add progressive enhanced syntax highlighter

it loads a script at the end of the page that loads the required
resources and initializes the syntax highlighter.

if js is disabled or blocked nothing happens, the code blocks will
display with the style they had until now

6 files changed, 143 insertions, 2 deletions

diff --git a/lib/erl_docgen/priv/css/Makefile b/lib/erl_docgen/priv/css/Makefile
index c317411d32..e3d2ee7e3f 100644
--- a/lib/erl_docgen/priv/css/Makefile
+++ b/lib/erl_docgen/priv/css/Makefile
@@ -39,7 +39,8 @@ RELSYSDIR = $(RELEASE_PATH)/lib/erl_docgen-$(VSN)
 
 
 CSS_FILES = \
-	otp_doc.css
+	otp_doc.css \
+	highlight.css
 
 
 # ----------------------------------------------------
diff --git a/lib/erl_docgen/priv/css/highlight.css b/lib/erl_docgen/priv/css/highlight.css
new file mode 100644
index 0000000000..d5bd1d2a9a
--- /dev/null
+++ b/lib/erl_docgen/priv/css/highlight.css
@@ -0,0 +1,96 @@
+/*
+
+Atom One Light by Daniel Gamage
+Original One Light Syntax theme from https://github.com/atom/one-light-syntax
+
+base:    #fafafa
+mono-1:  #383a42
+mono-2:  #686b77
+mono-3:  #a0a1a7
+hue-1:   #0184bb
+hue-2:   #4078f2
+hue-3:   #a626a4
+hue-4:   #50a14f
+hue-5:   #e45649
+hue-5-2: #c91243
+hue-6:   #986801
+hue-6-2: #c18401
+
+*/
+
+.hljs {
+  display: block;
+  overflow-x: auto;
+  padding: 0.5em;
+  color: #383a42;
+  background: #fafafa;
+}
+
+.hljs-comment,
+.hljs-quote {
+  color: #a0a1a7;
+  font-style: italic;
+}
+
+.hljs-doctag,
+.hljs-keyword,
+.hljs-formula {
+  color: #a626a4;
+}
+
+.hljs-section,
+.hljs-name,
+.hljs-selector-tag,
+.hljs-deletion,
+.hljs-subst {
+  color: #e45649;
+}
+
+.hljs-literal {
+  color: #0184bb;
+}
+
+.hljs-string,
+.hljs-regexp,
+.hljs-addition,
+.hljs-attribute,
+.hljs-meta-string {
+  color: #50a14f;
+}
+
+.hljs-built_in,
+.hljs-class .hljs-title {
+  color: #c18401;
+}
+
+.hljs-attr,
+.hljs-variable,
+.hljs-template-variable,
+.hljs-type,
+.hljs-selector-class,
+.hljs-selector-attr,
+.hljs-selector-pseudo,
+.hljs-number {
+  color: #986801;
+}
+
+.hljs-symbol,
+.hljs-bullet,
+.hljs-link,
+.hljs-meta,
+.hljs-selector-id,
+.hljs-title {
+  color: #4078f2;
+}
+
+.hljs-emphasis {
+  font-style: italic;
+}
+
+.hljs-strong {
+  font-weight: bold;
+}
+
+.hljs-link {
+  text-decoration: underline;
+}
diff --git a/lib/erl_docgen/priv/js/flipmenu/Makefile b/lib/erl_docgen/priv/js/flipmenu/Makefile
index 06a13defca..ad6d4acb6c 100644
--- a/lib/erl_docgen/priv/js/flipmenu/Makefile
+++ b/lib/erl_docgen/priv/js/flipmenu/Makefile
@@ -76,6 +76,7 @@ release_spec: opt
 release_docs_spec:
 	$(INSTALL_DIR) "$(RELEASE_PATH)/doc/js/flipmenu"
 	$(INSTALL_DATA) $(JS_FILES) $(GIF_FILES) "$(RELEASE_PATH)/doc/js/flipmenu"
+	$(INSTALL_DATA) ../highlight.js ../highlight.pack.js "$(RELEASE_PATH)/doc/js/"
 
 release_tests_spec:
 
