intrusively report failure to save pad

src/kiss_web_pad/Background_.kiss

@@ -7,11 +7,11 @@
 
 // REMEMBER THAT CONSOLE OUTPUT GOES TO A SEPARATE BACKGROUND CONSOLE.
 (API.browser.browserAction.onClicked.addListener ->:Void [tab info] {
-    (WebPad.find tab.url ->[:Dynamic pad] (sendMessage (Std.int tab.id) "openPad" [pad]))
+    (WebPad.find tab.url ->[:Dynamic pad] (sendMessage (Std.int tab.id) "openPad" [pad (Std.int tab.id)]))
 })
 
-(onMessage "savePad" [pad]
-	(WebPad.save ~pad))
+(onMessage "savePad" [pad tabId]
+	(WebPad.save pad ->:Void [type data] (sendMessage tabId type data)))
 
 (onMessage "downloadTxtFile" [filename contents]
 	(let [file (new File [contents] filename)

src/kiss_web_pad/Main_.kiss

@@ -6,9 +6,11 @@
 (var &mut showing false)
 
 
+(onMessage "alert" [message]
+	(window.alert message))
 
 // on message from the button action, open the web pad
-(onMessage "openPad" [pad]
+(onMessage "openPad" [pad tabId]
 	(unless div
 		(set div (document.createElement "div"))
 		(set div.style "position: absolute; top: 0; z-index:999999999; background: #555;")
@@ -34,11 +36,14 @@
 					value pad.content
 					language "lisp")))
 			(.addEventListener ($elem "saveBtn") "click"
-				->e (sendMessage "savePad" [(object
+				->e (sendMessage "savePad" [
+											(object
 												id pad.id
 												urlPattern .value ($elem "pattern")
 												language .value ($elem "lang")
-												content (editor.getValue))]))
+												content (editor.getValue))
+											tabId
+										   ]))
 			(.addEventListener ($elem "launchBtn") "click"
 				->e (let [interp (new KissWebPadInterp)]
 						(dictSet interp.globals "document" document)

src/kiss_web_pad/WebPad.kiss

@@ -17,9 +17,11 @@ The WebPad contains an array of element objects:
     `(awaitLet [_padObj (API.browser.storage.sync.get (object webPad (new Array<Dynamic>)))
                     &sync :Array<Dynamic> ,padSymbol (dictGet _padObj "webPad")]
         ,@body
-        (if ,change
-                (API.browser.storage.sync.set (object webPad ,padSymbol))
-            null)))
+        ,(if (eval change)
+				`(awaitLet [_ (API.browser.storage.sync.set (object webPad ,padSymbol))]
+					(catch [e] (sendMessage "alert" ["Error saving pad! $e"]) 0)
+					0)
+            `null)))
 
 (function :Void find [:String url :Dynamic->Void resolve]
 	(localVar &mut sent false)
@@ -33,7 +35,7 @@ The WebPad contains an array of element objects:
 			// Make new pad with exact current url as pattern
 			(resolve (object id pad.length urlPattern url language "" content "")))))
 
-(function :Null save [:Dynamic pad]
+(function :Null save [:Dynamic pad :(Dynamic,Array<Dynamic>)->Void sendMessage]
 	(withWebPad true wholePad
 		(if (= pad.id wholePad.length)
 				(wholePad.push pad)