Format a log message with glue::glue() and ANSI escape codes to add colors

Colour log levels based on their severity. Log levels are coloured with colorize_by_log_level() and the messages are coloured with grayscale_by_log_level().

Usage

layout_glue_colors(
  level,
  msg,
  namespace = NA_character_,
  .logcall = sys.call(),
  .topcall = sys.call(-1),
  .topenv = parent.frame(),
  .timestamp = Sys.time()
)

Arguments

level

log level, see log_levels() for more details

msg

string message

namespace

string referring to the logger environment / config to be used to override the target of the message record to be used instead of the default namespace, which is defined by the R package name from which the logger was called, and falls back to a common, global namespace.

.logcall

the logging call being evaluated (useful in formatters and layouts when you want to have access to the raw, unevaluated R expression)

.topcall

R expression from which the logging function was called (useful in formatters and layouts to extract the calling function's name or arguments)

.topenv

original frame of the .topcall calling function where the formatter function will be evaluated and that is used to look up the namespace as well via logger:::top_env_name

.timestamp

The time the logging occured. Defaults to the current time but may be overwritten if the logging is delayed from the time it happend

Value

character vector

Note

This functionality depends on the crayon package.

See also

Other log_layouts: get_logger_meta_variables(), layout_blank(), layout_gha(), layout_glue(), layout_glue_generator(), layout_json(), layout_json_parser(), layout_logging(), layout_simple()

Examples

log_layout(layout_glue_colors)
log_threshold(TRACE)
log_info("Starting the script...")
#> INFO [2026-01-06 21:43:03] Starting the script...
log_debug("This is the second line")
#> DEBUG [2026-01-06 21:43:03] This is the second line
log_trace("That is being placed right after the first one.")
#> TRACE [2026-01-06 21:43:03] That is being placed right after the first one.
log_warn("Some errors might come!")
#> WARN [2026-01-06 21:43:03] Some errors might come!
log_error("This is a problem")
#> ERROR [2026-01-06 21:43:03] This is a problem
log_debug("Getting an error is usually bad")
#> DEBUG [2026-01-06 21:43:03] Getting an error is usually bad
log_error("This is another problem")
#> ERROR [2026-01-06 21:43:03] This is another problem
log_fatal("The last problem.")
#> FATAL [2026-01-06 21:43:03] The last problem.