Proper integration of live reload with automatic injection

3 files changed, 161 insertions, 0 deletions

diff --git a/livereload/connection.go b/livereload/connection.go
new file mode 100644
index 000000000..70a7e6d5d
--- /dev/null
+++ b/livereload/connection.go
@@ -0,0 +1,56 @@
+// Copyright © 2014 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Simple Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://opensource.org/licenses/Simple-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package livereload
+
+import (
+	"bytes"
+
+	"github.com/gorilla/websocket"
+)
+
+type connection struct {
+	// The websocket connection.
+	ws *websocket.Conn
+
+	// Buffered channel of outbound messages.
+	send chan []byte
+}
+
+func (c *connection) reader() {
+	for {
+		_, message, err := c.ws.ReadMessage()
+		if err != nil {
+			break
+		}
+		switch true {
+		case bytes.Contains(message, []byte(`"command":"hello"`)):
+			wsHub.broadcast <- []byte(`{
+			  "command": "hello",
+			  "protocols": [ "http://livereload.com/protocols/official-7" ],
+			  "serverName": "Hugo"
+			  }`)
+		}
+	}
+	c.ws.Close()
+}
+
+func (c *connection) writer() {
+	for message := range c.send {
+		err := c.ws.WriteMessage(websocket.TextMessage, message)
+		if err != nil {
+			break
+		}
+	}
+	c.ws.Close()
+}
diff --git a/livereload/hub.go b/livereload/hub.go
new file mode 100644
index 000000000..46afbcbc3
--- /dev/null
+++ b/livereload/hub.go
@@ -0,0 +1,56 @@
+// Copyright © 2014 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Simple Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://opensource.org/licenses/Simple-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package livereload
+
+type hub struct {
+	// Registered connections.
+	connections map[*connection]bool
+
+	// Inbound messages from the connections.
+	broadcast chan []byte
+
+	// Register requests from the connections.
+	register chan *connection
+
+	// Unregister requests from connections.
+	unregister chan *connection
+}
+
+var wsHub = hub{
+	broadcast:   make(chan []byte),
+	register:    make(chan *connection),
+	unregister:  make(chan *connection),
+	connections: make(map[*connection]bool),
+}
+
+func (h *hub) run() {
+	for {
+		select {
+		case c := <-h.register:
+			h.connections[c] = true
+		case c := <-h.unregister:
+			delete(h.connections, c)
+			close(c.send)
+		case m := <-h.broadcast:
+			for c := range h.connections {
+				select {
+				case c.send <- m:
+				default:
+					delete(h.connections, c)
+					close(c.send)
+				}
+			}
+		}
+	}
+}
diff --git a/livereload/livereload.go b/livereload/livereload.go
new file mode 100644
index 000000000..9fb24696d
--- /dev/null
+++ b/livereload/livereload.go
@@ -0,0 +1,49 @@
+// Copyright © 2014 Steve Francia <spf@spf13.com>.
+//
+// Licensed under the Simple Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://opensource.org/licenses/Simple-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package livereload
+
+import (
+	"net/http"
+
+	"github.com/gorilla/websocket"
+)
+
+var upgrader = &websocket.Upgrader{ReadBufferSize: 1024, WriteBufferSize: 1024}
+
+func Handler(w http.ResponseWriter, r *http.Request) {
+	ws, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		return
+	}
+	c := &connection{send: make(chan []byte, 256), ws: ws}
+	wsHub.register <- c
+	defer func() { wsHub.unregister <- c }()
+	go c.writer()
+	c.reader()
+}
+
+func Initialize() {
+	go wsHub.run()
+}
+
+func ForceRefresh() {
+	// Tell livereload a js file changed to force a hard refresh
+	wsHub.broadcast <- []byte(`{"command":"reload","path":"/x.js","originalPath":"","liveCSS":true}`)
+}
+
+func ServeJS(w http.ResponseWriter, r *http.Request) {
+	w.Write(livereloadJS)
+}
+
