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#!/usr/bin/env python3
from starlette.applications import Starlette
from starlette.responses import HTMLResponse
from starlette.routing import Route
import pygments
from pygments.formatters import HtmlFormatter
from pygments.lexers import guess_lexer, guess_lexer_for_filename
from pygments.lexers.special import TextLexer
from pygments.util import ClassNotFound
formatter = None
async def startup_task():
guess_lexer('')
global formatter
formatter = HtmlFormatter(style='pastie', nobackground=True)
def do_highlight(filename, data):
try:
lexer = guess_lexer_for_filename(filename, data)
except ClassNotFound:
try:
lexer = guess_lexer(data)
# SqlLexer always gives 0.01
if lexer.analyse_text(data) <= 0.01:
lexer = TextLexer()
except ClassNotFound:
lexer = TextLexer()
return ''.join([
f'<!-- Pygments {pygments.__version__}: {lexer.name} ({lexer.__class__.__name__}) -->',
'<style>', formatter.get_style_defs('.highlight'), '</style>',
pygments.highlight(data, lexer, formatter)
])
async def run_highlight(request):
return HTMLResponse(do_highlight(request.query_params['filename'], await request.body()))
app = Starlette(
routes=[
Route('/highlight', run_highlight, methods=["POST"]),
],
on_startup=[startup_task],
)
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