lisp/ediff-help.el

   1 ;;; ediff-help.el --- Code related to the contents of Ediff help buffers
   2
   3 ;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
   4
   5 ;; Author: Michael Kifer <kifer@cs.sunysb.edu>
   6
   7 ;; This file is part of GNU Emacs.
   8
   9 ;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation; either version 2, or (at your option)
  12 ;; any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;; Boston, MA 02111-1307, USA.
  23
  24 ;;; Code:
  25
  26 (provide 'ediff-help)
  27
  28 ;; Compiler pacifier start
  29 (defvar ediff-multiframe)
  30
  31 (eval-when-compile
  32   (let ((load-path (cons (expand-file-name ".") load-path)))
  33     (or (featurep 'ediff-init)
  34         (load "ediff-init.el" nil nil 'nosuffix))
  35     ))
  36 ;; end pacifier
  37
  38 (require 'ediff-init)
  39
  40 ;; Help messages
  41
  42 (defconst ediff-long-help-message-head
  43   "    Move around      |      Toggle features      |        Manipulate
  44 =====================|===========================|============================="
  45   "The head of the full help message.")
  46 (defconst ediff-long-help-message-tail
  47   "=====================|===========================|=============================
  48     R -show registry |     = -compare regions    |  M   -show session group
  49     D -diff output   |     E -browse Ediff manual|  G   -send bug report
  50     i -status info   |     ? -help off           |  z/q -suspend/quit
  51 -------------------------------------------------------------------------------
  52 For help on a specific command:  Click Button 2 over it; or
  53                                  Put the cursor over it and type RET."
  54   "The tail of the full-help message.")
  55
  56 (defconst ediff-long-help-message-compare3
  57   "
  58 p,DEL -previous diff |     | -vert/horiz split   | xy -copy buf X's region to Y
  59 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
  60     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
  61    gx -goto X's point|                           |  ! -update diff regions
  62   C-l -recenter      |    ## -ignore whitespace  |
  63   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
  64   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
  65     ~ -rotate buffers|     m -wide display       |
  66 "
  67   "Help message usually used for 3-way comparison.
  68 Normally, not a user option.  See `ediff-help-message' for details.")
  69
  70 (defconst ediff-long-help-message-compare2
  71   "
  72 p,DEL -previous diff |     | -vert/horiz split   |a/b -copy A/B's region to B/A
  73 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
  74     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
  75    gx -goto X's point|                           |  ! -update diff regions
  76   C-l -recenter      |    ## -ignore whitespace  |
  77   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
  78   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
  79     ~ -swap variants |     m -wide display       |
  80 "
  81   "Help message usually used for 2-way comparison.
  82 Normally, not a user option.  See `ediff-help-message' for details.")
  83
  84 (defconst ediff-long-help-message-narrow2
  85   "
  86 p,DEL -previous diff |     | -vert/horiz split   |a/b -copy A/B's region to B/A
  87 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
  88     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
  89    gx -goto X's point|     % -narrow/widen buffs |  ! -update diff regions
  90   C-l -recenter      |    ## -ignore whitespace  |
  91   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
  92   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
  93     ~ -swap variants |     m -wide display       |
  94 "
  95   "Help message when comparing windows or regions line-by-line.
  96 Normally, not a user option.  See `ediff-help-message' for details.")
  97
  98 (defconst ediff-long-help-message-word-mode
  99   "
 100 p,DEL -previous diff |     | -vert/horiz split   | xy -copy buf X's region to Y
 101 n,SPC -next diff     |     h -hilighting         | rx -restore buf X's old diff
 102     j -jump to diff  |                           |
 103    gx -goto X's point|     % -narrow/widen buffs |  ! -recompute diffs
 104   C-l -recenter      |                           |
 105   v/V -scroll up/dn  | #f/#h -focus/hide regions | wx -save buf X
 106   </> -scroll lt/rt  |     X -read-only in buf X | wd -save diff output
 107     ~ -swap variants |     m -wide display       |
 108 "
 109   "Help message when comparing windows or regions word-by-word.
 110 Normally, not a user option.  See `ediff-help-message' for details.")
 111
 112 (defconst ediff-long-help-message-merge
 113   "
 114 p,DEL -previous diff |     | -vert/horiz split   |  x -copy buf X's region to C
 115 n,SPC -next diff     |     h -hilighting         |  r -restore buf C's old diff
 116     j -jump to diff  |     @ -auto-refinement    |  * -refine current region
 117    gx -goto X's point|    ## -ignore whitespace  |  ! -update diff regions
 118   C-l -recenter      | #f/#h -focus/hide regions |  + -combine diff regions
 119   v/V -scroll up/dn  |     X -read-only in buf X | wx -save buf X
 120   </> -scroll lt/rt  |     m -wide display       | wd -save diff output
 121     ~ -swap variants |     s -shrink window C    |  / -show ancestor buff
 122                      |  $$ -show clashes only    |  & -merge w/new default
 123                      |  $* -skip changed regions |
 124 "
 125   "Help message for merge sessions.
