Omit doc generation scripts from release

Also tweak the HTML handling in Build.PL to live in the subclass, and
teach `bin/format_l10n_docs` to parse `.md` or `.mmd` files.

Build.PL

@@ -15,6 +15,9 @@ my $class = $build_pkg->subclass(
                 $self->tap_harness_args->{sources}{pgTAP}{username}
                     ||= $self->$meth
             }
+
+            # Add html files in lib.
+            $self->add_build_element('html');
             return $self;
         }
         sub ACTION_tarball_name { print shift->dist_dir . ".tar.gz\n" }
@@ -40,7 +43,7 @@ my $class = $build_pkg->subclass(
     },
 );
 
-my $build = $class->new(
+$class->new(
     module_name        => 'PGXN::Manager',
     license            => 'postgresql',
     script_files       => 'bin',
@@ -159,8 +162,4 @@ my $build = $class->new(
             repository => 'https://github.com/pgxn/pgxn-manager/',
         }
     },
-);
-
-# Add html files in lib.
-$build->add_build_element('html');
-$build->create_build_script;
+)->create_build_script;

MANIFEST.SKIP

@@ -5,7 +5,7 @@
 \B\.svn\b
 \B\.git
 
-# Avoid Makemaker generated and utility files.
+# Avoid MakeMaker generated and utility files.
 ^Makefile$
 \bblib
 \bMakeMaker-\d
@@ -28,6 +28,8 @@
 
 # Avoid build files.
 ^PGXN-Manager
+^bin/format_l10n_docs
+^bin/gendoc
 
 # Avoid Pod tests.
 t/pod[^.]*\.t

bin/format_l10n_docs

@@ -1,6 +1,6 @@
 #!/usr/bin/env perl -w
 
-# Find all .md files in lib, run them through multimarkdown, and write
+# Find all .mm?d files in lib, run them through multimarkdown, and write
 # to .html.
 #
 # brew install multimarkdown
@@ -15,9 +15,9 @@ use File::Basename qw(basename);
 find({
     no_chdir => 1,
     wanted => sub {
-        return unless /\.md$/;
+        return unless /\.mm?d$/;
         my $src = $File::Find::name;
-        my $dst = $src =~ s/\.md$/.html/r;
+        my $dst = $src =~ s/\.mm?d$/.html/r;
         my @cmd = ('multimarkdown', $src, '-o', $dst);
         system(@cmd) == 0  or die "system @cmd failed: $?\n"
     },