Refactoring: Redesign option parsing in push and merge scripts.

tools/push-to-trunk/push_to_trunk.py

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 0dc1a077d282cf4bfe24ac31192b8ceb94df3bde..ef04b33eeb8e771dd6f15b5af7c8f36bb51076ec 100755
--- a/tools/push-to-trunk/push_to_trunk.py
+++ b/tools/push-to-trunk/push_to_trunk.py
@@ -26,7 +26,7 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-import optparse
+import argparse
 import sys
 import tempfile
 import urllib2
@@ -55,35 +55,6 @@ PUSH_MESSAGE_SUFFIX = " (based on bleeding_edge revision r%d)"
 PUSH_MESSAGE_RE = re.compile(r".* \(based on bleeding_edge revision r(\d+)\)$")
 
 
-class PushToTrunkOptions(CommonOptions):
-  @staticmethod
-  def MakeForcedOptions(author, reviewer, chrome_path):
-    """Convenience wrapper."""
-    class Options(object):
-      pass
-    options = Options()
-    options.s = 0
-    options.l = None
-    options.b = None
-    options.f = True
-    options.m = False
-    options.c = chrome_path
-    options.reviewer = reviewer
-    options.a = author
-    return PushToTrunkOptions(options)
-
-  def __init__(self, options):
-    super(PushToTrunkOptions, self).__init__(options, options.m)
-    self.requires_editor = not options.f
-    self.wait_for_lgtm = not options.f
-    self.tbr_commit = not options.m
-    self.l = options.l
-    self.reviewer = options.reviewer
-    self.c = options.c
-    self.b = getattr(options, 'b', None)
-    self.author = getattr(options, 'a', None)
-
-
 class Preparation(Step):
   MESSAGE = "Preparation."
 
@@ -105,7 +76,7 @@ class DetectLastPush(Step):
   MESSAGE = "Detect commit ID of last push to trunk."
 
   def RunStep(self):
-    last_push = self._options.l or self.FindLastTrunkPush()
+    last_push = self._options.last_push or self.FindLastTrunkPush()
     while True:
       # Print assumed commit, circumventing git's pager.
       print self.GitLog(n=1, git_hash=last_push)
@@ -113,10 +84,10 @@ class DetectLastPush(Step):
         break
       last_push = self.FindLastTrunkPush(parent_hash=last_push)
 
-    if self._options.b:
+    if self._options.last_bleeding_edge:
       # Read the bleeding edge revision of the last push from a command-line
       # option.
-      last_push_bleeding_edge = self._options.b
+      last_push_bleeding_edge = self._options.last_bleeding_edge
     else:
       # Retrieve the bleeding edge revision of the last push from the text in
       # the push commit message.
@@ -415,7 +386,7 @@ class CheckChromium(Step):
   MESSAGE = "Ask for chromium checkout."
 
   def Run(self):
-    self["chrome_path"] = self._options.c
+    self["chrome_path"] = self._options.chromium
     if not self["chrome_path"]:
       self.DieNoManualMode("Please specify the path to a Chromium checkout in "
                           "forced mode.")
@@ -511,94 +482,69 @@ class CleanUp(Step):
       self.GitDeleteBranch(self.Config(TRUNKBRANCH))
 