+var livereloadJS []byte = []byte(`(function(){var e={},t={},n={},r={},i={},s={},o={},u={},a={};var f,l,c,h,p=[].indexOf||function(e){for(var t=0,n=this.length;t<n;t++){if(t in this&&this[t]===e)return t}return-1};e.PROTOCOL_6=f="http://livereload.com/protocols/official-6";e.PROTOCOL_7=l="http://livereload.com/protocols/official-7";e.ProtocolError=h=function(){function e(e,t){this.message="LiveReload protocol error ("+e+') after receiving data: "'+t+'".'}return e}();e.Parser=c=function(){function e(e){this.handlers=e;this.reset()}e.prototype.reset=function(){return this.protocol=null};e.prototype.process=function(e){var t,n,r,i,s;try{if(this.protocol==null){if(e.match(/^!!ver:([\d.]+)$/)){this.protocol=6}else if(r=this._parseMessage(e,["hello"])){if(!r.protocols.length){throw new h("no protocols specified in handshake message")}else if(p.call(r.protocols,l)>=0){this.protocol=7}else if(p.call(r.protocols,f)>=0){this.protocol=6}else{throw new h("no supported protocols found")}}return this.handlers.connected(this.protocol)}else if(this.protocol===6){r=JSON.parse(e);if(!r.length){throw new h("protocol 6 messages must be arrays")}t=r[0],i=r[1];if(t!=="refresh"){throw new h("unknown protocol 6 command")}return this.handlers.message({command:"reload",path:i.path,liveCSS:(s=i.apply_css_live)!=null?s:true})}else{r=this._parseMessage(e,["reload","alert"]);return this.handlers.message(r)}}catch(o){n=o;if(n instanceof h){return this.handlers.error(n)}else{throw n}}};e.prototype._parseMessage=function(e,t){var n,r,i;try{r=JSON.parse(e)}catch(s){n=s;throw new h("unparsable JSON",e)}if(!r.command){throw new h('missing "command" key',e)}if(i=r.command,p.call(t,i)<0){throw new h("invalid command '"+r.command+"', only valid commands are: "+t.join(", ")+")",e)}return r};return e}();var d,f,l,c,v,m;m=e,c=m.Parser,f=m.PROTOCOL_6,l=m.PROTOCOL_7;v="2.0.8";t.Connector=d=function(){function e(e,t,n,r){var i=this;this.options=e;this.WebSocket=t;this.Timer=n;this.handlers=r;this._uri="ws://"+this.options.host+":"+this.options.port+"/livereload";this._nextDelay=this.options.mindelay;this._connectionDesired=false;this.protocol=0;this.protocolParser=new c({connected:function(e){i.protocol=e;i._handshakeTimeout.stop();i._nextDelay=i.options.mindelay;i._disconnectionReason="broken";return i.handlers.connected(e)},error:function(e){i.handlers.error(e);return i._closeOnError()},message:function(e){return i.handlers.message(e)}});this._handshakeTimeout=new n(function(){if(!i._isSocketConnected()){return}i._disconnectionReason="handshake-timeout";return i.socket.close()});this._reconnectTimer=new n(function(){if(!i._connectionDesired){return}return i.connect()});this.connect()}e.prototype._isSocketConnected=function(){return this.socket&&this.socket.readyState===this.WebSocket.OPEN};e.prototype.connect=function(){var 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this._sendCommand(e)};e.prototype._sendCommand=function(e){return this.socket.send(JSON.stringify(e))};e.prototype._closeOnError=function(){this._handshakeTimeout.stop();this._disconnectionReason="error";return this.socket.close()};e.prototype._onopen=function(e){var t;this.handlers.socketConnected();this._disconnectionReason="handshake-failed";t={command:"hello",protocols:[f,l]};t.ver=v;if(this.options.ext){t.ext=this.options.ext}if(this.options.extver){t.extver=this.options.extver}if(this.options.snipver){t.snipver=this.options.snipver}this._sendCommand(t);return this._handshakeTimeout.start(this.options.handshake_timeout)};e.prototype._onclose=function(e){this.protocol=0;this.handlers.disconnected(this._disconnectionReason,this._nextDelay);return this._scheduleReconnection()};e.prototype._onerror=function(e){};e.prototype._onmessage=function(e){return this.protocolParser.process(e.data)};return e}();var g;g={bind:function(e,t,n){if(e.addEventListener){return e.addEventListener(t,n,false)}else if(e.attachEvent){e[t]=1;return e.attachEvent("onpropertychange",function(e){if(e.propertyName===t){return n()}})}else{throw new Error("Attempt to attach custom event "+t+" to something which isn't a DOMElement")}},fire:function(e,t){var n;if(e.addEventListener){n=document.createEvent("HTMLEvents");n.initEvent(t,true,true);return