From afab14beccad1c7d6cbbfe8ac4db893c96fab70a Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Tue, 5 Apr 2011 20:57:36 -0500
Subject: initial implementation

---
 lib/Class/Refresh.pm | 154 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)

(limited to 'lib')

diff --git a/lib/Class/Refresh.pm b/lib/Class/Refresh.pm
index e69de29..9eea260 100644
--- a/lib/Class/Refresh.pm
+++ b/lib/Class/Refresh.pm
@@ -0,0 +1,154 @@
+package Class::Refresh;
+use strict;
+use warnings;
+
+use Class::Unload;
+use Class::Load;
+
+our %CACHE;
+
+sub refresh {
+    my $class = shift;
+
+    $class->refresh_module($_) for $class->modified_modules;
+}
+
+sub modified_modules {
+    my $class = shift;
+
+    my @ret;
+    for my $file (keys %INC) {
+        if (exists $CACHE{$file}) {
+            push @ret, $file
+                if $class->_mtime($file) ne $CACHE{$file};
+        }
+        else {
+            $class->_update_cache_for($file);
+        }
+    }
+
+    return @ret;
+}
+
+sub refresh_module {
+    my $class = shift;
+    my ($mod) = @_;
+    $mod = $class->_file_to_mod($mod);
+
+    my @to_refresh = $class->_dependent_modules($mod);
+
+    $class->unload_module($_) for @to_refresh;
+    $class->load_module($_) for @to_refresh;
+}
+
+sub unload_module {
+    my $class = shift;
+    my ($mod) = @_;
+    $mod = $class->_file_to_mod($mod);
+
+    Class::Unload->unload($mod);
+
+    if (Class::Load::is_class_loaded('Class::MOP')) {
+        Class::MOP::remove_metaclass_by_name($mod);
+    }
+
+    $class->_clear_cache_for($mod);
+}
+
+sub load_module {
+    my $class = shift;
+    my ($mod) = @_;
+    $mod = $class->_file_to_mod($mod);
+
+    Class::Load::load_class($mod);
+
+    $class->_update_cache_for($mod);
+}
+
+sub _dependent_modules {
+    my $class = shift;
+    my ($mod) = @_;
+    $mod = $class->_file_to_mod($mod);
+
+    return ($mod) unless Class::Load::is_class_loaded('Class::MOP');
+
+    my $meta = Class::MOP::class_of($mod);
+
+    if ($meta->isa('Class::MOP::Class')) {
+        # attribute cloning (has '+foo') means that we can't skip refreshing
+        # mutable classes
+        return (
+            # NOTE: this order is important!
+            $mod,
+            map { $class->_dependent_modules($_) }
+                ($meta->subclasses,
+                 # XXX: metacircularity? what if $class is Class::MOP::Class?
+                 ($mod->isa('Class::MOP::Class')
+                     ? (map { $_->name }
+                            grep { $_->isa($class) }
+                                 Class::MOP::get_all_metaclass_instances())
+                     : ())),
+        );
+    }
+    elsif ($meta->isa('Moose::Meta::Role')) {
+        return (
+            $mod,
+            map { $class->_dependent_modules($_) } $meta->consumers,
+        );
+    }
+    else {
+        die "Unknown metaclass: $meta";
+    }
+}
+
+sub _update_cache_for {
+    my $class = shift;
+    my ($file) = @_;
+    $file = $class->_mod_to_file($file);
+
+    $CACHE{$file} = $class->_mtime($file);
+}
+
+sub _clear_cache_for {
+    my $class = shift;
+    my ($file) = @_;
+    $file = $class->_mod_to_file($file);
+
+    delete $CACHE{$file};
+}
+
+sub _mtime {
+    my $class = shift;
+    my ($file) = @_;
+    $file = $class->_mod_to_file($file);
+
+    return join ' ', (stat($INC{$file}))[1, 7, 9];
+}
+
+sub _file_to_mod {
+    my $class = shift;
+    my ($file) = @_;
+
+    return $file unless $file =~ /\.pm$/;
+
+    my $mod = $file;
+    $mod =~ s{\.pm$}{};
+    $mod =~ s{/}{::}g;
+
+    return $mod;
+}
+
+sub _mod_to_file {
+    my $class = shift;
+    my ($mod) = @_;
+
+    return $mod if $mod =~ /\.p[lm]$/;
+
+    my $file = $mod;
+    $file =~ s{::}{/}g;
+    $file .= '.pm';
+
+    return $file;
+}
+
+1;
-- 
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