lisp/finder.el

   1 ;;; finder.el --- topic & keyword-based code finder
   2
   3 ;; Copyright (C) 1992, 1997-1999, 2001-2014 Free Software Foundation,
   4 ;; 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 of the License, or
  16 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  25
  26 ;;; Commentary:
  27
  28 ;; This mode uses the Keywords library header to provide code-finding
  29 ;; services by keyword.
  30
  31 ;;; Code:
  32
  33 (require 'package)
  34 (require 'lisp-mnt)
  35 (require 'find-func) ;for find-library(-suffixes)
  36 (require 'finder-inf nil t)
  37
  38 ;; These are supposed to correspond to top-level customization groups,
  39 ;; says rms.
  40 (defvar finder-known-keywords
  41   '((abbrev     . "abbreviation handling, typing shortcuts, and macros")
  42     (bib        . "bibliography processors")
  43     (c          . "C and related programming languages")
  44     (calendar   . "calendar and time management tools")
  45     (comm       . "communications, networking, and remote file access")
  46     (convenience . "convenience features for faster editing")
  47     (data       . "editing data (non-text) files")
  48     (docs       . "Emacs documentation facilities")
  49     (emulations . "emulations of other editors")
  50     (extensions . "Emacs Lisp language extensions")
  51     (faces      . "fonts and colors for text")
  52     (files      . "file editing and manipulation")
  53     (frames     . "Emacs frames and window systems")
  54     (games      . "games, jokes and amusements")
  55     (hardware   . "interfacing with system hardware")
  56     (help       . "on-line help systems")
  57     (hypermedia . "links between text or other media types")
  58     (i18n       . "internationalization and character-set support")
  59     (internal   . "code for Emacs internals, build process, defaults")
  60     (languages  . "specialized modes for editing programming languages")
  61     (lisp       . "Lisp support, including Emacs Lisp")
  62     (local      . "code local to your site")
  63     (maint      . "Emacs development tools and aids")
  64     (mail       . "email reading and posting")
  65     (matching   . "searching, matching, and sorting")
  66     (mouse      . "mouse support")
  67     (multimedia . "images and sound")
  68     (news       . "USENET news reading and posting")
  69     (outlines   . "hierarchical outlining and note taking")
  70     (processes  . "processes, subshells, and compilation")
  71     (terminals  . "text terminals (ttys)")
  72     (tex        . "the TeX document formatter")
  73     (tools      . "programming tools")
  74     (unix       . "UNIX feature interfaces and emulators")
  75     (vc         . "version control")
  76     (wp         . "word processing")))
  77
  78 (defvar finder-mode-map
  79   (let ((map (make-sparse-keymap))
  80         (menu-map (make-sparse-keymap "Finder")))
  81     (define-key map " " 'finder-select)
  82     (define-key map "f" 'finder-select)
  83     (define-key map [follow-link] 'mouse-face)
  84     (define-key map [mouse-2]   'finder-mouse-select)
  85     (define-key map "\C-m"      'finder-select)
  86     (define-key map "?" 'finder-summary)
  87     (define-key map "n" 'next-line)
  88     (define-key map "p" 'previous-line)
  89     (define-key map "q" 'finder-exit)
  90     (define-key map "d" 'finder-list-keywords)
  91
  92     (define-key map [menu-bar finder-mode]
  93       (cons "Finder" menu-map))
  94     (define-key menu-map [finder-exit]
  95       '(menu-item "Quit" finder-exit
  96                   :help "Exit Finder mode"))
  97     (define-key menu-map [finder-summary]
  98       '(menu-item "Summary" finder-summary
  99                   :help "Summary item on current line in a finder buffer"))
 100     (define-key menu-map [finder-list-keywords]
 101       '(menu-item "List keywords" finder-list-keywords
 102                   :help "Display descriptions of the keywords in the Finder buffer"))
 103     (define-key menu-map [finder-select]
 104       '(menu-item "Select" finder-select
 105                   :help "Select item on current line in a finder buffer"))
 106     map))
 107
 108 (defvar finder-mode-syntax-table
 109   (let ((st (make-syntax-table emacs-lisp-mode-syntax-table)))
 110     (modify-syntax-entry ?\; ".   " st)
 111     st)
 112   "Syntax table used while in `finder-mode'.")
 113
 114 (defvar finder-font-lock-keywords
 115   '(("`\\([^'`]+\\)'" 1 font-lock-constant-face prepend))
 116   "Font-lock keywords for Finder mode.")
