Use your own logger

apply_theme is convenient but takes over the logger. When you want your own sinks or format, use the building blocks it’s made of.

configure_levels — colors + icons, no sink

Registers the theme’s per-level color and icon (via logger.level(...)) and adds no sink. Reference <level> and {level.icon} in your own format:

import sys
from loguru import logger
from loguru_themes import configure_levels

logger.remove()
configure_levels(logger, "dracula")           # colors + icons, no sink
logger.add(
    sys.stderr,
    format="<level>{level.icon} {level.name}</level> | {message}",
    colorize=True,
)

build_format — the theme’s format value

Hands you the loguru format value (a string, or a callable for themes with per-level message highlighting) for your own logger.add(...):

from loguru_themes import configure_levels, build_format

configure_levels(logger, "dracula")
logger.add("app.log", format=build_format("dracula"), colorize=True, rotation="10 MB")

Reference theme colors in a custom format

You don’t hardcode hex — read it from the theme. <level> auto-uses the current level’s color; for fixed parts interpolate theme.accent / dim / fg:

from loguru_themes import get_theme, configure_levels

theme = get_theme("dracula")
fmt = (
    f"<fg {theme.accent}>┃</>"
    f" <fg {theme.dim}>{{time:HH:mm:ss}}</>"
    f" <level>{{level.icon}} {{level.name: <8}}</level>"
    f" <fg {theme.fg}>{{message}}</>"
)
configure_levels(logger, theme)
logger.add(sys.stderr, format=fmt, colorize=True, level="TRACE")

A single level’s raw color token: theme.levels["ERROR"].markup() → '<fg #ff5555>'.

Console + file

colorize=None (the default) auto-detects the stream: color on a terminal, plain text in a file — no raw markup tags.

configure_levels(logger, "dracula")
fmt = build_format("dracula")
logger.add(sys.stderr, format=fmt, colorize=True)    # colored console
logger.add("app.log", format=fmt, colorize=False)    # plain file