lisp/ediff-help.el

   1 ;;; ediff-help.el --- Code related to the contents of Ediff help buffers
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
   5
   6 ;; Author: Michael Kifer <kifer@cs.stonybrook.edu>
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 3, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Commentary:
  26
  27 ;;; Code:
  28
  29
  30 ;; Compiler pacifier start
  31 (defvar ediff-multiframe)
  32
  33 (eval-when-compile
  34   (let ((load-path (cons (expand-file-name ".") load-path)))
  35     (or (featurep 'ediff-init)
  36         (load "ediff-init.el" nil t 'nosuffix))
  37     ))
  38 ;; end pacifier
  39
  40 (require 'ediff-init)
  41
  42 ;; Help messages
  43
  44 (defconst ediff-long-help-message-head
  45   "    Move around      |      Toggle features      |        Manipulate
  46 =====================|===========================|============================="
  47   "The head of the full help message.")
  48 (defconst ediff-long-help-message-tail
  49   "=====================|===========================|=============================
  50     R -show registry |     = -compare regions    |  M   -show session group
  51     D -diff output   |     E -browse Ediff manual|  G   -send bug report
  52     i -status info   |     ? -help off           |  z/q -suspend/quit
  53 -------------------------------------------------------------------------------
  54 For help on a specific command:  Click Button 2 over it; or
  55                                  Put the cursor over it and type RET."
  56   "The tail of the full-help message.")
  57
  58 (defconst ediff-long-help-message-compare3
  59   "
  60 p,DEL -previous diff |     | -vert/horiz split   | xy -copy buf X's region to Y
  61 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
  62     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
  63    gx -goto X's point|    ## -ignore whitespace  |  ! -update diff regions
  64   C-l -recenter      |    #c -ignore case        |
  65   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
  66   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
  67     ~ -rotate buffers|     m -wide display       |
  68 "
  69   "Help message usually used for 3-way comparison.
  70 Normally, not a user option.  See `ediff-help-message' for details.")
  71
  72 (defconst ediff-long-help-message-compare2
  73   "
  74 p,DEL -previous diff |     | -vert/horiz split   |a/b -copy A/B's region to B/A
  75 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
  76     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
  77    gx -goto X's point|    ## -ignore whitespace  |  ! -update diff regions
  78   C-l -recenter      |    #c -ignore case        |
  79   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
  80   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
  81     ~ -swap variants |     m -wide display       |
  82 "
  83   "Help message usually used for 2-way comparison.
  84 Normally, not a user option.  See `ediff-help-message' for details.")
  85
  86 (defconst ediff-long-help-message-narrow2
  87   "
  88 p,DEL -previous diff |     | -vert/horiz split   |a/b -copy A/B's region to B/A
  89 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
  90     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
  91    gx -goto X's point|    ## -ignore whitespace  |  ! -update diff regions
  92   C-l -recenter      |    #c -ignore case        |  % -narrow/widen buffs
  93   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
  94   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
  95     ~ -swap variants |     m -wide display       |
  96 "
  97   "Help message when comparing windows or regions line-by-line.
  98 Normally, not a user option.  See `ediff-help-message' for details.")
  99
 100 (defconst ediff-long-help-message-word-mode
 101   "
 102 p,DEL -previous diff |     | -vert/horiz split   | xy -copy buf X's region to Y
 103 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
 104     j -jump to diff  |                           |
 105    gx -goto X's point|    % -narrow/widen buffs  |  ! -recompute diffs
 106   C-l -recenter      |    #c -ignore case        |
 107   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
 108   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
 109     ~ -swap variants |     m -wide display       |
 110 "
 111   "Help message when comparing windows or regions word-by-word.
 112 Normally, not a user option.  See `ediff-help-message' for details.")
 113
 114 (defconst ediff-long-help-message-merge
 115   "
 116 p,DEL -previous diff |     | -vert/horiz split   |  x -copy buf X's region to C
 117 n,SPC -next diff     |     h -hilighting         |  r -restore buf C's old diff
 118     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
 119    gx -goto X's point|    ## -ignore whitespace  |  ! -update diff regions
 120   C-l -recenter      | #f/#h -focus/hide regions |  + -combine diff regions
 121   v/V -scroll up/dn  |     X -read-only in buf X | wx -save buf X
 122   </> -scroll lt/rt  |     m -wide display       | wd -save diff output
 123     ~ -swap variants |     s -shrink window C    |  / -show ancestor buff
 124                      |  $$ -show clashes only    |  & -merge w/new default
 125                      |  $* -skip changed regions |
 126 "
 127   "Help message for merge sessions.
 128 Normally, not a user option.  See `ediff-help-message' for details.")
 129
 130 ;; The actual long help message.
 131 (ediff-defvar-local ediff-long-help-message ""
 132   "Normally, not a user option.  See `ediff-help-message' for details.")
