1 files changed, 75 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..204a920
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: copyleft-next-0.3.1 */
+/* Copyright 2024 Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
+
+/**
+ * @file main.c
+ *
+ * Compiler main file, controls compilation and command line
+ * handling.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <fwd/debug.h>
+#include <fwd/compiler.h>
+
+/**
+ * String describing compiler usage.
+ * @todo I suspect backends might want more flags, come up with
+ * some way to make flag handling more generic
+ */
+static const char *cmdline_usage =
+	"fwd frontend usage:\n"
+	" fwd infile\n"
+	"	-h            Show usage (this)\n"
+	"	infile        Top file(s) to compile\n"
+;
+
+/** Print usage of compiler. */
+static void usage()
+{
+	fputs(cmdline_usage, stderr);
+}
+
+/**
+ * Main entry to compiler.
+ * Checks command line parameters and drives the rest of the compiler.
+ * Feels kind of weird documenting main, but doxygen warns about not
+ * doing it so whatever.
+ *
+ * @param argc Number of command line arguments.
+ * @param argv Array of command line arguments.
+ * @return \c 0 when succesful, non-zero otherwise.
+ */
+int main(int argc, char *argv[])
+{
+	int opt;
+	while ((opt = getopt(argc, argv, "hI:")) != -1) {
+		switch (opt) {
+		case 'h':
+			usage();
+			exit(EXIT_SUCCESS);
+
+		default:
+			usage();
+			exit(EXIT_FAILURE);
+		}
+	}
+
+	if (optind >= argc) {
+		error("no input file");
+		usage();
+		exit(EXIT_FAILURE);
+	}
+
+	if (optind != argc - 1) {
+		error("too many arguments");
+		usage();
+		exit(EXIT_FAILURE);
+	}
+
+	const char *input = argv[optind];
+	return compile(input);
+}