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"""debug.py: various debugging tools for the rcsparse package."""

import time

from __init__ import parse
import common


class DebugSink(common.Sink):
  def set_head_revision(self, revision):
    print 'head:', revision

  def set_principal_branch(self, branch_name):
    print 'branch:', branch_name

  def define_tag(self, name, revision):
    print 'tag:', name, '=', revision

  def set_comment(self, comment):
    print 'comment:', comment

  def set_description(self, description):
    print 'description:', description

  def define_revision(self, revision, timestamp, author, state,
                      branches, next):
    print 'revision:', revision
    print '    timestamp:', timestamp
    print '    author:', author
    print '    state:', state
    print '    branches:', branches
    print '    next:', next

  def set_revision_info(self, revision, log, text):
    print 'revision:', revision
    print '    log:', log
    print '    text:', text[:100], '...'


class DumpSink(common.Sink):
  """Dump all the parse information directly to stdout.

  The output is relatively unformatted and untagged. It is intended as a
  raw dump of the data in the RCS file. A copy can be saved, then changes
  made to the parsing engine, then a comparison of the new output against
  the old output.
  """
  def __init__(self):
    global sha
    import sha

  def set_head_revision(self, revision):
    print revision

  def set_principal_branch(self, branch_name):
    print branch_name

  def define_tag(self, name, revision):
    print name, revision

  def set_comment(self, comment):
    print comment

  def set_description(self, description):
    print description

  def define_revision(self, revision, timestamp, author, state,
                      branches, next):
    print revision, timestamp, author, state, branches, next

  def set_revision_info(self, revision, log, text):
    print revision, sha.new(log).hexdigest(), sha.new(text).hexdigest()

  def tree_completed(self):
    print 'tree_completed'

  def parse_completed(self):
    print 'parse_completed'


def dump_file(fname):
  parse(open(fname, 'rb'), DumpSink())

def time_file(fname):
  f = open(fname, 'rb')
  s = common.Sink()
  t = time.time()
  parse(f, s)
  t = time.time() - t
  print t

def _usage():
  print 'This is normally a module for importing, but it has a couple'
  print 'features for testing as an executable script.'
  print 'USAGE: %s COMMAND filename,v' % sys.argv[0]
  print '  where COMMAND is one of:'
  print '    dump: filename is "dumped" to stdout'
  print '    time: filename is parsed with the time written to stdout'
  sys.exit(1)

if __name__ == '__main__':
  import sys
  if len(sys.argv) != 3:
    _usage()
  if sys.argv[1] == 'dump':
    dump_file(sys.argv[2])
  elif sys.argv[1] == 'time':
    time_file(sys.argv[2])
  else:
    _usage()