initial commit

+ Lots of code copied from ek, so didn't have to start from scratch, but
  might mean there are some quirks here and there that made sense in ek
  but not necessarily here.

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);
+}