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;;; finder.el --- topic & keyword-based code finder
;; Copyright (C) 1992 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, 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)
(require 'picture)
;; Local variable in finder buffer.
(defvar finder-headmark)
(defvar finder-known-keywords
'(
(abbrev . "abbreviation handling, typing shortcuts, macros")
(bib . "code related to the bib(1) bibliography processor")
(c . "C and C++ language support")
(calendar . "calendar and time management support")
(comm . "communications, networking, remote access to files")
(docs . "support for Emacs documentation")
(emulations . "emulations of other editors")
(extensions . "Emacs Lisp language extensions")
(games . "games, jokes and amusements")
(hardware . "support for interfacing with exotic hardware")
(help . "support for on-line help systems")
(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")
(news . "support for netnews reading and posting")
(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)
;(if finder-mode-map
; nil
(setq finder-mode-map (make-sparse-keymap))
(define-key finder-mode-map " " 'finder-select)
(define-key finder-mode-map "?" 'finder-summary)
(define-key finder-mode-map "q" 'finder-exit)
(define-key finder-mode-map "f" 'finder-list-keywords)
; )
;;; 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 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
(function
(lambda (d)
(mapcar
(function
(lambda (f)
(if (and (string-match "^[^=].*\\.el$" 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 " 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)
)))
;;; Now the retrieval code
(defun finder-list-keywords ()
"Display descriptions of the keywords in the Finder buffer."
(interactive)
(setq buffer-read-only nil)
(erase-buffer)
(mapcar
(function (lambda (assoc)
(let ((keyword (car assoc)))
(insert (symbol-name keyword))
(insert-at-column 14 (concat (cdr assoc) "\n"))
(cons (symbol-name keyword) keyword))))
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)
(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
(function (lambda (x)
(if (memq id (car (cdr (cdr x))))
(progn
(insert (car x))
(insert-at-column 16
(concat (car (cdr x)) "\n"))
))
))
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)))
;; Search for a file named FILE the same way `load' would search.
(defun finder-find-library (file)
(if (file-name-absolute-p file)
file
(let ((dirs load-path)
found)
(while (and dirs (not found))
(if (file-exists-p (expand-file-name (concat file ".el") (car dirs)))
(setq found (expand-file-name file (car dirs)))
(if (file-exists-p (expand-file-name file (car dirs)))
(setq found (expand-file-name file (car dirs)))))
(setq dirs (cdr dirs)))
found)))
(defun finder-commentary (file)
(interactive)
(let* ((str (lm-commentary (finder-find-library 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-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 ()
(interactive)
(let ((key (finder-current-item)))
(if (string-match "\\.el$" key)
(finder-commentary key)
(finder-list-matches key))))
(defun finder-by-keyword ()
"Find packages matching a given keyword."
(interactive)
(finder-mode)
(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 fill the Finder buffer.
"
(interactive)
(pop-to-buffer "*Finder*")
(setq buffer-read-only nil)
(erase-buffer)
(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
(substitute-command-keys
"\\<finder-mode-map>\\[finder-select] = select, \\[finder-list-keywords] = back to finder, \\[finder-exit] = quit, \\[finder-summary] = help")))
(defun finder-exit ()
"Exit Finder mode and kill the buffer"
(interactive)
(delete-window)
(kill-buffer "*Finder*"))
(provide 'finder)
;;; finder.el ends here
|
