#! /usr/bin/env python

# xxci
#
# check in files for which rcsdiff returns nonzero exit status

import sys
import os
from stat import *
import commands
import fnmatch

EXECMAGIC = '\001\140\000\010'

MAXSIZE = 200*1024 # Files this big must be binaries and are skipped.

def getargs():
   args = sys.argv[1:]
   if args:
       return args
   print 'No arguments, checking almost *, in "ls -t" order'
   list = []
   for file in os.listdir(os.curdir):
       if not skipfile(file):
           list.append((getmtime(file), file))
   list.sort()
   if not list:
       print 'Nothing to do -- exit 1'
       sys.exit(1)
   list.sort()
   list.reverse()
   for mtime, file in list: args.append(file)
   return args

def getmtime(file):
   try:
       st = os.stat(file)
       return st[ST_MTIME]
   except os.error:
       return -1

badnames = ['tags', 'TAGS', 'xyzzy', 'nohup.out', 'core']
badprefixes = ['.', ',', '@', '#', 'o.']
badsuffixes = \
       ['~', '.a', '.o', '.old', '.bak', '.orig', '.new', '.prev', '.not', \
        '.pyc', '.fdc', '.rgb', '.elc', ',v']
ignore = []

def setup():
   ignore[:] = badnames
   for p in badprefixes:
       ignore.append(p + '*')
   for p in badsuffixes:
       ignore.append('*' + p)
   try:
       f = open('.xxcign', 'r')
   except IOError:
       return
   ignore[:] = ignore + f.read().split()

def skipfile(file):
   for p in ignore:
       if fnmatch.fnmatch(file, p): return 1
   try:
       st = os.lstat(file)
   except os.error:
       return 1 # Doesn't exist -- skip it
   # Skip non-plain files.
   if not S_ISREG(st[ST_MODE]): return 1
   # Skip huge files -- probably binaries.
   if st[ST_SIZE] >= MAXSIZE: return 1
   # Skip executables
   try:
       data = open(file, 'r').read(len(EXECMAGIC))
       if data == EXECMAGIC: return 1
   except:
       pass
   return 0

def badprefix(file):
   for bad in badprefixes:
       if file[:len(bad)] == bad: return 1
   return 0

def badsuffix(file):
   for bad in badsuffixes:
       if file[-len(bad):] == bad: return 1
   return 0

def go(args):
   for file in args:
       print file + ':'
       if differing(file):
           showdiffs(file)
           if askyesno('Check in ' + file + ' ? '):
               sts = os.system('rcs -l ' + file) # ignored
               sts = os.system('ci -l ' + file)

def differing(file):
   cmd = 'co -p ' + file + ' 2>/dev/null | cmp -s - ' + file
   sts = os.system(cmd)
   return sts != 0

def showdiffs(file):
   cmd = 'rcsdiff ' + file + ' 2>&1 | ${PAGER-more}'
   sts = os.system(cmd)

def askyesno(prompt):
   s = raw_input(prompt)
   return s in ['y', 'yes']

if __name__ == '__main__':
   try:
       setup()
       go(getargs())
   except KeyboardInterrupt:
       print '[Intr]'