document.dispatchEvent(n)}else if(e.attachEvent){if(e[t]){return e[t]++}}else{throw new Error("Attempt to fire custom event "+t+" on something which isn't a DOMElement")}}};n.bind=g.bind;n.fire=g.fire;var y;r=y=function(){function e(e,t){this.window=e;this.host=t}e.identifier="less";e.version="1.0";e.prototype.reload=function(e,t){if(this.window.less&&this.window.less.refresh){if(e.match(/\.less$/i)){return this.reloadLess(e)}if(t.originalPath.match(/\.less$/i)){return this.reloadLess(t.originalPath)}}return false};e.prototype.reloadLess=function(e){var t,n,r,i;n=function(){var e,n,r,i;r=document.getElementsByTagName("link");i=[];for(e=0,n=r.length;e<n;e++){t=r[e];if(t.href&&t.rel==="stylesheet/less"||t.rel.match(/stylesheet/)&&t.type.match(/^text\/(x-)?less$/)){i.push(t)}}return i}();if(n.length===0){return false}for(r=0,i=n.length;r<i;r++){t=n[r];t.href=this.host.generateCacheBustUrl(t.href)}this.host.console.log("LiveReload is asking LESS to recompile all stylesheets");this.window.less.refresh(true);return true};e.prototype.analyze=function(){return{disable:!!(this.window.less&&this.window.less.refresh)}};return e}();var b;i.Timer=b=function(){function e(e){var t=this;this.func=e;this.running=false;this.id=null;this._handler=function(){t.running=false;t.id=null;return t.func()}}e.prototype.start=function(e){if(this.running){clearTimeout(this.id)}this.id=setTimeout(this._handler,e);return this.running=true};e.prototype.stop=function(){if(this.running){clearTimeout(this.id);this.running=false;return this.id=null}};return e}();b.start=function(e,t){return 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t,n,r;if((n=e.indexOf("#"))>=0){t=e.slice(n);e=e.slice(0,n)}else{t=""}if((n=e.indexOf("?"))>=0){r=e.slice(n);e=e.slice(0,n)}else{r=""}return{url:e,params:r,hash:t}};T=function(e){var t;e=k(e).url;if(e.indexOf("file://")===0){t=e.replace(/^file:\/\/(localhost)?/,"")}else{t=e.replace(/^([^:]+:)?\/\/([^:\/]+)(:\d*)?\//,"/")}return decodeURIComponent(t)};C=function(e,t,n){var r,i,s,o,u;r={score:0};for(o=0,u=t.length;o<u;o++){i=t[o];s=x(e,n(i));if(s>r.score){r={object:i,score:s}}}if(r.score>0){return r}else{return null}};x=function(e,t){var n,r,i,s;e=e.replace(/^\/+/,"").toLowerCase();t=t.replace(/^\/+/,"").toLowerCase();if(e===t){return 1e4}n=e.split("/").reverse();r=t.split("/").reverse();s=Math.min(n.length,r.length);i=0;while(i<s&&n[i]===r[i]){++i}return i};N=function(e,t){return x(e,t)>0};E=[{selector:"background",styleNames:["backgroundImage"]},{selector:"border",styleNames:["borderImage","webkitBorderImage","MozBorderImage"]}];o.Reloader=S=function(){function 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'+i+";";u.__LiveReload_newHref=t;a=this.document.createElement("link");a.rel="stylesheet";a.href=t;a.__LiveReload_pendingRemoval=true;if(r.parentNode){r.parentNode.insertBefore(a,r)}return this.Timer.start(this.importCacheWaitPeriod,function(){if(a.parentNode){a.parentNode.removeChild(a)}if(u.__LiveReload_newHref!==t){return}o.insertRule(s,n);o.deleteRule(n+1);u=o.cssRules[n];u.__LiveReload_newHref=t;return f.Timer.start(f.importCacheWaitPeriod,function(){if(u.__LiveReload_newHref!==t){return}o.insertRule(s,n);return o.deleteRule(n+1)})})};e.prototype.generateUniqueString=function(){return"livereload="+Date.now()};e.prototype.generateCacheBustUrl=function(e,t){var n,r,i,s,o;if(t==null){t=this.generateUniqueString()}o=k(e),e=o.url,n=o.hash,r=o.params;if(this.options.overrideURL){if(e.indexOf(this.options.serverURL)<0){i=e;e=this.options.serverURL+this.options.overrideURL+"?url="+encodeURIComponent(e);this.console.log("LiveReload is overriding source URL "+i+" with "+e)}}s=r.replace(/(\?|&)livereload=(\d+)/,function(e,n){return""+n+t});if(s===r){if(r.length===0){s="?"