1
0
mirror of https://git.savannah.gnu.org/git/emacs.git synced 2024-12-04 08:47:11 +00:00
emacs/lisp/finder.el
2000-04-09 20:24:49 +00:00

339 lines
12 KiB
EmacsLisp

;;; finder.el --- topic & keyword-based code finder
;; Copyright (C) 1992, 1997, 1998, 1999 Free Software Foundation, Inc.
;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
;; Created: 16 Jun 1992
;; Version: 1.0
;; Keywords: help
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; This mode uses the Keywords library header to provide code-finding
;; services by keyword.
;;
;; Things to do:
;; 1. Support multiple keywords per search. This could be extremely hairy;
;; there doesn't seem to be any way to get completing-read to exit on
;; an EOL with no substring pending, which is what we'd want to end the loop.
;; 2. Search by string in synopsis line?
;; 3. Function to check finder-package-info for unknown keywords.
;;; Code:
(require 'lisp-mnt)
(require 'finder-inf)
;; Local variable in finder buffer.
(defvar finder-headmark)
;; These are supposed to correspond to top-level customization groups,
;; says rms.
(defvar finder-known-keywords
'(
(abbrev . "abbreviation handling, typing shortcuts, macros")
(bib . "code related to the `bib' bibliography processor")
(c . "support for the C language and related languages")
(calendar . "calendar and time management support")
(comm . "communications, networking, remote access to files")
(convenience . "convenience features for faster editing")
(data . "support editing files of data")
(docs . "support for Emacs documentation")
(emulations . "emulations of other editors")
(extensions . "Emacs Lisp language extensions")
(faces . "support for multiple fonts")
(frames . "support for Emacs frames and window systems")
(games . "games, jokes and amusements")
(hardware . "support for interfacing with exotic hardware")
(help . "support for on-line help systems")
(hypermedia . "support for links between text or other media types")
(i18n . "internationalization and alternate character-set support")
(internal . "code for Emacs internals, build process, defaults")
(languages . "specialized modes for editing programming languages")
(lisp . "Lisp support, including Emacs Lisp")
(local . "code local to your site")
(maint . "maintenance aids for the Emacs development group")
(mail . "modes for electronic-mail handling")
(matching . "various sorts of searching and matching")
(mouse . "mouse support")
(multimedia . "images and sound support")
(news . "support for netnews reading and posting")
(oop . "support for object-oriented programming")
(outlines . "support for hierarchical outlining")
(processes . "process, subshell, compilation, and job control support")
(terminals . "support for terminal types")
(tex . "code related to the TeX formatter")
(tools . "programming tools")
(unix . "front-ends/assistants for, or emulators of, UNIX features")
(vms . "support code for vms")
(wp . "word processing")
))
(defvar finder-mode-map nil)
(or finder-mode-map
(let ((map (make-sparse-keymap)))
(define-key map " " 'finder-select)
(define-key map "f" 'finder-select)
(define-key map [mouse-2] 'finder-mouse-select)
(define-key map "\C-m" 'finder-select)
(define-key map "?" 'finder-summary)
(define-key map "q" 'finder-exit)
(define-key map "d" 'finder-list-keywords)
(setq finder-mode-map map)))
;;; Code for regenerating the keyword list.
(defvar finder-package-info nil
"Assoc list mapping file names to description & keyword lists.")
(defun finder-compile-keywords (&rest dirs)
"Regenerate the keywords association list into the file `finder-inf.el'.
Optional arguments DIRS are a list of Emacs Lisp directories to compile from;
no arguments compiles from `load-path'."
(save-excursion
(let ((processed nil))
(find-file "finder-inf.el")
(erase-buffer)
(insert ";;; finder-inf.el --- keyword-to-package mapping\n")
(insert ";; Keywords: help\n")
(insert ";;; Commentary:\n")
(insert ";; Don't edit this file. It's generated by finder.el\n\n")
(insert ";;; Code:\n")
(insert "\n(setq finder-package-info '(\n")
(mapcar
(lambda (d)
(when (file-exists-p (directory-file-name d))
(message "Directory %s" d)
(mapcar
(lambda (f)
(if (and (or (string-match "^[^=].*\\.el$" f)
;; Allow compressed files also. Fixme:
;; generalize this, especially for
;; MS-DOG-type filenames.
(and (string-match "^[^=].*\\.el\\.\\(gz\\|Z\\)$" f)
(require 'jka-compr)))
;; Ignore lock files.
(not (string-match "^.#" f))
(not (member f processed)))
(let (summary keystart keywords)
(setq processed (cons f processed))
(save-excursion
(set-buffer (get-buffer-create "*finder-scratch*"))
(buffer-disable-undo (current-buffer))
(erase-buffer)
(insert-file-contents
(concat (file-name-as-directory (or d ".")) f))
(setq summary (lm-synopsis))
(setq keywords (lm-keywords)))
(insert
(format " (\"%s\"\n "
(if (string-match "\\.\\(gz\\|Z\\)$" f)
(file-name-sans-extension f)
f)))
(prin1 summary (current-buffer))
(insert
"\n ")
(setq keystart (point))
(insert
(if keywords (format "(%s)" keywords) "nil")
")\n")
(subst-char-in-region keystart (point) ?, ? )
)))
(directory-files (or d ".")))))
(or dirs load-path))
(insert "))\n\n(provide 'finder-inf)\n\n;;; finder-inf.el ends here\n")
(kill-buffer "*finder-scratch*")
(eval-current-buffer) ;; So we get the new keyword list immediately
(basic-save-buffer))))
(defun finder-compile-keywords-make-dist ()
"Regenerate `finder-inf.el' for the Emacs distribution."
