#!/usr/bin/python

#
# Used to extract the revision number of a file by processing the output of the svn info command
# This script is meant to be called from other python scripts
#
# Example usage:
#
#       ./GetSvnRevision.py <filename>
#       return the revision number

import sys, os, subprocess

def get_svn_revision(file_name):
    # run the svn command
    svnVersion = subprocess.check_output(['svn', 'info', file_name], shell=False)
    # Look for the string Last Changed Rev:
    position = svnVersion.find('Last Changed Rev: ');
    if position != -1:
        # get the number string between position + len(Last Changed Rev: )
        # and the next return character
        position += len('Last Changed Rev: ')
        endOfLinePos = svnVersion.find('\r', position)
        if endOfLinePos != -1:
            # extract the string and return it
            revNumber = svnVersion[position:endOfLinePos]
            return int(revNumber)
        else:
            endOfLinePos = svnVersion.find('\n', position)
            if endOfLinePos != -1:
                # extract the string and return it
                revNumber = svnVersion[position:endOfLinePos]
                return int(revNumber)
    return -1

if __name__ == "__main__":
    testVal = get_svn_revision(sys.argv[1])
    print testVal