+t}else{s=""+r+"&"+t}}return e+s+n};return e}();var d,L,w,S,b;d=t.Connector;b=i.Timer;w=s.Options;S=o.Reloader;u.LiveReload=L=function(){function e(e){var t=this;this.window=e;this.listeners={};this.plugins=[];this.pluginIdentifiers={};this.console=this.window.location.href.match(/LR-verbose/)&&this.window.console&&this.window.console.log&&this.window.console.error?this.window.console:{log:function(){},error:function(){}};if(!(this.WebSocket=this.window.WebSocket||this.window.MozWebSocket)){console.error("LiveReload disabled because the browser does not seem to support web sockets");return}if(!(this.options=w.extract(this.window.document))){console.error("LiveReload disabled because it could not find its own <SCRIPT> tag");return}this.reloader=new S(this.window,this.console,b);this.connector=new d(this.options,this.WebSocket,b,{connecting:function(){},socketConnected:function(){},connected:function(e){var n;if(typeof (n=t.listeners).connect==="function"){n.connect()}t.log("LiveReload is connected to "+t.options.host+":"+t.options.port+" (protocol v"+e+").");return t.analyze()},error:function(e){if(e instanceof h){return console.log(""+e.message+".")}else{return console.log("LiveReload internal error: "+e.message)}},disconnected:function(e,n){var r;if(typeof (r=t.listeners).disconnect==="function"){r.disconnect()}switch(e){case"cannot-connect":return t.log("LiveReload cannot connect to "+t.options.host+":"+t.options.port+", will retry in "+n+" sec.");case"broken":return t.log("LiveReload disconnected from "+t.options.host+":"+t.options.port+", reconnecting in "+n+" sec.");case"handshake-timeout":return t.log("LiveReload cannot connect to "+t.options.host+":"+t.options.port+" (handshake timeout), will retry in "+n+" sec.");case"handshake-failed":return t.log("LiveReload cannot connect to "+t.options.host+":"+t.options.port+" (handshake failed), will retry in "+n+" sec.");case"manual":break;case"error":break;default:return t.log("LiveReload disconnected from "+t.options.host+":"+t.options.port+" ("+e+"), reconnecting in "+n+" sec.")}},message:function(e){switch(e.command){case"reload":return t.performReload(e);case"alert":return t.performAlert(e)}}})}e.prototype.on=function(e,t){return this.listeners[e]=t};e.prototype.log=function(e){return this.console.log(""+e)};e.prototype.performReload=function(e){var t,n;this.log("LiveReload received reload request: "+JSON.stringify(e,null,2));return this.reloader.reload(e.path,{liveCSS:(t=e.liveCSS)!=null?t:true,liveImg:(n=e.liveImg)!=null?n:true,originalPath:e.originalPath||"",overrideURL:e.overrideURL||"",serverURL:"http://"+this.options.host+":"+this.options.port})};e.prototype.performAlert=function(e){return alert(e.message)};e.prototype.shutDown=function(){var e;this.connector.disconnect();this.log("LiveReload disconnected.");return typeof (e=this.listeners).shutdown==="function"?e.shutdown():void 0};e.prototype.hasPlugin=function(e){return!!this.pluginIdentifiers[e]};e.prototype.addPlugin=function(e){var t,n=this;if(this.hasPlugin(e.identifier)){return}this.pluginIdentifiers[e.identifier]=true;t=new e(this.window,{_livereload:this,_reloader:this.reloader,_connector:this.connector,console:this.console,Timer:b,generateCacheBustUrl:function(e){return n.reloader.generateCacheBustUrl(e)}});this.plugins.push(t);this.reloader.addPlugin(t)};e.prototype.analyze=function(){var e,t,n,r,i,s;if(!(this.connector.protocol>=7)){return}n={};s=this.plugins;for(r=0,i=s.length;r<i;r++){e=s[r];n[e.constructor.identifier]=t=(typeof e.analyze==="function"?e.analyze():void 0)||{};t.version=e.constructor.version}this.connector.sendCommand({command:"info",plugins:n,url:this.window.location.href})};return e}();var g,L,A;g=n;L=window.LiveReload=new u.LiveReload(window);for(A in window){if(A.match(/^LiveReloadPlugin/)){L.addPlugin(window[A])}}L.addPlugin(r);L.on("shutdown",function(){return delete window.LiveReload});L.on("connect",function(){return g.fire(document,"LiveReloadConnect")});L.on("disconnect",function(){return g.fire(document,"LiveReloadDisconnect")});g.bind(document,"LiveReloadShutDown",function(){return L.shutDown()})})()`)