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diff --git a/doc/todo/provide_sha1_for_git_diffurl.mdwn b/doc/todo/provide_sha1_for_git_diffurl.mdwn
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@@ -0,0 +1,26 @@
+This [[patch]] allows for `\[[sha1]]` substitution in the `diffurl`
+for git repositories. This is useful for use with [cgit][] which has
+diffurls of the following form:
+
+ /project.git/diff/\[[file]]?id=\[[sha1_commit]]
+
+ [cgit]: http://hjemli.net/git/cgit/
+
+ diff --git a/IkiWiki/Plugin/git.pm b/IkiWiki/Plugin/git.pm
+ index 5bef928..164210d 100644
+ --- a/IkiWiki/Plugin/git.pm
+ +++ b/IkiWiki/Plugin/git.pm
+ @@ -518,6 +518,7 @@ sub rcs_recentchanges ($) {
+
+ my $diffurl = defined $config{'diffurl'} ? $config{'diffurl'} : "";
+ $diffurl =~ s/\[\[file\]\]/$file/go;
+ + $diffurl =~ s/\[\[sha1\]\]/$sha1/go;
+ $diffurl =~ s/\[\[sha1_parent\]\]/$ci->{'parent'}/go;
+ $diffurl =~ s/\[\[sha1_from\]\]/$detail->{'sha1_from'}/go;
+ $diffurl =~ s/\[\[sha1_to\]\]/$detail->{'sha1_to'}/go;
+
+> [[done]], but I called it `sha1_commit` since I think that's what it's
+> actually a sha1 of. --[[Joey]]
+
+>> I was at a loss for something more descriptive...I like that much
+>> better :) Thanks! --[[JasonBlevins]]