#!/usr/bin/env python3
# -*-coding: utf-8-*-
# Author : Christopher L
# Blog   : http://blog.chriscabin.com
# GitHub : https://www.github.com/chrisleegit
# File   : asort.py
# Date   : 2016/08/22 11:12
# Version: 0.1
# Description: A very simple python script that can sort items alphabetically.

from __future__ import print_function
import os
import shutil
import re


README_FILE = '../README.md'
TEMP_FILE = 'temp.md'

# only works for those items between BEGIN and END.
BEGIN = '## Applications'
END = '## Setup'

regex = re.compile(r"[^[]*\[([^]]*)\]")

def main():
    global README_FILE

    # make sure the script can find file: README.md
    README_FILE = os.path.abspath(README_FILE)

    if not os.path.exists(README_FILE):
        print(f'Error: no such file or directory: {README_FILE}')
        exit(1)

    sort_enable = False
    items = []

    print(f'Loading file: {README_FILE}')

    # read file: README.md
    with (open(README_FILE) as infile, open(TEMP_FILE, 'w') as outfile):
        # process each line
        for line in infile:
            if not sort_enable and BEGIN in line:
                sort_enable = True

            # if sort_enable and END in line:
            #     sort_enable = False

            if sort_enable and line.startswith(('-')):
                line = line.strip()
                items.append(line)
            elif sort_enable and not line.startswith(('-')) and line == '\n':
                # when we meet the next header, we should stop adding new item to the list.
                for item in sorted(items, key=lambda x: regex.findall(x.upper())[len(regex.findall(x.upper()))-1]):
                    # write the ordered list to the temporary file.
                    print(item, file=outfile)
                items.clear()

                # remember to put the next header in the temporary file.
                print(line, end='', file=outfile)
            elif (
                sort_enable
                and not line.startswith(('-'))
                and line != '\n'
                and line.startswith('#')
            ):
                sort_enable = END not in line
                print(line, end='', file=outfile)
            else:
                print(line, end='', file=outfile)
    print('Replace the original file: README.md')
    shutil.move(TEMP_FILE, README_FILE)


if __name__ == '__main__':
    main()