Add a button to copy the "use statement"

src/librustdoc/html/markdown.rs

@@ -1354,6 +1354,7 @@ fn init_id_map() -> FxHashMap<String, usize> {
     map.insert("default-settings".to_owned(), 1);
     map.insert("rustdoc-vars".to_owned(), 1);
     map.insert("sidebar-vars".to_owned(), 1);
+    map.insert("copy-path".to_owned(), 1);
     // This is the list of IDs used by rustdoc sections.
     map.insert("fields".to_owned(), 1);
     map.insert("variants".to_owned(), 1);

src/librustdoc/html/render/print_item.rs

@@ -73,6 +73,7 @@ pub(super) fn print_item(cx: &Context<'_>, item: &clean::Item, buf: &mut Buffer)
         }
     }
     write!(buf, "<a class=\"{}\" href=\"\">{}</a>", item.type_(), item.name.as_ref().unwrap());
+    write!(buf, "<button id=\"copy-path\" onclick=\"copy_path(this)\">⎘</button>");
 
     buf.write_str("</span>"); // in-band
     buf.write_str("<span class=\"out-of-band\">");

src/librustdoc/html/static/main.js

@@ -3061,3 +3061,28 @@ function hideThemeButtonState() {
     window.onhashchange = onHashChange;
     setupSearchLoader();
 }());
+
+function copy_path(but) {
+    var parent = but.parentElement;
+    var path = [];
+
+    onEach(parent.childNodes, function(child) {
+        if (child.tagName === 'A') {
+            path.push(child.textContent);
+        }
+    });
+
+    var el = document.createElement('textarea');
+    el.value = 'use ' + path.join('::') + ';';
+    el.setAttribute('readonly', '');
+    // To not make it appear on the screen.
+    el.style.position = 'absolute';
+    el.style.left = '-9999px';
+
+    document.body.appendChild(el);
+    el.select();
+    document.execCommand('copy');
+    document.body.removeChild(el);
+
+    but.textContent = '✓';
+}

src/librustdoc/html/static/noscript.css

@@ -33,3 +33,8 @@ rules.
 	/* Since there is no toggle (the "[-]") when JS is disabled, no need for this margin either. */
 	margin-left: 0 !important;
 }
+
+#copy-path {
+	/* It requires JS to work so no need to display it in this case. */
+	display: none;
+}

src/librustdoc/html/static/rustdoc.css

@@ -1316,14 +1316,7 @@ h4 > .notable-traits {
 	outline: none;
 }
 
-.help-button {
+#theme-picker, #settings-menu, .help-button, #copy-path {
-	right: 30px;
-	font-family: "Fira Sans", Arial, sans-serif;
-	text-align: center;
-	font-size: 17px;
-}
-
-#theme-picker, #settings-menu, .help-button {
 	padding: 4px;
 	width: 27px;
 	height: 29px;
@@ -1332,6 +1325,22 @@ h4 > .notable-traits {
 	cursor: pointer;
 }
 
+.help-button {
+	right: 30px;
+	font-family: "Fira Sans", Arial, sans-serif;
+	text-align: center;
+	font-size: 17px;
+	padding-top: 2px;
+}
+
+#copy-path {
+	height: 30px;
+	font-size: 18px;
+	margin-left: 10px;
+	padding: 0 6px;
+	width: 28px;
+}
+
 #theme-choices {
 	display: none;
 	position: absolute;

src/librustdoc/html/static/themes/ayu.css

@@ -498,7 +498,7 @@ kbd {
 	box-shadow-color: #c6cbd1;
 }
 
-#theme-picker, #settings-menu, .help-button {
+#theme-picker, #settings-menu, .help-button, #copy-path {
 	border-color: #5c6773;
 	background-color: #0f1419;
 	color: #fff;
@@ -510,7 +510,8 @@ kbd {
 
 #theme-picker:hover, #theme-picker:focus,
 #settings-menu:hover, #settings-menu:focus,
-.help-button:hover, .help-button:focus {
+.help-button:hover, .help-button:focus,
+#copy-path:hover, #copy-path:focus {
 	border-color: #e0e0e0;
 }
 

src/librustdoc/html/static/themes/dark.css

@@ -388,7 +388,7 @@ kbd {
 	box-shadow-color: #c6cbd1;
 }
 
-#theme-picker, #settings-menu, .help-button {
+#theme-picker, #settings-menu, .help-button, #copy-path {
 	border-color: #e0e0e0;
 	background: #f0f0f0;
 	color: #000;
@@ -396,7 +396,8 @@ kbd {
 
 #theme-picker:hover, #theme-picker:focus,
 #settings-menu:hover, #settings-menu:focus,
-.help-button:hover, .help-button:focus {
+.help-button:hover, .help-button:focus,
+#copy-path:hover, #copy-path:focus {
 	border-color: #ffb900;
 }
 

src/librustdoc/html/static/themes/light.css

@@ -380,14 +380,15 @@ kbd {
 	box-shadow-color: #c6cbd1;
 }
 
-#theme-picker, #settings-menu, .help-button {
+#theme-picker, #settings-menu, .help-button, #copy-path {
 	border-color: #e0e0e0;
 	background-color: #fff;
 }
 
 #theme-picker:hover, #theme-picker:focus,
 #settings-menu:hover, #settings-menu:focus,
-.help-button:hover, .help-button:focus {
+.help-button:hover, .help-button:focus,
+#copy-path:hover, #copy-path:focus {
 	border-color: #717171;
 }