Add a repo branches subcommand to describe current branches

We now display a summary of the available topic branches in this
client, based upon a sorted union of all existing projects.

Bug: REPO-21
Signed-off-by: Shawn O. Pearce <sop@google.com>

project.py

@@ -306,6 +306,32 @@ class Project(object):
     """
     return self.config.GetBranch(name)
 
+  def GetBranches(self):
+    """Get all existing local branches.
+    """
+    current = self.CurrentBranch
+    all = self.bare_git.ListRefs()
+    heads = {}
+    pubd = {}
+
+    for name, id in all.iteritems():
+      if name.startswith(R_HEADS):
+        name = name[len(R_HEADS):]
+        b = self.GetBranch(name)
+        b.current = name == current
+        b.published = None
+        b.revision = id
+        heads[name] = b
+
+    for name, id in all.iteritems():
+      if name.startswith(R_PUB):
+        name = name[len(R_PUB):]
+        b = heads.get(name)
+        if b:
+          b.published = id
+
+    return heads
+
 
 ## Status Display ##
 

subcmds/branches.py

@@ -0,0 +1,150 @@
+#
+# Copyright (C) 2009 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+from color import Coloring
+from command import Command
+
+class BranchColoring(Coloring):
+  def __init__(self, config):
+    Coloring.__init__(self, config, 'branch')
+    self.current = self.printer('current', fg='green')
+    self.local   = self.printer('local')
+    self.notinproject = self.printer('notinproject', fg='red')
+
+class BranchInfo(object):
+  def __init__(self, name):
+    self.name = name
+    self.current = 0
+    self.published = 0
+    self.published_equal = 0
+    self.projects = []
+
+  def add(self, b):
+    if b.current:
+      self.current += 1
+    if b.published:
+      self.published += 1
+    if b.revision == b.published:
+      self.published_equal += 1
+    self.projects.append(b)
+
+  @property
+  def IsCurrent(self):
+    return self.current > 0
+
+  @property
+  def IsPublished(self):
+    return self.published > 0
+
+  @property
+  def IsPublishedEqual(self):
+    return self.published_equal == len(self.projects)
+
+
+class Branches(Command):
+  common = True
+  helpSummary = "View current topic branches"
+  helpUsage = """
+%prog [<project>...]
+
+Summarizes the currently available topic branches.
+"""
+
+  def _Options(self, p):
+    p.add_option('-a', '--all',
+                 dest='all', action='store_true',
+                 help='show all branches, not just the majority')
+
+  def Execute(self, opt, args):
+    projects = self.GetProjects(args)
+    out = BranchColoring(self.manifest.manifestProject.config)
+    all = {}
+    project_cnt = len(projects)
+
+    for project in projects:
+      for name, b in project.GetBranches().iteritems():
+        b.project = project
+        if name not in all:
+          all[name] = BranchInfo(name)
+        all[name].add(b)
+
+    names = all.keys()
+    names.sort()
+
+    if not opt.all and not args:
+      # No -a and no specific projects listed; try to filter the
+      # results down to only the majority of projects.
+      #
+      n = []
+      for name in names:
+        i = all[name]
+        if i.IsCurrent \
+        or 80 <= (100 * len(i.projects)) / project_cnt:
+          n.append(name)
+      names = n
+
+    width = 25
+    for name in names:
+      if width < len(name):
+        width = len(name)
+
+    for name in names:
+      i = all[name]
+      in_cnt = len(i.projects)
+
+      if i.IsCurrent:
+        current = '*'
+        hdr = out.current
+      else:
+        current = ' '
+        hdr = out.local
+
+      if i.IsPublishedEqual:
+        published = 'P'
+      elif i.IsPublished:
+        published = 'p'
+      else:
+        published = ' '
+
+      hdr('%c%c %-*s' % (current, published, width, name))
+      out.write(' |')
+
+      if in_cnt < project_cnt and (in_cnt == 1 or opt.all):
+        fmt = out.write
+        paths = []
+        if in_cnt < project_cnt - in_cnt: 
+          type = 'in'
+          for b in i.projects:
+            paths.append(b.project.relpath)
+        else:
+          fmt = out.notinproject
+          type = 'not in'
+          have = set()
+          for b in i.projects:
+            have.add(b.project)
+          for p in projects:
+            paths.append(p.relpath)
+
+        s = ' %s %s' % (type, ', '.join(paths))
+        if width + 7 + len(s) < 80:
+          fmt(s)
+        else:
+          out.nl()
+          fmt('    %s:' % type)
+          for p in paths:
+            out.nl()
+            fmt('      %s' % p)
+      out.nl()