manual c function interop

main.odin

@@ -1,15 +1,75 @@
 package main
 
 import "./compiler"
+import "./compiler/linker"
 import "core:fmt"
 import "core:os/os2"
 
+Cli_Options :: struct {
+	input_path:     string,
+	output_path:    string,
+	link_arguments: []linker.Argument,
+}
+
+parse_cli_args :: proc(args: []string, allocator := context.allocator) -> (Cli_Options, bool) {
+	if len(args) < 4 {
+		return {}, false
+	}
+	options := Cli_Options{input_path=args[1]}
+	link_arguments: [dynamic]linker.Argument
+	link_arguments.allocator = allocator
+	output_set := false
+	cursor := 2
+	for cursor < len(args) {
+		option := args[cursor]
+		cursor += 1
+		if cursor >= len(args) {
+			delete(link_arguments)
+			return {}, false
+		}
+		value := args[cursor]
+		cursor += 1
+		switch option {
+		case "-o":
+			if output_set {
+				delete(link_arguments)
+				return {}, false
+			}
+			output_set = true
+			options.output_path = value
+		case "--link":
+			append(&link_arguments, linker.Argument{kind=.Input, value=value})
+		case "--library-path":
+			append(&link_arguments, linker.Argument{kind=.Library_Path, value=value})
+		case "--library":
+			append(&link_arguments, linker.Argument{kind=.Library, value=value})
+		case:
+			delete(link_arguments)
+			return {}, false
+		}
+	}
+	if !output_set || len(options.output_path) == 0 {
+		delete(link_arguments)
+		return {}, false
+	}
+	options.link_arguments = link_arguments[:]
+	return options, true
+}
+
+print_usage :: proc() {
+	fmt.eprintln(
+		"usage: brolang <package-directory> -o <executable> [--link <path> | --library-path <dir> | --library <name>]...",
+	)
+}
+
 main :: proc() {
-	if len(os2.args) != 4 || os2.args[2] != "-o" {
-		fmt.eprintln("usage: brolang <package-directory> -o <executable>")
+	options, valid := parse_cli_args(os2.args)
+	if !valid {
+		print_usage()
 		os2.exit(2)
 	}
-	status := compiler.compile_package(os2.args[1], os2.args[3])
+	defer delete(options.link_arguments)
+	status := compiler.compile_package(options.input_path, options.output_path, options.link_arguments)
 	if status != 0 {
 		os2.exit(status)
 	}