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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 itertools import count
import configparser
import os
import random
import re
import string
import sys
from yoyo.config import CONFIG_EDITOR_KEY
try:
import termios
def getch():
"""
Read a single character without echoing to the console and without
having to wait for a newline.
"""
fd = sys.stdin.fileno()
saved_attributes = termios.tcgetattr(fd)
try:
attributes = termios.tcgetattr(fd) # get a fresh copy!
attributes[3] = attributes[3] & ~(termios.ICANON | termios.ECHO)
attributes[6][termios.VMIN] = 1
attributes[6][termios.VTIME] = 0
termios.tcsetattr(fd, termios.TCSANOW, attributes)
a = sys.stdin.read(1)
finally:
# be sure to reset the attributes no matter what!
termios.tcsetattr(fd, termios.TCSANOW, saved_attributes)
return a
except ImportError:
try:
from msvcrt import getwch as getch
except ImportError:
# some non Windows environments don't have termios (google cloud)
# running yoyo through the python sdk should not require `getch`
pass
def prompt(prompt, options):
"""
Display the given prompt and list of options and return the user selection.
"""
while True:
sys.stdout.write("%s [%s]: " % (prompt, options))
sys.stdout.flush()
ch = getch()
if ch == os.linesep:
ch = (
[o.lower() for o in options if "A" <= o <= "Z"]
+ list(options.lower())
)[0]
print(ch)
if ch.lower() not in options.lower():
print("Invalid response, please try again!")
else:
break
return ch.lower()
def confirm(s, default=None):
options = "yn"
if default:
default = default.lower()
if default == "y":
options = "Yn"
elif default == "n":
options = "yN"
return prompt(s, options) == "y"
def plural(quantity, one, plural):
"""
>>> plural(1, '%d dead frog', '%d dead frogs')
'1 dead frog'
>>> plural(2, '%d dead frog', '%d dead frogs')
'2 dead frogs'
"""
if quantity == 1:
return one.replace("%d", "%d" % quantity)
return plural.replace("%d", "%d" % quantity)
def get_editor(config):
"""
Return the user's preferred visual editor
"""
try:
return config.get("DEFAULT", CONFIG_EDITOR_KEY)
except configparser.NoOptionError:
pass
for key in ["VISUAL", "EDITOR"]:
editor = os.environ.get(key, None)
if editor:
return editor
return "vi"
def get_random_string(length, chars=(string.ascii_letters + string.digits)):
"""
Return a random string of ``length`` characters
"""
rng = random.SystemRandom()
return "".join(rng.choice(chars) for i in range(length))
def change_param_style(target_style, sql, bind_parameters):
"""
:param target_style: A DBAPI paramstyle value (eg 'qmark', 'format', etc)
:param sql: An SQL str
:bind_parameters: A dict of bind parameters for the query
:return: tuple of `(sql, bind_parameters)`. ``sql`` will be rewritten with
the target paramstyle; ``bind_parameters`` will be a tuple or
dict as required.
"""
if target_style == "named":
return sql, bind_parameters
positional = target_style in {"qmark", "numeric", "format"}
if not bind_parameters:
return (sql, (tuple() if positional else {}))
param_gen = {
"qmark": lambda name: "?",
"numeric": lambda name, c=count(1): ":{}".format(next(c)),
"format": lambda name: "%s",
"pyformat": lambda name: "%({})s".format(name),
}[target_style]
pattern = re.compile(
# Don't match if preceded by backslash (an escape)
# or ':' (an SQL cast, eg '::INT')
r"(?<![:\\])"
# one of the given bind_parameters
r":("
+ "|".join(re.escape(k) for k in bind_parameters)
+ r")"
# followed by a non-word char, or end of string
r"(?=\W|$)"
)
transformed_sql = pattern.sub(lambda match: param_gen(match.group(1)), sql)
if positional:
positional_params = []
for match in pattern.finditer(sql):
param_name = match.group(1)
positional_params.append(bind_parameters[param_name])
return transformed_sql, tuple(positional_params)
return transformed_sql, bind_parameters
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