ikiwiki/doc/todo/inline:_numerical_ordering_by_title.mdwn

Could you please add numerical ordering by title to [[inline|plugins/inline]]
plugin? Now I can do only alphabetical order by title, but sometime it's not enough.

> Implemented, see [[natural_sorting]] [[!tag done]] --[[Joey]] 

BTW, it seems that ordering by title is rather ordering by filename of page.
For me "title" means title of page I can set using `title` parameter
of [[meta|plugins/meta]] plugin :)

Why do I need that feature? I've just been migrating an info site of our university
[mail system](http://poczta.uw.edu.pl/) to Ikiwiki from very static, console handling
Makefile+[WML](http://thewml.org/)+XML+XSL=HTML solution. I have many news files
(`1.mdwn`, `2.mdwn`, etc.) and unfortunately I did very stupid thing. I've commited
all of them in the same revision of our Subversion repo...

Now I have a problem with sorting these files using inline plugin. I can't do
sorting by age, because both old and young news files have the same age. I can't
sort by title too. For example, when I sort them by title, then `9.mdwn` page is
between `90.mdwn` and `89.mdwn` pages... It sucks, of course. Sorting by mtime
also is not a solution for me, because it means that I can't touch/fix old news
anymore.

Do you have any idea how to workaround that issue? --[[Paweł|ptecza]]

> Delete all files. Add files back one at a time, committing after adding
> each file. Sort by date. --[[Joey]]

>> The simplest solutions are the best :D Thanks for the hint! I didn't
>> want to do it before, because I was affaid that my Subversion keeps
>> old date of creation of file. --[[Paweł|ptecza]]

> Maybe you can rename `9.mdwn` to `09.mdwn`? See `rename(1)`, it renames multiple files
> in one go. --[[buo]]

>> Thanks for your suggestion! But what about if number of my news files grows to 100+?

>>     $ ls
>>     09.mdwn  100.mdwn  101.mdwn  102.mdwn  89.mdwn  90.mdwn

>> I don't want to rename all previous files to add `0` prefix. --[[Paweł|ptecza]]

>>> Rather than adding 0's or or a 'sorttype' parameter, I'd just fix the sort order.
>>> Both MacOS and Windows use a smarter sort order than just lexical in their
>>> file browsers (e.g. <http://support.microsoft.com/default.aspx?kbid=319827>,
>>> <http://docs.info.apple.com/article.html?artnum=300989>).
>>>
>>> The [Unicode Collation algorithm](http://en.wikipedia.org/wiki/Unicode_collation_algorithm)
>>> would seem to be a reasonable sort order.  (See also <http://www.unicode.org/unicode/reports/tr10/>.)
>>> Unfortunately the standard perl implementation, [Unicode::Collate](http://perldoc.perl.org/Unicode/Collate.html)
>>> doesn't handle the optional [numbers](http://www.unicode.org/unicode/reports/tr10/#Customization)
>>> extension which is what you want.  --[[Will]]

---

Below is my simple patch. Feel free to use it or comment!

I have also 2 considerations for inline sorting:

1. Maybe changing name of `sort` parameter to `sortby` or `sortkey` will
   be good idea?

   > No, that would break existing wikis. --[[Joey]]
   >> It's no problem. You just have `ikiwiki-transition` utility :D --[[Paweł|ptecza]]

1. Maybe you should use `title` sort key for title from meta plugin and `name`, 
   `filename`, `page` or `pagename` for page names? In the future you can also
   sort by meta author, license or another key.

