parser: allow Ctrl+Backspace

Author: alexwforsythe

command.go

@@ -169,6 +169,8 @@ func ExecuteCtrl(c Command, v *VHS) {
 			inputKey = &input.Enter
 		case "Space":
 			inputKey = &input.Space
+		case "Backspace":
+			inputKey = &input.Backspace
 		default:
 			r := rune(key[0])
 			if k, ok := keymap[r]; ok {

parser.go

@@ -172,6 +172,7 @@ func (p *Parser) parseCtrl() Command {
 		switch {
 		case peek.Type == ENTER,
 			peek.Type == SPACE,
+			peek.Type == BACKSPACE,
 			peek.Type == STRING && len(peek.Literal) == 1:
 			args = append(args, peek.Literal)
 		default:

parser_test.go

@@ -234,9 +234,10 @@ func TestParseCtrl(t *testing.T) {
 			wantErr: true,
 		},
 		{
-			name:    "Ctrl+Backspace",
-			tape:    "Ctrl+Backspace",
-			wantErr: true,
+			name:     "Ctrl+Backspace",
+			tape:     "Ctrl+Backspace",
+			wantArgs: []string{"Backspace"},
+			wantErr:  false,
 		},
 		{
 			name:     "Ctrl+Space",