Python script, ASCII text executable
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"""
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This module is under development and not yet in use in Roundabout. It is
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an experiment to try syntax highlighting in the application's web interface.
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Roundabout - git hosting for everyone <https://roundabout-host.com>
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Copyright (C) 2023-2025 Roundabout developers <root@roundabout-host.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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from pygments import highlight
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from pygments.style import Style
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from pygments import token
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from pygments.lexers import PythonLexer
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from pygments.formatters import HtmlFormatter
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from bs4 import BeautifulSoup
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class CustomStyle(Style):
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default_style = ""
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styles = {
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token.Text: "",
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token.Keyword: "bold #ff9800",
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token.Name: "",
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token.Operator: "",
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token.Name.Class: "#ffeb3b",
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token.Name.Function: "#be9ddb",
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token.Name.Builtin: "#ab47bc",
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token.Name.Attribute: "#4db6ac",
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token.Name.Constant: "italic #ef5350",
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token.Name.Decorator: "#bcaaa4",
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token.Name.Function.Magic: "#e040fb",
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token.Name.Label: "#ff4081",
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token.String: "#8bc34a",
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token.Number: "#42a5f5",
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token.Punctuation: "#ff9800",
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token.Comment: "italic #b0bec5",
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token.Generic: "",
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token.Escape: "#ff5722",
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token.String.Escape: "#ff5722",
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token.String.Regex: "#ffffff",
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token.Comment.Preproc: "#536dfe",
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token.Comment.Hashbang: "#536dfe",
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token.Error: "#f44336",
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token.Other: "",
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token.Whitespace: "",
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}
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code = """
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___all___ = ["hello_world"]
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def interesting_function(func: Callable) -> Callable:
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\"\"\"Print the function's result when called.
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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam nec nulla
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nec nulla laoreet fermentum. Integer id lacus ut odio interdum ultricies.
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\"\"\"
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def wrapper(*args, **kwargs):
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result = func(*args, **kwargs) # avoid double evaluation
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print(result)
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return result
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return wrapper
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@interesting_function
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def hello_world():
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return "Hello, world!\\a" # a nice bell
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if __name__ == "__main__":
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hello_world()
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"""
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lexer = PythonLexer()
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formatter = HtmlFormatter(style="colorful")
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html_code = highlight(code, lexer, formatter)
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soup = BeautifulSoup(html_code, "html.parser")
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pre = soup.find("pre")
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lines = pre.decode_contents().splitlines()
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for line in lines:
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line_soup = BeautifulSoup(line, "html.parser")
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clean_line = line_soup.prettify()
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print(clean_line)
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