Add travis check

pint/__init__.py

@@ -82,6 +82,47 @@ def _run_pyroma(data):   # pragma: no cover
             sys.exit(1)
 
 
+def _check_travis(data):   # pragma: no cover
+    """Check if Travis reports that everything is ok.
+    (used to perform checks before releasing a new version).
+    """
+    import json
+    import sys
+
+    from zest.releaser.utils import system, ask
+    if not ask('Check with Travis before releasing?'):
+        return
+
+    try:
+        # Python 3
+        from urllib.request import urlopen
+        def get(url):
+            return urlopen(url).read().decode('utf-8')
+
+    except ImportError:
+        # Python 2
+        from urllib2 import urlopen
+        def get(url):
+            return urlopen(url).read()
+
+    url = 'https://api.github.com/repos/%s/%s/status/%s'
+
+    username = 'hgrecco'
+    repo = 'pint'
+    commit = system('git rev-parse HEAD')
+
+    try:
+        result = json.loads(get(url % (username, repo, commit)))['state']
+        print('Travis says: %s' % result)
+        if result != 'success':
+            if not ask('Do you want to continue anyway?'):
+                sys.exit(1)
+    except Exception:
+        print('Could not determine the commit state with Travis.')
+        if ask('Do you want to continue anyway?'):
+            sys.exit(1)
+
+
 def test():
     """Run all tests.
 

setup.py

@@ -48,6 +48,9 @@ setup(
          'zest.releaser.releaser.after_checkout': [
             'pyroma = pint:_run_pyroma',
          ],
+         'zest.releaser.prereleaser.before': [
+            'travis = pint:_check_travis',
+         ],
       },
     license='BSD',
     classifiers=[