charset: link specific pages back to overview

[sheet.git] / charset.plp

diff --git a/charset.plp b/charset.plp
index e82e3d7b25f07412a26a22805f653a702bb04664..9dd98a4028a60dc1b9310033561726700b42c266 100644 (file)
--- a/charset.plp
+++ b/charset.plp
@@ -43,7 +43,7 @@ sub optionlink {
 print join " •\n", (
        map {
                join " ·\n", pairmap {
-                       optionlink($b || ucfirst $a, "/charset/$a?compare", $a eq $Request);
+                       optionlink($b || ucfirst $a, '/charset'.($a && "/$a?compare"), $a eq $Request);
                } @{$_}
        }
        [
@@ -51,6 +51,7 @@ print join " •\n", (
                dos      => 'DOS',
                mac      => 'Apple',
                ebcdic   => 'EBCDIC',
+               $tablist[0] eq 'default' ? () : ('' => 'common'),
        ],
        [
                westeur  => 'West',
@@ -297,14 +298,21 @@ sub tabinput {
                        }
                        $row{endpoint} -= $row{offset};
 
-                       if ($row{set} eq 'cp437' and !$row{offset}) {
-                               substr($row{table}, 237, 1) = pack 'U*', 0x3D5; # phi sign
-                               substr($row{table}, 0, 32) = pack 'U*', map {hex} qw(
-                                       2007 263A 263B 2665 2666 2663 2660 2022
-                                       25D8 25CB 25D9 2642 2640 266A 266B 263C
-                                       25BA 25C4 2195 203C 00B6 00A7 25AC 21A8
-                                       2191 2193 2192 2190 221F 2194 25B2 25BC
-                               );
+                       if ($row{set} eq 'cp437') {
+                               for my $phipos (237 - $row{offset}) {
+                                       next if $phipos < 0 or $phipos > $row{endpoint};
+                                       # replace phi glyph
+                                       substr($row{table}, $phipos, 1) = pack 'U*', 0x3D5;
+                               }
+                               if ($row{offset} == 0) {
+                                       # replace control characters by visible variants
+                                       substr($row{table}, 0, 32) = pack 'U*', map {hex} qw(
+                                               2007 263A 263B 2665 2666 2663 2660 2022
+                                               25D8 25CB 25D9 2642 2640 266A 266B 263C
+                                               25BA 25C4 2195 203C 00B6 00A7 25AC 21A8
+                                               2191 2193 2192 2190 221F 2194 25B2 25BC
+                                       );
+                               }
                        }
 
                        $visible->{ascii} =  # assume common base