## Logging Use `sway_log(importance, fmt, ...)` to log. The following importances are available: * `L_DEBUG`: Debug messages, only shows with `sway -d` * `L_INFO`: Informational messages * `L_ERROR`: Error messages `sway_log` is a macro that calls `_sway_log` with the current filename and line number, which are written into the log with your message. ## Assertions In the compositor, assertions *must not* be fatal. All error cases must be handled as gracefully as possible - crashing the compositor will make the user lose all of their work. Use `sway_assert(condition, fmt, ...)` to perform an assertion. This returns `condition`, which you must handle if false. An error will be logged if the assertion fails. Outside of the compositor (swaymsg, swaybar, etc), using `assert.h` is permitted.