feat: add -n flag (closes #47)

main.go

@@ -35,6 +35,7 @@ var (
 	hooks bait.Bait
 	interactive bool
 	login bool // Are we the login shell?
+	noexecute bool // Should we run Lua or only report syntax errors
 )
 
 func main() {
@@ -51,10 +52,12 @@ func main() {
 	// TODO: issue #37
 	_ = getopt.BoolLong("login", 'l', "Makes Hilbish act like a login shell")
 	_ = getopt.BoolLong("interactive", 'i', "Force Hilbish to be an interactive shell")
+	_ = getopt.BoolLong("noexec", 'n', "Force Hilbish to be an interactive shell")
 
 	getopt.Parse()
 	loginshflag := getopt.Lookup('l').Seen()
 	interactiveflag := getopt.Lookup('i').Seen()
+	noexecflag := getopt.Lookup('n').Seen()
 
 	if *cmdflag == "" || interactiveflag {
 		interactive = true
@@ -64,6 +67,10 @@ func main() {
 		interactive = false
 	}
 
+	if noexecflag {
+		noexecute = true
+	}
+
 	// first arg, first character
 	if loginshflag || os.Args[0][0] == '-' {
 		login = true

shell.go

@@ -16,9 +16,17 @@ import (
 )
 
 func RunInput(input string) {
-	// First try to run user input in Lua
-	err := l.DoString(input)
-
+	// First try to load input, essentially compiling to bytecode
+	fn, err := l.LoadString(input)
+	if err != nil && noexecute {
+		fmt.Println(err)
+		return
+	}
+	// And if there's no syntax errors and -n isnt provided, run
+	if !noexecute {
+		l.Push(fn)
+		err = l.PCall(0, lua.MultRet, nil)
+	}
 	if err == nil {
 		// If it succeeds, add to history and prompt again
 		HandleHistory(input)