Fix for single line file modification

When a file contains a single line of text, svn diff will generate an odd hunk
header. Modify the hunk parsing code to accept this format.

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/9147056

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@117143 0039d316-1c4b-4281-b951-d872f2087c98

patch.py

@@ -219,19 +219,24 @@ class FilePatchDiff(FilePatchBase):
     hunks = []
     for line in self.diff_hunks.splitlines(True):
       if line.startswith('@@'):
-        match = re.match(r'^@@ -(\d+),(\d+) \+([\d,]+) @@.*$', line)
+        match = re.match(r'^@@ -([\d,]+) \+([\d,]+) @@.*$', line)
         # File add will result in "-0,0 +1" but file deletion will result in
         # "-1,N +0,0" where N is the number of lines deleted. That's from diff
         # and svn diff. git diff doesn't exhibit this behavior.
+        # svn diff for a single line file rewrite "@@ -1 +1 @@". Fun.
         if not match:
           self._fail('Hunk header is unparsable')
-        if ',' in match.group(3):
+        if ',' in match.group(1):
-          start_dst, lines_dst = map(int, match.group(3).split(',', 1))
+          start_src, lines_src = map(int, match.group(1).split(',', 1))
         else:
-          start_dst = int(match.group(3))
+          start_src = int(match.group(1))
+          lines_src = 0
+        if ',' in match.group(2):
+          start_dst, lines_dst = map(int, match.group(2).split(',', 1))
+        else:
+          start_dst = int(match.group(2))
           lines_dst = 0
-        new_hunk = Hunk(int(match.group(1)), int(match.group(2)),
+        new_hunk = Hunk(start_src, lines_src, start_dst, lines_dst)
-                        start_dst, lines_dst)
         if hunks:
           if new_hunk.start_src <= hunks[-1].start_src:
             self._fail('Hunks source lines are not ordered')

testing_support/patches_data.py

@@ -112,6 +112,17 @@ class RAW(object):
       '       <!-- Browser Hung Plugin Detector -->\n'
       '       <message name="IDS_UNKNOWN_PLUGIN_NAME" ...\n')
 
+  # http://codereview.chromium.org/download/issue9091003_9005_8009.diff
+  DIFFERENT = (
+      'Index: master/unittests/data/processes-summary.dat\n'
+      '===================================================================\n'
+      '--- master/unittests/data/processes-summary.dat\t(revision 116240)\n'
+      '+++ master/unittests/data/processes-summary.dat\t(working copy)\n'
+      '@@ -1 +1 @@\n'
+      '-{"traces": {"1t_proc": ["2.0", "0.0"], "1t_proc_ref": ["1.0", ...\n'
+      '+{"traces": {"1t_proc": ["2.0", "0.0"], "1t_proc_ref": ["1.0", ...\n')
+
+
 class GIT(object):
   """Sample patches generated by git diff."""
   PATCH = (

tests/patch_test.py

@@ -71,6 +71,11 @@ class PatchTest(unittest.TestCase):
     p = patch.FilePatchDiff('chrome/file.cc', RAW.PATCH, [])
     self._check_patch(p, 'chrome/file.cc', RAW.PATCH, nb_hunks=1)
 
+  def testDifferent(self):
+    name = 'master/unittests/data/processes-summary.dat'
+    p = patch.FilePatchDiff(name, RAW.DIFFERENT, [])
+    self._check_patch(p, name, RAW.DIFFERENT, nb_hunks=1)
+
   def testFilePatchDiffHeaderMode(self):
     p = patch.FilePatchDiff('git_cl/git-cl', GIT.MODE_EXE, [])
     self._check_patch(