Add 5to6-perlfunc functions to index under a hidden category. This fixes

 Raku#407

htmlify.p6

@@ -35,6 +35,7 @@ use experimental :pack;
 my $type-graph;
 my %routines-by-type;
 my %*POD2HTML-CALLBACKS;
+my %p5to6-functions;
 
 # TODO: Generate menulist automatically
 my @menu =
@@ -227,6 +228,11 @@ sub process-pod-source(:$kind, :$pod, :$filename, :$pod-is-complete) {
 
     find-definitions :$pod, :$origin, :url("/$kind/$filename");
     find-references  :$pod, :$origin, :url("/$kind/$filename");
+
+    # Special handling for 5to6-perlfunc
+    if $filename eq '5to6-perlfunc' {
+      find-p5to6-functions( :$pod, :$origin, :url("/$kind/$filename"))
+    }
 }
 
 # XXX: Generalize
@@ -320,6 +326,18 @@ sub find-references(:$pod!, :$url, :$origin) {
     }
 }
 
+sub find-p5to6-functions(:$pod!, :$url, :$origin) {
+  if $pod ~~ Pod::Item  {
+      my $func-name = ~$pod.contents[0].contents;
+      %p5to6-functions{$func-name} = 1;
+  }
+  elsif $pod.?contents {
+      for $pod.contents -> $sub-pod {
+          find-p5to6-functions(:pod($sub-pod), :$url, :$origin) if $sub-pod ~~ Pod::Block;
+      }
+  }
+}
+
 sub register-reference(:$pod!, :$origin, :$url) {
     if $pod.meta {
         for @( $pod.meta ) -> $meta {
@@ -602,15 +620,19 @@ sub write-search-file () {
     sub escape(Str $s) {
         $s.trans([</ \\ ">] => [<\\/ \\\\ \\">]);
     }
-    my $items = $*DR.get-kinds.map(-> $kind {
+    my @items = $*DR.get-kinds.map(-> $kind {
         $*DR.lookup($kind, :by<kind>).categorize({escape .name})\
             .pairs.sort({.key}).map: -> (:key($name), :value(@docs)) {
                 qq[[\{ category: "{
                     ( @docs > 1 ?? $kind !! @docs.[0].subkinds[0] ).wordcase
                 }", value: "$name", url: "{@docs.[0].url}" \}]] #"
             }
-    }).flat.join(",\n");
-    spurt("html/js/search.js", $template.subst("ITEMS", $items));
+    }).flat;
+    @items.append( %p5to6-functions.keys.map( {
+      my $url = "/language/5to6-perlfunc.html#" ~ uri_escape($_);
+      sprintf( q[[{ category: "5to6-perlfunc", value: "%s", url: "%s" }]], $_, $url);
+    }) );
+    spurt("html/js/search.js", $template.subst("ITEMS", @items.join(",\n") ));
 }
 
 sub write-disambiguation-files () {