#!/usr/bin/env python
"""Update Ghost via cli and change CSS for Casper default theme.

I like Casper, the Ghost standard theme. But I cannot stand the fact that the
first paragraph in every blog post is immensely huge. This might make sense for
journalists and magazines, but not for the majority of blogs. Since there are
often Casper updates with a new Ghost version, I needed a solution to
a) Update Ghost to the latest and greatest via cli
b) Remove the CSS for this horrible, horrible first paragraph.

Voila! It is not fool-proof, it is not beautiful, but it works and is in use.
"""

import re
import os
import argparse
import glob
import sys

if __name__ == "__main__":
    # Parsing arguments
    parser = argparse.ArgumentParser(
        prog='update_ghost_casper.py'
    )
    parser.add_argument(
        '-p',
        '--path',
        type=str,
        help='Ghost installation path'
    )
    args = parser.parse_args()
    ghost_path = args.path
    # Take the Ghost installation path as an argument.
    # If there is no path given, we stop right here.

    if ghost_path is None:
        print('No path specified')
        sys.exit(1)

    # Changing in the Ghost install dir and updating
    os.chdir(ghost_path)
    os.system('ghost update')

    # Changing into the Casper directory, install gulp and all of its
    # 500 million fucking prerequisites
    os.chdir('content/themes/casper/')
    npm_install_cmd = ('npm install autoprefixer cssnano gulp gulp-livereload '
                       'gulp-nodemon gulp-postcss gulp-sourcemaps gulp-util '
                       'gulp-watch postcss-color-function gulp-zip '
                       'postcss-custom-properties postcss-easy-import'
                       )
    os.system(npm_install_cmd)

    # Delete the old minified .map and CSS file
    built_css_files = 'assets/built/screen.css*'
    for file in glob.glob(built_css_files):
        os.remove(file)

    # Backup copy of the current CSS file
    os.rename('assets/css/screen.css', 'assets/css/screen.css.sav')
    # Yes, I know you should not 'slurp' the whole file, but due to the regex
    # it was the solution with the least headache potential I could think of
    with open("assets/css/screen.css.sav", 'r+') as f:
        css = f.read()
    f.close()

    # Remove that fucking CSS paragraph. Rip it out.
    newcss = re.sub('\.post-template \.kg-card-markdown > '
                    'p:first-child \{\n.*\n.*\n\}\n\n', '', css)

    # Write the new, updated CSS file to disk
    with open("assets/css/screen.css", 'w') as f:
        f.write(newcss)
    f.close()

    # Recreate the map and minified CSS file
    os.system('gulp css')
    # Go back to the Ghost install directory and restart to apply changes
    os.chdir(ghost_path)
    os.system('ghost restart')