git_footers: fix bug stdin-based message input.

Also adds tests for the bug and for --json output.

R=agable@chromium.org, phajdan@chromium.org

Change-Id: I4e2208fdad8e23d48d27d0a354470336a7b86180
Reviewed-on: https://chromium-review.googlesource.com/570030
Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>

git_footers.py

@@ -192,8 +192,8 @@ def main(args):
   parser = argparse.ArgumentParser(
     formatter_class=argparse.ArgumentDefaultsHelpFormatter
   )
-  parser.add_argument('ref', nargs='?', help="Git ref to retrieve footers from."
+  parser.add_argument('ref', nargs='?', help='Git ref to retrieve footers from.'
-                      " Omit to parse stdin.")
+                      ' Omit to parse stdin.')
 
   g = parser.add_mutually_exclusive_group()
   g.add_argument('--key', metavar='KEY',
@@ -202,14 +202,14 @@ def main(args):
   g.add_argument('--position', action='store_true')
   g.add_argument('--position-ref', action='store_true')
   g.add_argument('--position-num', action='store_true')
-  g.add_argument('--json', help="filename to dump JSON serialized headers to.")
+  g.add_argument('--json', help='filename to dump JSON serialized footers to.')
 
   opts = parser.parse_args(args)
 
   if opts.ref:
     message = git.run('log', '-1', '--format=%B', opts.ref)
   else:
-    message = '\n'.join(l for l in sys.stdin)
+    message = sys.stdin.read()
 
   footers = parse_footers(message)
 

tests/git_footers_test.py

@@ -2,9 +2,11 @@
 
 """Tests for git_footers."""
 
+import json
 import os
 import StringIO
 import sys
+import tempfile
 import unittest
 
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
@@ -198,14 +200,22 @@ My commit message is my best friend. It is my life. I must master it.
 
   def testReadStdin(self):
     self.mock(git_footers.sys, 'stdin', StringIO.StringIO(
-        'line\r\notherline\r\n\r\n\r\nFoo: baz'))
+        'line\r\notherline\r\n\r\n\r\nFoo: baz\r\nStill: footer'))
 
     stdout = StringIO.StringIO()
     self.mock(git_footers.sys, 'stdout', stdout)
 
     self.assertEqual(git_footers.main([]), 0)
-    self.assertEqual(stdout.getvalue(), "Foo: baz\n")
+    self.assertEqual(stdout.getvalue(), 'Still: footer\nFoo: baz\n')
 
+  def testToJson(self):
+    self.mock(git_footers.sys, 'stdin', StringIO.StringIO(
+        'line\r\nany spaces\r\n\r\n\r\nFoo: 1\nBar: 2\nFoo: 3'))
+
+    with tempfile.NamedTemporaryFile() as tmp:
+      self.assertEqual(git_footers.main(['--json', tmp.name]), 0)
+      js = json.load(open(tmp.name))
+    self.assertEqual(js, {'Foo': ['3', '1'], 'Bar': ['2']})
 
 
 if __name__ == '__main__':