cmd: add func to extract value from arg

issue #2

src/cdo.c

@@ -13,8 +13,7 @@ static void __attribute__((constructor)) init_cdo(void) {
 
 int main (int argc, char *argv[]) {
   struct ArgList* args = parse_args(argc, argv);
-  for (size_t i = 0; i < args->size; i++) {
-    printf("Arg: %s, param: %s\n", args->args[i].name, args->args[i].value);
-  }
+  const char* project_path = extract_value_from_arg(args, ARG_PROJECT);
+  LOG_INFO("Project full path: %s", project_path);
   return 0;
 }

src/cmd.c

@@ -133,6 +133,15 @@ void append_arg(struct ArgList* list, struct CommandLineArg* arg) {
     list->size += 1;
 }
 
+const char* extract_value_from_arg(struct ArgList* list, ArgNameId id) {
+    for (size_t i = 0; i < ARG_COUNT; i++) {
+        if (list->args[i].id == id) {
+            return list->args[i].value;
+        }
+    }
+    return NULL;
+}
+
 void free_arg_list(struct ArgList* list) {
     for (size_t i = 0; i < ARG_COUNT; i++) {
         cdo_free(list->args[i].name);

src/cmd.h

@@ -32,6 +32,7 @@ void init_cmd(void);
 void exit_cmd(void);
 struct ArgList* create_arg_list(size_t capacity);
 void append_arg(struct ArgList* list, struct CommandLineArg* arg);
+const char* extract_value_from_arg(struct ArgList* list, ArgNameId id);
 void free_arg_list(struct ArgList* list);
 void usage(void);
 #endif /*__CMD_H__*/