add fix-rdf-file.go

- It does the same as fix-rdf-file.py

- I was hoping that it would be faster, but it's actually
  slower. I do use regex in the Python version so that's probably
  it. For what it's worth, this confirms that the weird regular
  expressoin in the Python version is actually correct.

ulo/fix-rdf-file.go

+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// characters that we want to escape
+var BadChars = []string{
+	"|", "\\", " ", "^", "<", ">",
+}
+
+// what we want to escape BadChars to; EscapedChars[i] should
+// containt he escaped version of BadChars[i]
+var EscapedChars = []string{}
+
+func init() {
+	// initialize EscapedChars
+
+	for _, bc := range BadChars {
+		escaped := fmt.Sprintf("%%%X", bc)
+		EscapedChars = append(EscapedChars, escaped)
+	}
+}
+
+func Fix(r rune) (fixed string) {
+	fixed = fmt.Sprintf("%c", r)
+
+	for i, bad := range BadChars {
+		escaped := EscapedChars[i]
+		fixed = strings.ReplaceAll(fixed, bad, escaped)
+	}
+
+	return fixed
+}
+
+func PrintFixed(line string) {
+	insideQuoted := false
+
+	out := strings.Builder{}
+
+	for _, r := range line {
+		if r == '"' {
+			insideQuoted = !insideQuoted
+		}
+
+		if insideQuoted {
+			fixed := Fix(r)
+			out.WriteString(fixed)
+		} else {
+			out.WriteRune(r)
+		}
+	}
+
+	fmt.Print(out.String())
+}
+
+func main() {
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		PrintFixed(scanner.Text())
+		PrintFixed("\n")
+	}
+}