stagit

#!/usr/bin/env python3

import pygments
from pygments import highlight
from pygments.formatters import HtmlFormatter
from pygments.lexers import guess_lexer, guess_lexer_for_filename

from sys import stdin, stderr

filename = stdin.readline().strip()
contents = stdin.read()

lexer=None

try:
    lexer = guess_lexer_for_filename(filename, contents)
except pygments.util.ClassNotFound:
    try:
        lexer = guess_lexer(contents)
    except pygments.util.ClassNotFound:
        pass

if lexer is None:
    from pygments.lexers import TextLexer
    lexer = TextLexer()

rendered = None
if lexer.__class__ is pygments.lexers.MarkdownLexer:
    from markdown import markdown
    rendered = markdown(contents, extensions=[
        'codehilite',
        'extra',
        'sane_lists',
        'smarty',
        'pymdownx.tasklist'
    ])

FORMAT = HtmlFormatter(
    style='murphy',
    cssclass='highlight',
    linenos='table',
    lineanchors='loc',
    anchorlinenos=True)

if rendered:
    print('<article class="markup markdown">')
    print(rendered)
    print('</article>')
print('<div id="blob">')
print(highlight(contents, lexer, FORMAT))
print('</div>')
print('<style>')
print(FORMAT.get_style_defs(''))
print('</style>')

print("Filename: {}; Lexer: {}.".format(filename, lexer), file=stderr)
if rendered:
    print("Markdown was rendered in addition.", file=stderr)