added clipboard functionality with your comments

templates/example.tmpl

@@ -28,7 +28,7 @@
             {{.DocsRendered}}
           </td>
           <td class="code{{if .CodeEmpty}} empty{{end}}{{if .CodeLeading}} leading{{end}}">
-	        {{if .CodeRun}}<a href="http://play.golang.org/p/{{$.UrlHash}}"><img title="Run code" src="play.png" class="run" /></a>{{end}}
+	        {{if .CodeRun}}<a href="http://play.golang.org/p/{{$.UrlHash}}"><img title="Run code" src="play.png" class="run" /></a><img title="Copy code" src="clipboard.png" class="copy" />{{end}}
             {{.CodeRendered}}
           </td>
         </tr>
@@ -44,5 +44,10 @@
         by <a href="https://twitter.com/mmcgrana">@mmcgrana</a> | <a href="mailto:mmcgrana@gmail.com">feedback</a> | <a href="https://github.com/mmcgrana/gobyexample/blob/master/examples/{{.Id}}">source</a> | <a href="https://github.com/mmcgrana/gobyexample#license">license</a>
       </p>
     </div>
+    <script>
+      var codeLines = [];
+      {{range .Segs}}{{range .}}codeLines.push('{{js .CodeForJs}}'); {{end}}{{end}}
+    </script>
+    <script src="site.js" async></script>
   </body>
 </html>

templates/site.css

@@ -136,11 +136,14 @@ pre, code {
     font-size: 14px; line-height: 18px;
     font-family: 'Menlo', 'Monaco', 'Consolas', 'Lucida Console', monospace;
 }
-img.run {
+img.copy, img.run {
   height: 16px;
   width: 16px;
   float: right
 }
+img.copy {
+  cursor: pointer;
+}
 
 /* Syntax highlighting */
 body .hll { background-color: #ffffcc }

tools/generate.go

@@ -120,7 +120,7 @@ var dashPat = regexp.MustCompile("\\-+")
 
 type Seg struct {
     Docs, DocsRendered              string
-    Code, CodeRendered              string
+    Code, CodeRendered, CodeForJs   string
     CodeEmpty, CodeLeading, CodeRun bool
 }
 
@@ -205,6 +205,10 @@ func parseAndRenderSegs(sourcePath string) ([]*Seg, string) {
         }
         if seg.Code != "" {
             seg.CodeRendered = cachedPygmentize(lexer, seg.Code)
+            // adding the content to the js code for copying to the clipboard
+            if strings.HasSuffix(sourcePath, ".go") {
+                seg.CodeForJs = strings.Trim(seg.Code, "\n") + "\n"
+            }
         }
     }
     // we are only interested in the 'go' code to pass to play.golang.org
@@ -276,9 +280,11 @@ func renderExamples(examples []*Example) {
 
 func main() {
     copyFile("templates/site.css", siteDir+"/site.css")
+    copyFile("templates/site.js", siteDir+"/site.js")
     copyFile("templates/favicon.ico", siteDir+"/favicon.ico")
     copyFile("templates/404.html", siteDir+"/404.html")
     copyFile("templates/play.png", siteDir+"/play.png")
+    copyFile("templates/clipboard.png", siteDir+"/clipboard.png")
     examples := parseExamples()
     renderIndex(examples)
     renderExamples(examples)