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, 2007, 2008 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 3, 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 (defvar finder-mode-syntax-table
 114   (let ((st (make-syntax-table emacs-lisp-mode-syntax-table)))
 115     (modify-syntax-entry ?\; ".   " st)
 116     st)
 117   "Syntax table used while in `finder-mode'.")
 118
 119 (defvar finder-font-lock-keywords
 120   '(("`\\([^']+\\)'" 1 font-lock-constant-face prepend))
 121   "Font-lock keywords for Finder mode.")
 122
 123
 124 ;;; Code for regenerating the keyword list.
 125
 126 (defvar finder-package-info nil
 127   "Assoc list mapping file names to description & keyword lists.")
 128
 129 (defvar generated-finder-keywords-file "finder-inf.el"
 130   "File \\[finder-compile-keywords] puts finder keywords into.")
 131
 132 (defun finder-compile-keywords (&rest dirs)
 133   "Regenerate the keywords association list into `generated-finder-keywords-file'.
 134 Optional arguments DIRS are a list of Emacs Lisp directories to compile from;
 135 no arguments compiles from `load-path'."
 136   (save-excursion
 137     (let ((processed nil))
 138       (find-file generated-finder-keywords-file)
 139       (erase-buffer)
 140       (insert ";;; " (file-name-nondirectory generated-finder-keywords-file)
 141               " --- keyword-to-package mapping\n")
 142       (insert ";; This file is part of GNU Emacs.\n")
 143       (insert ";;; Commentary:\n")
 144       (insert ";; Don't edit this file.  It's generated by finder.el\n\n")
 145       (insert ";;; Code:\n")
 146       (insert "\n(setq finder-package-info '(\n")
 147       (mapc
 148        (lambda (d)
 149          (when (file-exists-p (directory-file-name d))
 150            (message "Directory %s" d)
 151            (mapcar
 152             (lambda (f)
 153               (if (and (or (string-match "^[^=].*\\.el$" f)
 154                            ;; Allow compressed files also.  Fixme:
 155                            ;; generalize this, especially for
 156                            ;; MS-DOG-type filenames.
 157                            (and (string-match "^[^=].*\\.el\\.\\(gz\\|Z\\)$" f)
 158                                 (require 'jka-compr)))
 159                        ;; Ignore lock files.
 160                        (not (string-match "^.#" f))
 161                        (not (member f processed)))
 162                   (let (summary keystart keywords)
 163                     (setq processed (cons f processed))
 164                     (save-excursion
 165                       (set-buffer (get-buffer-create "*finder-scratch*"))
 166                       (buffer-disable-undo (current-buffer))
 167                       (erase-buffer)
 168                       (insert-file-contents
 169                        (concat (file-name-as-directory (or d ".")) f))
 170                       (setq summary (lm-synopsis))
 171                       (setq keywords (lm-keywords)))
 172                     (insert
 173                      (format "    (\"%s\"\n        "
 174                              (if (string-match "\\.\\(gz\\|Z\\)$" f)
 175                                  (file-name-sans-extension f)
 176                                f)))
 177                     (prin1 summary (current-buffer))
 178                     (insert
 179                      "\n        ")
 180                     (setq keystart (point))
 181                     (insert
 182                      (if keywords (format "(%s)" keywords) "nil")
 183                      ")\n")
 184                     (subst-char-in-region keystart (point) ?, ? )
 185                     )))
 186             (directory-files (or d ".")))))
 187        (or dirs load-path))
 188       (insert "))\n
 189 \(provide '" (file-name-sans-extension
 190               (file-name-nondirectory generated-finder-keywords-file)) ")
 191
 192 ;; Local Variables:
 193 ;; version-control: never
 194 ;; no-byte-compile: t
 195 ;; no-update-autoloads: t
 196 ;; End:
 197 \;;; " (file-name-nondirectory generated-finder-keywords-file) " ends here\n")
 198       (kill-buffer "*finder-scratch*")
 199       (eval-buffer) ;; So we get the new keyword list immediately
 200       (basic-save-buffer))))
 201
 202 (defun finder-compile-keywords-make-dist ()
 203   "Regenerate `finder-inf.el' for the Emacs distribution."
 204   (apply 'finder-compile-keywords command-line-args-left)
 205   (kill-emacs))
 206
 207 ;;; Now the retrieval code
 208
 209 (defun finder-insert-at-column (column &rest strings)
 210   "Insert, at column COLUMN, other args STRINGS."
 211   (if (>= (current-column) column) (insert "\n"))
 212   (move-to-column column t)
 213   (apply 'insert strings))
 214
 215 (defvar finder-help-echo nil)
 216
 217 (defun finder-mouse-face-on-line ()
 218   "Put `mouse-face' and `help-echo' properties on the previous line."
 219   (save-excursion
 220     (forward-line -1)
 221     (unless finder-help-echo
 222       (setq finder-help-echo
 223             (let* ((keys1 (where-is-internal 'finder-select
 224                                              finder-mode-map))
 225                    (keys (nconc (where-is-internal
 226                                  'finder-mouse-select finder-mode-map)
 227                                 keys1)))
 228               (concat (mapconcat 'key-description keys ", ")
 229                       ": select item"))))
 230     (add-text-properties
 231      (line-beginning-position) (line-end-position)
 232      '(mouse-face highlight
 233                   help-echo finder-help-echo))))
 234
 235 ;;;###autoload
 236 (defun finder-list-keywords ()
 237   "Display descriptions of the keywords in the Finder buffer."
