Log a message with timestamp — log

Prints a timestamped message to the console. Supports glue-style interpolation of variables from the calling environment. Optionally prints and returns a variable value, useful for debugging pipelines.

Usage

log_message(msg, variable = NULL)

log_msg(msg, variable = NULL)

Arguments

msg: Character. Message to log, supports glue syntax for variable interpolation.
variable: Optional. If provided, appends the value to the message and returns it invisibly.

Value

Invisibly returns NULL, or the variable if provided.

Examples

# Simple message
log_message("Starting the process...")
#> [2026-04-03 09:22:16] Starting the process...

# With variable interpolation
iso3 <- "KEN"
log_message("Processing {iso3}...")
#> [2026-04-03 09:22:16] Processing KEN...

# With variable return (useful in pipelines)
result <- log_message("Computed value", 42)
#> [2026-04-03 09:22:16] Computed value: 42