#!/usr/bin/env python

import os.path
import sys
import pybaz
import shutil
import datetime
import subprocess

if not os.path.exists("./{arch}"):
    print "This is not a working tree"
    sys.exit(1)

tree = pybaz.WorkingTree("./")

if not tree.has_changes():
    print "There are no changes to comment"
    sys.exit(0)

tmpdir = ".update-ChangeLog.tmp"
if os.path.exists(tmpdir):
    shutil.rmtree(tmpdir)

changes = tree.changes (None, tmpdir)

changed_files = []

for change in changes.iter_created_files():
    changed_files += [("created", change[2])]

for change in changes.iter_removed_files():
    changed_files += [("removed", change[2])]

for change in changes.iter_patched_files():
    changed_files += [("modified", change[2])]

entry = ""
today = datetime.datetime.now()
entry += "%04d-%02d-%02d  %s  <%s>\n" % (today.year, today.month, today.day, os.environ["REAL_NAME"], os.environ["EMAIL_ADDRESS"])

for cf in changed_files:
    if cf[1] == "ChangeLog":
	continue
    if cf[0] == "created":
	entry += "\t* Added %s\n" % cf[1]
    elif cf[0] == "removed":
	entry += "\t* Removed %s\n" % cf[1]
    else:
	entry += "\t* %s: \n" % cf[1]

oldclf = open("ChangeLog", "r")
oldcl = oldclf.read()
oldclf.close()
shutil.move("ChangeLog", "ChangeLog.old")
cfl = open("ChangeLog", "w")
cfl.write(entry)
cfl.write("\n")
cfl.write(oldcl)
cfl.close()

subprocess.call([os.environ["EDITOR"], "ChangeLog"])

if os.path.exists(tmpdir):
    shutil.rmtree(tmpdir)