git-repo/subcmds/help.py

#
# Copyright (C) 2008 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 re
import sys
from formatter import AbstractFormatter, DumbWriter

from color import Coloring
from command import PagedCommand, MirrorSafeCommand

class Help(PagedCommand, MirrorSafeCommand):
  common = False
  helpSummary = "Display detailed help on a command"
  helpUsage = """
%prog [--all|command]
"""
  helpDescription = """
Displays detailed usage information about a command.
"""

  def _PrintAllCommands(self):
    print 'usage: repo COMMAND [ARGS]'
    print """
The complete list of recognized repo commands are:
"""
    commandNames = self.commands.keys()
    commandNames.sort()

    maxlen = 0
    for name in commandNames:
      maxlen = max(maxlen, len(name))
    fmt = '  %%-%ds  %%s' % maxlen

    for name in commandNames:
      command = self.commands[name]
      try:
        summary = command.helpSummary.strip()
      except AttributeError:
        summary = ''
      print fmt % (name, summary)
    print """
See 'repo help <command>' for more information on a specific command.
"""

  def _PrintCommonCommands(self):
    print 'usage: repo COMMAND [ARGS]'
    print """
The most commonly used repo commands are:
"""
    commandNames = [name 
                    for name in self.commands.keys()
                    if self.commands[name].common]
    commandNames.sort()

    maxlen = 0
    for name in commandNames:
      maxlen = max(maxlen, len(name))
    fmt = '  %%-%ds  %%s' % maxlen

    for name in commandNames:
      command = self.commands[name]
      try:
        summary = command.helpSummary.strip()
      except AttributeError:
        summary = ''
      print fmt % (name, summary)
    print """
See 'repo help <command>' for more information on a specific command.
See 'repo help --all' for a complete list of recognized commands.
"""

  def _PrintCommandHelp(self, cmd):
    class _Out(Coloring):
      def __init__(self, gc):
        Coloring.__init__(self, gc, 'help')
        self.heading = self.printer('heading', attr='bold')

        self.wrap = AbstractFormatter(DumbWriter())

      def _PrintSection(self, heading, bodyAttr):
        try:
          body = getattr(cmd, bodyAttr)
        except AttributeError:
          return

        self.nl()

        self.heading('%s', heading)
        self.nl()

        self.heading('%s', ''.ljust(len(heading), '-'))
        self.nl()

        me = 'repo %s' % cmd.NAME
        body = body.strip()
        body = body.replace('%prog', me)

        asciidoc_hdr = re.compile(r'^\n?([^\n]{1,})\n([=~-]{2,})$')
        for para in body.split("\n\n"):
          if para.startswith(' '):
            self.write('%s', para)
            self.nl()
            self.nl()
            continue

          m = asciidoc_hdr.match(para)
          if m:
            title = m.group(1)
            type = m.group(2)
            if type[0] in ('=', '-'):
              p = self.heading
            else:
              def _p(fmt, *args):
                self.write('  ')
                self.heading(fmt, *args)
              p = _p

            p('%s', title)
            self.nl()
            p('%s', ''.ljust(len(title),type[0]))
            self.nl()
            continue

          self.wrap.add_flowing_data(para)
          self.wrap.end_paragraph(1)
        self.wrap.end_paragraph(0)

    out = _Out(self.manifest.globalConfig)
    out._PrintSection('Summary', 'helpSummary')
    cmd.OptionParser.print_help()
    out._PrintSection('Description', 'helpDescription')

  def _Options(self, p):
    p.add_option('-a', '--all',
                 dest='show_all', action='store_true',
                 help='show the complete list of commands')

  def Execute(self, opt, args):
    if len(args) == 0:
      if opt.show_all:
        self._PrintAllCommands()
      else:
        self._PrintCommonCommands()

    elif len(args) == 1:
      name = args[0]

      try:
        cmd = self.commands[name]
      except KeyError:
        print >>sys.stderr, "repo: '%s' is not a repo command." % name
        sys.exit(1)

      self._PrintCommandHelp(cmd)

    else:
      self._PrintCommandHelp(self)