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- ;;; refer.el --- look up references in bibliography files.
-
- ;; Copyright (C) 1992 Free Software Foundation, Inc.
-
- ;; Author: Ashwin Ram <Ram-Ashwin@cs.yale.edu>
- ;; Adapted-By: ESR
- ;; Keywords: bib
-
- ;; 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:
-
- ;; Functions to look up references in bibliography files given lists of
- ;; keywords, similar to refer(1). I don't use tags since tags on .bib files
- ;; only picks up the cite key, where as refer-find-entry looks for occurrences
- ;; of keywords anywhere in the bibliography entry.
- ;;
- ;; To use:
- ;; (autoload 'refer-find-entry "refer" nil t)
- ;; or (require 'refer)
- ;;
- ;; To look for an article by Knuth about semaphores:
- ;; Invoke refer-find-entry, then in response to the Keywords: prompt,
- ;; say: Knuth semaphores (a blank-separated list of keywords to be used
- ;; as search strings).
- ;;
- ;; To continue the previous search, i.e., to search for the next occurrence
- ;; of the keywords, use refer-find-next-entry, or invoke refer-find-entry
- ;; with a prefix argument.
- ;;
- ;; If the list of bibliography files changes, reinitialize the variable
- ;; refer-bib-files.
- ;;
- ;; To customize:
- ;; See variables refer-bib-files, refer-cache-bib-files and
- ;; refer-bib-files-regexp. By default, these are set up so that refer
- ;; looks for the keywords you specify in all the .bib files in the current
- ;; directory.
- ;;
- ;; The only assumption I make about bib files is that they contain a bunch
- ;; of entries, one to a paragraph. refer-find-entry searches paragraph by
- ;; paragraph, looking for a paragraph containing all the keywords
- ;; specified. So you should be able to use pretty much any bib file with
- ;; this code. If your bib file does not use paragraphs to separate
- ;; entries, try setting the paragraph-start/separate variables, or changing
- ;; the (forward-paragraph 1) call in refer-find-entry-in-file.
-
- ;;; ChangeLog:
-
- ;; 01/08/89 Ashwin Ram <Ram-Ashwin@cs.yale.edu>
- ;; Initial release.
- ;;
-
- ;;; Code:
-
- (provide 'refer)
-
- (defvar refer-bib-files 'dir
- "*List of \\.bib files to search for references,
- or one of the following special values:
- nil = prompt for \\.bib file (if visiting a \\.bib file, use it as default)
- auto = read \\.bib file names from appropriate command in buffer (see refer-bib-files-regexp)
- dir = use all \\.bib files in current directory.
-
- If a specified file doesn't exist and has no extension, a \\.bib extension
- is automatically tried.
-
- If refer-bib-files is nil, auto or dir, it is setq'd to the appropriate
- list of files when it is first used if refer-cache-bib-files is t. If
- refer-cache-bib-files is nil, the list of \\.bib files to use is re-read
- each time it is needed.")
-
- (defvar refer-cache-bib-files t
- "*Variable determining whether the value of refer-bib-files should be cached.
- If t, initialize the value of refer-bib-files the first time it is used. If
- nil, re-read the list of \\.bib files depending on the value of refer-bib-files
- each time it is needed.")
-
- (defvar refer-bib-files-regexp "\\\\bibliography"
- "*Regexp matching a bibliography file declaration.
- The current buffer is expected to contain a line such as
- \\bibliography{file1,file2,file3}
- which is read to set up refer-bib-files. The regexp must specify the command
- \(such as \\bibliography) that is used to specify the list of bib files. The
- command is expected to specify a file name, or a list of comma-separated file
- names, within curly braces.
- If a specified file doesn't exist and has no extension, a \\.bib extension
- is automatically tried.")
-
- (make-variable-buffer-local 'refer-bib-files)
- (make-variable-buffer-local 'refer-cache-bib-files)
-
- (defun refer-find-entry (keywords &optional continue)
- "Find entry in refer-bib-files containing KEYWORDS.
- If KEYWORDS is nil, prompt user for blank-separated list of keywords.
- If CONTINUE is t, or if called interactively with a prefix arg, look for next
- entry by continuing search from previous point."
