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"""ANSI color support for MILC.
"""
import sys
import re
import logging
import colorama
from typing import Any
from .emoji import EMOJI_LOGLEVELS
ansi_config = {
'color': True,
'unicode': sys.stdout.encoding.lower().startswith('utf'),
}
# Regex was gratefully borrowed from kfir on stackoverflow:
# https://stackoverflow.com/a/45448194
ansi_regex = r'\x1b(' \
r'(\[\??\d+[hl])|' \
r'([=<>a-kzNM78])|' \
r'([\(\)][a-b0-2])|' \
r'(\[\d{0,2}[ma-dgkjqi])|' \
r'(\[\d+;\d+[hfy]?)|' \
r'(\[;?[hf])|' \
r'(#[3-68])|' \
r'([01356]n)|' \
r'(O[mlnp-z]?)|' \
r'(/Z)|' \
r'(\d+)|' \
r'(\[\?\d;\d0c)|' \
r'(\d;\dR))'
ansi_escape = re.compile(ansi_regex, flags=re.IGNORECASE)
ansi_styles = (
('fg', colorama.ansi.AnsiFore()),
('bg', colorama.ansi.AnsiBack()),
('style', colorama.ansi.AnsiStyle()),
)
ansi_colors = {}
for prefix, obj in ansi_styles:
for color in [x for x in obj.__dict__ if not x.startswith('_')]:
ansi_colors[prefix + '_' + color.lower()] = getattr(obj, color)
def format_ansi(text: str) -> str:
"""Return a copy of text with certain strings replaced with ansi.
"""
# Avoid .format() so we don't have to worry about the log content
for color in ansi_colors:
text = text.replace('{%s}' % color, ansi_colors[color])
text = text + ansi_colors['style_reset_all']
if ansi_config['color']:
return text
return ansi_escape.sub('', text)
class MILCFormatter(logging.Formatter):
"""Formats log records per the MILC configuration.
"""
def format(self, record: Any) -> Any:
if ansi_config['unicode'] and record.levelname in EMOJI_LOGLEVELS:
record.levelname = format_ansi(EMOJI_LOGLEVELS[record.levelname])
msg = super().format(record)
return format_ansi(msg)
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