Add ReadLine file completion if no other matches

[p5sagit/Devel-REPL.git] / lib / Devel / REPL / Plugin / Completion.pm

diff --git a/lib/Devel/REPL/Plugin/Completion.pm b/lib/Devel/REPL/Plugin/Completion.pm
index e9ac902..91424ae 100644 (file)
--- a/lib/Devel/REPL/Plugin/Completion.pm
+++ b/lib/Devel/REPL/Plugin/Completion.pm
@@ -18,51 +18,110 @@ has match_index => (
   default => sub { 0 },
 );
 
-sub BEFORE_PLUGIN {
+has no_term_class_warning => (
+  isa => "Bool",
+  is  => "rw",
+  default => 0,
+);
+
+before 'read' => sub {
   my ($self) = @_;
 
+  if ((!$self->term->isa("Term::ReadLine::Gnu") and !$self->term->isa("Term::ReadLine::Perl"))
+        and !$self->no_term_class_warning) {
+     warn "Term::ReadLine::Gnu or Term::ReadLine::Perl is required for the Completion plugin to work";
+     $self->no_term_class_warning(1);
+  }
+
   my $weakself = $self;
   weaken($weakself);
 
-  $self->term->Attribs->{attempted_completion_function} = sub {
-    $weakself->_completion(@_);
-  };
-}
+  if ($self->term->isa("Term::ReadLine::Gnu")) {
+     $self->term->Attribs->{attempted_completion_function} = sub {
+        $weakself->_completion(@_);
+     };
+  }
+
+  if ($self->term->isa("Term::ReadLine::Perl")) {
+     $self->term->Attribs->{completion_function} = sub {
+        $weakself->_completion(@_);
+     };
+  }
+
+};
 
 sub _completion {
-  my ($self, $text, $line, $start, $end) = @_;
+   my $is_trp = scalar(@_) == 4 ? 1 : 0;
+   my ($self, $text, $line, $start, $end) = @_;
+   $end = $start+length($text) if $is_trp;
+
+   # we're discarding everything after the cursor for completion purposes
+   # we can't just use $text because we want all the code before the cursor to
+   # matter, not just the current word
+   substr($line, $end) = '';
+
+   my $document = PPI::Document->new(\$line);
+   return unless defined($document);
+
+   $document->prune('PPI::Token::Whitespace');
+
+   my @matches = $self->complete($text, $document);
+
+   # iterate through the completions
+   if ($is_trp) {
+      if (scalar(@matches)) {
+         return @matches;
+      } else {
+         return readline::rl_filename_list($text);
+      }
+   } else {
+      if (scalar(@matches)) {
+         return $self->term->completion_matches($text, sub {
+               my ($text, $state) = @_;
+
+               if (!$state) {
+                  $self->current_matches(\@matches);
+                  $self->match_index(0);
+               }
+               else {
+                  $self->match_index($self->match_index + 1);
+               }
+
+               return $self->current_matches->[$self->match_index];
+            });
+      } else {
+         # fall back to filename completion for Term::ReadLine::Gnu
+         return;
+      }
+   }
+}
 
-  # we're discarding everything after the cursor for completion purposes
-  # we can't just use $text because we want all the code before the cursor to
-  # matter, not just the current word
-  substr($line, $end) = '';
+sub complete {
+  return ();
+}
 
-  my $document = PPI::Document->new(\$line);
-  return unless defined($document);
+# recursively find the last element
+sub last_ppi_element {
+  my ($self, $document, $type) = @_;
+  my $last = $document;
+  while ($last->can('last_element') && defined($last->last_element)) {
+    $last = $last->last_element;
+    return $last if $type && $last->isa($type);
+  }
+  return $last;
+}
 
-  $document->prune('PPI::Token::Whitespace');
+1;
 
-  my @matches = $self->complete($text, $document);
+__END__
 
-  # iterate through the completions
-  return $self->term->completion_matches($text, sub {
-    my ($text, $state) = @_;
+=head1 NAME
 
-    if (!$state) {
-      $self->current_matches(\@matches);
-      $self->match_index(0);
-    }
-    else {
-      $self->match_index($self->match_index + 1);
-    }
+Devel::REPL::Plugin::Completion - Extensible tab completion
 
-    return $self->current_matches->[$self->match_index];
-  });
-}
+=head1 AUTHOR
 
-sub complete {
-  return ();
-}
+Shawn M Moore, C<< <sartak at gmail dot com> >>
 
-1;
+=cut