 126 Normally, not a user option.  See `ediff-help-message' for details.")
 127
 128 ;; The actual long help message.
 129 (ediff-defvar-local ediff-long-help-message ""
 130   "Normally, not a user option.  See `ediff-help-message' for details.")
 131
 132 (defconst ediff-brief-message-string
 133   " ? -quick help "
 134   "Contents of the brief help message.")
 135 ;; The actual brief help message
 136 (ediff-defvar-local ediff-brief-help-message ""
 137   "Normally, not a user option.  See `ediff-help-message' for details.")
 138
 139 (ediff-defvar-local ediff-brief-help-message-function nil
 140   "The brief help message that the user can customize.
 141 If the user sets this to a parameter-less function, Ediff will use it to
 142 produce the brief help message.  This function must return a string.")
 143 (ediff-defvar-local ediff-long-help-message-function nil
 144   "The long help message that the user can customize.
 145 See `ediff-brief-help-message-function' for more.")
 146
 147 (defvar ediff-use-long-help-message nil
 148   "*If t, Ediff displays a long help message.  Short help message otherwise.")
 149
 150 ;; The actual help message.
 151 (ediff-defvar-local ediff-help-message ""
 152   "The actual help message.
 153 Normally, the user shouldn't touch this.  However, if you want Ediff to
 154 start up with different help messages for different jobs, you can change
 155 the value of this variable and the variables `ediff-help-message-*' in
 156 `ediff-startup-hook'.")
 157
 158
 159 ;; the keymap that defines clicks over the quick help regions
 160 (defvar ediff-help-region-map (make-sparse-keymap))
 161
 162 (define-key
 163   ediff-help-region-map
 164   (if ediff-emacs-p [mouse-2] [button2])
 165   'ediff-help-for-quick-help)
 166
 167 ;; runs in the control buffer
 168 (defun ediff-set-help-overlays ()
 169   (goto-char (point-min))
 170   (let (overl beg end cmd)
 171     (while (re-search-forward " *\\([^ \t\n|]+\\||\\) +-[^|\n]+" nil 'noerror)
 172       (setq beg (match-beginning 0)
 173             end (match-end 0)
 174             cmd (buffer-substring (match-beginning 1) (match-end 1)))
 175       (setq overl (ediff-make-overlay beg end))
 176       (if ediff-emacs-p
 177           (ediff-overlay-put overl 'mouse-face 'highlight)
 178         (ediff-overlay-put overl 'highlight t))
 179       (ediff-overlay-put overl 'ediff-help-info cmd))))
 180
 181
 182 (defun ediff-help-for-quick-help ()
 183   "Explain Ediff commands in more detail."
 184   (interactive)
 185   (ediff-barf-if-not-control-buffer)
 186   (let ((pos (ediff-event-point last-command-event))
 187         overl cmd)
 188
 189     (if ediff-xemacs-p
 190         (setq overl (extent-at pos (current-buffer) 'ediff-help-info)
 191               cmd   (ediff-overlay-get overl 'ediff-help-info))
 192       (setq cmd (car (mapcar (lambda (elt)
 193                                (overlay-get elt 'ediff-help-info))
 194                              (overlays-at pos)))))
 195
 196     (if (not (stringp cmd))
 197         (error "Hmm...  I don't see an Ediff command around here..."))
 198
 199     (ediff-documentation "Quick Help Commands")
 200
 201     (let (case-fold-search)
 202       (cond ((string= cmd "?") (re-search-forward "^`\\?'"))
 203             ((string= cmd "G") (re-search-forward "^`G'"))
 204             ((string= cmd "E") (re-search-forward "^`E'"))
 205             ((string= cmd "wd") (re-search-forward "^`wd'"))
 206             ((string= cmd "wx") (re-search-forward "^`wa'"))
 207             ((string= cmd "a/b") (re-search-forward "^`a'"))
 208             ((string= cmd "x") (re-search-forward "^`a'"))
 209             ((string= cmd "xy") (re-search-forward "^`ab'"))
 210             ((string= cmd "p,DEL") (re-search-forward "^`p'"))
 211             ((string= cmd "n,SPC") (re-search-forward "^`n'"))
 212             ((string= cmd "j") (re-search-forward "^`j'"))
 213             ((string= cmd "gx") (re-search-forward "^`ga'"))
 214             ((string= cmd "!") (re-search-forward "^`!'"))
