Add "edit on github" links to doc pages

Author: felixmulder

doc-tool/resources/_layouts/doc-page.html

@@ -13,6 +13,9 @@
     {% include "sidebar" %}
 
     <div id="content-body" class="doc-page-body">
+        <a id="edit-on-github" href="{{ site.projectUrl }}/edit/master/{{ site.root }}/{{ page.url }}">
+            Edit this page on GitHub
+        </a>
         <h1 id="doc-page-title">{{ page.title }}</h1>
         <hr/>
         <div id="doc-page-container">

doc-tool/resources/css/dottydoc.css

@@ -1,4 +1,5 @@
 @import url(https://fonts.googleapis.com/css?family=Source+Sans+Pro:200,300,400,600,700);
+@import url(https://fonts.googleapis.com/css?family=Titillium+Web:200,300,400,600);
 @import url(https://fonts.googleapis.com/css?family=Roboto+Slab:100,300,400,700);
 
 html, body {
@@ -34,6 +35,24 @@ div#content-wrapper div#content-body {
             transition: all .25s ease-out;
 }
 
+div#content-body > a#edit-on-github {
+    border-left: 1px solid #fff;
+    position: absolute;
+    top: 47px;
+    padding-left: 10px;
+    right: 250px;
+    font-size: 14px;
+    color: #373a3c;
+    font-family: "Titillium Web", sans-serif;
+    text-transform: uppercase;
+}
+
+div#content-body > a#edit-on-github:hover,
+div#content-body > a#edit-on-github:focus {
+    text-decoration: none;
+    border-left: 1px solid #0fa00f;
+}
+
 div#content-wrapper button#menu-toggle {
     background: rgba(244, 243, 244, 0.4) none;
     border: 1px solid transparent;

doc-tool/src/dotty/tools/dottydoc/staticsite/DefaultParams.scala

@@ -39,7 +39,8 @@ case class DefaultParams(
         "posts" -> site.posts.map(_.toMap),
         "project" -> site.projectTitle,
         "version" -> site.projectVersion,
-        "projectUrl" -> site.projectUrl
+        "projectUrl" -> site.projectUrl,
+        "root" -> site.root
       ).asJava,
 
       "sidebar" -> sidebar.titles.asJava
@@ -55,7 +56,7 @@ case class DefaultParams(
 
   def withPosts(posts: Array[BlogPost]): DefaultParams =
     copy(site = SiteInfo(
-      site.baseurl, site.projectTitle, site.projectVersion, site.projectUrl, posts))
+      site.baseurl, site.projectTitle, site.projectVersion, site.projectUrl, posts, site.root))
 
   def withUrl(url: String): DefaultParams =
     copy(page = PageInfo(url))
@@ -74,7 +75,8 @@ case class SiteInfo(
   projectTitle: String,
   projectVersion: String,
   projectUrl: String,
-  posts: Array[BlogPost]
+  posts: Array[BlogPost],
+  root: String
 )
 
 case class Sidebar(titles: List[Title])

doc-tool/src/dotty/tools/dottydoc/staticsite/Site.scala

@@ -172,7 +172,10 @@ case class Site(
 
     DefaultParams(
       docs, docsFlattened, documentation, PageInfo(pathFromRoot),
-      SiteInfo(baseUrl, projectTitle, projectVersion, projectUrl, Array()),
+      SiteInfo(
+        baseUrl, projectTitle, projectVersion, projectUrl, Array(),
+        root.toString
+      ),
       sidebar
     )
   }
@@ -290,7 +293,7 @@ case class Site(
     * // given that root is: /some/root
     * ```
     */
-  def stripRoot(f: JFile): String = {
+  def stripRoot(f: JFile, root: JFile = root): String = {
     val rootLen = root.getAbsolutePath.length + 1
     f.getAbsolutePath.drop(rootLen)
   }

doc-tool/test/dotty/tools/dottydoc/staticsite/SiteTests.scala

@@ -78,8 +78,8 @@ class SiteTests extends DottyDocTest with SourceFileOps {
   }
 
   @Test def siteStructure = {
-    val assets = site.staticAssets.map(site.stripRoot).toSet
-    val compd  = site.compilableFiles.map(site.stripRoot).toSet
+    val assets = site.staticAssets.map(site.stripRoot(_)).toSet
+    val compd  = site.compilableFiles.map(site.stripRoot(_)).toSet
 
     val expectedAssets = Set(
       "css/toolbar.css",