VirtualEnv properties to the installation details report

apps/installation/classes.py

@@ -1,6 +1,25 @@
+from __future__ import absolute_import
+
+from collections import namedtuple
+import os
+import sys
+
+import pbs
+
+try:
+    from pbs import pip
+    PIP = True
+except pbs.CommandNotFound: 
+    PIP = False
+
+from django.conf import settings
 from django.utils.simplejson import dumps
 
 
+class PIPNotFound(Exception):
+    pass
+
+
 class PropertyNamespace(object):
     _registry = {}
 
@@ -73,3 +92,75 @@ class Property(object):
 
     def __str__(self):
         return str(self.value)
+
+
+Dependency = namedtuple('Dependency', 'name, version, standard')
+
+
+class VirtualEnv(object):
+    def extract_dependency(self, string):
+        string = str(string.strip())
+
+        try:
+            package, version = string.split('==')
+        except ValueError:
+            # item is not installed from package, svn/git maybe
+            try:
+                version, package = string.split('=')
+            except:
+                # has no version number
+                return Dependency(string, version=None, standard=True)
+            else:
+                version = version.split('#')[0].split(' ')[1]  # Get rid of '#egg' and '-e'
+                return Dependency(package, version, standard=False)
+        else:
+            return Dependency(package, version, standard=True)
+
+
+    def get_packages_info(self, requirements_file=None):
+        if requirements_file:
+            with open(requirements_file) as file_in:
+                for line in file_in.readlines():
+                    yield self.extract_dependency(line)
+        else:
+            for item in pip('freeze').splitlines():
+                yield self.extract_dependency(item)
+            
+
+    def __init__(self):
+        self.requirements_file_path = os.path.join(settings.PROJECT_ROOT, 'requirements', 'production.txt')
+        if not PIP:
+            raise PIPNotFound
+
+
+    def get_results(self):
+        requirements = {}
+        installed_packages = {}
+
+        for item in self.get_packages_info(self.requirements_file_path):
+            requirements[item.name] = item
+
+        for item in self.get_packages_info():
+            installed_packages[item.name] = item
+
+        for name, item in requirements.items():
+            try:
+                if item.standard:
+                    if item.version:
+                        if item.version == installed_packages[name].version:
+                            status = item.version
+                        else:
+                            status = installed_packages[name].version
+                    else:
+                        status = None
+                else:
+                    # Non standard version number, check SVN or GIT path
+                    if item.version == installed_packages['%s-dev' % name.replace('-', '_')].version:
+                        status = item.version
+                    else:
+                        status = installed_packages['%s-dev' % name.replace('-', '_')].version
+            except KeyError:
+                # Not installed package found matching with name matchin requirement
+                status = False
+            
+            yield name, item.version, status