   > There are many places in ikiwiki that do not use meta title info and
   > could. I'd prefer to deal with that issue as a whole, not here,
   > --[[Joey]]

--[[Paweł|ptecza]]

    --- inline.pm-orig  2008-09-02 09:53:20.000000000 +0200
    +++ inline.pm       2008-09-02 10:09:02.000000000 +0200
    @@ -186,7 +186,15 @@
        }

        if (exists $params{sort} && $params{sort} eq 'title') {
    -           @list=sort { pagetitle(basename($a)) cmp pagetitle(basename($b)) } @list;
    +           if (! $params{sorttype} || $params{sorttype} eq 'lexical') {
    +                   @list=sort { pagetitle(basename($a)) cmp pagetitle(basename($b)) } @list;
    +           }
    +           elsif ($params{sorttype} eq 'numeric') {
    +                   @list=sort { pagetitle(basename($a)) <=> pagetitle(basename($b)) } @list;
    +           }
    +           else {
    +                   return sprintf(gettext("unknown sort type %s"), $params{sorttype});
    +           }
        }
        elsif (exists $params{sort} && $params{sort} eq 'mtime') {
                @list=sort { $pagemtime{$b} <=> $pagemtime{$a} } @list;
    @@ -195,7 +203,7 @@
                @list=sort { $pagectime{$b} <=> $pagectime{$a} } @list;
        }
        else {
    -           return sprintf(gettext("unknown sort type %s"), $params{sort});
    +           return sprintf(gettext("unknown sort key %s"), $params{sort});
        }

        if (yesno($params{reverse})) {

> To users, "sort" already determines the type of sort. It can be by title,
> or by date, etc. Adding a separate "sorttype" value is thus fairly
> confusing. --[[Joey]]

>> OK. I will be more careful when I play with inline plugin :) --[[Paweł|ptecza]]

---

Joey, have you forgotten about that request? ;) --[[Paweł|ptecza]]

> Okie.  Here is a different [[patch]] based on my comment above.  It doesn't introduce
> a new key, but rather changes the title sorting order. Two caveats:

 * I've only tested this in `inline`, not the other places I changed the sort order.
 * I'm unsure if the regexp used in the split should be `/(-?\d+)/` instead of `/(\d+)/`.
    As written, '-' is interpreted as a hyphen rather than a minus sign.

> --[[Will]]

>> I"m not comfortable with tossing out perl's default collator and trying
>> to maintain some other one going forward. Especially not for such an
>> edge case. --[[Joey]]

>> Hi Will! Your idea looks interesting for me, but I'm affraid that it's too big
>> change in Ikiwiki... Maybe I'm wrong? ;) What do you think, Joey? --[[Paweł|ptecza]]

>>> It isn't that big a change.  It is just supplying a sort order to the sort.  The
>>> patch is a little larger because I then went through and made that sort
>>> order available in other places where it makes sense.  (Looking at the
>>> patch again briefly, I should have also used it in the `map` plugin.)
>>>
>>> If you wanted a simple patch, you could just move the `titlecmp` function
>>> into the inline plugin and only use it there.  The problem with that is that
>>> it only fixes the inline plugin. -- [[Will]]

>>>> Will, I agree with you that it's improved way of sort order. But on the other
>>>> hand I prefer to be careful when I change something in a several places,
>>>> because I don't want to break any working things when I fix one thing.
>>>> I hope that Joey agree with us too and all Ikiwiki users will be happy
>>>> after applying your patch ;) --[[Paweł|ptecza]]

----

    diff --git a/IkiWiki.pm b/IkiWiki.pm
    index c0f5dea..d001f8d 100644
    --- a/IkiWiki.pm
    +++ b/IkiWiki.pm
    @@ -20,7 +20,7 @@ use Exporter q{import};
     our @EXPORT = qw(hook debug error template htmlpage add_depends pagespec_match
                      bestlink htmllink readfile writefile pagetype srcfile pagename
                      displaytime will_render gettext urlto targetpage
    -		 add_underlay
    +		 add_underlay titlecmp
                      %config %links %pagestate %renderedfiles
                      %pagesources %destsources);
     our $VERSION = 2.00; # plugin interface version, next is ikiwiki version
    @@ -835,6 +835,42 @@ sub titlepage ($) {
     	return $title;
     }
     
