RT57113: Easier to support completion

[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 ae4a8ec..e99ef09 100644 (file)
--- a/lib/Devel/REPL/Plugin/Completion.pm
+++ b/lib/Devel/REPL/Plugin/Completion.pm
@@ -5,60 +5,109 @@ use PPI;
 use namespace::clean -except => [ 'meta' ];
 
 has current_matches => (
-    is => 'rw',
-    isa => 'ArrayRef',
-    lazy => 1,
-    default => sub { [] },
+  is => 'rw',
+  isa => 'ArrayRef',
+  lazy => 1,
+  default => sub { [] },
 );
 
 has match_index => (
-    is => 'rw',
-    isa => 'Int',
-    lazy => 1,
-    default => sub { 0 },
+  is => 'rw',
+  isa => 'Int',
+  lazy => 1,
+  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(@_);
   };
-}
+
+  $self->term->Attribs->{completion_function} = sub {
+    $weakself->_completion(@_);
+  };
+};
 
 sub _completion {
+  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
-  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];
-  });
+  if ($is_trp) {
+     return @matches;
+  } else {
+     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];
+        });
+  }
 }
 
 sub complete {
   return ();
 }
 
+# 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;
+}
+
 1;
 
+__END__
+
+=head1 NAME
+
+Devel::REPL::Plugin::Completion - Extensible tab completion
+
+=head1 AUTHOR
+
+Shawn M Moore, C<< <sartak at gmail dot com> >>
+
+=cut
+