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"""Create Table of contents (TOC) for a single .md file or for a directory.

Usage:

toc.py FILE

toc.py DIR

To ignore file when generating TOC, put an empty line just before H1.

"""

import os

import sys

import re

import glob

def main():

"""Main entry point."""

if (len(sys.argv) == 1 or

"-h" in sys.argv or

"--help" in sys.argv or

"/?" in sys.argv):

print(__doc__.strip())

sys.exit(0)

arg1 = sys.argv[1]

if os.path.isdir(arg1):

(modified, warnings) = toc_dir(arg1)

if modified:

print("Done")

else:

print("No changes to TOCs. Files not modified.")

else:

(modified, warnings) = toc_file(arg1)

if modified:

print("Done")

else:

print("No changes to TOC. File not modified.")

if warnings:

print("Warnings: "+str(warnings))

def toc_file(file_):

"""A single file was passed to doctoc. Return bool whether modified

and the number of warnings."""

with open(file_, "rb") as fo:

orig_contents = fo.read()

# Fix new lines just in case. Not using Python's "rU",

# it is causing strange issues.

orig_contents = re.sub(r"(\r\n|\r|\n)", os.linesep, orig_contents)

(tocsize, contents, warnings) = create_toc(orig_contents, file_)

if contents != orig_contents:

with open(file_, "wb") as fo:

fo.write(contents)

tocsize_str = ("TOC size: "+str(tocsize) if tocsize

else "TOC removed")

print("Modified: "+file_+" ("+tocsize_str+")")

return True, warnings

else:

return False, warnings

def toc_dir(dir_):

"""A directory was passed to doctoc. Return bool whether any file was

modified and the number of warnings."""

files = glob.glob(os.path.join(dir_, "*.md"))

modified_any = False

warnings = 0

for file_ in files:

if "API-categories.md" in file_ or "API-index.md" in file_:

continue

(modified, warnings) = toc_file(file_)

if not modified_any:

modified_any = True if modified else False

return modified_any, warnings

def create_toc(contents, file_):

"""Create or modify TOC for the document contents."""

match = re.search(r"Table of contents:%s(\s*\* \[[^\]]+\]$[^)]+$%s){2,}"

% (os.linesep, os.linesep), contents)

oldtoc = match.group(0) if match else None

(tocsize, toc, warnings) = parse_headings(contents, file_)

if oldtoc:

if not toc:

# If toc removed need to remove an additional new lines

# that was inserted after toc.

contents = contents.replace(oldtoc+os.linesep, toc)

else:

contents = contents.replace(oldtoc, toc)

elif tocsize:

# Insert after H1, but if there is text directly after H1

# then insert after that text.

first_line = False

if not re.search(r"^#\s+", contents):

print("WARNING: missing H1 on first line. Ignoring file: "+file_)

return 0, contents, warnings+1

lines = contents.splitlines()

contents = ""

toc_inserted = False

for line in lines:

if not first_line:

first_line = True

else:

if not toc_inserted and re.search(r"^(##|###)", line):

contents = contents[0:-len(os.linesep)]

contents += os.linesep + toc + os.linesep + os.linesep

toc_inserted = True

contents += line + os.linesep

return tocsize, contents, warnings

def parse_headings(raw_contents, file_):

"""Parse contents looking for headings. Return a tuple with number

of TOC elements, the TOC fragment and the number of warnings."""

# Remove code blocks

parsable_contents = re.sub(r"```[\s\S]+?```", "", raw_contents)

# Parse H1,H2,H3

headings = re.findall(r"^(#|##|###)\s+(.*)", parsable_contents,

re.MULTILINE)

toc = "Table of contents:" + os.linesep

tocsize = 0

warnings = 0

count_h1 = 0

count_h2 = 0

for heading in headings:

level = heading[0]

level = (1 if level == "#" else

2 if level == "##" else

3 if level == "###" else None)

assert level is not None

title = heading[1].strip()

if level == 1:

count_h1 += 1

if count_h1 > 1:

warnings += 1

print("WARNING: found more than one H1 in "+file_)

continue

if level == 2:

count_h2 += 1

hash_ = headinghash(title)

indent = ""

if level == 3:

if count_h2:

# If there was no H2 yet then H3 shouldn't have indent.

indent = " " * 2

toc += indent + "* [%s](#%s)" % (title, hash_) + os.linesep

tocsize += 1

if tocsize <= 1:

# If there is only one H2/H3 heading do not create TOC.

toc = ""

tocsize = 0

return tocsize, toc, warnings

def headinghash(title):

"""Get a link hash for a heading H1,H2,H3."""

hash_ = title.lower()

hash_ = re.sub(r"[^a-z0-9_\- ]+", r"", hash_)

hash_ = hash_.replace(" ", "-")

hash_ = re.sub(r"[-]+", r"-", hash_)

hash_ = re.sub(r"-$", r"", hash_)

return hash_

if __name__ == "__main__":

main()

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