lisp/finder.el

   1 ;;; finder.el --- topic & keyword-based code finder
   2
   3 ;; Copyright (C) 1992, 1997, 1998, 1999, 2001, 2002, 2003,
   4 ;;   2004, 2005, 2006 Free Software Foundation, Inc.
   5
   6 ;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
   7 ;; Created: 16 Jun 1992
   8 ;; Version: 1.0
   9 ;; Keywords: help
  10
  11 ;; This file is part of GNU Emacs.
  12
  13 ;; GNU Emacs is free software; you can redistribute it and/or modify
  14 ;; it under the terms of the GNU General Public License as published by
  15 ;; the Free Software Foundation; either version 2, or (at your option)
  16 ;; any later version.
  17
  18 ;; GNU Emacs is distributed in the hope that it will be useful,
  19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 ;; GNU General Public License for more details.
  22
  23 ;; You should have received a copy of the GNU General Public License
  24 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  25 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  26 ;; Boston, MA 02110-1301, USA.
  27
  28 ;;; Commentary:
  29
  30 ;; This mode uses the Keywords library header to provide code-finding
  31 ;; services by keyword.
  32 ;;
  33 ;; Things to do:
  34 ;;    1. Support multiple keywords per search.  This could be extremely hairy;
  35 ;; there doesn't seem to be any way to get completing-read to exit on
  36 ;; an EOL with no substring pending, which is what we'd want to end the loop.
  37 ;;    2. Search by string in synopsis line?
  38 ;;    3. Function to check finder-package-info for unknown keywords.
  39
  40 ;;; Code:
  41
  42 (require 'lisp-mnt)
  43 (require 'find-func)                    ;for find-library(-suffixes)
  44 ;; Use `load' rather than `require' so that it doesn't get loaded
  45 ;; during byte-compilation (at which point it might be missing).
  46 (load "finder-inf" t t)
  47
  48 (defvar finder-mode-hook nil
  49   "*Hook run when function `finder-mode' is called.")
  50
  51 ;; Local variable in finder buffer.
  52 (defvar finder-headmark)
  53
  54 ;; These are supposed to correspond to top-level customization groups,
  55 ;; says rms.
  56 (defvar finder-known-keywords
  57   '(
  58     (abbrev     . "abbreviation handling, typing shortcuts, macros")
  59     ;; Too specific:
  60     (bib        . "code related to the `bib' bibliography processor")
  61     (c          . "support for the C language and related languages")
  62     (calendar   . "calendar and time management support")
  63     (comm       . "communications, networking, remote access to files")
  64     (convenience . "convenience features for faster editing")
  65     (data       . "support for editing files of data")
  66     (docs       . "support for Emacs documentation")
  67     (emulations . "emulations of other editors")
  68     (extensions . "Emacs Lisp language extensions")
  69     (faces      . "support for multiple fonts")
  70     (files      . "support for editing and manipulating files")
  71     (frames     . "support for Emacs frames and window systems")
  72     (games      . "games, jokes and amusements")
  73     (hardware   . "support for interfacing with exotic hardware")
  74     (help       . "support for on-line help systems")
  75     (hypermedia . "support for links between text or other media types")
  76     (i18n       . "internationalization and alternate character-set support")
  77     (internal   . "code for Emacs internals, build process, defaults")
  78     (languages  . "specialized modes for editing programming languages")
  79     (lisp       . "Lisp support, including Emacs Lisp")
  80     (local      . "code local to your site")
  81     (maint      . "maintenance aids for the Emacs development group")
  82     (mail       . "modes for electronic-mail handling")
  83     (matching   . "various sorts of searching and matching")
  84     (mouse      . "mouse support")
  85     (multimedia . "images and sound support")
  86     (news       . "support for netnews reading and posting")
  87     (oop        . "support for object-oriented programming")
  88     (outlines   . "support for hierarchical outlining")
  89     (processes  . "process, subshell, compilation, and job control support")
  90     (terminals  . "support for terminal types")
  91     (tex        . "supporting code for the TeX formatter")
  92     (tools      . "programming tools")
  93     (unix       . "front-ends/assistants for, or emulators of, UNIX-like features")
  94 ;; Not a custom group and not currently useful.
