implement optional '--all' in the abandon command

when you want to delete all local branches, you should be find
all branches' name, and type them behind 'repo abandon' command.

Usage:
    repo abandon --all [<project>...]

Change-Id: I4d391f37fb9d89b8095488c585468eafc1a35f31

subcmds/abandon.py

@@ -16,6 +16,7 @@
 from __future__ import print_function
 import sys
 from command import Command
+from collections import defaultdict
 from git_command import git
 from progress import Progress
 
@@ -23,48 +24,75 @@ class Abandon(Command):
   common = True
   helpSummary = "Permanently abandon a development branch"
   helpUsage = """
-%prog <branchname> [<project>...]
+%prog [--all | <branchname>] [<project>...]
 
 This subcommand permanently abandons a development branch by
 deleting it (and all its history) from your local repository.
 
 It is equivalent to "git branch -D <branchname>".
 """
+  def _Options(self, p):
+    p.add_option('--all',
+                 dest='all', action='store_true',
+                 help='delete all branches in all projects')
 
   def Execute(self, opt, args):
-    if not args:
+    if not opt.all and not args:
       self.Usage()
 
+    if not opt.all:
       nb = args[0]
       if not git.check_ref_format('heads/%s' % nb):
         print("error: '%s' is not a valid name" % nb, file=sys.stderr)
         sys.exit(1)
+    else:
+      args.insert(0,None)
+      nb = "'All local branches'"
 
-    err = []
-    success = []
+    err = defaultdict(list)
+    success = defaultdict(list)
     all_projects = self.GetProjects(args[1:])
 
     pm = Progress('Abandon %s' % nb, len(all_projects))
     for project in all_projects:
       pm.update()
 
-      status = project.AbandonBranch(nb)
+      if opt.all:
+        branches = project.GetBranches().keys()
+      else:
+        branches = [nb]
+
+      for name in branches:
+        status = project.AbandonBranch(name)
         if status is not None:
           if status:
-          success.append(project)
+            success[name].append(project)
           else:
-          err.append(project)
+            err[name].append(project)
     pm.end()
 
+    width = 25
+    for name in branches:
+      if width < len(name):
+        width = len(name)
+
     if err:
-      for p in err:
-        print("error: %s/: cannot abandon %s" % (p.relpath, nb),
-              file=sys.stderr)
+      for br in err.keys():
+        err_msg = "error: cannot abandon %s" %br
+        print(err_msg, file=sys.stderr)
+        for proj in err[br]:
+          print(' '*len(err_msg) + " | %s" % p.relpath, file=sys.stderr)
       sys.exit(1)
     elif not success:
-      print('error: no project has branch %s' % nb, file=sys.stderr)
+      print('error: no project has local branch(es) : %s' % nb,
+            file=sys.stderr)
       sys.exit(1)
     else:
-      print('Abandoned in %d project(s):\n  %s'
-            % (len(success), '\n  '.join(p.relpath for p in success)),
-            file=sys.stderr)
+      print('Abandoned branches:', file=sys.stderr)
+      for br in success.keys():
+        if len(all_projects) > 1 and len(all_projects) == len(success[br]):
+          result = "all project"
+        else:
+          result = "%s" % (
+            ('\n'+' '*width + '| ').join(p.relpath for p in success[br]))
+        print("%s%s| %s\n" % (br,' '*(width-len(br)), result),file=sys.stderr)