Index: misc/findcombinable.pl
===================================================================
--- misc/findcombinable.pl	(revision 68d6d5b003efbd06a48bd9933929cbe463738ee2)
+++ misc/findcombinable.pl	(revision 68d6d5b003efbd06a48bd9933929cbe463738ee2)
@@ -0,0 +1,52 @@
+#! /usr/bin/perl -w
+
+use strict;
+use warnings;
+use utf8;
+use encoding 'utf-8';
+
+use Unicode::Normalize qw(NFC NFKC);
+
+my $top = shift @ARGV || exit;
+if (! -d $top) { exit; }
+
+checkdir($top);
+
+sub combinable {
+    my $str = shift @_;
+    
+    if ($str ne NFC($str)) {
+        return 1;
+    }
+    if ($str ne NFKC($str)) {
+        return 1;
+    }
+    
+    return '';
+}
+
+sub checkdir {
+    my $target = shift @_;
+    
+    print STDERR "checking '$target'\n";
+    opendir(my $dir, $target) || return $target;
+    my @entries = sort readdir($dir);
+    closedir($dir);
+    
+    my @dirs;
+    while (my $entry = shift @entries) {
+        next if ($entry =~ /^\.+$/);
+        if (combinable($entry)) {
+            print "'$target/$entry' can be composed\n";
+            next;
+        }
+        if (-d "$target/$entry") {
+            push @dirs, $entry;
+            next;
+        }
+    }
+    
+    while (my $entry = pop @dirs) {
+        checkdir("$target/$entry");
+    }
+}