lib/Devel/REPL/Plugin/ReadLineHistory.pm

   1 # First cut at using the readline history directly rather than reimplementing
   2 # it. It does save history but it's a little crappy; still playing with it ;)
   3 #
   4 # epitaph, 22nd April 2007
   5
   6 package Devel::REPL::Plugin::ReadLineHistory;
   7
   8 use Devel::REPL::Plugin;
   9 use File::HomeDir;
  10 use File::Spec;
  11
  12 my $hist_file = $ENV{PERLREPL_HISTFILE} ||
  13     File::Spec->catfile(File::HomeDir->my_home, '.perlreplhist');
  14
  15 # HISTLEN should probably be in a config file to stop people accidentally
  16 # truncating their history if they start the program and forget to set
  17 # PERLREPL_HISTLEN
  18 my $hist_len=$ENV{PERLREPL_HISTLEN} || 100;
  19
  20 around 'run' => sub {
  21   my $orig=shift;
  22   my ($self, @args)=@_;
  23   if ($self->term->Attribs->{ReadLine} eq 'Term::ReadLine::Gnu') {
  24      $self->term->stifle_history($hist_len);
  25   }
  26   if ($self->term->Attribs->{ReadLine} eq 'Term::ReadLine::Perl') {
  27      $self->term->Attribs->{MaxHistorySize} = $hist_len;
  28   }
  29   -f($hist_file) && $self->term->ReadHistory($hist_file);
  30   $self->term->Attribs->{do_expand}=1;
  31   $self->$orig(@args);
  32   $self->term->WriteHistory($hist_file) ||
  33     $self->print("warning: failed to write history file $hist_file");
  34 };
  35
  36 1;
  37
  38 __END__
  39
  40 =head1 NAME
  41
  42 Devel::REPL::Plugin::ReadLineHistory - Integrate history with the facilities provided by L<Term::ReadLine>
  43
  44 =cut
  45