\\({-#[ \t]*SCC \"[^\"]*\"[ \t]*#-}\\)[ \t]*"))
(while (not (or (looking-at scc) (bolp)))
(forward-char -1))
(if (and (looking-at scc)
(<= (match-beginning 1) old-point)
(> (match-end 1) old-point))
(progn (kill-region (match-beginning 0) (match-end 0))
t)))))
;; Also Bryan O'Sullivan's.
(defun haskell-mode-kill-scc-at-point ()
"Kill the SCC annotation at point."
(interactive)
(if (not (haskell-mode-try-kill-scc-at-point))
(error "No SCC at point")))
(make-obsolete
'haskell-mode-kill-scc-at-point
'haskell-mode-toggle-scc-at-point
"2015-11-11")
(defun haskell-mode-toggle-scc-at-point ()
"If point is in an SCC annotation, kill the annotation. Otherwise, try to insert a new annotation."
(interactive)
(if (not (haskell-mode-try-kill-scc-at-point))
(if (not (haskell-mode-try-insert-scc-at-point))
(error "Could not insert or remove SCC"))))
(defun haskell-guess-module-name-from-file-name (file-name)
"Guess the module name from FILE-NAME.
Based on given FILE-NAME this function tries to find path
components that look like module identifiers and composes full
module path using this information. For example:
/Abc/Def/Xyz.lhs => Abc.Def.Xyz
/Ab-c/Def/Xyz.lhs => Def.Xyz
src/Abc/Def/Xyz.hs => Abc.Def.Xyz
c:\\src\\Abc\\Def\\Xyz.hs => Abc.Def.Xyz
nonmodule.txt => nil
This function usually will be used with `buffer-file-name':
(haskell-guess-module-name-from-file-name (buffer-file-name))"
(let* ((file-name-sans-ext (file-name-sans-extension file-name))
(components (cl-loop for part
in (reverse (split-string file-name-sans-ext "/"))
while (let ((case-fold-search nil))
(string-match (concat "^" haskell-lexeme-modid "$") part))
collect part)))
(when components
(mapconcat 'identity (reverse components) "."))))
(defun haskell-guess-module-name ()
"Guess the current module name of the buffer.
Uses `haskell-guess-module-name-from-file-name'."
(haskell-guess-module-name-from-file-name (buffer-file-name)))
(defvar haskell-auto-insert-module-format-string
"-- | \n\nmodule %s where\n\n"
"Template string that will be inserted in new haskell buffers via `haskell-auto-insert-module-template'.")
(defun haskell-auto-insert-module-template ()
"Insert a module template for the newly created buffer."
(interactive)
(when (and (= (point-min)
(point-max))
(buffer-file-name))
(insert (format haskell-auto-insert-module-format-string (haskell-guess-module-name-from-file-name (buffer-file-name))))
(goto-char (point-min))
(end-of-line)))
;;;###autoload
(defun haskell-mode-generate-tags (&optional and-then-find-this-tag)
"Generate tags using Hasktags. This is synchronous function.
If optional AND-THEN-FIND-THIS-TAG argument is present it is used
with function `xref-find-definitions' after new table was
generated."
(interactive)
(let* ((dir (haskell-cabal--find-tags-dir))
(command (haskell-cabal--compose-hasktags-command dir)))
(if (not command)
(error "Unable to compose hasktags command")
(shell-command command)
(haskell-mode-message-line "Tags generated.")
(when and-then-find-this-tag
(let ((tags-file-name dir))
(xref-find-definitions and-then-find-this-tag))))))
(defun haskell-mode-message-line (str)
"Echo STR in mini-buffer.
Given string is shrinken to single line, multiple lines just
disturbs the programmer."
(message "%s" (haskell-mode-one-line str (frame-width))))
(defun haskell-mode-one-line (str width)
"Try to fit STR as much as possible on one line according to given WIDTH."
(let* ((long-line (replace-regexp-in-string "\n" " " str))
(condensed (replace-regexp-in-string
" +" " " (haskell-string-trim long-line))))
(truncate-string-to-width condensed width nil nil "")))
;; Provide ourselves:
(provide 'haskell-mode)
;;; haskell-mode.el ends here