lisp/finder.el

   1 ;;; finder.el --- topic & keyword-based code finder
   2
   3 ;; Copyright (C) 1992, 1997, 1998, 1999 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
   6 ;; Created: 16 Jun 1992
   7 ;; Version: 1.0
   8 ;; Keywords: help
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software; you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation; either version 2, or (at your option)
  15 ;; any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  25 ;; Boston, MA 02111-1307, USA.
  26
  27 ;;; Commentary:
  28
  29 ;; This mode uses the Keywords library header to provide code-finding
  30 ;; services by keyword.
  31 ;;
  32 ;; Things to do:
  33 ;;    1. Support multiple keywords per search.  This could be extremely hairy;
  34 ;; there doesn't seem to be any way to get completing-read to exit on
  35 ;; an EOL with no substring pending, which is what we'd want to end the loop.
  36 ;;    2. Search by string in synopsis line?
  37 ;;    3. Function to check finder-package-info for unknown keywords.
  38
  39 ;;; Code:
  40
  41 (require 'lisp-mnt)
  42 (require 'finder-inf)
  43
  44 ;; Local variable in finder buffer.
  45 (defvar finder-headmark)
  46
  47 ;; These are supposed to correspond to top-level customization groups,
  48 ;; says rms.
  49 (defvar finder-known-keywords
  50   '(
  51     (abbrev     . "abbreviation handling, typing shortcuts, macros")
  52     (bib        . "code related to the `bib' bibliography processor")
  53     (c          . "support for the C language and related languages")
  54     (calendar   . "calendar and time management support")
  55     (comm       . "communications, networking, remote access to files")
  56     (convenience . "convenience features for faster editing")
  57     (data       . "support editing files of data")
  58     (docs       . "support for Emacs documentation")
  59     (emulations . "emulations of other editors")
  60     (extensions . "Emacs Lisp language extensions")
  61     (faces      . "support for multiple fonts")
  62     (frames     . "support for Emacs frames and window systems")
  63     (games      . "games, jokes and amusements")
  64     (hardware   . "support for interfacing with exotic hardware")
  65     (help       . "support for on-line help systems")
  66     (hypermedia . "support for links between text or other media types")
  67     (i18n       . "internationalization and alternate character-set support")
  68     (internal   . "code for Emacs internals, build process, defaults")
  69     (languages  . "specialized modes for editing programming languages")
  70     (lisp       . "Lisp support, including Emacs Lisp")
  71     (local      . "code local to your site")
  72     (maint      . "maintenance aids for the Emacs development group")
  73     (mail       . "modes for electronic-mail handling")
  74     (matching   . "various sorts of searching and matching")
  75     (mouse      . "mouse support")
  76     (multimedia . "images and sound support")
  77     (news       . "support for netnews reading and posting")
  78     (oop        . "support for object-oriented programming")
  79     (outlines   . "support for hierarchical outlining")
  80     (processes  . "process, subshell, compilation, and job control support")
  81     (terminals  . "support for terminal types")
  82     (tex        . "code related to the TeX formatter")
  83     (tools      . "programming tools")
  84     (unix       . "front-ends/assistants for, or emulators of, UNIX features")
  85     (vms        . "support code for vms")
  86     (wp         . "word processing")
  87     ))
  88
  89 (defvar finder-mode-map nil)
  90 (or finder-mode-map
  91     (let ((map (make-sparse-keymap)))
  92       (define-key map " "       'finder-select)
  93       (define-key map "f"       'finder-select)
  94       (define-key map [mouse-2] 'finder-mouse-select)
  95       (define-key map "\C-m"    'finder-select)
  96       (define-key map "?"       'finder-summary)
  97       (define-key map "q"       'finder-exit)
  98       (define-key map "d"       'finder-list-keywords)
  99       (setq finder-mode-map map)))
 100
 101
 102 ;;; Code for regenerating the keyword list.
 103
 104 (defvar finder-package-info nil
 105   "Assoc list mapping file names to description & keyword lists.")
 106
 107 (defun finder-compile-keywords (&rest dirs)
 108   "Regenerate the keywords association list into the file `finder-inf.el'.
 109 Optional arguments DIRS are a list of Emacs Lisp directories to compile from;
 110 no arguments compiles from `load-path'."
