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common.py

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# This is free and unencumbered software released into the public

# domain.

# Anyone is free to copy, modify, publish, use, compile, sell, or

# distribute this software, either in source code form or as a

# compiled binary, for any purpose, commercial or non-commercial, and

# by any means.

# In jurisdictions that recognize copyright laws, the author or

# authors of this software dedicate any and all copyright interest in

# the software to the public domain. We make this dedication for the

# benefit of the public at large and to the detriment of our heirs

# and successors. We intend this dedication to be an overt act of

# relinquishment in perpetuity of all present and future rights to

# this software under copyright law.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY

# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF

# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# For more information, please refer to <http://unlicense.org>

"""Things that other scripts import and use.

The markdown files use / as a path separator. That's why they need the

posixpath module for processing paths, but they use functions in this

file when actually opening files.

"""

import contextlib

import itertools

import os

import posixpath

import re

import shutil

_LINK_REGEX = r'\[(.*?)\]\((.*?)\)'

def find_links(file):

"""Find all markdown links in a file object.

Yield (lineno, regexmatch) tuples.

"""

# don't yield same link twice

seen = set()

# we need to loop over the file two lines at a time to support

# multi-line (actually two-line) links, so this is kind of a mess

firsts, seconds = itertools.tee(file)

next(seconds) # first line is never second line

# we want 1-based indexing instead of 0-based and one-line links get

# caught from linepair[1], so we need to start at two

for lineno, linepair in enumerate(zip(firsts, seconds), start=2):

lines = linepair[0] + linepair[1]

for match in re.finditer(_LINK_REGEX, lines, flags=re.DOTALL):

if match.group(0) not in seen:

seen.add(match.group(0))

yield match, lineno

def get_markdown_files():

"""Yield the names of all markdown files in this tutorial.

This assumes that the README contains links to everything. The

yielded paths use / as the path separator.

"""

yield 'README.md'

with open('README.md', 'r') as f:

for match, lineno in find_links(f):

target = posixpath.normpath(match.group(2))

# Currently he README links to itself, but we don't want to

# break things if it will be modified not to link in the future.

if target.endswith('.md') and target != 'README.md':

yield target

def askyesno(question, default=True):

"""Ask a yes/no question and return True or False.

The default answer is yes if default is True and no if default is

False.

"""

if default:

# yes by default

question += ' [Y/n] '

else:

# no by default

question += ' [y/N] '

while True:

result = input(question).upper().strip()

if result == 'Y':

return True

if result == 'N':

return False

if not result:

return default

print("Please type y, n or nothing at all.")

def slashfix(path):

"""Replace / with os.sep."""

return path.replace('/', os.sep)

def slashfix_open(file, mode):

"""An easy way to use slashfix() and open() together."""

return open(slashfix(file), mode)

@contextlib.contextmanager

def backup(filename):

"""A context manager that backs up a file."""

shutil.copy(filename, filename + '.backup')

try:

yield

except Exception:

# It failed, we need to restore from the backup.

shutil.copy(filename + '.backup', filename)

else:

# Everything's fine, we can safely get rid of the backup.

os.remove(filename + '.backup')