From 67caa3cab560fb58ef93e71c7562d89afd3b03f2 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sun, 21 Nov 2010 21:34:33 -0600
Subject: use dist-checkconflicts

---
 bin/package-stash-conflicts    | 19 ++++++++++++++++++
 dist.ini                       |  4 ++++
 inc/MMPackageStash.pm          | 44 ++++++++++++++++--------------------------
 lib/Package/Stash/Conflicts.pm | 14 ++++++++++++++
 4 files changed, 54 insertions(+), 27 deletions(-)
 create mode 100644 bin/package-stash-conflicts
 create mode 100644 lib/Package/Stash/Conflicts.pm

diff --git a/bin/package-stash-conflicts b/bin/package-stash-conflicts
new file mode 100644
index 0000000..3ebeb3a
--- /dev/null
+++ b/bin/package-stash-conflicts
@@ -0,0 +1,19 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+# PODNAME: package-stash-conflicts
+
+use Getopt::Long;
+use Package::Stash::Conflicts;
+
+my $verbose;
+GetOptions("verbose|v" => \$verbose);
+
+if ($verbose) {
+    Package::Stash::Conflicts->check_conflicts;
+}
+else {
+    my @conflicts = Package::Stash::Conflicts->calculate_conflicts;
+    print "$_\n" for map { $_->{package} } @conflicts;
+    exit @conflicts;
+}
diff --git a/dist.ini b/dist.ini
index 3a79421..5578e88 100644
--- a/dist.ini
+++ b/dist.ini
@@ -10,6 +10,7 @@ awesome = =inc::MMPackageStash
 
 [Prereqs]
 perl = 5.8.3
+Dist::CheckConflicts = 0
 Package::DeprecationManager = 0
 Package::Stash::XS = 0
 Scalar::Util = 0
@@ -21,3 +22,6 @@ Test::Requires = 0
 
 [Prereqs / TestRecommends]
 Test::LeakTrace = 0
+
+[Prereqs / ConfigureRequires]
+Dist::CheckConflicts = 0
diff --git a/inc/MMPackageStash.pm b/inc/MMPackageStash.pm
index b29aa5e..f90eb99 100644
--- a/inc/MMPackageStash.pm
+++ b/inc/MMPackageStash.pm
@@ -45,39 +45,29 @@ CAN_CC
     # copied out of moose
     my $check_conflicts = <<'CHECK_CONFLICTS';
 sub check_conflicts {
-    my %conflicts = (
-        'Class::MOP'                    => '1.08',
-        'MooseX::Role::WithOverloading' => '0.08',
-        'namespace::clean'              => '0.18',
-    );
-    my $found = 0;
-    for my $mod ( sort keys %conflicts ) {
-        eval "require $mod";
-        next if $@;
-
-        my $installed = $mod->VERSION();
-        if ( $installed le $conflicts{$mod} ) {
-
-            print <<"EOF";
-
+    if (eval { require 'lib/Package/Stash/Conflicts.pm'; 1; }) {
+        if (eval { Package::Stash::Conflicts->check_conflicts; 1 }) {
+            return;
+        }
+        else {
+            my $err = $@;
+            $err =~ s/^/    /mg;
+            warn "***\n$err***\n";
+        }
+    }
+    else {
+        print <<'EOF';
 ***
-    This version of Package::Stash conflicts with the version of
-    $mod ($installed) you have installed.
-
-    You will need to upgrade $mod after installing
-    this version of Package::Stash.
+    Your toolchain doesn't support configure_requires, so Dist::CheckConflicts
+    hasn't been installed yet. You should check for conflicting modules
+    manually using the 'package-stash-conflicts' script that is installed with
+    this distribution once the installation finishes.
 ***
-
 EOF
-
-            $found = 1;
-        }
     }
 
-    return unless $found;
-
     # More or less copied from Module::Build
-    return if  $ENV{PERL_MM_USE_DEFAULT};
+    return if $ENV{PERL_MM_USE_DEFAULT};
     return unless -t STDIN && (-t STDOUT || !(-f STDOUT || -c STDOUT));
 
     sleep 4;
diff --git a/lib/Package/Stash/Conflicts.pm b/lib/Package/Stash/Conflicts.pm
new file mode 100644
index 0000000..53e6680
--- /dev/null
+++ b/lib/Package/Stash/Conflicts.pm
@@ -0,0 +1,14 @@
+package # hide from PAUSE
+    Package::Stash::Conflicts;
+use strict;
+use warnings;
+
+use Dist::CheckConflicts
+    -dist => 'Package-Stash',
+    -conflicts => {
+        'Class::MOP'                    => '1.08',
+        'MooseX::Role::WithOverloading' => '0.08',
+        'namespace::clean'              => '0.18',
+    };
+
+1;
-- 
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