AsciiDoc HEADING CONVERSION

AsciiDoc HEADING CONVERSION

This commit changes all headings from two-line style to prefix/suffix
style. (For now, we're only doing this in the docs using Antora.) Example:

Heading 1
=========

becomes

= Heading 1 =

This conversion makes it much easier to adjust the heading levels of
several files which were previously included using the 'leveloffset'
command.

NOTE: Only the prefix is required, but we felt the suffix improves
readability of the source.

Below is the python script I used to do the conversion. It is slightly
modified from a script used by ___ here:

https://github.com/JanusGraph/janusgraph/pull/115/commits/dc67ce73c08e79fa65b30bc8280861056070c573

Here's my source:

import re
import sys

def main(argv):
    #http://asciidoctor.org/docs/asciidoc-recommended-practices/#section-titles
    patterns = [
        (re.compile('^=+$'), '='),
        (re.compile('^-+$'), '=='),
        (re.compile('^~+$'), '==='),
        (re.compile('^\^+$'), '===='),
        (re.compile('^\++$'), '====='),
    ]

    with open(argv[1], 'r') as input_file:
        prev_line = None
        curr_line = None
        for line in input_file.readlines():
            prev_line = curr_line
            curr_line = line

            if prev_line is None:
                continue

            for pattern, heading in patterns:
                if pattern.match(curr_line) and len(prev_line) == len(curr_line):
                    # remove newline so we can append suffix to heading
                    prev_line = prev_line.rstrip()
                    sys.stdout.write('%s %s %s\n' % (heading, prev_line, heading))
                    prev_line = None
                    curr_line = None
                    break

            if prev_line is not None:
                sys.stdout.write(prev_line)

        # end for
        if curr_line is not None:
            sys.stdout.write(curr_line)

    # end with

if __name__ == '__main__':
    main(sys.argv)

Signed-off-by: Remington Steed <rjs7@calvin.edu>