From: Mischa POSLAWSKY <perl@shiar.org>
Date: Sun, 22 Feb 2015 19:10:59 +0000 (+0100)
Subject: digraphs: smart deprecation of xorg alternates
X-Git-Tag: v1.7~86
X-Git-Url: http://git.shiar.nl/sheet.git/commitdiff_plain/eb571732118d75658b26ecc68a48682baadca000

digraphs: smart deprecation of xorg alternates
---

diff --git a/digraphs.plp b/digraphs.plp
index 1522bf4..718915d 100644
--- a/digraphs.plp
+++ b/digraphs.plp
@@ -1,4 +1,5 @@
 <(common.inc.plp)><:
+use 5.010;  # state
 
 Html({
 	title => 'digraph cheat sheet',
@@ -45,9 +46,29 @@ if (exists $get{xorg}) {
 	my $xorg = do 'data/digraphs-xorg.inc.pl'
 		or die "Error loading Xorg data: ", $@ // $!;
 	$_ = [ord $_] for values %{$xorg};
-	$xorg->{$_}->[2] =  # class = same as rfc | any other spec | xorg only
-		$di->{$_} ? $di->{$_}->[2] =~ /\bu-di\b/ ? 'l5' : 'l3' : 'l1'
+	$xorg->{$_}->[2] = # class = compatibility
+		$di->{$_} ? $di->{$_}->[0] != $xorg->{$_}->[0] ? 'l1' :  # conflict
+		$di->{$_}->[2] =~ /\bu-di\b/ ? 'l5' : 'l3' : 'l2'  # rfc|any|none
 		for keys %{$xorg};
+
+	for my $cp (map {$_->[0]} values %{$xorg}) {
+		next if (state $seen = {})->{$cp}++;  # List::MoreUtils::uniq
+
+		# find multiple equivalent mnemonics
+		my @equiv = grep {$cp eq $_->[0]}
+			map {$xorg->{$_}} sort keys %{$xorg}; # values ordered by mnem.
+
+		# search for the most compatible match
+		my ($compat) = sort {
+			$equiv[$b]->[2] cmp $equiv[$a]->[2]  # highest level
+			|| $b <=> $a  # fallback to last mnemonic
+		} 0 .. $#equiv;
+
+		# reclassify all but one as level 0 (omitted)
+		splice @equiv, $compat // -1, 1, ();
+		$_->[2] = 'l0 ex' for @equiv;
+	}
+
 	$chars2[0] = [qw( # ^ _ ` ~ )];
 	@chars = @chars2;
 	$di = $xorg;