lmc/main.go

package main

import (
	"fmt"
	"os"
)

func main() {
	if len(os.Args) != 2 {
		fmt.Printf("usage: %s file\n", os.Args[0])
	} else if file, err := os.Open(os.Args[1]); err != nil {
		fmt.Printf("Cannot open file: %s\n", err)
	} else if code, err := Assemble(file); err != nil {
		fmt.Printf("Assembly failed: %s\n", err)
	} else if err = Run(code); err != nil {
		fmt.Printf("Runtime error: %s\n", err)
	} else {
		os.Exit(0)
	}
	os.Exit(1)
}