  95 ;;    (vms      . "support code for vms")
  96     (wp         . "word processing")
  97     ))
  98
  99 (defvar finder-mode-map
 100   (let ((map (make-sparse-keymap)))
 101     (define-key map " " 'finder-select)
 102     (define-key map "f" 'finder-select)
 103     (define-key map [follow-link] 'mouse-face)
 104     (define-key map [mouse-2]   'finder-mouse-select)
 105     (define-key map "\C-m"      'finder-select)
 106     (define-key map "?" 'finder-summary)
 107     (define-key map "n" 'next-line)
 108     (define-key map "p" 'previous-line)
 109     (define-key map "q" 'finder-exit)
 110     (define-key map "d" 'finder-list-keywords)
 111     map))
 112
 113
 114 ;;; Code for regenerating the keyword list.
 115
 116 (defvar finder-package-info nil
 117   "Assoc list mapping file names to description & keyword lists.")
 118
 119 (defvar generated-finder-keywords-file "finder-inf.el"
 120   "File \\[finder-compile-keywords] puts finder keywords into.")
 121
 122 (defun finder-compile-keywords (&rest dirs)
 123   "Regenerate the keywords association list into `generated-finder-keywords-file'.
 124 Optional arguments DIRS are a list of Emacs Lisp directories to compile from;
 125 no arguments compiles from `load-path'."
 126   (save-excursion
 127     (let ((processed nil))
 128       (find-file generated-finder-keywords-file)
 129       (erase-buffer)
 130       (insert ";;; " (file-name-nondirectory generated-finder-keywords-file)
 131               " --- keyword-to-package mapping\n")
 132       (insert ";; This file is part of GNU Emacs.\n")
 133       (insert ";;; Commentary:\n")
 134       (insert ";; Don't edit this file.  It's generated by finder.el\n\n")
 135       (insert ";;; Code:\n")
 136       (insert "\n(setq finder-package-info '(\n")
 137       (mapcar
 138        (lambda (d)
 139          (when (file-exists-p (directory-file-name d))
 140            (message "Directory %s" d)
 141            (mapcar
 142             (lambda (f)
 143               (if (and (or (string-match "^[^=].*\\.el$" f)
 144                            ;; Allow compressed files also.  Fixme:
 145                            ;; generalize this, especially for
 146                            ;; MS-DOG-type filenames.
 147                            (and (string-match "^[^=].*\\.el\\.\\(gz\\|Z\\)$" f)
 148                                 (require 'jka-compr)))
 149                        ;; Ignore lock files.
 150                        (not (string-match "^.#" f))
 151                        (not (member f processed)))
 152                   (let (summary keystart keywords)
 153                     (setq processed (cons f processed))
 154                     (save-excursion
 155                       (set-buffer (get-buffer-create "*finder-scratch*"))
 156                       (buffer-disable-undo (current-buffer))
 157                       (erase-buffer)
 158                       (insert-file-contents
 159                        (concat (file-name-as-directory (or d ".")) f))
 160                       (setq summary (lm-synopsis))
 161                       (setq keywords (lm-keywords)))
 162                     (insert
 163                      (format "    (\"%s\"\n        "
 164                              (if (string-match "\\.\\(gz\\|Z\\)$" f)
 165                                  (file-name-sans-extension f)
 166                                f)))
 167                     (prin1 summary (current-buffer))
 168                     (insert
 169                      "\n        ")
 170                     (setq keystart (point))
 171                     (insert
 172                      (if keywords (format "(%s)" keywords) "nil")
 173                      ")\n")
 174                     (subst-char-in-region keystart (point) ?, ? )
 175                     )))
 176             (directory-files (or d ".")))))
