rtlxgen

#!/usr/bin/python

import argparse
import os
import os.path
import subprocess

from cssjanus import cssjanus

RTL_SUFFIX = "-rtlx"
EXTENSIONS = set(["css", "jpg", "jpeg", "png", "gif"])
CSS_HEADER = '/* AUTOGENERATED FILE - DO NOT EDIT */\n\n'

class FileInfo():
    def __init__(self):
        self.base = None
        self.ext = None
        self.ltr_exists = False
        self.rtl_exists = False

    def rtl_filename(self):
        return self.base + RTL_SUFFIX + self.ext

    def ltr_filename(self):
        return self.base + self.ext

# from Python Cookbook by Alex Martelli, David Ascher - http://my.safaribooksonline.com/book/programming/python/0596001673/files/pythoncook-chp-4-sect-16
def splitall(path):
    allparts = []
    while 1:
        parts = os.path.split(path)
        if parts[0] == path:  # sentinel for absolute paths
            allparts.insert(0, parts[0])
            break
        elif parts[1] == path: # sentinel for relative paths
            allparts.insert(0, parts[1])
            break
        else:
            path = parts[0]
            allparts.insert(0, parts[1])
    return allparts

def main():
    files_dict = {}
    for root, dirs, files in os.walk(args.path):
        if not 'files' in splitall(root): # ignore 'files' directories
            for name in files:
                path = os.path.join(root, name)
                base, extension = os.path.splitext(path)
                if extension[1:].lower() in EXTENSIONS:
                    is_rtl = base.endswith(RTL_SUFFIX)
                    base_no_suffix = base[:-len(RTL_SUFFIX)] if is_rtl else base
                    key = (base_no_suffix, extension)
                    if not key in files_dict:
                        fi = files_dict[key] = FileInfo()
                        fi.base = base_no_suffix
                        fi.ext = extension
                    else:
                        fi = files_dict[key]
                    if is_rtl:
                        fi.rtl_exists = True
                    else:
                        fi.ltr_exists = True
    for key, fi in files_dict.iteritems():
        if args.clean:
            if fi.rtl_exists:
                if args.verbose: print "Removing RTL file '" + fi.rtl_filename() + "'"
                os.remove(fi.rtl_filename())
        else:
            if fi.rtl_exists and not fi.ltr_exists:
                if args.verbose: print "Removing orphaned RTL file '" + fi.rtl_filename() + "'"
                os.remove(fi.rtl_filename())
            else:
                if (not fi.rtl_exists) or (os.path.getmtime(fi.rtl_filename()) < os.path.getmtime(fi.ltr_filename())):
                    if args.verbose: print "Converting '" + fi.ltr_filename() + "' to '" + fi.rtl_filename() + "'"
                    if fi.ext.lower() == ".css":
                        source = open(fi.ltr_filename(), 'r')
                        target = open(fi.rtl_filename(), 'w')
                        fixed_lines = cssjanus.ChangeLeftToRightToLeft(source.readlines())
                        target.write(CSS_HEADER + ''.join(fixed_lines))
                        target.close()
                        source.close()
                    elif fi.ext.lower() == ".gif":
                        subprocess.call(["gm", "convert", "-coalesce",  fi.ltr_filename(), fi.rtl_filename()])
                        subprocess.call(["gm", "mogrify", "-flop",  fi.rtl_filename()])
                    else:
                        subprocess.call(["gm", "convert", "-flop",  fi.ltr_filename(), fi.rtl_filename()])

parser = argparse.ArgumentParser(description="Produce RTL stylesheets and images for anything under PATH (recursively).")
parser.add_argument("path", metavar="PATH")
parser.add_argument("--clean", help="delete all files with a '-rtlx' suffix.", action="store_true")
parser.add_argument("-v", "--verbose", help="print more info.", action="store_true")
args = parser.parse_args()
main()