 
-def RunPushToTrunk(config,
-                   options,
-                   side_effect_handler=DEFAULT_SIDE_EFFECT_HANDLER):
-  step_classes = [
-    Preparation,
-    FreshBranch,
-    DetectLastPush,
-    PrepareChangeLog,
-    EditChangeLog,
-    IncrementVersion,
-    CommitLocal,
-    UploadStep,
-    CommitRepository,
-    StragglerCommits,
-    SquashCommits,
-    NewBranch,
-    ApplyChanges,
-    SetVersion,
-    CommitTrunk,
-    SanityCheck,
-    CommitSVN,
-    TagRevision,
-    CheckChromium,
-    SwitchChromium,
-    UpdateChromiumCheckout,
-    UploadCL,
-    SwitchV8,
-    CleanUp,
-  ]
-
-  RunScript(step_classes, config, options, side_effect_handler)
-
-
-def BuildOptions():
-  result = optparse.OptionParser()
-  result.add_option("-a", "--author", dest="a",
-                    help=("Specify the author email used for rietveld."))
-  result.add_option("-b", "--last-bleeding-edge", dest="b",
-                    help=("Manually specify the git commit ID of the last "
-                          "bleeding edge revision that was pushed to trunk. "
-                          "This is used for the auto-generated ChangeLog "
-                          "entry."))
-  result.add_option("-c", "--chromium", dest="c",
-                    help=("Specify the path to your Chromium src/ "
-                          "directory to automate the V8 roll."))
-  result.add_option("-f", "--force", dest="f",
-                    help="Don't prompt the user.",
-                    default=False, action="store_true")
-  result.add_option("-l", "--last-push", dest="l",
-                    help=("Manually specify the git commit ID "
-                          "of the last push to trunk."))
-  result.add_option("-m", "--manual", dest="m",
-                    help="Prompt the user at every important step.",
-                    default=False, action="store_true")
-  result.add_option("-r", "--reviewer",
-                    help=("Specify the account name to be used for reviews."))
-  result.add_option("-s", "--step", dest="s",
-                    help="Specify the step where to start work. Default: 0.",
-                    default=0, type="int")
-  return result
-
-
-def ProcessOptions(options):
-  if options.s < 0:
-    print "Bad step number %d" % options.s
-    return False
-  if not options.m and not options.reviewer:
-    print "A reviewer (-r) is required in (semi-)automatic mode."
-    return False
-  if options.f and options.m:
-    print "Manual and forced mode cannot be combined."
-    return False
-  if not options.m and not options.c:
-    print "A chromium checkout (-c) is required in (semi-)automatic mode."
-    return False
-  if not options.m and not options.a:
-    print "Specify your chromium.org email with -a in (semi-)automatic mode."
-    return False
-  return True
-
-
-def Main():
-  parser = BuildOptions()
-  (options, args) = parser.parse_args()
-  if not ProcessOptions(options):
-    parser.print_help()
-    return 1
-  RunPushToTrunk(CONFIG, PushToTrunkOptions(options))
+class PushToTrunk(ScriptsBase):
+  def _PrepareOptions(self, parser):
+    group = parser.add_mutually_exclusive_group()
+    group.add_argument("-f", "--force",
+                      help="Don't prompt the user.",
+                      default=False, action="store_true")
+    group.add_argument("-m", "--manual",
+                      help="Prompt the user at every important step.",
+                      default=False, action="store_true")
+    parser.add_argument("-b", "--last-bleeding-edge",
+                        help=("The git commit ID of the last bleeding edge "
+                              "revision that was pushed to trunk. This is "
+                              "used for the auto-generated ChangeLog entry."))
+    parser.add_argument("-c", "--chromium",
+                        help=("The path to your Chromium src/ "
+                              "directory to automate the V8 roll."))
+    parser.add_argument("-l", "--last-push",
+                        help="The git commit ID of the last push to trunk.")
+
+  def _ProcessOptions(self, options):
+    if not options.manual and not options.reviewer:
+      print "A reviewer (-r) is required in (semi-)automatic mode."
+      return False
+    if not options.manual and not options.chromium:
+      print "A chromium checkout (-c) is required in (semi-)automatic mode."
+      return False
+    if not options.manual and not options.author:
+      print "Specify your chromium.org email with -a in (semi-)automatic mode."
+      return False
+
+    options.requires_editor = not options.force
+    options.wait_for_lgtm = not options.force
+    options.tbr_commit = not options.manual
+    return True
+
+  def _Steps(self):
+    return [
+      Preparation,
+      FreshBranch,
+      DetectLastPush,
+      PrepareChangeLog,
+      EditChangeLog,
+      IncrementVersion,
+      CommitLocal,
+      UploadStep,
+      CommitRepository,
+      StragglerCommits,
+      SquashCommits,
+      NewBranch,
+      ApplyChanges,
+      SetVersion,
+      CommitTrunk,
+      SanityCheck,
+      CommitSVN,
+      TagRevision,
+      CheckChromium,
+      SwitchChromium,
+      UpdateChromiumCheckout,
+      UploadCL,
+      SwitchV8,
+      CleanUp,
+    ]
+
 
 if __name__ == "__main__":
-  sys.exit(Main())
+  sys.exit(PushToTrunk(CONFIG).Run())