mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-23 10:34:07 +00:00
139 lines
4.4 KiB
EmacsLisp
139 lines
4.4 KiB
EmacsLisp
;;; octave-hlp.el --- getting help on Octave symbols using info
|
|
|
|
;; Copyright (C) 1997 Free Software Foundation, Inc.
|
|
|
|
;; Author: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>
|
|
;; Author: John Eaton <jwe@bevo.che.wisc.edu>
|
|
;; Maintainer: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>
|
|
;; Keywords: languages
|
|
|
|
;; 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:
|
|
|
|
;; Provides the command `octave-help' which allows index lookup of a
|
|
;; symbol in the Octave-related info files, as specified by the list
|
|
;; `octave-help-files'.
|
|
|
|
;; Other features may be added in future versions.
|
|
|
|
;;; Code:
|
|
|
|
(require 'octave-mod)
|
|
(require 'info)
|
|
|
|
(defvar octave-help-files '("octave")
|
|
"List of info files with documentation for Octave.
|
|
Default is (\"octave\").")
|
|
|
|
(defvar octave-help-lookup-alist nil
|
|
"Alist of Octave index entries for lookup.")
|
|
|
|
(defvar octave-help-completion-alist nil
|
|
"Alist of Octave index entries for completion.
|
|
The entries are of the form (VAR . VAR), where VAR runs through all
|
|
different keys in `octave-help-lookup-alist'.")
|
|
|
|
;;;###autoload
|
|
(defun octave-help (key)
|
|
"Get help on Octave symbols from the Octave info files.
|
|
Look up KEY in the function, operator and variable indices of the files
|
|
specified by `octave-help-files'.
|
|
If KEY is not a string, prompt for it with completion."
|
|
(interactive
|
|
(list
|
|
(completing-read (format "Describe Octave symbol: ")
|
|
(octave-help-get-completion-alist)
|
|
nil t)))
|
|
(if (get-buffer "*info*")
|
|
(set-buffer "*info*"))
|
|
(if (zerop (length key))
|
|
(Info-find-node (car octave-help-files) "Top")
|
|
(let ((alist (copy-alist (octave-help-get-lookup-alist)))
|
|
entry matches)
|
|
(while (setq entry (car alist))
|
|
(if (string-match key (car entry))
|
|
(add-to-list 'matches entry))
|
|
(setq alist (cdr alist)))
|
|
(if matches
|
|
(progn
|
|
(setq Info-index-alternatives matches)
|
|
(Info-index-next 0))))))
|
|
|
|
(defun octave-help-get-lookup-alist ()
|
|
"Build the index lookup alist from all Octave info files.
|
|
The files specified by `octave-help-files' are searched."
|
|
(if octave-help-lookup-alist
|
|
()
|
|
(message "Building help lookup alist...")
|
|
(let ((files octave-help-files) file key node)
|
|
(save-window-excursion
|
|
(while files
|
|
(setq file (car files))
|
|
(Info-goto-node (concat "(" file ")"))
|
|
(condition-case nil
|
|
(progn
|
|
(Info-index "")
|
|
(while
|
|
(progn
|
|
(while (re-search-forward
|
|
"^\\* \\([^(:]+\\)[^:]*: *\\(.+\\)\\.$"
|
|
nil t)
|
|
(setq key (match-string 1)
|
|
node (concat "(" file ")" (match-string 2)))
|
|
(and (string-match "\\(.*\\>\\) *$" key)
|
|
(setq key (replace-match "\\1" t nil key)))
|
|
(add-to-list 'octave-help-lookup-alist
|
|
(list key
|
|
node
|
|
(concat (concat "(" file ")")
|
|
Info-current-node)
|
|
0)))
|
|
(and (setq node (Info-extract-pointer "next" t))
|
|
(string-match
|
|
(concat "\\(Function\\|Operator\\|Variable\\) "
|
|
"\\<Index\\>")
|
|
node)))
|
|
(Info-goto-node node)))
|
|
(error nil))
|
|
(setq files (cdr files)))))
|
|
(message "Building help lookup alist...done"))
|
|
octave-help-lookup-alist)
|
|
|
|
(defun octave-help-get-completion-alist ()
|
|
"Build the index completion alist from all Octave info files.
|
|
The files specified by `octave-help-files' are searched."
|
|
(if octave-help-completion-alist
|
|
()
|
|
(message "Building help completion alist...")
|
|
(let ((alist (octave-help-get-lookup-alist)) entry)
|
|
(while alist
|
|
(setq entry (car alist))
|
|
(add-to-list 'octave-help-completion-alist
|
|
(cons (car entry) (car entry)))
|
|
(setq alist (cdr alist))))
|
|
(message "Building help completion alist...done"))
|
|
octave-help-completion-alist)
|
|
|
|
;;; provide ourself
|
|
|
|
(provide 'octave-hlp)
|
|
|
|
;;; arch-tag: df5ef8fa-76c9-44e5-9835-cb5a502c6282
|
|
;;; octave-hlp.el ends here
|