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The bzr plugin does not seem to define the rcs_diff subroutine.
I got the follow error after enabling recentchangesdiff:
"Undefined subroutine &IkiWiki::Plugin::bzr::rcs_diff called at /usr/share/perl5/IkiWiki.pm line 1590."
Grepping to verify absence of rcs_diff:
$ grep rcs_diff /usr/share/perl5/IkiWiki/Plugin/{git,bzr}.pm
/usr/share/perl5/IkiWiki/Plugin/git.pm: hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
/usr/share/perl5/IkiWiki/Plugin/git.pm:sub rcs_diff ($) {
/usr/share/perl5/IkiWiki/Plugin/bzr.pm: hook(type => "rcs", id => "rcs_diff", call => \&rcs_diff);
I've added the minimal stub needed to avoid the crash, but for
recentchangesdiff to work, someone needs to implement rcs_diff for bzr.
This should be trivial if you know and use bzr. The function
is passed as a parameter the revno of interest and just needs
to ask bzr for the diff between that and the previous version. --[[Joey]]
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