Moved UI methods to their own struct

internal/ui/dialogs.go

@@ -0,0 +1,30 @@
+package ui
+
+import "github.com/ncruces/zenity"
+
+func (u *UI) OpenDirectory(id, title string) string {
+	if title == "" {
+		title = "Choose a directory"
+	}
+
+	dir, err := zenity.SelectFile(zenity.Title(title), zenity.Directory())
+
+	if err != nil && err != zenity.ErrCanceled {
+		zenity.Error("Error while opening directory", zenity.ErrorIcon)
+	}
+
+	return dir
+}
+
+func (u *UI) EnterText(title, info, defaultEntry string) string {
+	input, err := zenity.Entry(info, zenity.Title(title), zenity.EntryText(defaultEntry))
+
+	if err == zenity.ErrCanceled {
+		return ""
+	} else if err != nil {
+		zenity.Error(err.Error(), zenity.Title("Encountered an error!"), zenity.ErrorIcon)
+		return ""
+	} else {
+		return input
+	}
+}