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# Copyright 2015 Oliver Cope
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import print_function
from __future__ import unicode_literals
from datetime import date
from textwrap import dedent
from tempfile import NamedTemporaryFile
import glob
import logging
import io
import re
import shlex
import subprocess
import sys
import traceback
from text_unidecode import unidecode
from yoyo import default_migration_table
from yoyo.compat import configparser
from yoyo.config import CONFIG_NEW_MIGRATION_COMMAND_KEY
from yoyo.migrations import read_migrations, heads, Migration
from yoyo import utils
from .main import InvalidArgument
from os import path, stat, unlink, rename
logger = logging.getLogger('yoyo.migrations')
tempfile_prefix = '_tmp_yoyonew'
migration_template = dedent('''\
"""
{message}
"""
from yoyo import step
__depends__ = {{{depends}}}
steps = [
step("")
]
''')
def install_argparsers(global_parser, subparsers):
parser_new = subparsers.add_parser('new',
parents=[global_parser],
help="Create a new migration")
parser_new.set_defaults(func=new_migration)
parser_new.add_argument('--message', '-m', help='Message', default='')
parser_new.add_argument("--migration-table", dest="migration_table",
action="store",
default=default_migration_table,
help="Name of table to use for storing "
"migration metadata")
parser_new.add_argument('sources',
nargs="*",
help="Source directory of migration scripts")
parser_new.add_argument("-d",
"--database",
default=None,
help="Database, eg 'sqlite:///path/to/sqlite.db' "
"or 'postgresql://user@host/db'")
def new_migration(args, config):
try:
directory = args.sources[0]
except IndexError:
raise InvalidArgument("Please specify a migrations directory")
message = args.message
migrations = read_migrations(directory)
depends = sorted(heads(migrations), key=lambda m: m.id)
migration_source = migration_template.format(
message=message,
depends=', '.join('{!r}'.format(m.id) for m in depends))
if args.batch_mode:
p = make_filename(config, directory, message)
with io.open(p, 'w', encoding='UTF-8') as f:
f.write(migration_source)
else:
p = create_with_editor(config, directory, migration_source)
if p is None:
return
try:
command = config.get('DEFAULT',
CONFIG_NEW_MIGRATION_COMMAND_KEY)
command = [part.format(p) for part in shlex.split(command)]
logger.info("Running command: %s", ' '.join(command))
subprocess.call(command)
except configparser.NoOptionError:
pass
print("Created file", p)
def slugify(message):
s = unidecode(message)
s = re.sub(re.compile(r'[^-a-z0-9]+'), '-', s.lower())
s = re.compile(r'-{2,}').sub('-', s).strip('-')
return s
def make_filename(config, directory, message):
lines = (l.strip() for l in message.split('\n'))
lines = (l for l in lines if l)
message = next(lines, None)
if message:
slug = '-' + slugify(message)
else:
slug = ''
datestr = date.today().strftime('%Y%m%d')
number = '01'
rand = utils.get_random_string(5)
try:
prefix = config.get('DEFAULT', 'prefix')
except configparser.NoOptionError:
prefix = ''
for p in glob.glob(path.join(directory, '{}{}_*'.format(prefix, datestr))):
n = path.basename(p)[len(prefix) + len(datestr) + 1:].split('_')[0]
try:
if number <= n:
number = str(int(n) + 1).zfill(2)
except ValueError:
continue
return path.join(directory, '{}{}_{}_{}{}.py'.format(
prefix, datestr, number, rand, slug))
def create_with_editor(config, directory, migration_source):
editor = utils.get_editor(config)
tmpfile = NamedTemporaryFile(dir=directory,
prefix=tempfile_prefix,
suffix='.py',
delete=False)
try:
with io.open(tmpfile.name, 'w', encoding='UTF-8') as f:
f.write(migration_source)
editor = [part.format(tmpfile.name) for part in shlex.split(editor)]
if not any(tmpfile.name in part for part in editor):
editor.append(tmpfile.name)
mtime = stat(tmpfile.name).st_mtime
sys.path.insert(0, directory)
while True:
try:
subprocess.call(editor)
except OSError:
print("Error: could not open editor!")
else:
if stat(tmpfile.name).st_mtime == mtime:
print("abort: no changes made")
return None
try:
migration = Migration(None, tmpfile.name)
migration.load()
message = migration.ns['__doc__']
break
except Exception:
message = ''
print("Error loading migration")
print(traceback.format_exc())
print()
r = utils.prompt("Retry editing?", "Ynq?")
if r == 'q':
return None
elif r == 'y':
continue
elif r == 'n':
break
elif r == '?':
print("")
print("y: reopen the migration file in your editor")
print("n: save the migration as-is, without re-editing")
print("q: quit without saving the migration")
print("")
print("?: show this help")
continue
sys.path = sys.path[1:]
filename = make_filename(config, directory, message)
rename(tmpfile.name, filename)
return filename
finally:
try:
unlink(tmpfile.name)
except OSError:
pass
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