From 475da6dbf2d5d135df0c14cec57e486416032692 Mon Sep 17 00:00:00 2001
From: Cory McWilliams <cory@unprompted.com>
Date: Sun, 18 Sep 2016 12:56:31 +0000
Subject: [PATCH] Auto-scroll containing terminal if an iframe resizes.  Other
 oEmbed tweaks.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3336 ed5197a5-7fde-0310-b194-c3ffbd925b24
---
 core/client.js                       |  7 +++++++
 packages/cory/libunfurl/libunfurl.js | 31 +++++++++++++++++++++-------
 2 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/core/client.js b/core/client.js
index 938db2ae..9f41448a 100644
--- a/core/client.js
+++ b/core/client.js
@@ -527,6 +527,13 @@ function onMessage(event) {
 		var iframe = document.getElementById("iframe_" + event.data.name);
 		iframe.setAttribute("width", event.data.width);
 		iframe.setAttribute("height", event.data.height);
+		var node = iframe.parentElement;
+		while (node && !node.classList.contains("terminal")) {
+			node = node.parentElement;
+		}
+		if (node) {
+			autoScroll(node);
+		}
 	} else {
 		send({event: "onWindowMessage", message: event.data});
 	}
diff --git a/packages/cory/libunfurl/libunfurl.js b/packages/cory/libunfurl/libunfurl.js
index bb50298f..7ead793f 100644
--- a/packages/cory/libunfurl/libunfurl.js
+++ b/packages/cory/libunfurl/libunfurl.js
@@ -6,6 +6,7 @@ let libxml = require("libxml");
 let libhttp = require("libhttp");
 
 let gEmbedIndex = 0;
+let gCache = {};
 
 async function unfurl(url) {
 	let result = {href: url};
@@ -26,10 +27,8 @@ async function unfurl(url) {
 		result = [{href: url}, "\n", {
 			name: "oEmbed" + gEmbedIndex,
 			iframe: `
-	<span style="border: 0; padding: 0; margin: 0; overflow: hidden">
-		${oEmbed.html}
-	</span>
-	<script language="javascript">
+	<style type="text/css">border: 0; padding: 0; margin: 0; overflow: hidden</style>
+	${oEmbed.html}<script language="javascript">
 		let gResizeMeMessage = {
 			event: "resizeMe",
 			name: "oEmbed${gEmbedIndex}",
@@ -44,8 +43,7 @@ async function unfurl(url) {
 				parent.postMessage(gResizeMeMessage, "*");
 			}
 		}, 100);
-	</script>
-`,
+	</script>`,
 			width: oEmbed.width || 320,
 			height: oEmbed.height || 120,
 			style: "margin: 0; padding: 0; border: 0; overflow: hidden",
@@ -62,6 +60,23 @@ async function test() {
 
 //test().catch(terminal.print);
 
-core.register("onMessage", function(sender, message) {
-	return unfurl(message).catch(error => [message, "(error retrieving: ", error, ")"]);
+core.register("onMessage", async function(sender, message) {
+	let result = message;
+	if (gCache[message] && new Date().valueOf() < gCache[message].expires) {
+		result = gCache[message].result;
+	} else {
+		if (gCache[message]) {
+			print("Didn't use", gCache[message]);
+		}
+		try {
+			result = await unfurl(message);
+		} catch (error) {
+			result = [message, "(error retrieving: ", error, ")"];
+		}
+		gCache[message] = {
+			expires: new Date().valueOf() + 7 * 24 * 60 * 60 * 1000,
+			result: result,
+		};
+	}
+	return result;
 });
\ No newline at end of file