#!/usr/bin/env python

# Josh's SVN wrapper script
# Recommend putting in path as 'jsvn' or something other than 'svn' and
# making an alias svn='jsvn'

import sys
import os
import re
from subprocess import *

PATH = os.environ['PATH'].split(os.pathsep)

def findInPath(cmd):
    for p in PATH:
        full_path = os.path.join(p, cmd)
        if os.path.exists(full_path):
            return full_path
    return ''

def getSVNURL(svn):
    for line in Popen([svn, 'info'], stdout=PIPE).communicate()[0].split('\n'):
        m = re.match('^URL:\s*(.*?)\s*$', line)
        if m is not None:
            return m.group(1)
    return ''

def getSVNRoot(svn):
    url = getSVNURL(svn)
    parts = url.split('/')
    for i in range(0, len(parts)):
        if parts[i] in ('trunk', 'tags', 'branches'):
            return '/'.join(parts[:i-1])
    return ''

def getSVNTopLevel(svn):
    url = getSVNURL(svn)
    parts = url.split('/')
    for i in range(0, len(parts)):
        if parts[i] == 'trunk' or i > 0 and parts[i-1] in ('tags', 'branches'):
            return '/'.join(parts[:i+1])
    return ''

def main(argv):
    realsvn = findInPath('svn')
    colorsvn = findInPath('colorsvn')
    colordiff = findInPath('colordiff')

    if realsvn == '':
        sys.stderr.write("Error: 'svn' not found in path\n")
        return 1

    if len(argv) >= 1 and argv[0] == "branch":
        if len(argv) < 2:
            sys.stderr.write("Must supply branch name\n")
            return 2
        branch_name = argv[1]
        origin = getSVNTopLevel(realsvn)
        root = getSVNRoot(realsvn)
        if origin == '' or root == '':
            sys.stderr.write("Could not determine origin/root URL\n")
            return 1
        comment = "Created '%s' branch" % branch_name
        branch_path = root + '/branches/' + branch_name
        Popen([realsvn, 'copy', origin, branch_path, '-m', comment]).wait()
        return 0

    if len(argv) >= 1 and argv[0] == "diff" and colordiff != '':
        diff_out = Popen([realsvn] + argv, stdout=PIPE).stdout
        Popen([colordiff], stdin=diff_out).wait()
        return 0

    if colorsvn != '':
        Popen([colorsvn] + argv).wait()
        return 0

    Popen([realsvn] + argv).wait()
    return 0

if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))