 111   (save-excursion
 112     (let ((processed nil))
 113       (find-file "finder-inf.el")
 114       (erase-buffer)
 115       (insert ";;; finder-inf.el --- keyword-to-package mapping\n")
 116       (insert ";; Keywords: help\n")
 117       (insert ";;; Commentary:\n")
 118       (insert ";; Don't edit this file.  It's generated by finder.el\n\n")
 119       (insert ";;; Code:\n")
 120       (insert "\n(setq finder-package-info '(\n")
 121       (mapcar
 122        (lambda (d)
 123          (when (file-exists-p (directory-file-name d))
 124            (message "Directory %s" d)
 125            (mapcar
 126             (lambda (f)
 127               (if (and (or (string-match "^[^=].*\\.el$" f)
 128                            ;; Allow compressed files also.  Fixme:
 129                            ;; generalize this, especially for
 130                            ;; MS-DOG-type filenames.
 131                            (and (string-match "^[^=].*\\.el\\.\\(gz\\|Z\\)$" f)
 132                                 (require 'jka-compr)))
 133                        ;; Ignore lock files.
 134                        (not (string-match "^.#" f))
 135                        (not (member f processed)))
 136                   (let (summary keystart keywords)
 137                     (setq processed (cons f processed))
 138                     (save-excursion
 139                       (set-buffer (get-buffer-create "*finder-scratch*"))
 140                       (buffer-disable-undo (current-buffer))
 141                       (erase-buffer)
 142                       (insert-file-contents
 143                        (concat (file-name-as-directory (or d ".")) f))
 144                       (setq summary (lm-synopsis))
 145                       (setq keywords (lm-keywords)))
 146                     (insert
 147                      (format "    (\"%s\"\n        "
 148                              (if (string-match "\\.\\(gz\\|Z\\)$" f)
 149                                  (file-name-sans-extension f)
 150                                f)))
 151                     (prin1 summary (current-buffer))
 152                     (insert
 153                      "\n        ")
 154                     (setq keystart (point))
 155                     (insert
 156                      (if keywords (format "(%s)" keywords) "nil")
 157                      ")\n")
 158                     (subst-char-in-region keystart (point) ?, ? )
 159                     )))
 160             (directory-files (or d ".")))))
 161        (or dirs load-path))
 162       (insert "))\n
 163 \(provide 'finder-inf)
 164
 165 ;;; Local Variables:
 166 ;;; version-control: never
 167 ;;; no-byte-compile: t
 168 ;;; no-update-autoloads: t
 169 ;;; End:
 170 ;;; finder-inf.el ends here\n")
 171       (kill-buffer "*finder-scratch*")
 172       (eval-current-buffer) ;; So we get the new keyword list immediately
 173       (basic-save-buffer))))
 174
 175 (defun finder-compile-keywords-make-dist ()
 176   "Regenerate `finder-inf.el' for the Emacs distribution."
 177   (apply 'finder-compile-keywords command-line-args-left)
 178   (kill-emacs))
 179
 180 ;;; Now the retrieval code
 181
 182 (defun finder-insert-at-column (column &rest strings)
 183   "Insert, at column COLUMN, other args STRINGS."
 184   (if (> (current-column) column) (insert "\n"))
 185   (move-to-column column t)
 186   (apply 'insert strings))
 187
 188 (defun finder-mouse-face-on-line ()
 189   "Put a `mouse-face' property on the previous line."
 190   (save-excursion
 191     (previous-line 1)
 192     (put-text-property (save-excursion (beginning-of-line) (point))
 193                        (progn (end-of-line) (point))
 194                        'mouse-face 'highlight)))
 195
 196 ;;;###autoload
 197 (defun finder-list-keywords ()
 198   "Display descriptions of the keywords in the Finder buffer."
 199   (interactive)
 200   (if (get-buffer "*Finder*")
 201       (pop-to-buffer "*Finder*")
 202     (pop-to-buffer (set-buffer (get-buffer-create "*Finder*")))
 203     (finder-mode)
 204     (setq buffer-read-only nil)
 205     (erase-buffer)
 206     (mapcar
 207      (lambda (assoc)
 208        (let ((keyword (car assoc)))
 209          (insert (symbol-name keyword))
 210          (finder-insert-at-column 14 (concat (cdr assoc) "\n"))
 211          (finder-mouse-face-on-line)))
 212      finder-known-keywords)
 213     (goto-char (point-min))
 214     (setq finder-headmark (point))
 215     (setq buffer-read-only t)
 216     (set-buffer-modified-p nil)
 217     (balance-windows)
 218     (finder-summary)))
 219
 220 (defun finder-list-matches (key)
 221   (pop-to-buffer (set-buffer (get-buffer-create "*Finder Category*")))
 222   (finder-mode)
 223   (setq buffer-read-only nil)
 224   (erase-buffer)
 225   (let ((id (intern key)))
 226     (insert
 227      "The following packages match the keyword `" key "':\n\n")
 228     (setq finder-headmark (point))
 229     (mapcar
 230      (lambda (x)
 231        (if (memq id (car (cdr (cdr x))))
 232            (progn
 233              (insert (car x))
 234              (finder-insert-at-column 16 (concat (nth 1 x) "\n"))
 235              (finder-mouse-face-on-line))))
 236      finder-package-info)
 237     (goto-char (point-min))
 238     (forward-line)
 239     (setq buffer-read-only t)
 240     (set-buffer-modified-p nil)
 241     (shrink-window-if-larger-than-buffer)
 242     (finder-summary)))
 243
 244 (defun finder-find-library (library)
 245   "Search for file LIBRARY on `load-path'.
