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# First cut at using the readline history directly rather than reimplementing
# it. It does save history but it's a little crappy; still playing with it ;)
#
# epitaph, 22nd April 2007
package Devel::REPL::Plugin::ReadLineHistory;
use Devel::REPL::Plugin;
use File::HomeDir;
use File::Spec;
my $hist_file = $ENV{PERLREPL_HISTFILE} ||
File::Spec->catfile(File::HomeDir->my_home, '.perlreplhist');
# HISTLEN should probably be in a config file to stop people accidentally
# truncating their history if they start the program and forget to set
# PERLREPL_HISTLEN
my $hist_len=$ENV{PERLREPL_HISTLEN} || 100;
around 'run' => sub {
my $orig=shift;
my ($self, @args)=@_;
if ($self->term->ReadLine eq 'Term::ReadLine::Gnu') {
$self->term->stifle_history($hist_len);
}
if ($self->term->ReadLine eq 'Term::ReadLine::Perl') {
$self->term->Attribs->{MaxHistorySize} = $hist_len;
}
if (-f($hist_file)) {
if ($self->term->ReadLine eq 'Term::ReadLine::Gnu') {
$self->term->ReadHistory($hist_file);
}
if ($self->term->ReadLine eq 'Term::ReadLine::Perl') {
open HIST, $hist_file or die "ReadLineHistory: could not open $hist_file: $!\n";
while (my $line = <HIST>) {
chomp $line;
$self->term->addhistory($line);
}
close HIST;
}
}
$self->term->Attribs->{do_expand}=1; # for Term::ReadLine::Gnu
$self->term->MinLine(2); # don't save one letter commands
# let History plugin know we have Term::ReadLine support
$self->have_readline_history(1) if $self->can('have_readline_history');
$self->$orig(@args);
if ($self->term->ReadLine eq 'Term::ReadLine::Gnu') {
$self->term->WriteHistory($hist_file) ||
$self->print("warning: failed to write history file $hist_file");
}
if ($self->term->ReadLine eq 'Term::ReadLine::Perl') {
my @lines = $self->term->GetHistory() if $self->term->can('GetHistory');
if( open HIST, ">$hist_file" ) {
print HIST join("\n",@lines);
close HIST;
} else {
$self->print("warning: unable to WriteHistory to $hist_file");
}
}
};
1;
__END__
=head1 NAME
Devel::REPL::Plugin::ReadLineHistory - Integrate history with the facilities provided by L<Term::ReadLine>
=head1 DESCRIPTION
This plugin enables loading and saving command line history from
a file as well has history expansion of previous commands using
the !-syntax a la bash.
By default, history expansion is enabled with this plugin when
using L<Term::ReadLine::Gnu|Term::ReadLine::Gnu>. That means that
"loose" '!' characters will be treated as history events which
may not be what you wish.
To avoid this, you need to quote the '!' with '\':
my $var = "foo\!";
or place the arguments in single quotes---but enable the
C<Term::ReadLine> attribute C<history_quotes_inhibit_expansion>:
$_REPL->term->Attribs->{history_quotes_inhibit_expansion} = 1;
my $var = 'foo!';
and to disable history expansion from GNU readline/history do
$_REPL->term->Attribs->{do_expand} = 0;
=head1 CONFLICTS
Note that Term::ReadLine::Perl does not support a history
expansion method. In that case, you may wish to use the
Devel::REPL History plugin which provides similar functions.
Work is underway to make use of either History or
ReadLineHistory consistent for expansion with either the
Term::ReadLine::Gnu support or Term::ReadLine::Perl.
=cut
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