 133
 134 (defconst ediff-brief-message-string
 135   " Type ? for help"
 136   "Contents of the brief help message.")
 137 ;; The actual brief help message
 138 (ediff-defvar-local ediff-brief-help-message ""
 139   "Normally, not a user option.  See `ediff-help-message' for details.")
 140
 141 (ediff-defvar-local ediff-brief-help-message-function nil
 142   "The brief help message that the user can customize.
 143 If the user sets this to a parameter-less function, Ediff will use it to
 144 produce the brief help message.  This function must return a string.")
 145 (ediff-defvar-local ediff-long-help-message-function nil
 146   "The long help message that the user can customize.
 147 See `ediff-brief-help-message-function' for more.")
 148
 149 (defcustom ediff-use-long-help-message nil
 150   "*If t, Ediff displays a long help message.  Short help message otherwise."
 151   :type 'boolean
 152   :group 'ediff-window)
 153
 154 ;; The actual help message.
 155 (ediff-defvar-local ediff-help-message ""
 156   "The actual help message.
 157 Normally, the user shouldn't touch this.  However, if you want Ediff to
 158 start up with different help messages for different jobs, you can change
 159 the value of this variable and the variables `ediff-help-message-*' in
 160 `ediff-startup-hook'.")
 161
 162
 163 ;; the keymap that defines clicks over the quick help regions
 164 (defvar ediff-help-region-map (make-sparse-keymap))
 165
 166 (define-key
 167   ediff-help-region-map
 168   (if (featurep 'emacs) [mouse-2] [button2])
 169   'ediff-help-for-quick-help)
 170
 171 ;; runs in the control buffer
 172 (defun ediff-set-help-overlays ()
 173   (goto-char (point-min))
 174   (let (overl beg end cmd)
 175     (while (re-search-forward " *\\([^ \t\n|]+\\||\\) +-[^|\n]+" nil 'noerror)
 176       (setq beg (match-beginning 0)
 177             end (match-end 0)
 178             cmd (buffer-substring (match-beginning 1) (match-end 1)))
 179       (setq overl (ediff-make-overlay beg end))
 180       (if (featurep 'emacs)
 181           (ediff-overlay-put overl 'mouse-face 'highlight)
 182         (ediff-overlay-put overl 'highlight t))
 183       (ediff-overlay-put overl 'ediff-help-info cmd))))
 184
 185
 186 (defun ediff-help-for-quick-help ()
 187   "Explain Ediff commands in more detail."
 188   (interactive)
 189   (ediff-barf-if-not-control-buffer)
 190   (let ((pos (ediff-event-point last-command-event))
 191         overl cmd)
 192
 193     (if (featurep 'xemacs)
 194         (setq overl (extent-at pos (current-buffer) 'ediff-help-info)
 195               cmd   (ediff-overlay-get overl 'ediff-help-info))
 196       (setq cmd (car (mapcar (lambda (elt)
 197                                (overlay-get elt 'ediff-help-info))
 198                              (overlays-at pos)))))
 199
 200     (if (not (stringp cmd))
 201         (error "Hmm...  I don't see an Ediff command around here..."))
 202
 203     (ediff-documentation "Quick Help Commands")
 204
 205     (let (case-fold-search)
 206       (cond ((string= cmd "?") (re-search-forward "^`\\?'"))
 207             ((string= cmd "G") (re-search-forward "^`G'"))
 208             ((string= cmd "E") (re-search-forward "^`E'"))
 209             ((string= cmd "wd") (re-search-forward "^`wd'"))
 210             ((string= cmd "wx") (re-search-forward "^`wa'"))
 211             ((string= cmd "a/b") (re-search-forward "^`a'"))
 212             ((string= cmd "x") (re-search-forward "^`a'"))
 213             ((string= cmd "xy") (re-search-forward "^`ab'"))
 214             ((string= cmd "p,DEL") (re-search-forward "^`p'"))
 215             ((string= cmd "n,SPC") (re-search-forward "^`n'"))
 216             ((string= cmd "j") (re-search-forward "^`j'"))
 217             ((string= cmd "gx") (re-search-forward "^`ga'"))
 218             ((string= cmd "!") (re-search-forward "^`!'"))