 246 Try compressed versions if jka-compr is in use."
 247   (or (locate-library library t)
 248       (if (rassq 'jka-compr-handler file-name-handler-alist)
 249         (or (locate-library (concat library ".gz") t)
 250             (locate-library (concat library ".Z") t)
 251             ;; last resort for MS-DOG et al
 252             (locate-library (concat library "z"))))))
 253
 254 ;;;###autoload
 255 (defun finder-commentary (file)
 256   "Display FILE's commentary section.
 257 FILE should be in a form suitable for passing to `locate-library'."
 258   (interactive "sLibrary name: ")
 259   (let* ((str (lm-commentary (or (finder-find-library file)
 260                                  (finder-find-library (concat file ".el"))
 261                                  (error "Can't find library %s" file)))))
 262     (if (null str)
 263         (error "Can't find any Commentary section"))
 264     (pop-to-buffer "*Finder*")
 265     (setq buffer-read-only nil)
 266     (erase-buffer)
 267     (insert str)
 268     (goto-char (point-min))
 269     (delete-blank-lines)
 270     (goto-char (point-max))
 271     (delete-blank-lines)
 272     (goto-char (point-min))
 273     (while (re-search-forward "^;+ ?" nil t)
 274       (replace-match "" nil nil))
 275     (goto-char (point-min))
 276     (setq buffer-read-only t)
 277     (set-buffer-modified-p nil)
 278     (shrink-window-if-larger-than-buffer)
 279     (finder-mode)
 280     (finder-summary)))
 281
 282 (defun finder-current-item ()
 283   (if (and finder-headmark (< (point) finder-headmark))
 284       (error "No keyword or filename on this line")
 285     (save-excursion
 286       (beginning-of-line)
 287       (current-word))))
 288
 289 (defun finder-select ()
 290   "Select item on current line in a finder buffer."
 291   (interactive)
 292   (let ((key (finder-current-item)))
 293       (if (string-match "\\.el$" key)
 294           (finder-commentary key)
 295         (finder-list-matches key))))
 296
 297 (defun finder-mouse-select (event)
 298   "Select item in a finder buffer with the mouse."
 299   (interactive "e")
 300   (save-excursion
 301     (set-buffer (window-buffer (posn-window (event-start event))))
 302     (goto-char (posn-point (event-start event)))
 303     (finder-select)))
 304
 305 ;;;###autoload
 306 (defun finder-by-keyword ()
 307   "Find packages matching a given keyword."
 308   (interactive)
 309   (finder-list-keywords))
 310
 311 (defun finder-mode ()
 312   "Major mode for browsing package documentation.
 313 \\<finder-mode-map>
 314 \\[finder-select]       more help for the item on the current line
 315 \\[finder-exit] exit Finder mode and kill the Finder buffer."
 316   (interactive)
 317   (use-local-map finder-mode-map)
 318   (set-syntax-table emacs-lisp-mode-syntax-table)
 319   (setq mode-name "Finder")
 320   (setq major-mode 'finder-mode)
 321   (make-local-variable 'finder-headmark)
 322   (setq finder-headmark nil))
 323
 324 (defun finder-summary ()
 325   "Summarize basic Finder commands."
 326   (interactive)
 327   (message "%s"
 328    (substitute-command-keys
 329     "\\<finder-mode-map>\\[finder-select] = select, \
 330 \\[finder-mouse-select] = select, \\[finder-list-keywords] = to \
 331 finder directory, \\[finder-exit] = quit, \\[finder-summary] = help")))
 332
 333 (defun finder-exit ()
 334   "Exit Finder mode and kill the buffer."
 335   (interactive)
 336   (or (one-window-p t)
 337       (delete-window))
 338   ;; Can happen in either buffer -- kill each of the two that exists
 339   (and (get-buffer "*Finder*")
 340        (kill-buffer "*Finder*"))
 341   (and (get-buffer "*Finder Category*")
 342        (kill-buffer "*Finder Category*")))
 343
 344 \f
 345 (provide 'finder)
 346
 347 ;;; finder.el ends here