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#!/usr/bin/env python3

# 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>

"""Update ends of markdown files."""

import posixpath

import re

import common

END_TEMPLATE = """\

If you have trouble with this tutorial, please

[tell me about it]({toplevel}/contact-me.md) and I'll make this tutorial better,

or [ask for help online]({toplevel}/getting-help.md).

If you like this tutorial, please [give it a

star]({toplevel}/README.md#how-can-i-thank-you-for-writing-and-sharing-this-tutorial).

You may use this tutorial freely at your own risk. See

[LICENSE]({toplevel}/LICENSE).

{extralinks}[List of contents]({toplevel}/README.md#{readmeheader})

"""

CHAPTER_LINK_REGEX = r'^\d+\. \[.*\]$(.*\.md)$$'

def get_filenames():

"""Get chapter files and other files from README.

Return a two-tuple of chapter file names and other file names as

iterables of strings.

"""

chapters = []

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

# move to where the content list starts

while f.readline().strip() != "## List of contents":

pass

# now let's read the content list

for line in f:

line = line.strip()

if line.startswith('## '):

# end of content list

break

if line:

# not empty line

match = re.search(CHAPTER_LINK_REGEX, line)

if match is not None:

# it's a link to a chapter

chapters.append(match.group(1))

others = set(common.get_markdown_files()) - set(chapters)

return chapters, others

def update_end(filename, end):

"""Add *** and end to a file if it doesn't have them already.

filename should be relative to the toplevel using / as a path

separator.

"""

end = '\n***\n\n' + end

with open(filename, 'r') as f:

content = f.read()

if content.endswith(end):

# No need to do anything.

print(" Has correct end:", filename)

return

if '\n***\n' in content:

# We need to remove the old ending first.

print(" Removing old end:", filename)

where = content.index('\n***\n')

with open(filename, 'w') as f:

f.write(content[:where])

print(" Adding end:", filename)

with open(filename, 'a') as f:

f.write(end)

def main():

chapter_files, other_files = get_filenames()

# make previous of first file and next of last file to just bring

# back to README

prevs = ['README.md'] + chapter_files[:-1]

nexts = chapter_files[1:] + ['README.md']

print("Chapter files:")

for prevpath, thispath, nextpath in zip(prevs, chapter_files, nexts):

# all paths should be like 'section/file.md'

where = posixpath.dirname(thispath)

prev = posixpath.relpath(prevpath, where)

next_ = posixpath.relpath(nextpath, where)

extralinks = "[Previous](%s) | [Next](%s) |\n" % (prev, next_)

end = END_TEMPLATE.format(

toplevel='..', extralinks=extralinks, readmeheader=where)

update_end(thispath, end)

print()

print("Other files:")

for filename in other_files:

where = posixpath.dirname(filename)

end = END_TEMPLATE.format(

toplevel=posixpath.relpath('.', where),

extralinks="", readmeheader='list-of-contents')

update_end(filename, end)

if __name__ == '__main__':

main()

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