 177        (or dirs load-path))
 178       (insert "))\n
 179 \(provide '" (file-name-sans-extension
 180               (file-name-nondirectory generated-finder-keywords-file)) ")
 181
 182 ;;; Local Variables:
 183 ;;; version-control: never
 184 ;;; no-byte-compile: t
 185 ;;; no-update-autoloads: t
 186 ;;; End:
 187 ;;; " (file-name-nondirectory generated-finder-keywords-file) " ends here\n")
 188       (kill-buffer "*finder-scratch*")
 189       (eval-buffer) ;; So we get the new keyword list immediately
 190       (basic-save-buffer))))
 191
 192 (defun finder-compile-keywords-make-dist ()
 193   "Regenerate `finder-inf.el' for the Emacs distribution."
 194   (apply 'finder-compile-keywords command-line-args-left)
 195   (kill-emacs))
 196
 197 ;;; Now the retrieval code
 198
 199 (defun finder-insert-at-column (column &rest strings)
 200   "Insert, at column COLUMN, other args STRINGS."
 201   (if (>= (current-column) column) (insert "\n"))
 202   (move-to-column column t)
 203   (apply 'insert strings))
 204
 205 (defvar finder-help-echo nil)
 206
 207 (defun finder-mouse-face-on-line ()
 208   "Put `mouse-face' and `help-echo' properties on the previous line."
 209   (save-excursion
 210     (previous-line 1)
 211     (unless finder-help-echo
 212       (setq finder-help-echo
 213             (let* ((keys1 (where-is-internal 'finder-select
 214                                              finder-mode-map))
 215                    (keys (nconc (where-is-internal
 216                                  'finder-mouse-select finder-mode-map)
 217                                 keys1)))
 218               (concat (mapconcat 'key-description keys ", ")
 219                       ": select item"))))
 220     (add-text-properties
 221      (line-beginning-position) (line-end-position)
 222      '(mouse-face highlight
 223                   help-echo finder-help-echo))))
 224
 225 ;;;###autoload
 226 (defun finder-list-keywords ()
 227   "Display descriptions of the keywords in the Finder buffer."
 228   (interactive)
 229   (if (get-buffer "*Finder*")
 230       (pop-to-buffer "*Finder*")
 231     (pop-to-buffer (set-buffer (get-buffer-create "*Finder*")))
 232     (finder-mode)
 233     (setq buffer-read-only nil)
 234     (erase-buffer)
 235     (mapc
 236      (lambda (assoc)
 237        (let ((keyword (car assoc)))
 238          (insert (symbol-name keyword))
 239          (finder-insert-at-column 14 (concat (cdr assoc) "\n"))
 240          (finder-mouse-face-on-line)))
 241      finder-known-keywords)
 242     (goto-char (point-min))
 243     (setq finder-headmark (point))
 244     (setq buffer-read-only t)
 245     (set-buffer-modified-p nil)
 246     (balance-windows)
 247     (finder-summary)))
 248
 249 (defun finder-list-matches (key)
 250   (pop-to-buffer (set-buffer (get-buffer-create "*Finder Category*")))
 251   (finder-mode)
 252   (setq buffer-read-only nil)
 253   (erase-buffer)
 254   (let ((id (intern key)))
 255     (insert
 256      "The following packages match the keyword `" key "':\n\n")
 257     (setq finder-headmark (point))
 258     (mapc
 259      (lambda (x)
 260        (if (memq id (car (cdr (cdr x))))
 261            (progn
 262              (insert (car x))
 263              (finder-insert-at-column 16 (concat (nth 1 x) "\n"))
 264              (finder-mouse-face-on-line))))
 265      finder-package-info)
 266     (goto-char (point-min))
 267     (forward-line)
 268     (setq buffer-read-only t)
 269     (set-buffer-modified-p nil)
 270     (shrink-window-if-larger-than-buffer)
 271     (finder-summary)))
 272
 273 ;;;###autoload
 274 (defun finder-commentary (file)
 275   "Display FILE's commentary section.
