update-tex-from-md.py

#!/usr/bin/env python

import git
import os.path
from subprocess import run
import optparse

def get_modified_files():
    repo = git.Repo()
    return [item.a_path for item in repo.index.diff(None)]

def get_staged_files():
    repo = git.Repo()
    return [item.a_path for item in repo.index.diff('HEAD')]

def filter_md(l):
    return [i for i in l
            if os.path.split(i)[0] == 'chapters'
                and os.path.splitext(i)[1] == '.md']

def run_pandoc(source):
    dest = os.path.splitext(source)[0] + ".tex"
    p = run(['pandoc',
             '--wrap=preserve',
             '--biblatex',
             '-f', 'markdown-auto_identifiers',
             '--template=chapter-template.pandoc',
             '--filter=pandoc-include',
             '-o', dest,
             source
             ])
    if p.returncode == 0:
        return dest

def add_to_stage(path):
    repo = git.Repo()
    repo.index.add(path)

def process(source, stage):
    print(f'Running pandoc on {source}...')
    if dest := run_pandoc(source):
        if stage:
            print(f'Adding {dest} to staging area...')
            add_to_stage(dest)

if __name__ == "__main__":
    oparser = optparse.OptionParser()
    oparser.add_option('-m', action='store_true', dest='modified')
    oparser.add_option('--no-stage', action='store_false', dest='stage', default=True)
    (options, args) = oparser.parse_args()

    if args not in [[''], []]:
        process(args[0] + '.md', options.stage)
    else:
        staged_md = set(filter_md(get_staged_files()))
        modified_md = (set(filter_md(get_modified_files())) if options.modified else set())
        files = staged_md.union(modified_md)

        for modified_md in files:
            process(modified_md, options.stage)