 117
 118 (defvar finder-headmark nil
 119   "Internal finder-mode variable, local in finder buffer.")
 120
 121 ;;; Code for regenerating the keyword list.
 122
 123 (defvar finder-keywords-hash nil
 124   "Hash table mapping keywords to lists of package names.
 125 Keywords and package names both should be symbols.")
 126
 127 (defvar generated-finder-keywords-file "finder-inf.el"
 128   "The function `finder-compile-keywords' writes keywords into this file.")
 129
 130 ;; Skip autogenerated files, because they will never contain anything
 131 ;; useful, and because in parallel builds of Emacs they may get
 132 ;; modified while we are trying to read them.
 133 ;; http://lists.gnu.org/archive/html/emacs-pretest-bug/2007-01/msg00469.html
 134 ;; ldefs-boot is not auto-generated, but has nothing useful.
 135 (defvar finder-no-scan-regexp "\\(^\\.#\\|\\(loaddefs\\|ldefs-boot\\|\
 136 cus-load\\|finder-inf\\|esh-groups\\|subdirs\\)\\.el$\\)"
 137   "Regexp matching file names not to scan for keywords.")
 138
 139 (autoload 'autoload-rubric "autoload")
 140
 141 (defvar finder--builtins-alist
 142   '(("calc" . calc)
 143     ("ede"  . ede)
 144     ("erc"  . erc)
 145     ("eshell" . eshell)
 146     ("gnus" . gnus)
 147     ("international" . emacs)
 148     ("language" . emacs)
 149     ("mh-e" . mh-e)
 150     ("semantic" . semantic)
 151     ("analyze" . semantic)
 152     ("bovine" . semantic)
 153     ("decorate" . semantic)
 154     ("symref" . semantic)
 155     ("wisent" . semantic)
 156     ("nxml" . nxml)
 157     ("org"  . org)
 158     ("srecode" . srecode)
 159     ("term" . emacs)
 160     ("url"  . url))
 161   "Alist of built-in package directories.
 162 Each element should have the form (DIR . PACKAGE), where DIR is a
 163 directory name and PACKAGE is the name of a package (a symbol).
 164 When generating `package--builtins', Emacs assumes any file in
 165 DIR is part of the package PACKAGE.")
 166
 167 (defun finder-compile-keywords (&rest dirs)
 168   "Regenerate list of built-in Emacs packages.
 169 This recomputes `package--builtins' and `finder-keywords-hash',
 170 and prints them into the file `generated-finder-keywords-file'.
 171
 172 Optional DIRS is a list of Emacs Lisp directories to compile
 173 from; the default is `load-path'."
 174   ;; Allow compressed files also.
 175   (setq package--builtins nil)
 176   (setq finder-keywords-hash (make-hash-table :test 'eq))
 177   (let ((el-file-regexp "^\\([^=].*\\)\\.el\\(\\.\\(gz\\|Z\\)\\)?$")
 178         package-override files base-name processed
 179         summary keywords package version entry desc)
 180     (dolist (d (or dirs load-path))
 181       (when (file-exists-p (directory-file-name d))
 182         (message "Directory %s" d)
 183         (setq package-override
 184               (intern-soft
 185                (cdr-safe
 186                 (assoc (file-name-nondirectory (directory-file-name d))
 187                        finder--builtins-alist))))
 188         (setq files (directory-files d nil el-file-regexp))
 189         (dolist (f files)
 190           (unless (or (string-match finder-no-scan-regexp f)
 191                       (null (setq base-name
 192                                   (and (string-match el-file-regexp f)
 193                                        (intern (match-string 1 f)))))
 194                       (memq base-name processed))
 195             (push base-name processed)
 196             (with-temp-buffer
 197               (insert-file-contents (expand-file-name f d))
 198               (setq summary  (lm-synopsis)
 199                     keywords (mapcar 'intern (lm-keywords-list))
 200                     package  (or package-override
 201                                  (let ((str (lm-header "package")))
 202                                    (if str (intern str)))
 203                                  base-name)
 204                     version  (lm-header "version")))
 205             (when summary
 206               (setq version (ignore-errors (version-to-list version)))
 207               (setq entry (assq package package--builtins))
 208               (cond ((null entry)
 209                      (push (cons package
 210                                  (package-make-builtin version summary))
 211                            package--builtins))
 212                     ((eq base-name package)
 213                      (setq desc (cdr entry))
 214                      (aset desc 0 version)
 215                      (aset desc 2 summary)))
 216               (dolist (kw keywords)
 217                 (puthash kw
 218                          (cons package
 219                                (delq package
 220                                      (gethash kw finder-keywords-hash)))
 221                          finder-keywords-hash))))))))
 222
 223   (setq package--builtins
 224         (sort package--builtins
 225               (lambda (a b) (string< (symbol-name (car a))
 226                                      (symbol-name (car b))))))
 227
 228   (with-current-buffer
 229       (find-file-noselect generated-finder-keywords-file)
 230     (setq buffer-undo-list t)
 231     (erase-buffer)
 232     (insert (autoload-rubric generated-finder-keywords-file
 233                              "keyword-to-package mapping" t))
 234     (search-backward "\f")
 235     ;; FIXME: Now that we have package--builtin-versions, package--builtins is
 236     ;; only needed to get the list of unversioned packages and to get the
 237     ;; summary description of each package.
