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package Reply::Plugin::ReadLine;
use strict;
use warnings;
# ABSTRACT: use Term::ReadLine for user input
use base 'Reply::Plugin';
use File::HomeDir;
use File::Spec;
use Scalar::Util 'weaken';
use Term::ReadLine;
=head1 SYNOPSIS
; .replyrc
[ReadLine]
history_file = '.hist'
history_length = 100
=head1 DESCRIPTION
This plugin uses L<Term::ReadLine> to read lines from the user. This enables
useful features such as line editing and command history. The history will be
persisted between runs, by default in C<~/.reply_history>, although this is
changeable with the C<history_file> option. To limit the number of lines
written to this file, you can use the C<history_length> option. Setting a
C<history_length> of C<0> will disable writing history to a file entirely.
NOTE: you probably want to install a reasonable L<Term::ReadLine> backend in
order for this plugin to be very useful. L<Term::ReadLine::Gnu> is highly
recommended if possible.
=cut
sub new {
my $class = shift;
my %opts = @_;
my $self = $class->SUPER::new(@_);
$self->{term} = Term::ReadLine->new('Reply');
my $history = $opts{history_file} || '.reply_history';
$self->{history_file} = File::Spec->catfile(
(File::Spec->file_name_is_absolute($history)
? ()
: (File::HomeDir->my_data)),
$history
);
if ($self->{term}->ReadLine eq 'Term::ReadLine::Gnu') {
$self->{term}->StifleHistory($opts{history_length})
if defined $opts{history_length} && $opts{history_length} >= 0;
}
if (open my $fh, '<', $self->{history_file}) {
for my $line (<$fh>) {
chomp $line;
$self->{term}->addhistory($line);
}
}
else {
my $e = $!;
warn "Couldn't open $self->{history_file} for reading: $e"
if -e $self->{history_file};
}
$self->_register_tab_complete;
return $self;
}
sub read_line {
my $self = shift;
my ($next, $prompt) = @_;
return $self->{term}->readline($prompt);
}
sub DESTROY {
my $self = shift;
return if defined $self->{history_length} && $self->{history_length} == 0;
# XXX support more later
return unless $self->{term}->ReadLine eq 'Term::ReadLine::Gnu';
$self->{term}->WriteHistory($self->{history_file})
or warn "Couldn't write history to $self->{history_file}";
}
sub _register_tab_complete {
my $self = shift;
my $term = $self->{term};
weaken(my $weakself = $self);
if ($term->ReadLine eq 'Term::ReadLine::Gnu') {
$term->Attribs->{attempted_completion_function} = sub {
my ($text, $line, $start, $end) = @_;
# discard everything after the cursor for completion purposes
substr($line, $end) = '';
my @matches = $weakself->publish('tab_handler', $line);
my $match_index = 0;
return $term->completion_matches($text, sub {
my ($text, $index) = @_;
return $matches[$index];
});
};
}
}
1;
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