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 ;;; Commentary:
  25
  26 ;;; Code:
  27
  28 (provide 'ediff-help)
  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 nil '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|                           |  ! -update diff regions
  64   C-l -recenter      |    ## -ignore whitespace  |
  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|                           |  ! -update diff regions
  78   C-l -recenter      |    ## -ignore whitespace  |
  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|     % -narrow/widen buffs |  ! -update diff regions
  92   C-l -recenter      |    ## -ignore whitespace  |
  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      |                           |
 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   " ? -quick 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 ediff-emacs-p [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 ediff-emacs-p
 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 ediff-xemacs-p
 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 "#f/#h") (re-search-forward "^`#f'"))
 228             ((string= cmd "X") (re-search-forward "^`A'"))
 229             ((string= cmd "v/V") (re-search-forward "^`v'"))
 230             ((string= cmd "</>") (re-search-forward "^`<'"))
 231             ((string= cmd "~") (re-search-forward "^`~'"))
 232             ((string= cmd "i") (re-search-forward "^`i'"))
 233             ((string= cmd "D") (re-search-forward "^`D'"))
 234             ((string= cmd "R") (re-search-forward "^`R'"))
 235             ((string= cmd "M") (re-search-forward "^`M'"))
 236             ((string= cmd "z/q") (re-search-forward "^`z'"))
 237             ((string= cmd "%") (re-search-forward "^`%'"))
 238             ((string= cmd "C-l") (re-search-forward "^`C-l'"))
 239             ((string= cmd "$$") (re-search-forward "^`\\$\\$'"))
 240             ((string= cmd "$*") (re-search-forward "^`\\$\\*'"))
 241             ((string= cmd "/") (re-search-forward "^`/'"))
 242             ((string= cmd "&") (re-search-forward "^`&'"))
 243             ((string= cmd "s") (re-search-forward "^`s'"))
 244             ((string= cmd "+") (re-search-forward "^`\\+'"))
 245             ((string= cmd "=") (re-search-forward "^`='"))
 246             (t (error "Undocumented command! Type `G' in Ediff Control Panel to drop a note to the Ediff maintainer")))
 247       ) ; let case-fold-search
 248     ))
 249
 250
 251 ;; assuming we are in control window, calculate length of the first line in
 252 ;; help message
 253 (defun ediff-help-message-line-length ()
 254   (save-excursion
 255     (goto-char (point-min))
 256     (if ediff-use-long-help-message
 257         (next-line 1))
 258     (end-of-line)
 259     (current-column)))
 260
 261
 262 (defun ediff-indent-help-message ()
 263   (let* ((shift (/ (max 0 (- (window-width (selected-window))
 264                              (ediff-help-message-line-length)))
 265                    2))
 266          (str (make-string shift ?\ )))
 267     (save-excursion
 268       (goto-char (point-min))
 269       (while (< (point) (point-max))
 270         (insert str)
 271         (beginning-of-line)
 272         (forward-line 1)))))
 273
 274
 275 ;; compose the help message as a string
 276 (defun ediff-set-help-message ()
 277   (setq ediff-long-help-message
 278         (cond ((and ediff-long-help-message-function
 279                     (or (symbolp ediff-long-help-message-function)
 280                         (consp ediff-long-help-message-function)))
 281                (funcall ediff-long-help-message-function))
 282               (ediff-word-mode
 283                (concat ediff-long-help-message-head
 284                        ediff-long-help-message-word-mode
 285                        ediff-long-help-message-tail))
 286               (ediff-narrow-job
 287                (concat ediff-long-help-message-head
 288                        ediff-long-help-message-narrow2
 289                        ediff-long-help-message-tail))
 290               (ediff-merge-job
 291                (concat ediff-long-help-message-head
 292                        ediff-long-help-message-merge
 293                        ediff-long-help-message-tail))
 294               (ediff-diff3-job
 295                (concat ediff-long-help-message-head
 296                        ediff-long-help-message-compare3
 297                        ediff-long-help-message-tail))
 298               (t
 299                (concat ediff-long-help-message-head
 300                        ediff-long-help-message-compare2
 301                        ediff-long-help-message-tail))))
 302   (setq ediff-brief-help-message
 303         (cond ((and ediff-brief-help-message-function
 304                     (or (symbolp ediff-brief-help-message-function)
 305                         (consp ediff-brief-help-message-function)))
 306                (funcall ediff-brief-help-message-function))
 307               ((stringp ediff-brief-help-message-function)
 308                ediff-brief-help-message-function)
 309               ((ediff-multiframe-setup-p) ediff-brief-message-string)
 310               (t ; long brief msg, not multiframe --- put in the middle
 311                ediff-brief-message-string)
 312               ))
 313   (setq ediff-help-message (if ediff-use-long-help-message
 314                                ediff-long-help-message
 315                              ediff-brief-help-message))
 316   (run-hooks 'ediff-display-help-hook))
 317
 318 ;;;###autoload
 319 (defun ediff-customize ()
 320   (interactive)
 321   (customize-group "ediff"))
 322
 323
 324 ;;; ediff-help.el ends here