initial implementation

1 files changed, 38 insertions, 0 deletions

diff --git a/lib/circular/require.pm b/lib/circular/require.pm
index e69de29..882b2b7 100644
--- a/lib/circular/require.pm
+++ b/lib/circular/require.pm
@@ -0,0 +1,38 @@
+package circular::require;
+use strict;
+use warnings;
+use Package::Stash;
+
+my %seen;
+my $saved;
+
+sub _require {
+    my ($file) = @_;
+    if (exists $seen{$file} && !$seen{$file}) {
+        warn "Circular require detected: $file (from " . caller() . ")\n";
+    }
+    $seen{$file} = 0;
+    my $ret = $saved ? $saved->($file) : CORE::require($file);
+    $seen{$file} = 1;
+    return $ret;
+}
+
+sub import {
+    my $stash = Package::Stash->new('CORE::GLOBAL');
+    if ($saved) {
+        $stash->add_package_symbol('&require' => $saved);
+    }
+    else {
+        $stash->remove_package_symbol('&require');
+    }
+}
+
+sub unimport {
+    my $stash = Package::Stash->new('CORE::GLOBAL');
+    my $old_require = $stash->get_package_symbol('&require');
+    $saved = $old_require
+        if defined($old_require) && $old_require != \&_require;
+    $stash->add_package_symbol('&require', \&_require);
+}
+
+1;