 276 FILE should be in a form suitable for passing to `locate-library'."
 277   (interactive
 278    (list
 279     (completing-read "Library name: "
 280                      'locate-file-completion
 281                      (cons (or find-function-source-path load-path)
 282                            (find-library-suffixes)))))
 283   (let* ((str (lm-commentary (find-library-name file))))
 284     (if (null str)
 285         (error "Can't find any Commentary section"))
 286     ;; This used to use *Finder* but that would clobber the
 287     ;; directory of categories.
 288     (delete-other-windows)
 289     (pop-to-buffer "*Finder-package*")
 290     (setq buffer-read-only nil)
 291     (erase-buffer)
 292     (insert str)
 293     (goto-char (point-min))
 294     (delete-blank-lines)
 295     (goto-char (point-max))
 296     (delete-blank-lines)
 297     (goto-char (point-min))
 298     (while (re-search-forward "^;+ ?" nil t)
 299       (replace-match "" nil nil))
 300     (goto-char (point-min))
 301     (setq buffer-read-only t)
 302     (set-buffer-modified-p nil)
 303     (shrink-window-if-larger-than-buffer)
 304     (finder-mode)
 305     (finder-summary)))
 306
 307 (defun finder-current-item ()
 308   (let ((key (save-excursion
 309                (beginning-of-line)
 310                (current-word))))
 311     (if (or (and finder-headmark (< (point) finder-headmark))
 312             (= (length key) 0))
 313         (error "No keyword or filename on this line")
 314       key)))
 315
 316 (defun finder-select ()
 317   "Select item on current line in a finder buffer."
 318   (interactive)
 319   (let ((key (finder-current-item)))
 320       (if (string-match "\\.el$" key)
 321           (finder-commentary key)
 322         (finder-list-matches key))))
 323
 324 (defun finder-mouse-select (event)
 325   "Select item in a finder buffer with the mouse."
 326   (interactive "e")
 327   (save-excursion
 328     (set-buffer (window-buffer (posn-window (event-start event))))
 329     (goto-char (posn-point (event-start event)))
 330     (finder-select)))
 331
 332 ;;;###autoload
 333 (defun finder-by-keyword ()
 334   "Find packages matching a given keyword."
 335   (interactive)
 336   (finder-list-keywords))
 337
 338 (defun finder-mode ()
 339   "Major mode for browsing package documentation.
 340 \\<finder-mode-map>
 341 \\[finder-select]       more help for the item on the current line
 342 \\[finder-exit] exit Finder mode and kill the Finder buffer."
 343   (interactive)
 344   (kill-all-local-variables)
 345   (use-local-map finder-mode-map)
 346   (set-syntax-table emacs-lisp-mode-syntax-table)
 347   (setq mode-name "Finder")
 348   (setq major-mode 'finder-mode)
 349   (set (make-local-variable 'finder-headmark) nil)
 350   (run-mode-hooks 'finder-mode-hook))
 351
 352 (defun finder-summary ()
 353   "Summarize basic Finder commands."
 354   (interactive)
 355   (message "%s"
 356    (substitute-command-keys
 357     "\\<finder-mode-map>\\[finder-select] = select, \
 358 \\[finder-mouse-select] = select, \\[finder-list-keywords] = to \
 359 finder directory, \\[finder-exit] = quit, \\[finder-summary] = help")))
 360
 361 (defun finder-exit ()
 362   "Exit Finder mode and kill the buffer."
 363   (interactive)
 364   (or (one-window-p t)
 365       (delete-window))
 366   ;; Can happen in either buffer -- kill each of the two that exists
 367   (and (get-buffer "*Finder*")
 368        (kill-buffer "*Finder*"))
 369   (and (get-buffer "*Finder Category*")
 370        (kill-buffer "*Finder Category*")))
 371
 372 \f
 373 (provide 'finder)
 374
 375 ;;; arch-tag: ec85ff49-8cb8-41f5-a63f-9131d53ce2c5
 376 ;;; finder.el ends here