#!/usr/bin/python
" SVN hook that performs some validations against styleguide.  "

from stylecheck import *

def command_output(cmd):
  " Capture a command's standard output. "
  import subprocess
  return subprocess.Popen(
      cmd.split(), stdout=subprocess.PIPE).communicate()[0]

def files_changed(look_cmd):
  """ List the files added or updated by this transaction.

"svnlook changed" gives output like:
  U   trunk/file1.cpp
  A   trunk/file2.cpp
  """
  def filename(line):
      return line[4:]
  def added_or_updated(line):
      return line and line[0] in ("A", "U")
  return [
      filename(line)
      for line in command_output(look_cmd % "changed").split("\n")
      if added_or_updated(line)]

def file_contents(filename, look_cmd):
  " Return a file's contents for this transaction. "
  return command_output(
     "%s %s" % (look_cmd % "cat", filename))

#def file_invalid(filename, look_cmd):
#  " Return True if this version of the file contains anything not styleguidy. "
#  data = file_contents(filename, look_cmd)
#  return (re.search("[A-Za-z0-9]\(", data) != None) or \
#         (re.search(".{80}$", data, re.M) != None)
  

def doChecks(look_cmd):
  def is_ada_file(fname):
      import os
      return os.path.splitext(fname)[1] in [".adb",".ads"]
  
  Result = 0  
  
  files = [
      ff for ff in files_changed(look_cmd)
      if is_ada_file(ff)]
  
  for file in files:
      print "Checking " + file
      fileResult = doCheckFile(file_contents(file, look_cmd))
      if fileResult != True:
          sys.stderr.write(file + ": " + fileResult)
          Result = 1
  
  return Result 

def main():
  usage = """usage: %prog REPOS TXN

Run pre-commit options on a repository transaction."""
  from optparse import OptionParser
  parser = OptionParser(usage=usage)
  parser.add_option("-r", "--revision",
                    help="Test mode. TXN actually refers to a revision.",
                    action="store_true", default=False)
  errors = 0
  try:
      (opts, (repos, txn_or_rvn)) = parser.parse_args()
      look_opt = ("--transaction", "--revision")[opts.revision]
      look_cmd = "svnlook %s %s %s %s" % (
          "%s", repos, look_opt, txn_or_rvn)
      errors += doChecks(look_cmd)
  except:
      parser.print_help()
      errors += 1
  return errors

if __name__ == "__main__":
  import sys
  sys.exit(main())