cmd/golangorg,content/static: render homepage using local root.html

This change alters the behavior to use a local copy of root.html
to render the homepage of golang.org. It is copied directly from
revision b7422f212878c68807c76351abc3fa02c5f6e7bd of doc/root.html
in the main go repository.

This will enable changes to be made to the homepage without having
to cherry pick them to a release branch.

Updates golang/go#9936
Updates golang/go#29206

Change-Id: I68a6ef017b969f8838f466721bce51c1b8a358d8
Reviewed-on: https://go-review.googlesource.com/c/website/+/180959
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Chris Broadfoot <cbro@golang.org>

cmd/golangorg/appinit.go

@@ -75,6 +75,9 @@ func main() {
 		fs.Bind("/", rootfs, "/", vfs.BindReplace)
 	}
 
+	// Use a local copy of root.html instead of the one in the main go repository.
+	// See golang.org/issue/29206 for more info.
+	fs.Bind("/doc/root.html", mapfs.New(static.Files), "/doc/root.html", vfs.BindReplace)
 	fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
 
 	webroot := getFullPath("/src/golang.org/x/website")

cmd/golangorg/main.go

@@ -202,9 +202,13 @@ func main() {
 		defer rc.Close() // be nice (e.g., -writeIndex mode)
 		fs.Bind("/", zipfs.New(rc, *zipfile), *goroot, vfs.BindReplace)
 	}
+	// Use a local copy of root.html instead of the one in the main go repository.
+	// See golang.org/issue/29206 for more info.
 	if *templateDir != "" {
+		fs.Bind("/doc/root.html", vfs.OS(*templateDir), "/doc/root.html", vfs.BindReplace)
 		fs.Bind("/lib/godoc", vfs.OS(*templateDir), "/", vfs.BindBefore)
 	} else {
+		fs.Bind("/doc/root.html", mapfs.New(static.Files), "/doc/root.html", vfs.BindReplace)
 		fs.Bind("/lib/godoc", mapfs.New(static.Files), "/", vfs.BindReplace)
 	}
 

