Better example

README.md

@@ -6,21 +6,41 @@ import (
 	werr "git.gibonuddevalla.se/go/wrappederror"
 
 	// Standard
+	"encoding/json"
 	"errors"
 	"fmt"
+	"os"
 )
 
 func errorHandler(err werr.Error) {
 	// For example print or log error to file
-    fmt.Printf("ERROR - %s\n", err)
+	fmt.Printf("\x1b[31;1m%s\x1b[0m\n", err)
+	fmt.Printf("\x1b[33;1m%s\x1b[0m\n", err.NoTrace())
+
+	j, _ := json.MarshalIndent(err, "", "    ")
+	fmt.Printf("%s\n\n", j)
 }
 
-func foo() {
+func main() {
+	// Make file paths relative to this file.
+	werr.Init()
+
+	// Handler to call when using Log().
 	werr.SetLogCallback(errorHandler)
 
+	// Wrap an existing error.
 	err := errors.New("foobar 1")
 	err1 := werr.Wrap(err)
 
-    err2 := werr.New("foobar 2")
+	// Create a new error with extra information.
+	err2 := werr.New("foobar 2").WithCode("FOO-100").WithData(137)
+
+	// The os error contains more information.
+	_, errOS := os.ReadFile("/tmp/does_not_exist")
+	werr.Wrap(errOS).Log()
+
+	// Log the previously wrapped errors.
+	werr.Wrap(err1).Log()
+	werr.Wrap(err2).Log()
 }
 ```