 238     (insert "(setq package--builtins '(\n")
 239     (dolist (package package--builtins)
 240       (insert "  ")
 241       (prin1 package (current-buffer))
 242       (insert "\n"))
 243     (insert "))\n\n")
 244     ;; Insert hash table.
 245     (insert "(setq finder-keywords-hash\n      ")
 246     (prin1 finder-keywords-hash (current-buffer))
 247     (insert ")\n")
 248     (basic-save-buffer)))
 249
 250 (defun finder-compile-keywords-make-dist ()
 251   "Regenerate `finder-inf.el' for the Emacs distribution."
 252   (apply 'finder-compile-keywords command-line-args-left)
 253   (kill-emacs))
 254
 255 ;;; Now the retrieval code
 256
 257 (defun finder-insert-at-column (column &rest strings)
 258   "Insert, at column COLUMN, other args STRINGS."
 259   (if (>= (current-column) column) (insert "\n"))
 260   (move-to-column column t)
 261   (apply 'insert strings))
 262
 263 (defvar finder-help-echo nil)
 264
 265 (defun finder-mouse-face-on-line ()
 266   "Put `mouse-face' and `help-echo' properties on the previous line."
 267   (save-excursion
 268     (forward-line -1)
 269     ;; If finder-insert-at-column moved us to a new line, go back one more.
 270     (if (looking-at "[ \t]") (forward-line -1))
 271     (unless finder-help-echo
 272       (setq finder-help-echo
 273             (let* ((keys1 (where-is-internal 'finder-select
 274                                              finder-mode-map))
 275                    (keys (nconc (where-is-internal
 276                                  'finder-mouse-select finder-mode-map)
 277                                 keys1)))
 278               (concat (mapconcat 'key-description keys ", ")
 279                       ": select item"))))
 280     (add-text-properties
 281      (line-beginning-position) (line-end-position)
 282      '(mouse-face highlight
 283                   help-echo finder-help-echo))))
 284
 285 (defun finder-unknown-keywords ()
 286   "Return an alist of unknown keywords and number of their occurrences.
 287 Unknown keywords are those present in `finder-keywords-hash' but
 288 not `finder-known-keywords'."
 289   (let (alist)
 290     (maphash (lambda (kw packages)
 291                (unless (assq kw finder-known-keywords)
 292                  (push (cons kw (length packages)) alist)))
 293              finder-keywords-hash)
 294     (sort alist (lambda (a b) (string< (car a) (car b))))))
 295
 296 ;;;###autoload
 297 (defun finder-list-keywords ()
 298   "Display descriptions of the keywords in the Finder buffer."
 299   (interactive)
 300   (if (get-buffer "*Finder*")
 301       (pop-to-buffer "*Finder*")
 302     (pop-to-buffer (get-buffer-create "*Finder*"))
 303     (finder-mode)
 304     (let ((inhibit-read-only t))
 305       (erase-buffer)
 306       (dolist (assoc finder-known-keywords)
 307         (let ((keyword (car assoc)))
 308           (insert (propertize (symbol-name keyword)
 309                               'font-lock-face 'font-lock-constant-face))
 310           (finder-insert-at-column 14 (concat (cdr assoc) "\n"))
 311           (finder-mouse-face-on-line)))
 312       (goto-char (point-min))
 313       (setq finder-headmark (point)
 314             buffer-read-only t)
 315       (set-buffer-modified-p nil)
 316       (balance-windows)
 317       (finder-summary))))
 318
 319 (defun finder-list-matches (key)
 320   (let* ((id (intern key))
 321          (packages (gethash id finder-keywords-hash)))
 322     (unless packages
 323       (error "No packages matching key `%s'" key))
 324     (package-show-package-list packages)))
 325
 326 (define-button-type 'finder-xref 'action #'finder-goto-xref)
 327
 328 (defun finder-goto-xref (button)
 329   "Jump to a lisp file for the BUTTON at point."
