Initial project import

tools/v/vlib/log/common.v

@@ -0,0 +1,95 @@
+module log
+
+import term
+
+// Level defines the possible log levels, used by Log.set_level()
+pub enum Level {
+	disabled = 0   // lowest level, disables everything else
+	fatal // disables error, warn, info and debug
+	error // disables warn, info and debug
+	warn  // disables info and debug
+	info  // disables debug
+	debug
+}
+
+// LogTarget defines the possible log targets, that Log supports
+pub enum LogTarget {
+	console
+	file
+	both
+}
+
+// tag_to_console returns the tag for log level `l` as a colored string.
+@[noinline]
+fn tag_to_console(l Level, short_tag bool) string {
+	if short_tag {
+		return match l {
+			.disabled { ' ' }
+			.fatal { term.red('F') }
+			.error { term.red('E') }
+			.warn { term.yellow('W') }
+			.info { term.white('I') }
+			.debug { term.magenta('D') }
+		}
+	} else {
+		return match l {
+			.disabled { '' }
+			.fatal { term.red('FATAL') }
+			.error { term.red('ERROR') }
+			.warn { term.yellow('WARN ') }
+			.info { term.white('INFO ') }
+			.debug { term.magenta('DEBUG') }
+		}
+	}
+}
+
+// tag_to_file returns the tag for log level `l` as a string.
+@[noinline]
+fn tag_to_file(l Level, short_tag bool) string {
+	if short_tag {
+		return match l {
+			.disabled { ' ' }
+			.fatal { 'F' }
+			.error { 'E' }
+			.warn { 'W' }
+			.info { 'I' }
+			.debug { 'D' }
+		}
+	} else {
+		return match l {
+			.disabled { '     ' }
+			.fatal { 'FATAL' }
+			.error { 'ERROR' }
+			.warn { 'WARN ' }
+			.info { 'INFO ' }
+			.debug { 'DEBUG' }
+		}
+	}
+}
+
+// level_from_tag returns the log level from the given string.
+// It returns `none` when it does not find a match.
+@[noinline]
+pub fn level_from_tag(tag string) ?Level {
+	return match tag {
+		'DISABLED', ' ' { Level.disabled }
+		'FATAL', 'F' { Level.fatal }
+		'ERROR', 'E' { Level.error }
+		'WARN', 'W' { Level.warn }
+		'INFO', 'I' { Level.info }
+		'DEBUG', 'D' { Level.debug }
+		else { none }
+	}
+}
+
+// target_from_label returns the log target from the given string.
+// It returns `none` when it does not find a match.
+@[noinline]
+pub fn target_from_label(label string) ?LogTarget {
+	return match label {
+		'console' { LogTarget.console }
+		'file' { LogTarget.file }
+		'both' { LogTarget.both }
+		else { none }
+	}
+}