#!/usr/bin/env python

import sys
import os
import re
import commands
from os.path import join, getsize
from optparse import OptionParser


def getFilesRevs(listPaths):
    """ Get a list of tuples (file, revNumber) for the list of paths passed as parameter """
    listPaths = map( (lambda s: s[-1]!='/' and str(s) +'/' or s) , listPaths)
    
    filePattern = re.compile(r"^(.*\.(css|js))$", re.IGNORECASE)
    revPattern = re.compile(r"\d+", re.IGNORECASE)
    listFilesRevs = []
    for path in listPaths:
        for root, dirs, files in os.walk(path):
            files = filter(filePattern.search, files)
            for name in files:
                revStr = commands.getoutput('svn info ' + root + name +' | grep "Last Changed Rev" -i')
                revStr = revPattern.findall(revStr)
                if len(revStr):
                    # Please notice this is getting the path from specified in the parameters to
                    # a path that the webserver will understand.
                    # In my case "../js/" is the real path and "/js/" the path for the webserver
                    # Tweak this to fit your paths for the static files
                    listFilesRevs.append( (root[root[:-1].find('/'):] + name , revStr[0]) )
    
            if '.svn' in dirs:
                dirs.remove('.svn')  # don't visit SVN directories
                
    return listFilesRevs


def printPHP(listFilesRevs, pipeName):
    """ Generates PHP code for the list of tuples (file, revNumber) and outputs it in pipeName paramter """

    
    print >> pipeName, "<?php "
    print >> pipeName, ""
    print >> pipeName, "//$productionSite - if set and true, append versions to static files in template 'top.tpl'"
    print >> pipeName, "$productionSite = true;"
    print >> pipeName, ""
    print >> pipeName, "//array with filenames (as used in template 'top.tpl') and file SVN last revision"
    print >> pipeName, "$staticFilesVersions = array("
    
    for fileRev in listFilesRevs:
        print >> pipeName, "    '" + fileRev[0] + "' => '" + fileRev[1] + "'",
        if fileRev != listFilesRevs[-1]: print >> pipeName, ","
        else: print >> pipeName, ""
        
    print >> pipeName, ");"
    print >> pipeName, "?>"
    
    
def getParameters():

    usage = "usage: %program [options]"
    parser = OptionParser(usage=usage)

    parser.add_option("-d", "--directory", action="append", 
                      metavar="DIR",
                      help="add DIR directory to scan for static files (*.js and *.css)")

    parser.add_option("-o", "--output", type="string",
                      default="stdout", metavar="FILE", 
                      help="specify file to write the output; default standard output")
    
    (options,args)=parser.parse_args()
    
    if options.directory is None:
        print "You should specify at least one directory to scan for static files. See --help"
        sys.exit()

    if options.output == "stdout": options.output = sys.stdout 
    else: options.output = open(options.output, "w")

    return options
            

############################################################################
if __name__ == "__main__":
    options=getParameters()
    printPHP(getFilesRevs(options.directory), options.output)