cli header only library

cli.h

@@ -0,0 +1,88 @@
+#ifndef CLI_HEADER
+#define CLI_HEADER
+
+#include <stdbool.h>
+
+typedef struct args {
+    int count;
+    char **values;
+} args_t;
+
+args_t make_args(int arg_count, char **args);
+bool command(args_t *args, char *command_name);
+bool parse_bool(args_t args, char *flag_name);
+char *parse_string(args_t args, char *flag_name);
+int parse_int(args_t args, char *flag_name);
+
+
+#ifdef CLI_IMPL
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+bool command(args_t *args, char *command_name) {
+    if (args->count == 0) {
+        return false;
+    }
+    if (strcmp(args->values[0], command_name) == 0) {
+        args->values++;
+        args->count--;
+        return true;
+    }
+    return false;
+}
+
+bool parse_bool(args_t args, char *flag_name) {
+    for ( int i = 0; i < args.count; i++ ) {
+        if (strcmp(args.values[i], flag_name) == 0) {
+            return true;
+        }
+    }
+    return false;
+}
+
+char *parse_string(args_t args, char *flag_name) {
+    bool is_found = false;
+    int flag_name_index;
+    for ( int i = 0; i < args.count; i++ ) {
+        if (strcmp(args.values[i], flag_name) == 0) {
+            is_found = true;
+            flag_name_index = i;
+            break;
+        }
+    }
+    if (!is_found) {
+        fprintf(stderr, "Arg %s not found!\n", flag_name);
+        exit(1);
+    }
+    int flag_value_index = flag_name_index + 1;
+    if (flag_value_index >= args.count) {
+        fprintf(stderr, "No value provided for %s!\n", flag_name);
+        exit(1);
+    }
+    return args.values[flag_value_index];
+}
+
+int parse_int(args_t args, char *flag_name) {
+    char *text = parse_string(args, flag_name);
+    for ( char *c = text; (*c) != '\0'; c++ ) {
+        if ((*c) < '0' || '9' < (*c)) {
+            fprintf(stderr, "Invalid integer %s!\n", text);
+            exit(1);
+        }
+    }
+    int result = atoi(text);
+    return result;
+}
+
+args_t make_args(int arg_count, char **args) {
+    return (args_t) {
+        .count = arg_count-1,
+        .values = args+1,
+    };
+}
+
+#endif /* CLI_IMPL */
+#endif /* CLI_HEADER */