Add support for more option types to Go conf file parsing

tools/config/utils_test.go

@@ -0,0 +1,26 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package config
+
+import (
+	"fmt"
+	"testing"
+)
+
+var _ = fmt.Print
+
+func TestStringLiteralParsing(t *testing.T) {
+	for q, expected := range map[string]string{
+		`abc`:                    `abc`,
+		`a\nb\M`:                 "a\nb\\M",
+		`a\x20\x1\u1234\123\12|`: "a \\x1\u1234\123\x0a|",
+	} {
+		actual, err := StringLiteral(q)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if expected != actual {
+			t.Fatalf("Failed with input: %#v\n%#v != %#v", q, expected, actual)
+		}
+	}
+}