diff --git a/lib/erl_docgen/priv/js/highlight.js b/lib/erl_docgen/priv/js/highlight.js
new file mode 100644
index 0000000000..0594b42aa3
--- /dev/null
+++ b/lib/erl_docgen/priv/js/highlight.js
@@ -0,0 +1,39 @@
+/*globals document, window*/
+window.addEventListener("load", function () {
+    "use strict";
+    var body = document.body,
+        base = window.__otpTopDocDir || "/doc/js/",
+        cssLink = document.createElement('link'),
+        script = document.createElement('script'),
+        intervalId, attempts = 0;
+
+    cssLink.rel = "stylesheet";
+    cssLink.href = base + "../highlight.css";
+    script.src = base + "highlight.pack.js";
+
+    body.appendChild(cssLink);
+    body.appendChild(script);
+
+    function doHighlight() {
+        attempts += 1;
+
+        if (attempts > 20) {
+            window.clearInterval(intervalId);
+            return;
+        }
+
+        if (!window.hljs) {
+            return;
+        }
+
+        window.clearInterval(intervalId);
+
+        var i, len, nodes = document.querySelectorAll('.example');
+        for (i = 0, len = nodes.length; i < len; i += 1) {
+            window.hljs.highlightBlock(nodes[i]);
+        }
+
+    }
+
+    intervalId = window.setInterval(doHighlight, 50);
+});
diff --git a/lib/erl_docgen/priv/js/highlight.pack.js b/lib/erl_docgen/priv/js/highlight.pack.js
new file mode 100644
index 0000000000..073d39e644
--- /dev/null
+++ b/lib/erl_docgen/priv/js/highlight.pack.js
@@ -0,0 +1,2 @@
+/*! highlight.js v9.7.0 | BSD3 License | git.io/hljslicense */
+!function(e){var n="object"==typeof window&&window||"object"==typeof self&&self;"undefined"!=typeof exports?e(exports):n&&(n.hljs=e({}),"function"==typeof define&&define.amd&&define([],function(){return n.hljs}))}(function(e){function n(e){return e.replace(/[&<>]/gm,function(e){return I[e]})}function t(e){return e.nodeName.toLowerCase()}function r(e,n){var t=e&&e.exec(n);return t&&0===t.index}function a(e){return k.test(e)}function i(e){var n,t,r,i,o=e.className+" ";if(o+=e.parentNode?e.parentNode.className:"",t=B.exec(o))return R(t[1])?t[1]:"no-highlight";for(o=o.split(/\s+/),n=0,r=o.length;r>n;n++)if(i=o[n],a(i)||R(i))return i}function o(e,n){var t,r={};for(t in e)r[t]=e[t];if(n)for(t in n)r[t]=n[t];return r}function u(e){var n=[];return function r(e,a){for(var i=e.firstChild;i;i=i.nextSibling)3===i.nodeType?a+=i.nodeValue.length:1===i.nodeType&&(n.push({event:"start",offset:a,node:i}),a=r(i,a),t(i).match(/br|hr|img|input/)||n.push({event:"stop",offset:a,node:i}));return 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diff --git a/lib/erl_docgen/priv/xsl/db_html.xsl b/lib/erl_docgen/priv/xsl/db_html.xsl
index 91d830a667..a9f7ff9e5f 100644
--- a/lib/erl_docgen/priv/xsl/db_html.xsl
+++ b/lib/erl_docgen/priv/xsl/db_html.xsl
@@ -659,7 +659,7 @@
           </xsl:otherwise>
         </xsl:choose>
       </head>
-      <body bgcolor="white" text="#000000" link="#0000ff" vlink="#ff00ff" alink="#ff0000">
+      <body>
 
         <div id="container">
           <script id="js" type="text/javascript" language="JavaScript" src="{$topdocdir}/js/flipmenu/flipmenu.js"/>
@@ -734,6 +734,8 @@
           </div>
         </div>
 
+        <script type="text/javascript"><xsl:text>window.__otpTopDocDir = '</xsl:text><xsl:value-of select="$topdocdir"/><xsl:text>/js/';</xsl:text></script>
+        <script type="text/javascript" src="{$topdocdir}/js/highlight.js"/>
       </body>
     </html>
   </xsl:template>