#!/usr/bin/env python
'''Print changes from last label '''

# =====================================================
# Copyright (c) Miki Tebeka <miki.tebeka@gmail.com>
# This file is under the GNU Public License (GPL), see
# http://www.gnu.org/copyleft/gpl.html for more details
# =====================================================

__author__ = "Miki Tebeka <miki.tebeka@gmail.com>"
# $Id: //guest/miki_tebeka/change_log.py#2 $

from os import popen, environ
from datetime import date

def client_path(client):
    '''Return path for client'''
    return "//%s/..." % client

def chlog(client, label):
    '''Return lines of last change'''

    # Client path
    path = client_path(client)

    # Last changelist
    last = popen("p4 changes -m1 %s" % path).read().split()[1]
    # Previous change list
    prev = popen("p4 changes -m1 %s@%s" % (path, label)).read().split()[1]
    # Get all change list data (without diff)
    s = "" # Return value
    for line in popen("p4 changes %s@%s,@%s" % (path, prev, last)):
        change = line.split()[1]
        s += popen("p4 describe -s %s" % change).read()

    return s

def get_last_label(client):
    '''Get last label for client'''
    label = ""
    max_date = None
    # Get last label
    for line in popen("p4 labels %s" % client_path(client)):
        fields = line.strip().split()
        l = fields[1] # Current label
        y, m, d = fields[2].split("/") # Current date
        d = date(int(y), int(m), int(d))
        if not label:
            label = l
            max_date = d
            continue
        # Check if label is newer than current
        if max_date < d:
            max_date = d
            label = l

    return label


if __name__ == "__main__":
    from optparse import OptionParser

    parser = OptionParser("usgae: %prog [options]",
                          version="%prog version 0.0.2")
    parser.add_option("-c", help="client name", dest="client",
        default="")
    parser.add_option("-l", help="last label name", dest="label",
            default="")

    opts, args = parser.parse_args()
    if args:
        parser.error("wrong number of arguments") # Will exit


    if not opts.client:
        try:
            opts.client = environ["P4CLIENT"]
        except KeyError:
            raise SystemExit("error: P4CLIENT not set and -c not given")

    if not opts.label:
        opts.label = get_last_label(opts.client)
        if not opts.label:
            m = "error: last label for %s not found and -l not specified" % \
                    client
            raise SystemExit(msg)

    print chlog(opts.client, opts.label)