keys: graphical representation of linux control keys

[sheet.git] / Shiar_Sheet / Keyboard.pm

diff --git a/Shiar_Sheet/Keyboard.pm b/Shiar_Sheet/Keyboard.pm
index 44ecc4d67adbbdf9bb2e3ccd3c14372850e1fcf0..98c5a40a330a774e564464f4ceb005db21227ce0 100644 (file)
--- a/Shiar_Sheet/Keyboard.pm
+++ b/Shiar_Sheet/Keyboard.pm
@@ -14,12 +14,12 @@ my %keyrows = do 'keys.inc.pl';
 # add first two cases of each row again with each char prepended by + (alt)
 push @$_, map { [map {"+$_"} @$_] } @$_[0,1] for map {@$_} values %keyrows;
 
-my %keytrans = qw(
-       ^@ NUL ^a SOH ^b STX ^c ETX  ^d EOT ^e ENQ ^f ACK ^g BEL
-       ^h BS  ^i tab ^j LF  ^k VT   ^l FF  ^m CR  ^n SO  ^o SI
-       ^p DLE ^q DC1 ^r DC2 ^s DC3  ^t DC4 ^u NAK ^v SYN ^w ETB
-       ^x CAN ^y EM  ^z SUB ^[ ESC  ^\ FS  ^] GS  ^^ RS  ^_ US
-       ^? DEL
+my %keytrans = (
+       '^h' => "\x{232B}", # BS
+       '^i' => "\x{21E5}", # TAB
+       '^m' => "\x{21B5}", # CR
+       '^?' => "\x{2326}", # DEL
+       '^[' => "\x{238B}", # ESC
 );
 
 sub new {
@@ -89,6 +89,19 @@ sub keyunalias {
        return $self->keyunalias($keyinfo, $ancestry);
 }
 
+sub print_letter {
+       my $self = shift;
+       my ($key, $mode) = @_;
+
+       return if $key eq '^0';
+       return 'Esc' if $key eq "\e";
+       return $keytrans{$key} if defined $keytrans{$key};
+       my $html = $self->{def}{$mode}{lead} . escapehtml($key);
+          $html =~ s{\^(?=.)}{<small>^</small>};  # element around ctrl-identifier
+          $html =~ s{\+(?=.)}{<small>+</small>};  # meta
+       return $html;
+}
+
 sub print_key {
        my $self = shift;
        my ($mode, $key, $flags) = @_;
@@ -106,12 +119,9 @@ sub print_key {
                ($desc, $mnem) = split /\n/, $self->escapedesc($txt);
        }
 
-#      $key = $keytrans{$key} if defined $keytrans{$key};
-       my $keytxt = $key eq "\e" ? 'Esc' : $self->{def}{$mode}{lead} . escapehtml($key) if $key ne '^0';
+       my $keytxt = $self->print_letter($key, $mode);
           $keytxt .= $self->{sign}->{$1} while $flags =~ s/(?:^| )(arg[a-ln-z]?)\b//;  # arguments
           $keytxt .= "<small>$self->{sign}->{motion}</small>" if $flags =~ s/ ?\bargm\b//;  # motion argument
-          $keytxt =~ s{\^(?=.)}{<small>^</small>};  # element around ctrl-identifier
-          $keytxt =~ s{\+(?=.)}{<small>+</small>};  # meta
        my $keyhint = defined($mnem) && qq{ title="$mnem"};
           $keytxt  = "<b$keyhint>$keytxt</b>";
           $keytxt .= ' '.$desc if defined $desc;