    +sub titlecmp ($$) {
    +	my $titleA=shift;
    +	my $titleB=shift;
    +	
    +	my @listA=split(/(\d+)/,$titleA);
    +	my @listB=split(/(\d+)/,$titleB);
    +	
    +	while (@listA && @listB) {
    +		# compare bits of text
    +		my $a = shift @listA;
    +		my $b = shift @listB;
    +		my $c = ($a cmp $b);
    +		return $c if ($c);
    +
    +		if (@listA && @listB) {
    +			# compare numbers
    +			$a = shift @listA;
    +			$b = shift @listB;
    +			$c = $a <=> $b;
    +			return $c if ($c);
    +			
    +			# 01 is different to 1
    +			$c = (length($a) <=> length($b));
    +			return $c if ($c);
    +
    +			$c = ($a cmp $b);
    +			return $c if ($c);
    +		}
    +	}
    +	
    +	return 1 if (@listA);
    +	return -1 if (@listB);
    +	
    +	return 0;
    +}
    +
     sub linkpage ($) {
     	my $link=shift;
     	my $chars = defined $config{wiki_file_chars} ? $config{wiki_file_chars} : "-[:alnum:]+/.:_";
    diff --git a/IkiWiki/Plugin/brokenlinks.pm b/IkiWiki/Plugin/brokenlinks.pm
    index 37752dd..ccaa399 100644
    --- a/IkiWiki/Plugin/brokenlinks.pm
    +++ b/IkiWiki/Plugin/brokenlinks.pm
    @@ -59,7 +59,7 @@ sub preprocess (@) {
     			map {
     				"<li>$_</li>"
     			}
    -			sort @broken)
    +			sort titlecmp @broken)
     		."</ul>\n";
     }
     
    diff --git a/IkiWiki/Plugin/inline.pm b/IkiWiki/Plugin/inline.pm
    index 8efef3f..263e7a6 100644
    --- a/IkiWiki/Plugin/inline.pm
    +++ b/IkiWiki/Plugin/inline.pm
    @@ -192,7 +192,7 @@ sub preprocess_inline (@) {
     	}
     
     	if (exists $params{sort} && $params{sort} eq 'title') {
    -		@list=sort { pagetitle(basename($a)) cmp pagetitle(basename($b)) } @list;
    +		@list=sort { titlecmp(pagetitle(basename($a)),pagetitle(basename($b))) } @list;
     	}
     	elsif (exists $params{sort} && $params{sort} eq 'mtime') {
     		@list=sort { $pagemtime{$b} <=> $pagemtime{$a} } @list;
    diff --git a/IkiWiki/Plugin/orphans.pm b/IkiWiki/Plugin/orphans.pm
    index b910758..10a1d87 100644
    --- a/IkiWiki/Plugin/orphans.pm
    +++ b/IkiWiki/Plugin/orphans.pm
    @@ -56,7 +56,7 @@ sub preprocess (@) {
     				htmllink($params{page}, $params{destpage}, $_,
     					 noimageinline => 1).
     				"</li>"
    -			} sort @orphans).
    +			} sort titlecmp @orphans).
     		"</ul>\n";
     }
     
    diff --git a/IkiWiki/Render.pm b/IkiWiki/Render.pm
    index ceb7c84..00798e1 100644
    --- a/IkiWiki/Render.pm
    +++ b/IkiWiki/Render.pm
    @@ -89,7 +89,7 @@ sub genpage ($$) {
     		$template->param(have_actions => 1);
     	}
     
    -	my @backlinks=sort { $a->{page} cmp $b->{page} } backlinks($page);
    +	my @backlinks=sort { titlecmp($a->{page}, $b->{page}) } backlinks($page);
     	my ($backlinks, $more_backlinks);
     	if (@backlinks <= $config{numbacklinks} || ! $config{numbacklinks}) {
     		$backlinks=\@backlinks;