Use --baseURL path for live-reload URL

Fixes #6595

transform/livereloadinject/livereloadinject.go

@@ -16,6 +16,9 @@ package livereloadinject
 import (
 	"bytes"
 	"fmt"
+	"html"
+	"net/url"
+	"strings"
 
 	"github.com/gohugoio/hugo/helpers"
 	"github.com/gohugoio/hugo/transform"
@@ -35,7 +38,8 @@ var tags = []tag{
 
 // New creates a function that can be used
 // to inject a script tag for the livereload JavaScript in a HTML document.
-func New(port int) transform.Transformer {
+func New(baseURL url.URL) transform.Transformer {
+
 	return func(ft transform.FromTo) error {
 		b := ft.From().Bytes()
 		var idx = -1
@@ -51,6 +55,12 @@ func New(port int) transform.Transformer {
 			}
 		}
 
+		path := strings.TrimSuffix(baseURL.Path, "/")
+
+		src := path + "/livereload.js?mindelay=10&v=2"
+		src += "&port=" + baseURL.Port()
+		src += "&path=" + strings.TrimPrefix(path+"/livereload", "/")
+
 		c := make([]byte, len(b))
 		copy(c, b)
 
@@ -59,7 +69,7 @@ func New(port int) transform.Transformer {
 			return err
 		}
 
-		script := []byte(fmt.Sprintf(`<script src="/livereload.js?port=%d&amp;mindelay=10&amp;v=2" data-no-instant defer></script>`, port))
+		script := []byte(fmt.Sprintf(`<script src="%s" data-no-instant defer></script>`, html.EscapeString(src)))
 
 		i := idx
 		if match.appendScript {

transform/livereloadinject/livereloadinject_test.go

@@ -15,6 +15,7 @@ package livereloadinject
 
 import (
 	"bytes"
+	"net/url"
 	"strings"
 	"testing"
 
@@ -25,12 +26,17 @@ import (
 func TestLiveReloadInject(t *testing.T) {
 	c := qt.New(t)
 
-	expectBase := `<script src="/livereload.js?port=1313&amp;mindelay=10&amp;v=2" data-no-instant defer></script>`
+	lrurl, err := url.Parse("http://localhost:1234/subpath")
+	if err != nil {
+		t.Errorf("Parsing test URL failed")
+		return
+	}
+	expectBase := `<script src="/subpath/livereload.js?mindelay=10&amp;v=2&amp;port=1234&amp;path=subpath/livereload" data-no-instant defer></script>`
 	apply := func(s string) string {
 		out := new(bytes.Buffer)
 		in := strings.NewReader(s)
 
-		tr := transform.New(New(1313))
+		tr := transform.New(New(*lrurl))
 		tr.Apply(out, in)
 
 		return out.String()