Use setuptools_scm to automatically version the package on tags

Author: nicoddemus

.gitignore

@@ -56,3 +56,6 @@ docs/_build/
 # PyBuilder
 target/
 *.swp
+
+# generated by setuptools_scm
+pluggy/_version.py

pluggy/__init__.py

@@ -1,4 +1,9 @@
-__version__ = '0.6.1.dev'
+try:
+    from ._version import version as __version__
+except ImportError:
+    # broken installation, we don't even try
+    # unknown only works because we do poor mans version compare
+    __version__ = 'unknown'
 
 __all__ = ["PluginManager", "PluginValidationError", "HookCallError",
            "HookspecMarker", "HookimplMarker"]

setup.py

@@ -1,4 +1,3 @@
-import os
 from setuptools import setup
 
 classifiers = [
@@ -20,22 +19,15 @@
     long_description = fd.read()
 
 
-def get_version():
-    p = os.path.join(os.path.dirname(
-                     os.path.abspath(__file__)), "pluggy/__init__.py")
-    with open(p) as f:
-        for line in f.readlines():
-            if "__version__" in line:
-                return line.strip().split("=")[-1].strip(" '")
-    raise ValueError("could not read version")
-
-
 def main():
     setup(
         name='pluggy',
         description='plugin and hook calling mechanisms for python',
         long_description=long_description,
-        version=get_version(),
+        use_scm_version={
+            'write_to': 'pluggy/_version.py',
+        },
+        setup_requires=['setuptools-scm'],
         license='MIT license',
         platforms=['unix', 'linux', 'osx', 'win32'],
         author='Holger Krekel',