GNU bug report logs - #34532
Unhandled errors in vc

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: bug-gnu-emacs <at> gnu.org
Subject: Unhandled errors in vc
Date: Mon, 18 Feb 2019 23:37:44 +0200

[Message part 1 (text/plain, inline)]

After ‘C-x v g’ (vc-annotate) typing ‘a’ (vc-annotate-revision-previous-to-line)
in the *Annotate* buffer on the earliest (initial) revision fails with:

  Debugger entered--Lisp error: (error "Invalid argument to vc-annotate-warp-revision")
    signal(error ("Invalid argument to vc-annotate-warp-revision"))
    error("Invalid argument to vc-annotate-warp-revision")
    vc-annotate-warp-revision(nil "...")

This patch provides a nicer message:

[vc-annotate.el.patch (text/x-diff, inline)]

diff --git a/lisp/vc/vc-annotate.el b/lisp/vc/vc-annotate.el
index 86fc8686c3..84838135fc 100644
--- a/lisp/vc/vc-annotate.el
+++ b/lisp/vc/vc-annotate.el
@@ -541,7 +541,9 @@ vc-annotate-revision-previous-to-line
 	(setq prev-rev
 	      (vc-call-backend vc-annotate-backend 'previous-revision
                                fname rev))
-	(vc-annotate-warp-revision prev-rev fname)))))
+	(if (not prev-rev)
+            (message "No previous revisions")
+          (vc-annotate-warp-revision prev-rev fname))))))
 
 (defvar log-view-vc-backend)
 (defvar log-view-vc-fileset)

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