Devel::REPL::Plugin::Colors - add color to return values, warnings, and errors

Devel-REPL documentation Contained in the Devel-REPL distribution.

Index

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NAME

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Devel::REPL::Plugin::Colors - add color to return values, warnings, and errors

SYNOPSIS

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    #!/usr/bin/perl 

    use lib './lib';
    use Devel::REPL;

    my $repl = Devel::REPL->new;
    $repl->load_plugin('LexEnv');
    $repl->load_plugin('History');
    $repl->load_plugin('Colors');
    $repl->run;

DESCRIPTION

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Colors are very pretty.

This plugin causes certain prints, warns, and errors to be colored. Generally the return value(s) of each line will be colored green (you can override this by setting $_REPL->normal_color in your rcfile). Warnings and compile/runtime errors will be colored with $_REPL->error_color. This plugin uses Term::ANSIColor, so consult that module for valid colors. The defaults are actually 'green' and 'bold red'.

SEE ALSO

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Devel::REPL

AUTHOR

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Shawn M Moore, <sartak at gmail dot com>

COPYRIGHT AND LICENSE

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Copyright (C) 2007 by Shawn M Moore

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

Devel-REPL documentation Contained in the Devel-REPL distribution. 
package Devel::REPL::Plugin::Colors;

use Devel::REPL::Plugin;
use Term::ANSIColor;
use namespace::clean -except => [ 'meta' ];

has normal_color => (
  is => 'rw', lazy => 1,
  default => 'green',
);

has error_color => (
  is => 'rw', lazy => 1,
  default => 'bold red',
);

around format_error => sub {
  my $orig = shift;
  my $self = shift;
  return color($self->error_color)
       . $orig->($self, @_)
       . color('reset');
};

# we can't just munge @_ because that screws up DDS
around format_result => sub {
  my $orig = shift;
  my $self = shift;
  no warnings 'uninitialized';
  return join "", (
    color($self->normal_color),
    $orig->($self, @_),
    color('reset'),
  );
};

# make arbitrary warns colored -- somewhat difficult because warn doesn't
# get $self, so we localize $SIG{__WARN__} during eval so it can get
# error_color

sub _wrap_warn {
  my $orig = shift;
  my $self = shift;

  local $SIG{__WARN__} = sub {
    my $warning = shift;
    chomp $warning;
    warn color($self->error_color || 'bold red')
       . $warning
       . color('reset')
       . "\n";
  };

  $orig->($self, @_);
};

around compile => \&_wrap_warn;
around execute => \&_wrap_warn;

1;

__END__