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149 lines
3.6 KiB
Raku
149 lines
3.6 KiB
Raku
use v6;
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module Term::ANSIColor;
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# these will be macros one day, yet macros can't be exported so far
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sub RESET is export { "\e[0m" }
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sub BOLD is export { "\e[1m" }
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sub UNDERLINE is export { "\e[4m" }
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sub INVERSE is export { "\e[7m" }
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sub BOLD_OFF is export { "\e[22m" }
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sub UNDERLINE_OFF is export { "\e[24m" }
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sub INVERSE_OFF is export { "\e[27m" }
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my %attrs =
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reset => "0",
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bold => "1",
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underline => "4",
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inverse => "7",
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black => "30",
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red => "31",
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green => "32",
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yellow => "33",
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blue => "34",
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magenta => "35",
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cyan => "36",
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white => "37",
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default => "39",
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on_black => "40",
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on_red => "41",
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on_green => "42",
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on_yellow => "43",
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on_blue => "44",
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on_magenta => "45",
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on_cyan => "46",
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on_white => "47",
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on_default => "49";
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sub color (Str $what) is export {
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my @res;
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my @a = $what.split(' ');
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for @a -> $attr {
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if %attrs.exists($attr) {
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@res.push: %attrs{$attr}
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} else {
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die("Invalid attribute name '$attr'")
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}
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}
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return "\e[" ~ @res.join(';') ~ "m";
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}
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sub colored (Str $what, Str $how) is export {
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color($how) ~ $what ~ color('reset');
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}
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sub colorvalid (*@a) is export {
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for @a -> $el {
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return False unless %attrs.exists($el)
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}
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return True;
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}
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sub colorstrip (*@a) is export {
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my @res;
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for @a -> $str {
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@res.push: $str.subst(/\e\[ <[0..9;]>+ m/, '', :g);
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}
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return @res.join;
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}
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sub uncolor (Str $what) is export {
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my @res;
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my @list = $what.comb(/\d+/);
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for @list -> $elem {
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if %attrs.reverse.exists($elem) {
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@res.push: %attrs.reverse{$elem}
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} else {
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die("Bad escape sequence: {'\e[' ~ $elem ~ 'm'}")
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}
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}
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return @res.join(' ');
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}
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=begin pod
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=head1 NAME
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Term::ANSIColor - Color screen output using ANSI escape sequences
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=head1 SYNOPSIS
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use Term::ANSIColor;
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say color('bold'), "this is in bold", color('reset');
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say colored('underline red on_green', 'what a lovely colours!');
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say BOLD, 'good to be fat!', BOLD_OFF;
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say 'ok' if colorvalid('magenta', 'on_black', 'inverse');
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say '\e[36m is ', uncolor('\e36m');
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say colorstrip("\e[1mThis is bold\e[0m");
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=head1 DESCRIPTION
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Term::ANSIColor provides an interface for using colored output
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in terminals. The following functions are available:
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=head2 C<color()>
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Given a string with color names, the output produced by C<color()>
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sets the terminal output so the text printed after it will be colored
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as specified. The following color names are recognised:
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reset bold underline inverse black red green yellow blue
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magenta cyan white default on_black on_red on_green on_yellow
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on_blue on_magenta on_cyan on_white on_default
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The on_* family of colors correspond to the background colors.
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=head2 C<colored()>
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C<colored()> is similar to C<color()>. It takes two Str arguments,
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where the first is the colors to be used, and the second is the string
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to be colored. The C<reset> sequence is automagically placed after
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the string.
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=head2 C<colorvalid()>
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C<colorvalid()> gets an array of color specifications (like those
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passed to C<color()>) and returns true if all of them are valid,
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false otherwise.
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=head2 C<colorstrip()>
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C<colorstrip>, given a string, removes all the escape sequences
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in it, leaving the plain text without effects.
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=head2 C<uncolor()>
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Given escape sequences, C<uncolor()> returns a string with readable
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color names. E.g. passing "\e[36;44m" will result in "cyan on_blue".
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=head1 Constants
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C<Term::ANSIColor> provides constants which are just strings of
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appropriate escape sequences. The following constants are available:
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RESET BOLD UNDERLINE INVERSE BOLD_OFF UNDERLINE_OFF INVERSE_OFF
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=end pod
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# vim: ft=perl6
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