// diffHandler returns an http.HandlerFunc that serves the diff of the
// two given files.
func diffHandler(filename1, filename2 string) http.HandlerFunc {
diff := difflib.HTMLDiff(fileToLines(filename1), fileToLines(filename2))
tmpl, _ := template.New("diffTemplate").Parse(templateString)
return func(w http.ResponseWriter, r *http.Request) {
err := tmpl.Execute(w, map[string]interface{}{
"Diff": template.HTML(diff),
"Filename1": filename1,
"Filename2": filename2,
})
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
}
}
func (store *scrapeStore) htmlDiffPrev() (string, error) {
if store.prev() != nil {
return "<table>" + difflib.HTMLDiff(bytesToStringsOnNewline(store.prev()), bytesToStringsOnNewline(store.current())) + "</html>", nil
}
return "", fmt.Errorf("Can't generate diff with only one scrape.")
}