Fixed installation issues

MANIFEST.in

@@ -1,4 +1,4 @@
 include requirements.txt
 include test-requirements.txt
 include README.md
-include balkian-pre-commit/VERSION
+include balkian_pre_commit/VERSION

balkian_pre_commit/__init__.py

@@ -18,9 +18,10 @@ pro-commit hooks for various projects
 """
 
 from __future__ import print_function
-import semver
 from .version import __version__
 
+try:
+    import semver
     __version_info__ = semver.parse_version_info(__version__)
 
     if __version_info__.prerelease:
@@ -33,3 +34,5 @@ if __version_info__.prerelease:
         else:
             import sys
             print(msg, file=sys.stderr)
+except ImportError:
+    print('semver not installed, not doing version checking')

balkian_pre_commit/branchversion.py

@@ -8,12 +8,15 @@ def main(argv=None):
     parser.add_argument('filenames', nargs='*')
     args = parser.parse_args(argv)
     branch_name = check_output(['git', 'rev-parse', '--abbrev-ref', 'HEAD']).strip().decode()
-    if branch_name == 'master':
     for fn in args.filenames:
         if os.path.basename(fn) == 'VERSION':
             with open(fn) as f:
-                    version = semver.parse_version_info(f.read())
-                    if version.prerelease:
+                currentcontent = f.read().strip()
+                prevcontent = check_output(['git', 'show', 'HEAD:{}'.format(fn)]).strip().decode()
+                current = semver.parse_version_info(currentcontent)
+                print('Checking versions: {} -> {}'.format(prevcontent, currentcontent))
+                if (branch_name == 'master' and current.prerelease) or\
+                   (semver.compare(currentcontent, prevcontent)<1):
                     return 1
     return 0
 

hooks.yaml

@@ -3,4 +3,4 @@
   description: This hook avoids commiting a pre-release to a master branch.
   entry: branchversion
   language: python
-  files: VERSION$
+  files: "VERSION$"