threadwiki: PEP8 python entry to the Shortest Wiki Contest named for the threadsnake

threadwiki.py

import glob
import os
import time

import markdown2
from flask import Flask, redirect, request

app = Flask(__name__)


@app.route("/<page>")
def show(page):
    path = f"pages/{page}"
    if not os.path.exists(path):
        return redirect(f"/{page}/edit")
    return f"""<h1><a href='/{page}/back'>{page}</a></h1>
    {markdown2.markdown_path(path)}<a href='/{page}/edit'>edit</a>
    last edit was {time.ctime(os.path.getmtime(path))}"""


@app.route("/<page>/edit", methods=['POST', 'GET'])
def edit(page):
    path = f"pages/{page}"
    if request.method == 'POST':
        open(path, 'w').write(request.form['new'])
        return redirect(f"/{page}")

    return f"""<h1>Edit {page}</h1><form method=post><textarea name=new>{open(
    path, 'r').read() if os.path.exists(path) else ""}</textarea>
    <input type=submit></form>"""


@app.route("/<page>/back")
def back(page):
    backs = [f"<li><a href='/{file[6:]}'>{file[6:]}</a></li>" for file in
             glob.glob("pages/*") if f"/{page}" in open(file, "r").read()]
    return f"<h1>Links to {page}</h1><ul>{''.join(backs)}</ul>"


if __name__ == '__main__':
    app.run()