 238   (interactive)
 239   (if (get-buffer "*Finder*")
 240       (pop-to-buffer "*Finder*")
 241     (pop-to-buffer (set-buffer (get-buffer-create "*Finder*")))
 242     (finder-mode)
 243     (setq buffer-read-only nil)
 244     (erase-buffer)
 245     (mapc
 246      (lambda (assoc)
 247        (let ((keyword (car assoc)))
 248          (insert (symbol-name keyword))
 249          (finder-insert-at-column 14 (concat (cdr assoc) "\n"))
 250          (finder-mouse-face-on-line)))
 251      finder-known-keywords)
 252     (goto-char (point-min))
 253     (setq finder-headmark (point))
 254     (setq buffer-read-only t)
 255     (set-buffer-modified-p nil)
 256     (balance-windows)
 257     (finder-summary)))
 258
 259 (defun finder-list-matches (key)
 260   (pop-to-buffer (set-buffer (get-buffer-create "*Finder Category*")))
 261   (finder-mode)
 262   (setq buffer-read-only nil)
 263   (erase-buffer)
 264   (let ((id (intern key)))
 265     (insert
 266      "The following packages match the keyword `" key "':\n\n")
 267     (setq finder-headmark (point))
 268     (mapc
 269      (lambda (x)
 270        (if (memq id (car (cdr (cdr x))))
 271            (progn
 272              (insert (car x))
 273              (finder-insert-at-column 16 (concat (nth 1 x) "\n"))
 274              (finder-mouse-face-on-line))))
 275      finder-package-info)
 276     (goto-char (point-min))
 277     (forward-line)
 278     (setq buffer-read-only t)
 279     (set-buffer-modified-p nil)
 280     (shrink-window-if-larger-than-buffer)
 281     (finder-summary)))
 282
 283 ;;;###autoload
 284 (defun finder-commentary (file)
 285   "Display FILE's commentary section.
 286 FILE should be in a form suitable for passing to `locate-library'."
 287   (interactive
 288    (list
 289     (completing-read "Library name: "
 290                      (apply-partially 'locate-file-completion-table
 291                                       (or find-function-source-path load-path)
 292                                       (find-library-suffixes)))))
 293   (let* ((str (lm-commentary (find-library-name file))))
 294     (if (null str)
 295         (error "Can't find any Commentary section"))
 296     ;; This used to use *Finder* but that would clobber the
 297     ;; directory of categories.
 298     (delete-other-windows)
 299     (pop-to-buffer "*Finder-package*")
 300     (setq buffer-read-only nil)
 301     (erase-buffer)
 302     (insert str)
 303     (goto-char (point-min))
 304     (delete-blank-lines)
 305     (goto-char (point-max))
 306     (delete-blank-lines)
 307     (goto-char (point-min))
 308     (while (re-search-forward "^;+ ?" nil t)
 309       (replace-match "" nil nil))
 310     (goto-char (point-min))
 311     (setq buffer-read-only t)
 312     (set-buffer-modified-p nil)
 313     (shrink-window-if-larger-than-buffer)
 314     (finder-mode)
 315     (finder-summary)))
 316
 317 (defun finder-current-item ()
 318   (let ((key (save-excursion
 319                (beginning-of-line)
 320                (current-word))))
 321     (if (or (and finder-headmark (< (point) finder-headmark))
 322             (= (length key) 0))
 323         (error "No keyword or filename on this line")
 324       key)))
 325
 326 (defun finder-select ()
 327   "Select item on current line in a finder buffer."
 328   (interactive)
 329   (let ((key (finder-current-item)))
 330       (if (string-match "\\.el$" key)
 331           (finder-commentary key)
 332         (finder-list-matches key))))
 333
 334 (defun finder-mouse-select (event)
 335   "Select item in a finder buffer with the mouse."
 336   (interactive "e")
 337   (save-excursion
 338     (set-buffer (window-buffer (posn-window (event-start event))))
 339     (goto-char (posn-point (event-start event)))
 340     (finder-select)))
 341
 342 ;;;###autoload
 343 (defun finder-by-keyword ()
 344   "Find packages matching a given keyword."
 345   (interactive)
 346   (finder-list-keywords))
 347
 348 (defun finder-mode ()
 349   "Major mode for browsing package documentation.
 350 \\<finder-mode-map>
 351 \\[finder-select]       more help for the item on the current line
 352 \\[finder-exit] exit Finder mode and kill the Finder buffer."
 353   (interactive)
 354   (kill-all-local-variables)
 355   (use-local-map finder-mode-map)
 356   (set-syntax-table finder-mode-syntax-table)
 357   (setq font-lock-defaults '(finder-font-lock-keywords nil nil
 358                              (("+-*/.<>=!?$%_&~^:@" . "w")) nil))
 359   (setq mode-name "Finder")
 360   (setq major-mode 'finder-mode)
 361   (set (make-local-variable 'finder-headmark) nil)
 362   (run-mode-hooks 'finder-mode-hook))
 363
 364 (defun finder-summary ()
 365   "Summarize basic Finder commands."
 366   (interactive)
 367   (message "%s"
 368    (substitute-command-keys
 369     "\\<finder-mode-map>\\[finder-select] = select, \
 370 \\[finder-mouse-select] = select, \\[finder-list-keywords] = to \
 371 finder directory, \\[finder-exit] = quit, \\[finder-summary] = help")))
 372
 373 (defun finder-exit ()
 374   "Exit Finder mode.
 375 Delete the window and kill the buffer."
 376   (interactive)
 377   (condition-case nil (delete-window) (error nil))
 378   (when (get-buffer "*Finder*") (kill-buffer "*Finder*"))
 379   (when (get-buffer "*Finder-package*") (kill-buffer "*Finder-package*"))
 380   (when (get-buffer "*Finder Category*") (kill-buffer "*Finder Category*")))
 381
 382 \f
 383 (provide 'finder)
 384
 385 ;; arch-tag: ec85ff49-8cb8-41f5-a63f-9131d53ce2c5
 386 ;;; finder.el ends here