Work on porting config file parsing to Go

tools/utils/config.go

@@ -0,0 +1,32 @@
+// License: GPLv3 Copyright: 2023, Kovid Goyal, <kovid at kovidgoyal.net>
+
+package utils
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"strings"
+)
+
+var _ = fmt.Print
+
+func StringToBool(x string) bool {
+	x = strings.ToLower(x)
+	return x == "y" || x == "yes" || x == "true"
+}
+
+func ParseConfData(src io.Reader, callback func(key, val string, line int)) error {
+	scanner := bufio.NewScanner(src)
+	lnum := 0
+	for scanner.Scan() {
+		line := strings.TrimLeft(scanner.Text(), " ")
+		lnum++
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		key, val, _ := strings.Cut(line, " ")
+		callback(key, val, lnum)
+	}
+	return scanner.Err()
+}