add log file functionality

LLog.c

@@ -27,6 +27,30 @@ int lLogString_array_append(lLogString_array* array, lLogString* string) {
     return array->count - 1;
 }
 
+Logger* Logger_new(lLogString* logfolder, int history_enabled) {
+    Logger* logger = calloc(1, sizeof(Logger));
+    logger->historyEnabled = history_enabled;
+    logger->logFileEnabled = 1;
+    
+    time_t time_now = time(NULL);
+    char file_name[64];
+    
+    strftime(file_name, sizeof(file_name), "%Y-%m-%d--%H:%M:%S.log", localtime(&time_now));
+
+    lLogString* logFile = lLogString_new("%.*s/%s", (int)logfolder->len, logfolder->buf, file_name);
+    logger->log_file = fopen(logFile->buf, "a");
+    
+    if (logger->log_file == NULL) {
+        logger->logFileEnabled = 0;
+        lLog(logger, 
+            lERROR, 
+            lLogString_new("Could not open log file: \"%.*s\" Continuing without log file.", (int)logFile->len, logFile->buf)
+        );
+    }
+
+    return logger;
+}
+
 int create_timer(Logger* logger) {
     return timer_array_append(&logger->timers, (lTimer){});
 }
@@ -61,13 +85,23 @@ lLogString* lLogString_new(const char* fmt, ...) {
     return str;
 };
 
+int Logger_write_to_log(Logger* logger, lLogString* string) {
+    if (logger->logFileEnabled == 0 || logger->log_file == NULL) return 1;
+    fprintf(logger->log_file, "%.*s", (int)string->len, string->buf);
+    
+    return 0;
+}
+
 int lLog(Logger* logger, enum lLogLevel LOG_LEVEL, lLogString* MESSAGE) {
     char* LOG_LEVEL_STRING = LOG_LEVEL == 0 ? "INFO" :
                              LOG_LEVEL == 1 ? "WARNING" :
                              LOG_LEVEL == 2 ? "ERROR" :
                              LOG_LEVEL == 3 ? "DEBUG" :
                              "invalid_log_level";
-
-    printf("[%s]: %.*s\n", LOG_LEVEL_STRING, (int)MESSAGE->len, MESSAGE->buf);
-    return lLogString_array_append(&logger->history, MESSAGE);
+    lLogString* formated_message = lLogString_new("[%s]: %.*s\n", LOG_LEVEL_STRING, (int)MESSAGE->len, MESSAGE->buf);
+    
+    if (logger->logFileEnabled) Logger_write_to_log(logger, formated_message);
+    printf("%.*s", (int)formated_message->len, formated_message->buf);
+    
+    return lLogString_array_append(&logger->history, formated_message);
 }