From 612d65d57f5287094f363b77df9f90eb645eb266 Mon Sep 17 00:00:00 2001
From: hachem <im@hachem.wtf>
Date: Sat, 19 Sep 2026 22:30:59 +0200
Subject: feat: add version/help

---
 Makefile | 10 +++++++++-
 README   |  2 ++
 main.c   | 41 ++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 97a3646..fb7a0d8 100644
--- a/Makefile
+++ b/Makefile
@@ -5,8 +5,9 @@ CFLAGS  = -std=c17 -Wall -Wextra -Werror -Wpedantic -O2 -Ibin
 SOURCES = ast.c ast.h eval.c eval.h lexer.h main.c
 OBJECTS = bin/lexer.o bin/parser.o bin/ast.o bin/eval.o bin/main.o
 SANITIZE = -g -O0 -fsanitize=address,undefined
+PREFIX ?= /usr/local
 
-.PHONY: all debug check format lint clean
+.PHONY: all debug check format lint install uninstall clean
 
 all: sfinae
 
@@ -50,5 +51,12 @@ format:
 lint:
 	clang-tidy ast.c eval.c main.c -- -std=c17 -Ibin
 
+install: sfinae
+	install -d $(DESTDIR)$(PREFIX)/bin
+	install -m 755 sfinae $(DESTDIR)$(PREFIX)/bin/sfinae
+
+uninstall:
+	rm -f $(DESTDIR)$(PREFIX)/bin/sfinae
+
 clean:
 	rm -rf bin sfinae
diff --git a/README b/README
index 32e77c7..eea77c0 100644
--- a/README
+++ b/README
@@ -11,6 +11,8 @@ a toy language which takes' C++ template metaprogramming to another level.
     make format     clang-format the sources
     make lint       clang-tidy naming check
     make clean
+    make install    copy ./sfinae to PREFIX/bin, PREFIX defaults to /usr/local
+    make uninstall
 
 ## run
 
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)
     {
-- 
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