Commit ee6f7c13 authored by Richard M. Stallman's avatar Richard M. Stallman
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;;; refer.el --- look up references in bibliography files.
;; Copyright (C) 1992 Free Software Foundation, Inc.
;; Author: Ashwin Ram <>
;; 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
;; 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:
;; 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 <>
;; 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
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
(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."
(refer-find-entry-internal refer-previous-keywords t))
(defun refer-find-entry-internal (keywords continue)
(let ((keywords-list (convert-string-to-list-of-strings keywords))
(files (if continue
(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
(every (function (lambda (keyword)
(goto-char begin)
(re-search-forward keyword end t)))
(if (not found)
(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)
(defun every (pred l)
(cond ((null l) nil)
((funcall pred (car l))
(or (null (cdr l))
(every pred (cdr l))))))
(defun convert-string-to-list-of-strings (s)
(let ((current (current-buffer))
(temp-buffer (get-buffer-create "*refer-temp*")))
(set-buffer temp-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))
(read-file-name ".bib file: " nil nil t)))))
((listp refer-bib-files) refer-bib-files)
((eq refer-bib-files 'auto)
(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)
(while (not (looking-at "\}"))
(setq files (append files
(list (buffer-substring (progn (forward-char 1)
(progn (re-search-forward "[,\}]" nil t)
(backward-char 1)
(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))
;;; refer.el ends here
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