 219             ((string= cmd "*") (re-search-forward "^`\\*'"))
 220             ((string= cmd "m") (re-search-forward "^`m'"))
 221             ((string= cmd "|") (re-search-forward "^`|'"))
 222             ((string= cmd "@") (re-search-forward "^`@'"))
 223             ((string= cmd "h") (re-search-forward "^`h'"))
 224             ((string= cmd "r") (re-search-forward "^`r'"))
 225             ((string= cmd "rx") (re-search-forward "^`ra'"))
 226             ((string= cmd "##") (re-search-forward "^`##'"))
 227             ((string= cmd "#c") (re-search-forward "^`#c'"))
 228             ((string= cmd "#f/#h") (re-search-forward "^`#f'"))
 229             ((string= cmd "X") (re-search-forward "^`A'"))
 230             ((string= cmd "v/V") (re-search-forward "^`v'"))
 231             ((string= cmd "</>") (re-search-forward "^`<'"))
 232             ((string= cmd "~") (re-search-forward "^`~'"))
 233             ((string= cmd "i") (re-search-forward "^`i'"))
 234             ((string= cmd "D") (re-search-forward "^`D'"))
 235             ((string= cmd "R") (re-search-forward "^`R'"))
 236             ((string= cmd "M") (re-search-forward "^`M'"))
 237             ((string= cmd "z/q") (re-search-forward "^`z'"))
 238             ((string= cmd "%") (re-search-forward "^`%'"))
 239             ((string= cmd "C-l") (re-search-forward "^`C-l'"))
 240             ((string= cmd "$$") (re-search-forward "^`\\$\\$'"))
 241             ((string= cmd "$*") (re-search-forward "^`\\$\\*'"))
 242             ((string= cmd "/") (re-search-forward "^`/'"))
 243             ((string= cmd "&") (re-search-forward "^`&'"))
 244             ((string= cmd "s") (re-search-forward "^`s'"))
 245             ((string= cmd "+") (re-search-forward "^`\\+'"))
 246             ((string= cmd "=") (re-search-forward "^`='"))
 247             (t (error "Undocumented command! Type `G' in Ediff Control Panel to drop a note to the Ediff maintainer")))
 248       ) ; let case-fold-search
 249     ))
 250
 251
 252 ;; assuming we are in control window, calculate length of the first line in
 253 ;; help message
 254 (defun ediff-help-message-line-length ()
 255   (save-excursion
 256     (goto-char (point-min))
 257     (if ediff-use-long-help-message
 258         (forward-line 1))
 259     (end-of-line)
 260     (current-column)))
 261
 262
 263 (defun ediff-indent-help-message ()
 264   (let* ((shift (/ (max 0 (- (window-width (selected-window))
 265                              (ediff-help-message-line-length)))
 266                    2))
 267          (str (make-string shift ?\ )))
 268     (save-excursion
 269       (goto-char (point-min))
 270       (while (< (point) (point-max))
 271         (insert str)
 272         (beginning-of-line)
 273         (forward-line 1)))))
 274
 275
 276 ;; compose the help message as a string
 277 (defun ediff-set-help-message ()
 278   (setq ediff-long-help-message
 279         (cond ((and ediff-long-help-message-function
 280                     (or (symbolp ediff-long-help-message-function)
 281                         (consp ediff-long-help-message-function)))
 282                (funcall ediff-long-help-message-function))
 283               (ediff-word-mode
 284                (concat ediff-long-help-message-head
 285                        ediff-long-help-message-word-mode
 286                        ediff-long-help-message-tail))
 287               (ediff-narrow-job
 288                (concat ediff-long-help-message-head
 289                        ediff-long-help-message-narrow2
 290                        ediff-long-help-message-tail))
 291               (ediff-merge-job
 292                (concat ediff-long-help-message-head
 293                        ediff-long-help-message-merge
 294                        ediff-long-help-message-tail))
 295               (ediff-diff3-job
 296                (concat ediff-long-help-message-head
 297                        ediff-long-help-message-compare3
 298                        ediff-long-help-message-tail))
 299               (t
 300                (concat ediff-long-help-message-head
 301                        ediff-long-help-message-compare2
 302                        ediff-long-help-message-tail))))
 303   (setq ediff-brief-help-message
 304         (cond ((and ediff-brief-help-message-function
 305                     (or (symbolp ediff-brief-help-message-function)
 306                         (consp ediff-brief-help-message-function)))
 307                (funcall ediff-brief-help-message-function))
 308               ((stringp ediff-brief-help-message-function)
 309                ediff-brief-help-message-function)
 310               ((ediff-multiframe-setup-p) ediff-brief-message-string)
 311               (t ; long brief msg, not multiframe --- put in the middle
 312                ediff-brief-message-string)
 313               ))
 314   (setq ediff-help-message (if ediff-use-long-help-message
 315                                ediff-long-help-message
 316                              ediff-brief-help-message))
 317   (run-hooks 'ediff-display-help-hook))
 318
 319 ;;;###autoload
 320 (defun ediff-customize ()
 321   (interactive)
 322   (customize-group "ediff"))
 323
 324
 325 (provide 'ediff-help)
 326
 327
 328 ;;; arch-tag: 05659813-7fcf-4274-964f-d2f577431a9d
 329 ;;; ediff-help.el ends here