add a (sort of hacked together) plugin to tab complete lexicals

1 files changed, 90 insertions, 0 deletions

diff --git a/lib/Reply/Plugin/Autocomplete/Lexicals.pm b/lib/Reply/Plugin/Autocomplete/Lexicals.pm
new file mode 100644
index 0000000..47f9a95
--- /dev/null
+++ b/lib/Reply/Plugin/Autocomplete/Lexicals.pm
@@ -0,0 +1,90 @@
+package Reply::Plugin::Autocomplete::Lexicals;
+use strict;
+use warnings;
+# ABSTRACT: tab completion for lexical variables
+
+use base 'Reply::Plugin';
+
+use PadWalker 'peek_sub';
+
+=head1 SYNOPSIS
+
+  ; .replyrc
+  [ReadLine]
+  [Autocomplete::Lexicals]
+
+=head1 DESCRIPTION
+
+This plugin registers a tab key handler to autocomplete lexical variables in
+Perl code.
+
+=cut
+
+# XXX unicode?
+my $var_name_rx = qr/[\$\@\%]([A-Z_a-z][0-9A-Z_a-z]*)?/;
+
+sub new {
+    my $class = shift;
+
+    my $self = $class->SUPER::new(@_);
+    $self->{env} = {};
+
+    return $self;
+}
+
+sub compile {
+    my $self = shift;
+    my ($next, @args) = @_;
+
+    my ($code) = $next->(@args);
+
+    # XXX this is just copied from LexicalPersistence, which sucks first
+    # because of copying and pasting code, and second because it doesn't catch
+    # anything that wouldn't be caught by LexicalPersistence (setting lexicals
+    # via Devel::StackTrace::WithLexicals (Carp::Reply), setting extra lexicals
+    # (ResultCache))
+    # we really need a way to broadcast various bits of information among
+    # plugins
+    $self->{env} = {
+        %{ $self->{env} },
+        %{ peek_sub($code) },
+    };
+
+    return $code;
+}
+
+sub tab_handler {
+    my $self = shift;
+    my ($line) = @_;
+
+    my ($var) = $line =~ /($var_name_rx)$/;
+    return unless $var;
+
+    my ($sigil, $name_prefix) = $var =~ /(.)(.*)/;
+
+    my @results;
+    for my $env_var (keys %{ $self->{env} }) {
+        my ($env_sigil, $env_name) = $env_var =~ /(.)(.*)/;
+
+        next unless index($env_name, $name_prefix) == 0;
+
+        if ($sigil eq $env_sigil) {
+            push @results, $env_name;
+        }
+        elsif ($env_sigil eq '@' && $sigil eq '$') {
+            push @results, "$env_name\[";
+        }
+        elsif ($env_sigil eq '%') {
+            push @results, "$env_name\{";
+        }
+    }
+
+    return @results;
+}
+
+=for Pod::Coverage
+  tab_handler
+
+=cut
+
+1;