1#!/usr/bin/env python3
2# SPDX-License-Identifier: GPL-2.0
3#
4# Utilities for printing and coloring output.
5#
6# Copyright (C) 2022, Google LLC.
7# Author: Daniel Latypov <dlatypov@google.com>
8
9import datetime
10import sys
11import typing
12
13_RESET = '\033[0;0m'
14
15class Printer:
16	"""Wraps a file object, providing utilities for coloring output, etc."""
17
18	def __init__(self, output: typing.IO[str]):
19		self._output = output
20		self._use_color = output.isatty()
21
22	def print(self, message: str) -> None:
23		print(message, file=self._output)
24
25	def print_with_timestamp(self, message: str) -> None:
26		ts = datetime.datetime.now().strftime('%H:%M:%S')
27		self.print(f'[{ts}] {message}')
28
29	def _color(self, code: str, text: str) -> str:
30		if not self._use_color:
31			return text
32		return code + text + _RESET
33
34	def red(self, text: str) -> str:
35		return self._color('\033[1;31m', text)
36
37	def yellow(self, text: str) -> str:
38		return self._color('\033[1;33m', text)
39
40	def green(self, text: str) -> str:
41		return self._color('\033[1;32m', text)
42
43	def color_len(self) -> int:
44		"""Returns the length of the color escape codes."""
45		return len(self.red(''))
46
47# Provides a default instance that prints to stdout
48stdout = Printer(sys.stdout)
49