content/static/doc/root.html

@@ -0,0 +1,164 @@
+<!--{
+	"Path": "/",
+	"Template": true
+}-->
+
+<div class="left">
+
+<div id="learn">
+{{if not $.GoogleCN}}
+<a class="popout share">Pop-out</a>
+{{end}}
+<div class="rootHeading">Try Go</div>
+<div class="input">
+<textarea spellcheck="false" class="code">// You can edit this code!
+// Click here and start typing.
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("Hello, 世界")
+}</textarea>
+</div>
+<div class="output">
+<pre>
+Hello, 世界
+</pre>
+</div>
+<div class="buttons">
+<a class="run" href="#" title="Run this code [shift-enter]">Run</a>
+{{if not $.GoogleCN}}
+<a class="share" href="#" title="Share this code">Share</a>
+<a class="tour" href="//tour.golang.org/" title="Learn Go from your browser">Tour</a>
+{{end}}
+</div>
+<div class="toys">
+<select>
+	<option value="hello.go">Hello, World!</option>
+	<option value="life.go">Conway's Game of Life</option>
+	<option value="fib.go">Fibonacci Closure</option>
+	<option value="peano.go">Peano Integers</option>
+	<option value="pi.go">Concurrent pi</option>
+	<option value="sieve.go">Concurrent Prime Sieve</option>
+	<option value="solitaire.go">Peg Solitaire Solver</option>
+	<option value="tree.go">Tree Comparison</option>
+</select>
+</div>
+</div>
+
+</div>
+
+<div class="right">
+
+<div id="about">
+Go is an open source programming language that makes it easy to build
+simple, reliable, and efficient software.
+</div>
+
+<div id="gopher"></div>
+
+<a href="/dl/" id="start">
+<span class="big">Download Go</span>
+<span class="desc">
+Binary distributions available for<br>
+Linux, macOS, Windows, and more.
+</span>
+</a>
+
+</div>
+
+<div style="clear: both"></div>
+
+{{if not $.GoogleCN}}
+<div class="left">
+  <div id="video">
+    <div class="rootHeading">Featured video</div>
+	<div class="js-frontpage-video" style="--aspect-ratio-padding: 58.07%;"><iframe width="415" height="241" src="//www.youtube.com/embed/ytEkHepK08c" frameborder="0" allowfullscreen></iframe></div>
+  </div>
+</div>
+
+<div class="right">
+	<div id="blog">
+		<div class="rootHeading">Featured articles</div>
+		<div class="read"><a href="//blog.golang.org/">Read more</a></div>
+	</div>
+</div>
+{{end}}
+
+<div style="clear: both;"></div>
+
+<script>
+(function() {
+	'use strict';
+
+	window.initFuncs.push(function() {
+		// Set up playground if enabled.
+		if (window.playground) {
+			window.playground({
+				"codeEl":        "#learn .code",
+				"outputEl":      "#learn .output",
+				"runEl":         "#learn .run",
+				"shareEl":       "#learn .share",
+				"shareRedirect": "//play.golang.org/p/",
+				"toysEl":        "#learn .toys select"
+			});
+		} else {
+			$('#learn').hide()
+		}
+	});
+
+	{{if not $.GoogleCN}}
+
+	function readableTime(t) {
+		var m = ["January", "February", "March", "April", "May", "June", "July",
+			"August", "September", "October", "November", "December"];
+		var p = t.substring(0, t.indexOf("T")).split("-");
+		var d = new Date(p[0], p[1]-1, p[2]);
+		return d.getDate() + " " + m[d.getMonth()] + " " + d.getFullYear();
+	}
+
+	window.feedLoaded = function(result) {
+		var blog = document.getElementById("blog");
+		var read = blog.getElementsByClassName("read")[0];
+		for (var i = 0; i < result.length && i < 2; i++) {
+			var entry = result[i];
+			var title = document.createElement("a");
+			title.className = "title";
+			title.href = entry.Link;
+			title.innerHTML = entry.Title;
+			blog.insertBefore(title, read);
+			var extract = document.createElement("div");
+			extract.className = "extract";
+			extract.innerHTML = entry.Summary;
+			blog.insertBefore(extract, read);
+			var when = document.createElement("div");
+			when.className = "when";
+			when.innerHTML = "Published " + readableTime(entry.Time);
+			blog.insertBefore(when, read);
+		}
+	}
+
+	window.initFuncs.push(function() {
+		// Load blog feed.
+		$('<script/>').attr('text', 'text/javascript')
+			.attr('src', '//blog.golang.org/.json?jsonp=feedLoaded')
+			.appendTo('body');
+
+		// Set the video at random.
+		var videos = [
+			{h: 241, s: "//www.youtube.com/embed/ytEkHepK08c"}, // Tour of Go
+			{h: 241, s: "//www.youtube.com/embed/f6kdp27TYZs"}, // Concurrency Patterns
+			{h: 233, s: "//player.vimeo.com/video/69237265"}    // Simple environment
+		];
+		var v = videos[Math.floor(Math.random()*videos.length)];
+		$('#video iframe').attr('height', v.h).attr('src', v.s);
+		// Compute the aspect ratio (as a percentage) of the video
+		// using the fixed width 415 and the height of the current video, v.h.
+		var ar = 100*v.h/415;
+		$('.js-frontpage-video').attr('style', '--aspect-ratio-padding: ' + ar + '%;');
+	});
+
+	{{end}}
+})();
+</script>

content/static/gen.go

@@ -36,6 +36,7 @@ var files = []string{
 	"codewalk.html",
 	"codewalkdir.html",
 	"dirlist.html",
+	"doc/root.html",
 	"error.html",
 	"example.html",
 	"godoc.html",