Merge pull request poise#94 from idio-cookbooks/version-detection

Fix version detection (setuptools and distribute)

Author: coderanger

providers/pip.rb

@@ -106,17 +106,13 @@ def load_current_resource
 
 defcurrent_installed_version
 @current_installed_version ||= begin
-delimeter=/==/
-
-normalized_package_name=new_resource.package_name.gsub('_','-')
-version_check_cmd="#{which_pip(new_resource)} freeze | grep -i '^#{normalized_package_name}=='"
-# incase you upgrade pip with pip!
-ifnew_resource.package_name.eql?('pip')
-delimeter=/\s/
-version_check_cmd="#{which_pip(@new_resource)} --version"
+out=nil
+package_name=new_resource.package_name.gsub('_','-')
+pattern=Regexp.new("^#{Regexp.escape(package_name)}\\(([^)]+)\\)$",true)
+shell_out("#{which_pip(new_resource)} list").stdout.lines.finddo |line|
+out=pattern.match(line)
 end
-result=shell_out(version_check_cmd)
-(result.exitstatus == 0) ? result.stdout.split(delimeter)[1].strip : nil
+out.nil? ? nil : out[1]
 end
 end