1 files changed, 40 insertions, 1 deletions

diff --git a/main.c b/main.c
index db2c879..a3d1caa 100644
--- a/main.c
+++ b/main.c
@@ -1,9 +1,13 @@
+#include <stdbool.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "ast.h"
 #include "eval.h"
 #include "lexer.h"
 
+#define VERSION "0.1.0"
+
 extern struct Node* program_root;
 int yyparse(void);
 
@@ -24,14 +28,49 @@ static int run_program(void)
     return status;
 }
 
+static void print_usage(FILE* stream)
+{
+    (void)fprintf(stream,
+                  "usage: sfinae <file.sfinae>\n"
+                  "       sfinae [-v | -h]\n");
+}
+
+static void print_help(void)
+{
+    (void)printf("sfinae " VERSION " - substitution failure is not an error\n\n"
+                 "a toy language inspired by c++ template meta programming\n\n");
+    print_usage(stdout);
+    (void)printf("\noptions:\n"
+                 "  -v, --version    print version\n"
+                 "  -h, --help       print this\n\n"
+                 "by hachem <im@hachem.wtf>\n");
+}
+
+static bool is_flag(const char* argument, const char* brief, const char* full)
+{
+    return strcmp(argument, brief) == 0 || strcmp(argument, full) == 0;
+}
+
 int main(int argc, char** argv)
 {
     if (argc != 2)
     {
-        (void)fprintf(stderr, "usage: sfinae <file.sfinae>\n");
+        print_usage(stderr);
         return 2;
     }
 
+    if (is_flag(argv[1], "-h", "--help"))
+    {
+        print_help();
+        return 0;
+    }
+
+    if (is_flag(argv[1], "-v", "--version"))
+    {
+        (void)printf("sfinae " VERSION "\n");
+        return 0;
+    }
+
     yyin = fopen(argv[1], "r");
     if (yyin == NULL)
     {