(apply 'finder-compile-keywords command-line-args-left)
(kill-emacs))
;;; Now the retrieval code
(defun finder-insert-at-column (column &rest strings)
"Insert, at column COLUMN, other args STRINGS."
(if (> (current-column) column) (insert "\n"))
(move-to-column column t)
(apply 'insert strings))
(defun finder-mouse-face-on-line ()
"Put a `mouse-face' property on the previous line."
(save-excursion
(previous-line 1)
(put-text-property (save-excursion (beginning-of-line) (point))
(progn (end-of-line) (point))
'mouse-face 'highlight)))
;;;###autoload
(defun finder-list-keywords ()
"Display descriptions of the keywords in the Finder buffer."
(interactive)
(if (get-buffer "*Finder*")
(pop-to-buffer "*Finder*")
(pop-to-buffer (set-buffer (get-buffer-create "*Finder*")))
(finder-mode)
(setq buffer-read-only nil)
(erase-buffer)
(mapcar
(lambda (assoc)
(let ((keyword (car assoc)))
(insert (symbol-name keyword))
(finder-insert-at-column 14 (concat (cdr assoc) "\n"))
(finder-mouse-face-on-line)))
finder-known-keywords)
(goto-char (point-min))
(setq finder-headmark (point))
(setq buffer-read-only t)
(set-buffer-modified-p nil)
(balance-windows)
(finder-summary)))
(defun finder-list-matches (key)
(pop-to-buffer (set-buffer (get-buffer-create "*Finder Category*")))
(finder-mode)
(setq buffer-read-only nil)
(erase-buffer)
(let ((id (intern key)))
(insert
"The following packages match the keyword `" key "':\n\n")
(setq finder-headmark (point))
(mapcar
(lambda (x)
(if (memq id (car (cdr (cdr x))))
(progn
(insert (car x))
(finder-insert-at-column 16 (concat (nth 1 x) "\n"))
(finder-mouse-face-on-line))))
finder-package-info)
(goto-char (point-min))
(forward-line)
(setq buffer-read-only t)
(set-buffer-modified-p nil)
(shrink-window-if-larger-than-buffer)
(finder-summary)))
(defun finder-find-library (library)
"Search for file LIBRARY on `load-path'.
Try compressed versions if jka-compr is in use."
(or (locate-library library t)
(if (rassq 'jka-compr-handler file-name-handler-alist)
(or (locate-library (concat library ".gz") t)
(locate-library (concat library ".Z") t)
;; last resort for MS-DOG et al
(locate-library (concat library "z"))))))
;;;###autoload
(defun finder-commentary (file)
"Display FILE's commentary section.
FILE should be in a form suitable for passing to `locate-library'."
(interactive "sLibrary name: ")
(let* ((str (lm-commentary (or (finder-find-library file)
(finder-find-library (concat file ".el"))
(error "Can't find library %s" file)))))
(if (null str)
(error "Can't find any Commentary section"))
(pop-to-buffer "*Finder*")
(setq buffer-read-only nil)
(erase-buffer)
(insert str)
(goto-char (point-min))
(delete-blank-lines)
(goto-char (point-max))
(delete-blank-lines)
(goto-char (point-min))
(while (re-search-forward "^;+ ?" nil t)
(replace-match "" nil nil))
(goto-char (point-min))
(setq buffer-read-only t)
(set-buffer-modified-p nil)
(shrink-window-if-larger-than-buffer)
(finder-mode)
(finder-summary)))
(defun finder-current-item ()
(if (and finder-headmark (< (point) finder-headmark))
(error "No keyword or filename on this line")
(save-excursion
(beginning-of-line)
(current-word))))
(defun finder-select ()
"Select item on current line in a finder buffer."
(interactive)
(let ((key (finder-current-item)))
(if (string-match "\\.el$" key)
(finder-commentary key)
(finder-list-matches key))))
(defun finder-mouse-select (event)
"Select item in a finder buffer with the mouse."
(interactive "e")
(save-excursion
(set-buffer (window-buffer (posn-window (event-start event))))
(goto-char (posn-point (event-start event)))
(finder-select)))
;;;###autoload
(defun finder-by-keyword ()
"Find packages matching a given keyword."
(interactive)
(finder-list-keywords))
(defun finder-mode ()
"Major mode for browsing package documentation.
\\<finder-mode-map>
\\[finder-select] more help for the item on the current line
\\[finder-exit] exit Finder mode and kill the Finder buffer."
(interactive)
(use-local-map finder-mode-map)
(set-syntax-table emacs-lisp-mode-syntax-table)
(setq mode-name "Finder")
(setq major-mode 'finder-mode)
(make-local-variable 'finder-headmark)
(setq finder-headmark nil))
(defun finder-summary ()
"Summarize basic Finder commands."
(interactive)
(message "%s"
(substitute-command-keys
"\\<finder-mode-map>\\[finder-select] = select, \
\\[finder-mouse-select] = select, \\[finder-list-keywords] = to \
finder directory, \\[finder-exit] = quit, \\[finder-summary] = help")))
(defun finder-exit ()
"Exit Finder mode and kill the buffer."
(interactive)
(or (one-window-p t)
(delete-window))
;; Can happen in either buffer -- kill each of the two that exists
(and (get-buffer "*Finder*")
(kill-buffer "*Finder*"))
(and (get-buffer "*Finder Category*")
(kill-buffer "*Finder Category*")))
(provide 'finder)
;;; finder.el ends here