1 files changed, 20 insertions, 0 deletions
diff --git a/lib/prompts.js b/lib/prompts.js
index ac21c49..8f7942e 100644
--- a/lib/prompts.js
+++ b/lib/prompts.js
@@ -80,3 +80,23 @@ exports.promptYesNoCancel = function promptOKNoCancel(prompt) {
         return null;
     }
 };
+
+/**
+ *
+ * documentation is https://developer.mozilla.org/en/NsIFilePicker
+ */
+exports.promptFileOpenPicker = function promptFilePicker (win) {
+    var fp = Cc["@mozilla.org/filepicker;1"]
+        .createInstance(Ci.nsIFilePicker);
+    fp.init(win, "JSON File Open", Ci.nsIFilePicker.modeOpen);
+    fp.appendFilter("JSON files", "*.json");
+    fp.appendFilters(Ci.nsIFilePicker.filterAll);
+    fp.filterIndex = 0;
+    var res = fp.show();
+
+    if (res === Ci.nsIFilePicker.returnOK ||
+        res === Ci.nsIFilePicker.returnReplace ) {
+            return fp.file.path
+    }
+    return null;
+};
+\ No newline at end of file