master 9ac8901: Make bibtex-parse-keys more robust

[Lars Ingebrigtsen]

branch: master
commit 9ac8901b0ae5a6bb75c790832caf4ea9be8df16f
Author: Lars Ingebrigtsen <address@hidden>
Commit: Lars Ingebrigtsen <address@hidden>

    Make bibtex-parse-keys more robust
    
    * lisp/textmodes/bibtex.el (bibtex-parse-keys): Protect against
    bugging out just when starting almost-empty bibtex files
    (bug#30112).
---
 lisp/textmodes/bibtex.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lisp/textmodes/bibtex.el b/lisp/textmodes/bibtex.el
index c29e963..2d24178 100644
--- a/lisp/textmodes/bibtex.el
+++ b/lisp/textmodes/bibtex.el
@@ -2915,6 +2915,9 @@ for parsing BibTeX keys.  If parsing fails, try to set 
this variable to nil."
                                          (1+ (match-beginning 3)) (1- 
(match-end 3)))))
                                (unless (assoc key crossref-keys)
                                  (push (list key) crossref-keys))))
+                            ;; We have probably have a non-bibtex file.
+                            ((not (match-beginning bibtex-type-in-head))
+                             (throw 'userkey nil))
                             ;; only keys of known entries
                             ((assoc-string (bibtex-type-in-head)
                                            bibtex-entry-alist t)