1 files changed, 49 insertions, 0 deletions
diff --git a/lib/python2.7/site-packages/pip/operations/check.py b/lib/python2.7/site-packages/pip/operations/check.py
new file mode 100644
index 0000000..2cf67aa
--- /dev/null
+++ b/lib/python2.7/site-packages/pip/operations/check.py
@@ -0,0 +1,49 @@
+
+
+def check_requirements(installed_dists):
+    missing_reqs_dict = {}
+    incompatible_reqs_dict = {}
+
+    for dist in installed_dists:
+        key = '%s==%s' % (dist.project_name, dist.version)
+
+        missing_reqs = list(get_missing_reqs(dist, installed_dists))
+        if missing_reqs:
+            missing_reqs_dict[key] = missing_reqs
+
+        incompatible_reqs = list(get_incompatible_reqs(
+            dist, installed_dists))
+        if incompatible_reqs:
+            incompatible_reqs_dict[key] = incompatible_reqs
+
+    return (missing_reqs_dict, incompatible_reqs_dict)
+
+
+def get_missing_reqs(dist, installed_dists):
+    """Return all of the requirements of `dist` that aren't present in
+    `installed_dists`.
+
+    """
+    installed_names = set(d.project_name.lower() for d in installed_dists)
+    missing_requirements = set()
+
+    for requirement in dist.requires():
+        if requirement.project_name.lower() not in installed_names:
+            missing_requirements.add(requirement)
+            yield requirement
+
+
+def get_incompatible_reqs(dist, installed_dists):
+    """Return all of the requirements of `dist` that are present in
+    `installed_dists`, but have incompatible versions.
+
+    """
+    installed_dists_by_name = {}
+    for installed_dist in installed_dists:
+        installed_dists_by_name[installed_dist.project_name] = installed_dist
+
+    for requirement in dist.requires():
+        present_dist = installed_dists_by_name.get(requirement.project_name)
+
+        if present_dist and present_dist not in requirement:
+            yield (requirement, present_dist)