zulip/tools/setup/build_pygments_data

#!/usr/bin/env python3
import json
import os

from pygments.lexers import get_all_lexers

ZULIP_PATH = os.path.join(os.path.dirname(os.path.abspath(__file__)), '../../')
DATA_PATH = os.path.join(ZULIP_PATH, 'tools', 'setup', 'lang.json')
OUT_PATH = os.path.join(ZULIP_PATH, 'static', 'generated', 'pygments_data.json')

with open(DATA_PATH) as f:
    priorities = json.load(f)

lexers = get_all_lexers()
langs = {
    alias: {
        'priority': priorities.get(alias, 0),
        'pretty_name': longname,
    }
    for longname, aliases, filename_patterns, mimetypes in lexers
    for alias in aliases
}

for name in priorities:
    if langs.get(name) is None:
        langs[name] = {
            'priority': priorities[name],
            'pretty_name': name,
        }

with open(OUT_PATH, 'w') as f:
    json.dump({"langs": langs}, f)