Shrink the logger

* Move _write function to the log.c
* Change the way to setup the logger
* Update the readme
* Add terminal commands

README.md

@@ -52,38 +52,56 @@ You can control the verbosity of the logging output by setting a global log leve
 This log level filters out messages with a lower priority.
 
 ### Custom Log Levels
-Additionally, you have the flexibility to override the log level for individual tags (but not lower than the global log level).
-This can be archived by calling the following function:
+before you include `log.h`, you can define custom log levels by defining the following macros:
 ```c
-logger_set_log_level(LOG_TAG, LOG_LEVEL);
+// All log messages will be printed
+#define LOGGER_LEVEL_ALL
+#include "log.h"
+```
+
+```c
+// Info and higher priority messages will be printed
+#define LOGGER_LEVEL_INFO
+#include "log.h"
+```
+
+```c
+// Only warnings and errors will be printed
+#define LOGGER_LEVEL_WARN
+#include "log.h"
+```
+
+```c
+// Only log messages with level ERROR will be printed
+#define LOGGER_LEVEL_ERROR
+#include "log.h"
 ```
-If the log level for a tag is not set, the global log level is used.
 
 ### Colorful Log Messages
-For improved readability, log messages can be printed in color by configuring `LOGGER_USE_COLOR` to `1` in `log.h`.
+For improved readability, log messages can be printed in color by configuring `LOGGER_USE_COLOR` to `1` in `log.h` or before you include `log.h`. \
+Default is `0`
 
 ### Log Output Format
 Each log entry is formatted to include the following information:
 
- - Log level (D for Debug, I for Info, W for Warning, E for Error)
+ - Log level ([Debug], [Info], [Warn], [Error])
  - Timestamp (in milliseconds since boot)
  - Tag
  - The log message
 
 For instance, a log entry may look like this:
 
-`I (2009) LTDC: This is a log message`
+`[Info] (2009) [LTDC]: This is a log message`
 
 ### Example
 ```c
+#define LOGGER_LEVEL_INFO
 #include "log.h"
 
 // Don't use a define for the tag, as the pointer to the tag is used
 static const char *TAG = "main";
 
 int main(void) {
-    // Set log level for tag "main" to LOG_LEVEL_INFO
-    logger_set_log_level(TAG, LOG_LEVEL_INFO);
     
     LOG_DEBUG(TAG, "This message will not be printed");
     LOG_INFO(TAG, "This message will be printed");
@@ -99,10 +117,10 @@ int main(void) {
 ```
 Result:
 ```
-I (2009) main: This message will be printed
-W (2026) main: This message will be printed
-E (2033) main: This message will be printed
-I (2040) main: Iteration 0 of 3
-I (2047) main: Iteration 1 of 3
-I (2054) main: Iteration 2 of 3
+[Info]    (2009) main: This message will be printed
+[Warning] (2026) main: This message will be printed
+[Error]   (2033) main: This message will be printed
+[Info]    (2040) main: Iteration 0 of 3
+[Info]    (2047) main: Iteration 1 of 3
+[Info]    (2054) main: Iteration 2 of 3
 ```