Here is a patch that makes [[ikiwiki-calendar]] almost useless.
+> [[merged|done]], thanks! --[[smcv]]
+
It adds some options, the main one being `calendar_autocreate`, which is
similar to the `tag_autocreate` option of the [[tag|plugins/tag]]: it create
archive pages when needed.
>
> I think that should be `ikiwiki --setup ~/ikiwiki.setup --refresh`
>
+> > [[Corrected|https://github.com/paternal/ikiwiki/commit/213dad76d47bab9db8e44d6e20c8371960375e77]]
+>
> The indentation of some of the new code in `IkiWiki/Plugin/calendar.pm`
> is weird. Please use one hard tab (U+0009) per indent step: you seem
> to have used a mixture of one hard tab per indent or two spaces
> per indent, which looks bizarre for anyone whose tab size is not
> 2 spaces.
>
+> > [[Corrected|https://github.com/paternal/ikiwiki/commit/1d97160dae775c31e166d9886472dacdd773d571]]
+>
> + return unless $config{calendar_autocreate};
>
> This is checked in `gencalendaryear` but not in `gencalendarmonth`.
> Shouldn't `gencalendarmonth` do it too? Alternatively, do the check
> in `scan`, which calls `gencalendarmonth` directly.
>
+> > Once again, [[you are right|https://github.com/paternal/ikiwiki/commit/473bcbe7a42a4168cab82ed12185817248de045f]]
+>
> + my $year = $date[5] + 1900;
>
> You calculate this, but you don't seem to do anything with it?
>
+> > [[Corrected|https://github.com/paternal/ikiwiki/commit/d0b34951240317642543351ec62f98d3d8df8c0f]]
+>
> + if (not exists $changed{$params{year}}) {
> + $changed{$params{year}} = ();
> + }
> + $changed{$params{year}}{$params{month}} = 1;
>
-> $changed{$params{year}} is a scalar but `()` is a list. I think you want `{}`
+> `$changed{$params{year}}` is a scalar (you can tell because it starts with the
+> `$` sigil) but `()` is a list. I think you want `{}`
> (a scalar that is a reference to an empty anonymous hash).
>
> However, that whole `if` block can be omitted, and you can just use
> `$changed{$params{year}}{$params{month}} = 1;`, because Perl will automatically
-> create $changed{$params{year}} as a reference to a hash (the term to look
+> create `$changed{$params{year}}` as a reference to an empty hash if necessary,
+> in order to put the pair `$params{month} => 1` in it (the term to look
> up if you're curious is "autovivification").
>
+> > [[Corrected|https://github.com/paternal/ikiwiki/commit/d0b34951240317642543351ec62f98d3d8df8c0f]]
+>
> --[[smcv]]
+>
+> > Thank you for your review.
+> > --[[Louis|spalax]]