- (interactive (list nil current-prefix-arg))
- (or keywords (setq keywords (if continue
- refer-previous-keywords
- (read-string "Keywords: "))))
- (setq refer-previous-keywords keywords)
- (refer-find-entry-internal keywords continue))
-
- (defun refer-find-next-entry ()
- "Find next occurrence of entry in refer-bib-files. See refer-find-entry."
- (interactive)
- (refer-find-entry-internal refer-previous-keywords t))
-
- (defun refer-find-entry-internal (keywords continue)
- (let ((keywords-list (refer-convert-string-to-list-of-strings keywords))
- (files (if continue
- refer-saved-state
- (refer-get-bib-files))))
- (catch 'found
- (while files
- (let ((file (cond ((file-exists-p (car files)) (car files))
- ((file-exists-p (concat (car files) ".bib")) (concat (car files) ".bib")))))
- (setq refer-saved-state files)
- (if file
- (if (refer-find-entry-in-file keywords-list file continue)
- (throw 'found (find-file file))
- (setq files (cdr files)))
- (progn (message "Scanning %s... No such file" (car files) (ding))
- (sit-for 1)
- (setq files (cdr files))))))
- (message "Keywords \"%s\" not found in any \.bib file" keywords (ding)))))
-
- (defun refer-find-entry-in-file (keywords-list file &optional continue)
- (message "Scanning %s..." file) ; (expand-file-name file)
- (set-buffer (find-file-noselect file))
- (if continue
- (forward-paragraph 1)
- (goto-char (point-min)))
- (let ((begin (point))
- (end 0)
- (found nil))
- (while (and (not found)
- (not (eobp)))
- (forward-paragraph 1)
- (setq end (point))
- (setq found
- (refer-every (function (lambda (keyword)
- (goto-char begin)
- (re-search-forward keyword end t)))
- keywords-list))
- (if (not found)
- (progn
- (setq begin end)
- (goto-char begin))))
- (if found
- (progn (goto-char begin)
- (re-search-forward "\\W" nil t)
- (message "Scanning %s... found" file))
- (progn (message "Scanning %s... not found" file)
- nil))))
-
- (defun refer-every (pred l)
- (cond ((null l) nil)
- ((funcall pred (car l))
- (or (null (cdr l))
- (refer-every pred (cdr l))))))
-
- (defun refer-convert-string-to-list-of-strings (s)
- (let ((current (current-buffer))
- (temp-buffer (get-buffer-create "*refer-temp*")))
- (set-buffer temp-buffer)
- (erase-buffer)
- (insert (regexp-quote s))
- (goto-char (point-min))
- (insert "(\"")
- (while (re-search-forward "[ \t]+" nil t)
- (replace-match "\" \"" t t))
- (goto-char (point-max))
- (insert "\")")
- (goto-char (point-min))
- (prog1 (read temp-buffer)
- (set-buffer current))))
-
- (defun refer-get-bib-files ()
- (let ((files
- (cond ((null refer-bib-files)
- (list (expand-file-name
- (if (eq major-mode 'bibtex-mode)
- (read-file-name (format ".bib file: (default %s) " (file-name-nondirectory (buffer-file-name)))
- (file-name-directory (buffer-file-name))
- (file-name-nondirectory (buffer-file-name))
- t)
- (read-file-name ".bib file: " nil nil t)))))
- ((listp refer-bib-files) refer-bib-files)
- ((eq refer-bib-files 'auto)
- (save-excursion
- (if (progn (goto-char (point-min))
- (re-search-forward (concat refer-bib-files-regexp "\{") nil t))
- (let ((files (list (buffer-substring (point)
- (progn (re-search-forward "[,\}]" nil t)
- (backward-char 1)
- (point))))))
- (while (not (looking-at "\}"))
- (setq files (append files
- (list (buffer-substring (progn (forward-char 1)
- (point))
- (progn (re-search-forward "[,\}]" nil t)
- (backward-char 1)
- (point)))))))
- files)
- (error "No \\\\bibliography command in this buffer, can't read refer-bib-files"))))
- ((eq refer-bib-files 'dir)
- (directory-files "." t "\\.bib$"))
- (t (error "Illegal value for refer-bib-files: %s" refer-bib-files)))))
- (if refer-cache-bib-files
- (setq refer-bib-files files))
- files))
-
- ;;; refer.el ends here
-