#!/usr/bin/python -u
#####################################################################
#      diff2html      <http://www.roble.com/docs/diff2html.txt> 
# License terms at: <http://www.roble.com/docs/RobleBSDlicense.html>
#####################################################################

import string, sys

diffstart = """
<STYLE><!--
TABLE { border-collapse: collapse; border-spacing: 0px; }
TD.context { background-color: #FFFFFF; }
TD.meta { background-color: #FFFFE1; }
TD.added { background-color: #BEBEED; }
TD.removed { background-color: #EDBEBE; }
TD.changed { background-color: #BEEDBE; }
--></STYLE><table width="100%">
"""

diffend = """
</table>
"""

def printusage() :
  print """
diff2html - Formats {rcs,cvs,}diff output into HTML
Example: rcsdiff -e -rV1 -rV2 -u RCS/file,v | diff2html
"""

def sanitizeHTMLline(line):
  # assume input is already wrapped in <pre></pre> tags
  #for line in data.splitlines():
  if line and line != '':
    line = line.replace('&', '&amp;')
    line = line.replace('\t', '&nbsp;&nbsp;&nbsp;&nbsp;')
    line = line.replace('>', '&gt;')
    line = line.replace('<', '&lt;')
    line = line.replace('"', '&quot;')
    line = line.replace('\'', '&#96;')
    line = line.replace('`', '&#145;')
    line = line.replace('javascript:', 'java&#115;cript:')
    line = line.replace('onclick', 'on&#99;lick')
  return( line ) 


if ( __name__ == "__main__" ) :
  if (len(sys.argv) > 1):
    printusage()
    sys.exit()
  tdclass = ""
  print(diffstart)
  for line in sys.stdin.readlines():
    if line.startswith('-'):
      tdclass = 'removed'
    elif line.startswith('+'):
      tdclass = 'added'
    elif line[:1].isalnum() or line.startswith('@'):
      tdclass = 'meta'
    else:
      tdclass = 'context'
    print('<tr><td class="' + tdclass + '">' + sanitizeHTMLline(line) + '</td></tr>')
  print(diffend)