From 24319226191a65c99c0ba45a6f8d4deb047b5888 Mon Sep 17 00:00:00 2001
From: Felix Yan <felixonmars@archlinux.org>
Date: Wed, 4 Nov 2015 18:15:40 +0800
Subject: [PATCH] Add support for CPAN

---
 README.rst               |  7 +++++++
 nvchecker/get_version.py |  1 +
 nvchecker/source/cpan.py | 18 ++++++++++++++++++
 3 files changed, 26 insertions(+)
 create mode 100644 nvchecker/source/cpan.py

diff --git a/README.rst b/README.rst
index d2063f8..a22262c 100644
--- a/README.rst
+++ b/README.rst
@@ -159,6 +159,13 @@ Check `RubyGems <https://rubygems.org/>`_ for updates.
 gems
   The name used on RubyGems, e.g. ``sass``.
 
+Check CPAN
+--------------
+Check `MetaCPAN <https://metacpan.org/>`_ for updates.
+
+cpan
+  The name used on CPAN, e.g. ``YAML``.
+
 Check Local Pacman Database
 ---------------------------
 This is used when you run ``nvchecker`` on an Arch Linux system and the program always keeps up with a package in your configured repositories for `Pacman`_.
diff --git a/nvchecker/get_version.py b/nvchecker/get_version.py
index 472d93f..d1f96fb 100644
--- a/nvchecker/get_version.py
+++ b/nvchecker/get_version.py
@@ -5,6 +5,7 @@ logger = logging.getLogger(__name__)
 handler_precedence = (
   'github', 'gitcafe', 'aur', 'pypi', 'archpkg', 'gems', 'pacman',
   'cmd', 'bitbucket', 'gcode_hg', 'gcode_svn', 'regex', 'manual', 'vcs',
+  'cpan',
 )
 
 def get_version(name, conf, callback):
diff --git a/nvchecker/source/cpan.py b/nvchecker/source/cpan.py
new file mode 100644
index 0000000..dd999f2
--- /dev/null
+++ b/nvchecker/source/cpan.py
@@ -0,0 +1,18 @@
+import json
+from functools import partial
+
+from tornado.httpclient import AsyncHTTPClient
+
+# Using metacpan
+CPAN_URL = 'https://api.metacpan.org/release/%s'
+
+def get_version(name, conf, callback):
+  repo = conf.get('cpan') or name
+  url = CPAN_URL % repo
+  AsyncHTTPClient().fetch(url, user_agent='lilydjwg/nvchecker',
+                          callback=partial(_cpan_done, name, callback))
+
+def _cpan_done(name, callback, res):
+  data = json.loads(res.body.decode('utf-8'))
+  version = data['version']
+  callback(name, version)