Python script to create a new post in jekyll.

create_post.py

import argparse
from datetime import date
from pathlib import Path


FRONTMATTER_TEMPLATE = """---
layout: page
title: {args.title}
comments: true
published: true
categories:
tags:
---
"""

FILEEXISTSERROR_TEMPLATE = """Error
    Missing --overwrite option: The file {path} exists."""


def format_filename(
    title, publication_date: str = None, markdown_extension: str = "md"
):
    if publication_date is None:
        publication_date = date.today().isoformat()
    return f'{publication_date}-{title.replace(" ", "-").lower()}.{markdown_extension}'


def write_frontmatter(args):
    filename = format_filename(args.title, args.date)
    path = Path(f"./_posts/{filename}")
    try:
        path.touch(exist_ok=args.overwrite)
    except FileExistsError:
        print(FILEEXISTSERROR_TEMPLATE.format(path=path))
        exit(1)
    path.write_text(FRONTMATTER_TEMPLATE.format(args=args))


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Create a new post")
    parser.add_argument("title", type=str, help="Provide a title")
    parser.add_argument("--date", type=str, help="Provide a date in format yyyy-mm-dd")
    parser.add_argument(
        "--overwrite", action="store_true", help="Overwrite existing post"
    )
    args = parser.parse_args()
    write_frontmatter(args)

Call from the top-level directory of your jekyll site. (Where your _posts folder is).