From 3b872067850fcfdc75810f8835089fdc712d00a5 Mon Sep 17 00:00:00 2001
From: Pascal Berger <pascal.berger@gmail.com>
Date: Thu, 15 Nov 2018 11:41:40 +0000
Subject: [PATCH] Add copy functionality to code boxes

---
 slides/img/clippy.svg |  3 ++
 slides/template.html  | 46 ++++++++++++++++++++++++++-
 slides/workshop.css   | 72 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 119 insertions(+), 2 deletions(-)
 create mode 100644 slides/img/clippy.svg

diff --git a/slides/img/clippy.svg b/slides/img/clippy.svg
new file mode 100644
index 0000000..e1b1703
--- /dev/null
+++ b/slides/img/clippy.svg
@@ -0,0 +1,3 @@
+<svg height="1024" width="896" xmlns="http://www.w3.org/2000/svg">
+  <path d="M128 768h256v64H128v-64z m320-384H128v64h320v-64z m128 192V448L384 640l192 192V704h320V576H576z m-288-64H128v64h160v-64zM128 704h160v-64H128v64z m576 64h64v128c-1 18-7 33-19 45s-27 18-45 19H64c-35 0-64-29-64-64V192c0-35 29-64 64-64h192C256 57 313 0 384 0s128 57 128 128h192c35 0 64 29 64 64v320h-64V320H64v576h640V768zM128 256h512c0-35-29-64-64-64h-64c-35 0-64-29-64-64s-29-64-64-64-64 29-64 64-29 64-64 64h-64c-35 0-64 29-64 64z" />
+</svg>
diff --git a/slides/template.html b/slides/template.html
index 13ab47c..5ef7d86 100644
--- a/slides/template.html
+++ b/slides/template.html
@@ -46,7 +46,51 @@
 				]
             });
             Reveal.configure({ slideNumber: 'c/t' });
-			new ClipboardJS('.hljs');
+
+			Reveal.addEventListener( 'ready', function(event){
+				var snippets = document.querySelectorAll('pre > code');
+				[].forEach.call(snippets, function(snippet) {
+					snippet.insertAdjacentHTML("beforebegin", "<button class='btn-copy' data-clipboard-snippet><img class='clippy' width=13 src='/img/clippy.svg' alt='Copy to clipboard'></button>");
+				});
+
+				var clipboardSnippets = new ClipboardJS('[data-clipboard-snippet]', {
+					target: function(trigger) {
+						return trigger.nextElementSibling;
+					}
+				});
+
+				clipboardSnippets.on('success', function(e) {
+					e.clearSelection();
+					showTooltip(e.trigger, "Copied to clipboard");
+				});
+				clipboardSnippets.on('error', function(e) {
+					showTooltip(e.trigger, fallbackMessage(e.action));
+				});
+				var btns = document.querySelectorAll('.btn-copy');
+				for (var i = 0; i < btns.length; i++) {
+					btns[i].addEventListener('mouseleave', function(e) {
+						e.currentTarget.setAttribute('class', 'btn-copy');
+						e.currentTarget.removeAttribute('aria-label');
+					});
+				}
+			});
+
+			function showTooltip(elem, msg) {
+				elem.setAttribute('class', 'btn-copy tooltipped tooltipped-s');
+				elem.setAttribute('aria-label', msg);
+			}
+			function fallbackMessage(action) {
+				var actionMsg = '';
+				var actionKey = (action === 'cut' ? 'X' : 'C');
+				if (/iPhone|iPad/i.test(navigator.userAgent)) {
+					actionMsg = 'No support :(';
+				} else if (/Mac/i.test(navigator.userAgent)) {
+					actionMsg = 'Press ⌘-' + actionKey + ' to ' + action;
+				} else {
+					actionMsg = 'Press Ctrl-' + actionKey + ' to ' + action;
+				}
+				return actionMsg;
+			}
 		</script>
 	</body>
 </html>
diff --git a/slides/workshop.css b/slides/workshop.css
index ec39efa..e858bf7 100644
--- a/slides/workshop.css
+++ b/slides/workshop.css
@@ -62,4 +62,74 @@ body {
   bottom: unset;
   font-size: 16px;
   background-color: #0075BC;
-}
\ No newline at end of file
+}
+
+/* Control the look and feel of the copy box applied to code sections */
+.btn-copy[disabled] .clippy {
+  opacity: .3;
+}
+pre .btn-copy {
+  -webkit-transition: opacity 0.3s ease-in-out;
+  -o-transition: opacity 0.3s ease-in-out;
+  transition: opacity 0.3s ease-in-out;
+  opacity: 0;
+  padding: 2px 6px;
+  float: right;
+}
+pre .btn-copy img {
+  margin: 0;
+  border: 0;
+}
+pre:hover .btn-copy {
+  opacity: 1;
+}
+.tooltipped {
+  position: relative
+}
+.tooltipped:after {
+  position: absolute;
+  z-index: 1000000;
+  display: none;
+  padding: 5px 8px;
+  font: normal normal 11px/1.5 Helvetica, arial, nimbussansl, liberationsans, freesans, clean, sans-serif, "Segoe UI Emoji", "Segoe UI Symbol";
+  color: #fff;
+  text-align: center;
+  text-decoration: none;
+  text-shadow: none;
+  text-transform: none;
+  letter-spacing: normal;
+  word-wrap: break-word;
+  white-space: pre;
+  pointer-events: none;
+  content: attr(aria-label);
+  background: rgba(0, 0, 0, 0.8);
+  border-radius: 3px;
+  -webkit-font-smoothing: subpixel-antialiased
+}
+.tooltipped:before {
+  position: absolute;
+  z-index: 1000001;
+  display: none;
+  width: 0;
+  height: 0;
+  color: rgba(0, 0, 0, 0.8);
+  pointer-events: none;
+  content: "";
+  border: 5px solid transparent
+}
+.tooltipped:hover:before, .tooltipped:hover:after, .tooltipped:active:before, .tooltipped:active:after, .tooltipped:focus:before, .tooltipped:focus:after {
+  display: inline-block;
+  text-decoration: none
+}
+.tooltipped-s:after, .tooltipped-se:after, .tooltipped-sw:after {
+  top: 100%;
+  right: 50%;
+  margin-top: 5px
+}
+.tooltipped-s:before, .tooltipped-se:before, .tooltipped-sw:before {
+  top: auto;
+  right: 50%;
+  bottom: -5px;
+  margin-right: -5px;
+  border-bottom-color: rgba(0, 0, 0, 0.8)
+}