add tracing

include/log.h

@@ -10,6 +10,7 @@ enum log_importance {
 	LOG_ERROR = 1,
 	LOG_INFO = 2,
 	LOG_DEBUG = 3,
+	LOG_TRACE = 4,
 	LOG_IMPORTANCE_LAST,
 };
 
@@ -24,6 +25,8 @@ void swaylock_log_init(enum log_importance verbosity);
 void _swaylock_log(enum log_importance verbosity, const char *format, ...)
 	_ATTRIB_PRINTF(2, 3);
 
+void _swaylock_trace(const char *file, int line, const char *func);
+
 const char *_swaylock_strip_path(const char *filepath);
 
 #define swaylock_log(verb, fmt, ...) \
@@ -33,4 +36,7 @@ const char *_swaylock_strip_path(const char *filepath);
 #define swaylock_log_errno(verb, fmt, ...) \
 	swaylock_log(verb, fmt ": %s", ##__VA_ARGS__, strerror(errno))
 
+#define swaylock_trace() \
+	_swaylock_trace(__FILE__, __LINE__, __func__)
+
 #endif

log.c

@@ -15,6 +15,7 @@ static const char *verbosity_colors[] = {
 	[LOG_ERROR ] = "\x1B[1;31m",
 	[LOG_INFO  ] = "\x1B[1;34m",
 	[LOG_DEBUG ] = "\x1B[1;30m",
+	[LOG_TRACE ] = "\x1B[1;32m",
 };
 
 void swaylock_log_init(enum log_importance verbosity) {
@@ -58,11 +59,22 @@ void _swaylock_log(enum log_importance verbosity, const char *fmt, ...) {
 	va_end(args);
 }
 
+// This is mainly here for performance.
+// Don't want to do _swaylock_strip_path every event if we're not tracing.
+void _swaylock_trace(const char *file, int line, const char *func) {
+	if (LOG_TRACE > log_importance) {
+		return;
+	}
+
+	_swaylock_log(LOG_TRACE, "[%s:%d]: trace: %s",
+			_swaylock_strip_path(file), line, func);
+}
+
 const char *_swaylock_strip_path(const char *filepath) {
 	if (*filepath == '.') {
 		while (*filepath == '.' || *filepath == '/') {
 			++filepath;
 		}
 	}
 	return filepath;
-}
+ }