Support setuptools_scm

Closes #68.

CHANGES.rst

@@ -7,6 +7,13 @@ Changelog
 
 - Drop Python 3.3 support.
 
+- Support packages using ``setuptools_scm``
+  (`#68 <https://github.com/mgedmin/check-manifest/issues/68>`__).
+
+  Note that ``setuptools_scm`` usually makes MANIFEST.in files obsolete.
+  Having one is helpful only if you intend to build an sdist and then use that
+  sdist to perform further builds, instead of building from a source checkout.
+
 
 0.36 (2017-11-21)
 -----------------

check_manifest.py

@@ -788,6 +788,14 @@ def is_package(source_tree='.'):
     return os.path.exists(os.path.join(source_tree, 'setup.py'))
 
 
+def extract_version_from_filename(filename):
+    """Extract version number from sdist filename."""
+    filename = os.path.splitext(os.path.basename(filename))[0]
+    if filename.endswith('.tar'):
+        filename = os.path.splitext(filename)[0]
+    return filename.partition('-')[2]
+
+
 def check_manifest(source_tree='.', create=False, update=False,
                    python=sys.executable):
     """Compare a generated source distribution with list of files in a VCS.
@@ -816,6 +824,7 @@ def check_manifest(source_tree='.', create=False, update=False,
             sdist_files = sorted(normalize_names(strip_sdist_extras(
                 strip_toplevel_name(get_archive_file_list(sdist_filename)))))
             info_continue(": %d files and directories" % len(sdist_files))
+            version = extract_version_from_filename(sdist_filename)
         existing_source_files = list(filter(os.path.exists, all_source_files))
         missing_source_files = sorted(set(all_source_files) - set(existing_source_files))
         if missing_source_files:
@@ -840,6 +849,7 @@ def check_manifest(source_tree='.', create=False, update=False,
             info_begin("building a clean sdist")
             with cd(tempsourcedir):
                 with mkdtemp('-sdist') as tempdir:
+                    os.environ['SETUPTOOLS_SCM_PRETEND_VERSION'] = version
                     run([python, 'setup.py', 'sdist', '-d', tempdir])
                     sdist_filename = get_one_file_in(tempdir)
                     info_continue(": %s" % os.path.basename(sdist_filename))

tests.py

@@ -449,6 +449,11 @@ def test_is_package(self):
             self.assertTrue(is_package('a'))
             self.assertFalse(is_package('b'))
 
+    def test_extract_version_from_filename(self):
+        from check_manifest import extract_version_from_filename as e
+        self.assertEqual(e('dist/foo_bar-1.2.3.dev4+g12345.zip'), '1.2.3.dev4+g12345')
+        self.assertEqual(e('dist/foo_bar-1.2.3.dev4+g12345.tar.gz'), '1.2.3.dev4+g12345')
+
     def test_glob_to_regexp(self):
         from check_manifest import _glob_to_regexp as g2r
         sep = os.path.sep.replace('\\', '\\\\')