From 6b0fa399d50c3b43fd2f1ae5420991d258a55fc9 Mon Sep 17 00:00:00 2001
From: Leo Horie <leohorie@hotmail.com>
Date: Wed, 10 Aug 2016 13:53:05 -0400
Subject: [PATCH] rebuild after stream changes

---
 mithril.js     | 56 ++++++++++++++++++-----------------
 mithril.min.js | 80 +++++++++++++++++++++++++-------------------------
 util/stream.js |  2 +-
 3 files changed, 70 insertions(+), 68 deletions(-)

diff --git a/mithril.js b/mithril.js
index 9c83ef6b..f8a3e3d5 100644
--- a/mithril.js
+++ b/mithril.js
@@ -49,15 +49,7 @@ function updateStream(stream, value, error) {
 function updateState(stream, value, error) {
 	error = unwrapError(value, error)
 	if (error !== undefined && typeof stream._state.recover === "function") {
-		try {
-			var recovered = stream._state.recover()
-			if (recovered === HALT) return
-			updateValues(stream, recovered, undefined)
-		}
-		catch (e) {
-			updateValues(stream, undefined, e)
-			reportUncaughtError(stream, e)
-		}
+		if (!resolve(stream, updateValues, true)) return
 	}
 	else updateValues(stream, value, error)
 	stream._state.changed = true
@@ -72,19 +64,21 @@ function updateDependency(stream, mustSync) {
 	if (parents.length > 0 && parents.filter(active).length === parents.length && (mustSync || parents.filter(changed).length > 0)) {
 		var failed = parents.filter(errored)
 		if (failed.length > 0) updateState(stream, undefined, failed[0]._state.error)
-		else {
-			try {
-				var value = state.derive()
-				if (value === HALT) return
-				updateState(stream, value, undefined)
-			}
-			catch (e) {
-				updateState(stream, undefined, e)
-				reportUncaughtError(stream, e)
-			}
-		}
+		else resolve(stream, updateState, false)
 	}
 }
+function resolve(stream, update, shouldRecover) {
+	try {
+		var value = shouldRecover ? stream._state.recover() : stream._state.derive()
+		if (value === HALT) return false
+		update(stream, value, undefined)
+	}
+	catch (e) {
+		update(stream, undefined, e)
+		reportUncaughtError(stream, e)
+	}
+	return true
+}
 function unwrapError(value, error) {
 	if (value != null && value.constructor === createStream) {
 		if (value._state.error !== undefined) error = value._state.error
@@ -97,7 +91,7 @@ function finalize(stream) {
 	for (var id in stream._state.deps) stream._state.deps[id]._state.changed = false
 }
 function reportUncaughtError(stream, e) {
-	if (Object.keys(stream._state.deps).length === 0) {
+	if (Object.keys(stream._state.deps).length === 0 && stream._state.derive == null) {
 		setTimeout(function() {
 			if (Object.keys(stream._state.deps).length === 0) console.error(e)
 		}, 0)
@@ -124,11 +118,19 @@ function combine(fn, streams) {
 }
 function absorb(stream, value) {
 	if (value != null && value.constructor === createStream) {
-		value.error.map(stream.error)
-		value.map(stream)
-		if (value._state.state === 0) return HALT
-		if (value._state.error) throw value._state.error
-		value = value._state.value
+		var absorbable = value
+		var update = function() {
+			updateState(stream, absorbable._state.value, absorbable._state.error)
+			for (var id in stream._state.deps) updateDependency(stream._state.deps[id], false)
+		}
+		absorbable.map(update).catch(function(e) {
+			update()
+			throw e
+		})
+		
+		if (absorbable._state.state === 0) return HALT
+		if (absorbable._state.error) throw absorbable._state.error
+		value = absorbable._state.value
 	}
 	return value
 }
@@ -175,7 +177,7 @@ function reject(e) {
 }
 function merge(streams) {
 	return combine(function () {
-		return streams.map(function (s) {return s()})
+		return streams.map(function(s) {return s()})
 	}, streams)
 }
 var Stream = {stream: createStream, merge: merge, combine: combine, reject: reject, HALT: HALT}
diff --git a/mithril.min.js b/mithril.min.js
index 56430b46..683fc863 100644
--- a/mithril.min.js
+++ b/mithril.min.js
@@ -1,40 +1,40 @@
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diff --git a/util/stream.js b/util/stream.js
index 9c73e01e..b02752cf 100644
--- a/util/stream.js
+++ b/util/stream.js
@@ -1,4 +1,4 @@
-//"use strict"
+"use strict"
 
 var guid = 0, noop = function() {}, HALT = {}
 function createStream() {