feat: add simple logging library

include/cli.h

@@ -3,23 +3,25 @@
 #include <stdio.h>
 #include "optional.h"
 
-struct cli_options {
+typedef struct {
     optional_str file;
     int verbosity;
     bool help;
     bool version;
-};
+    bool use_colors;
+    optional_str log_file;
+} cli_options;
 
 // Construct a new cli_options struct instance.
-struct cli_options new_options();
+cli_options new_options();
 
 // Delete a cli_options struct instance.
-void free_options(struct cli_options v);
+void free_options(cli_options v);
 
 // Print the help message.
 void print_help(FILE * out, char* prog_name);
 
 // Parse the command line arguments and give a new cli_options struct instance.
-struct cli_options parse(int argc, char** argv);
+cli_options parse(int argc, char** argv);
 
 #endif