Reviewers: Jakob,

Message:
PTAL

Description:
Refactor ChangeLog generation for push-to-trunk script.

This extracts the Git-independent part of the change log body generation. This
CL intends no change in behavior.

Please review this at https://codereview.chromium.org/61263011/

SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+40, -27 lines):
  M tools/push-to-trunk/common_includes.py
  M tools/push-to-trunk/push_to_trunk.py


Index: tools/push-to-trunk/common_includes.py
diff --git a/tools/push-to-trunk/common_includes.py b/tools/push-to-trunk/common_includes.py index eb2bfb07b3549838395dbc363b62d52db9383656..669aa6be1f4362d8113b73af86e8057d8f6cb134 100644
--- a/tools/push-to-trunk/common_includes.py
+++ b/tools/push-to-trunk/common_includes.py
@@ -75,6 +75,34 @@ def GetLastChangeLogEntries(change_log_file):
   return "".join(result)


+def MakeChangeLogBody(commit_generator):
+  result = ""
+  for (title, body, author) in commit_generator():
+    # Add the commit's title line.
+    result += "%s\n" % title.rstrip()
+
+    # Grep for "BUG=xxxx" lines in the commit message and convert them to
+    # "(issue xxxx)".
+    out = body.splitlines()
+    out = filter(lambda x: re.search(r"^BUG=", x), out)
+    out = filter(lambda x: not re.search(r"BUG=$", x), out)
+    out = filter(lambda x: not re.search(r"BUG=none$", x), out)
+
+    # TODO(machenbach): Handle multiple entries (e.g. BUG=123, 234).
+    def FormatIssue(text):
+      text = re.sub(r"BUG=v8:(.*)$", r"(issue \1)", text)
+      text = re.sub(r"BUG=chromium:(.*)$", r"(Chromium issue \1)", text)
+      text = re.sub(r"BUG=(.*)$", r"(Chromium issue \1)", text)
+      return "        %s\n" % text
+
+    for line in map(FormatIssue, out):
+      result += line
+
+    # Append the commit's author for reference.
+    result += "%s\n\n" % author.rstrip()
+  return result
+
+
# Some commands don't like the pipe, e.g. calling vi from within the script or
 # from subscripts like git cl upload.
 def Command(cmd, args="", prefix="", pipe=True):
Index: tools/push-to-trunk/push_to_trunk.py
diff --git a/tools/push-to-trunk/push_to_trunk.py b/tools/push-to-trunk/push_to_trunk.py index 669ba52f3ecfc95e2348b1346b35966bc24be9f3..04e992d72561d3bda315f9ec7cfc161f5b0fa25d 100755
--- a/tools/push-to-trunk/push_to_trunk.py
+++ b/tools/push-to-trunk/push_to_trunk.py
@@ -110,37 +110,22 @@ class PrepareChangeLog(Step):

     args = "log %s..HEAD --format=%%H" % self._state["last_push"]
     commits = self.Git(args).strip()
-    for commit in commits.splitlines():
-      # Get the commit's title line.
-      args = "log -1 %s --format=\"%%w(80,8,8)%%s\"" % commit
-      title = "%s\n" % self.Git(args).rstrip()
-      AppendToFile(title, self.Config(CHANGELOG_ENTRY_FILE))
-
-      # Grep for "BUG=xxxx" lines in the commit message and convert them to
-      # "(issue xxxx)".
-      out = self.Git("log -1 %s --format=\"%%B\"" % commit).splitlines()
-      out = filter(lambda x: re.search(r"^BUG=", x), out)
-      out = filter(lambda x: not re.search(r"BUG=$", x), out)
-      out = filter(lambda x: not re.search(r"BUG=none$", x), out)
-
-      # TODO(machenbach): Handle multiple entries (e.g. BUG=123, 234).
-      def FormatIssue(text):
-        text = re.sub(r"BUG=v8:(.*)$", r"(issue \1)", text)
-        text = re.sub(r"BUG=chromium:(.*)$", r"(Chromium issue \1)", text)
-        text = re.sub(r"BUG=(.*)$", r"(Chromium issue \1)", text)
-        return "        %s\n" % text
-
-      for line in map(FormatIssue, out):
-        AppendToFile(line, self.Config(CHANGELOG_ENTRY_FILE))
-
-      # Append the commit's author for reference.
-      args = "log -1 %s --format=\"%%w(80,8,8)(%%an)\"" % commit
-      author = self.Git(args).rstrip()
-      AppendToFile("%s\n\n" % author, self.Config(CHANGELOG_ENTRY_FILE))
+
+    def GetCommitMessages():
+      for commit in commits.splitlines():
+        yield [
+          self.Git("log -1 %s --format=\"%%w(80,8,8)%%s\"" % commit),
+          self.Git("log -1 %s --format=\"%%B\"" % commit),
+          self.Git("log -1 %s --format=\"%%w(80,8,8)(%%an)\"" % commit),
+        ]
+
+    body = MakeChangeLogBody(GetCommitMessages)
+    AppendToFile(body, self.Config(CHANGELOG_ENTRY_FILE))

msg = " Performance and stability improvements on all platforms.\n"
     AppendToFile(msg, self.Config(CHANGELOG_ENTRY_FILE))

+
 class EditChangeLog(Step):
   def __init__(self):
     Step.__init__(self, "Edit ChangeLog entry.")


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