 330   (let* ((file (button-get button 'xref))
 331          (lib (locate-library file)))
 332     (if lib (finder-commentary lib)
 333       (message "Unable to locate `%s'" file))))
 334
 335 ;;;###autoload
 336 (defun finder-commentary (file)
 337   "Display FILE's commentary section.
 338 FILE should be in a form suitable for passing to `locate-library'."
 339   (interactive
 340    (list
 341     (completing-read "Library name: "
 342                      (apply-partially 'locate-file-completion-table
 343                                       (or find-function-source-path load-path)
 344                                       (find-library-suffixes)))))
 345   (let ((str (lm-commentary (find-library-name file))))
 346     (or str (error "Can't find any Commentary section"))
 347     ;; This used to use *Finder* but that would clobber the
 348     ;; directory of categories.
 349     (pop-to-buffer "*Finder-package*")
 350     (setq buffer-read-only nil
 351           buffer-undo-list t)
 352     (erase-buffer)
 353     (insert str)
 354     (goto-char (point-min))
 355     (delete-blank-lines)
 356     (goto-char (point-max))
 357     (delete-blank-lines)
 358     (goto-char (point-min))
 359     (while (re-search-forward "^;+ ?" nil t)
 360       (replace-match "" nil nil))
 361     (goto-char (point-min))
 362     (while (re-search-forward "\\<\\([-[:alnum:]]+\\.el\\)\\>" nil t)
 363       (if (locate-library (match-string 1))
 364           (make-text-button (match-beginning 1) (match-end 1)
 365                             'xref (match-string-no-properties 1)
 366                             'help-echo "Read this file's commentary"
 367                             :type 'finder-xref)))
 368     (goto-char (point-min))
 369     (setq buffer-read-only t)
 370     (set-buffer-modified-p nil)
 371     (shrink-window-if-larger-than-buffer)
 372     (finder-mode)
 373     (finder-summary)))
 374
 375 (defun finder-current-item ()
 376   (let ((key (save-excursion
 377                (beginning-of-line)
 378                (current-word))))
 379     (if (or (and finder-headmark (< (point) finder-headmark))
 380             (zerop (length key)))
 381         (error "No keyword or filename on this line")
 382       key)))
 383
 384 (defun finder-select ()
 385   "Select item on current line in a finder buffer."
 386   (interactive)
 387   (let ((key (finder-current-item)))
 388       (if (string-match "\\.el$" key)
 389           (finder-commentary key)
 390         (finder-list-matches key))))
 391
 392 (defun finder-mouse-select (event)
 393   "Select item in a finder buffer with the mouse."
 394   (interactive "e")
 395   (with-current-buffer (window-buffer (posn-window (event-start event)))
 396     (goto-char (posn-point (event-start event)))
 397     (finder-select)))
 398
 399 ;;;###autoload
 400 (defun finder-by-keyword ()
 401   "Find packages matching a given keyword."
 402   (interactive)
 403   (finder-list-keywords))
 404
 405 (define-derived-mode finder-mode nil "Finder"
 406   "Major mode for browsing package documentation.
 407 \\<finder-mode-map>
 408 \\[finder-select]       more help for the item on the current line
 409 \\[finder-exit] exit Finder mode and kill the Finder buffer."
 410   :syntax-table finder-mode-syntax-table
 411   (setq buffer-read-only t
 412         buffer-undo-list t)
 413   (set (make-local-variable 'finder-headmark) nil))
 414
 415 (defun finder-summary ()
 416   "Summarize basic Finder commands."
 417   (interactive)
 418   (message "%s"
 419    (substitute-command-keys
 420     "\\<finder-mode-map>\\[finder-select] = select, \
 421 \\[finder-mouse-select] = select, \\[finder-list-keywords] = to \
 422 finder directory, \\[finder-exit] = quit, \\[finder-summary] = help")))
 423
 424 (defun finder-exit ()
 425   "Exit Finder mode.
 426 Delete the window and kill all Finder-related buffers."
 427   (interactive)
 428   (ignore-errors (delete-window))
 429   (let ((buf "*Finder*"))
 430     (and (get-buffer buf) (kill-buffer buf))))
 431
 432 \f
 433 (provide 'finder)
 434
 435 ;;; finder.el ends here