all: include the path that cause an error on newHTMLGenerator

In case the newHTMLGenerator return an error, it's hard to track which
part of code that cause the error because there are three files being
processed (the index HTML, HTML template, or internal template).

This changes include the file that cause an error inside the error
message.

1 files changed, 5 insertions, 5 deletions

diff --git a/htmlgenerator.go b/htmlgenerator.go
index 9f65f5f..9275067 100644
--- a/htmlgenerator.go
+++ b/htmlgenerator.go
@@ -35,25 +35,25 @@ func newHTMLGenerator(mfs *memfs.MemFS, htmlTemplate string, devel bool) (
 	if len(htmlTemplate) == 0 {
 		htmlg.tmpl, err = htmlg.tmpl.Parse(templateIndexHTML)
 		if err != nil {
-			return nil, fmt.Errorf("%s: %w", logp, err)
+			return nil, fmt.Errorf("%s: %s: %w", logp, templateIndexHTML, err)
 		}
 	} else if mfs == nil || devel {
 		htmlg.htmlTemplate = filepath.Clean(htmlTemplate)
 
 		bhtml, err := ioutil.ReadFile(htmlg.htmlTemplate)
 		if err != nil {
-			return nil, fmt.Errorf("%s: %w", logp, err)
+			return nil, fmt.Errorf("%s: %s: %w", logp, htmlg.htmlTemplate, err)
 		}
 
 		htmlg.tmpl, err = htmlg.tmpl.Parse(string(bhtml))
 		if err != nil {
-			return nil, fmt.Errorf("%s: %s", logp, err)
+			return nil, fmt.Errorf("%s: Parse: %s", logp, err)
 		}
 	} else {
 		// Load HTML template from memory file system.
 		tmplNode, err := mfs.Get(internalTemplatePath)
 		if err != nil {
-			return nil, fmt.Errorf("%s: %w", logp, err)
+			return nil, fmt.Errorf("%s: %s: %w", logp, internalTemplatePath, err)
 		}
 
 		htmlg.tmpl, err = htmlg.tmpl.Parse(string(tmplNode.Content))
@@ -65,7 +65,7 @@ func newHTMLGenerator(mfs *memfs.MemFS, htmlTemplate string, devel bool) (
 	htmlg.tmplSearch = template.New("search")
 	htmlg.tmplSearch, err = htmlg.tmplSearch.Parse(templateSearch)
 	if err != nil {
-		return nil, fmt.Errorf("%s: %w", logp, err)
+		return nil, fmt.Errorf("%s: %s: %w", logp, templateSearch, err)
 	}
 
 	return htmlg, nil