 215             ((string= cmd "*") (re-search-forward "^`\\*'"))
 216             ((string= cmd "m") (re-search-forward "^`m'"))
 217             ((string= cmd "|") (re-search-forward "^`|'"))
 218             ((string= cmd "@") (re-search-forward "^`@'"))
 219             ((string= cmd "h") (re-search-forward "^`h'"))
 220             ((string= cmd "r") (re-search-forward "^`r'"))
 221             ((string= cmd "rx") (re-search-forward "^`ra'"))
 222             ((string= cmd "##") (re-search-forward "^`##'"))
 223             ((string= cmd "#f/#h") (re-search-forward "^`#f'"))
 224             ((string= cmd "X") (re-search-forward "^`A'"))
 225             ((string= cmd "v/V") (re-search-forward "^`v'"))
 226             ((string= cmd "</>") (re-search-forward "^`<'"))
 227             ((string= cmd "~") (re-search-forward "^`~'"))
 228             ((string= cmd "i") (re-search-forward "^`i'"))
 229             ((string= cmd "D") (re-search-forward "^`D'"))
 230             ((string= cmd "R") (re-search-forward "^`R'"))
 231             ((string= cmd "M") (re-search-forward "^`M'"))
 232             ((string= cmd "z/q") (re-search-forward "^`z'"))
 233             ((string= cmd "%") (re-search-forward "^`%'"))
 234             ((string= cmd "C-l") (re-search-forward "^`C-l'"))
 235             ((string= cmd "$$") (re-search-forward "^`\\$\\$'"))
 236             ((string= cmd "$*") (re-search-forward "^`\\$\\*'"))
 237             ((string= cmd "/") (re-search-forward "^`/'"))
 238             ((string= cmd "&") (re-search-forward "^`&'"))
 239             ((string= cmd "s") (re-search-forward "^`s'"))
 240             ((string= cmd "+") (re-search-forward "^`\\+'"))
 241             ((string= cmd "=") (re-search-forward "^`='"))
 242             (t (error "Undocumented command! Type `G' in Ediff Control Panel to drop a note to the Ediff maintainer")))
 243       ) ; let case-fold-search
 244     ))
 245
 246
 247 ;; assuming we are in control window, calculate length of the first line in
 248 ;; help message
 249 (defun ediff-help-message-line-length ()
 250   (save-excursion
 251     (goto-char (point-min))
 252     (if ediff-use-long-help-message
 253         (next-line 1))
 254     (end-of-line)
 255     (current-column)))
 256
 257
 258 (defun ediff-indent-help-message ()
 259   (let* ((shift (/ (max 0 (- (window-width (selected-window))
 260                              (ediff-help-message-line-length)))
 261                    2))
 262          (str (make-string shift ?\ )))
 263     (save-excursion
 264       (goto-char (point-min))
 265       (while (< (point) (point-max))
 266         (insert str)
 267         (beginning-of-line)
 268         (forward-line 1)))))
 269
 270
 271 ;; compose the help message as a string
 272 (defun ediff-set-help-message ()
 273   (setq ediff-long-help-message
 274         (cond ((and ediff-long-help-message-function
 275                     (or (symbolp ediff-long-help-message-function)
 276                         (consp ediff-long-help-message-function)))
 277                (funcall ediff-long-help-message-function))
 278               (ediff-word-mode
 279                (concat ediff-long-help-message-head
 280                        ediff-long-help-message-word-mode
 281                        ediff-long-help-message-tail))
 282               (ediff-narrow-job
 283                (concat ediff-long-help-message-head
 284                        ediff-long-help-message-narrow2
 285                        ediff-long-help-message-tail))
 286               (ediff-merge-job
 287                (concat ediff-long-help-message-head
 288                        ediff-long-help-message-merge
 289                        ediff-long-help-message-tail))
 290               (ediff-diff3-job
 291                (concat ediff-long-help-message-head
 292                        ediff-long-help-message-compare3
 293                        ediff-long-help-message-tail))
 294               (t
 295                (concat ediff-long-help-message-head
 296                        ediff-long-help-message-compare2
 297                        ediff-long-help-message-tail))))
 298   (setq ediff-brief-help-message
 299         (cond ((and ediff-brief-help-message-function
 300                     (or (symbolp ediff-brief-help-message-function)
 301                         (consp ediff-brief-help-message-function)))
 302                (funcall ediff-brief-help-message-function))
 303               ((stringp ediff-brief-help-message-function)
 304                ediff-brief-help-message-function)
 305               ((ediff-multiframe-setup-p) ediff-brief-message-string)
 306               (t ; long brief msg, not multiframe --- put in the middle
 307                ediff-brief-message-string)
 308               ))
 309   (setq ediff-help-message (if ediff-use-long-help-message
 310                                ediff-long-help-message
 311                              ediff-brief-help-message))
 312   (run-hooks 'ediff-display-help-hook))
 313
 314 ;;;###autoload
 315 (defun ediff-customize ()
 316   (interactive)
 317   (customize-group "ediff"))
 318
 319
 320 ;;; ediff-help.el ends here