Add link previews on hover

_includes/footer.html

@@ -1 +1 @@
-This is the footer. Include anything you'd like here, like a link to an <a href="/about">About</a> page.
+This is the footer. Include anything you'd like here, like a link to an <a class="internal-link" href="/about">About</a> page.

_includes/link-previews.html

@@ -0,0 +1,119 @@
+<!-- That file is not particularly elegant. This will need a refactor at some point. -->
+<style>
+  content a.internal-link {
+    border-color: #8b88e6;
+  }
+
+  #tooltip-wrapper {
+    background: white;
+    padding: 1em;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    overflow: hidden;
+    position: absolute;
+    width: 400px;
+    height: 250px;
+    font-size: 0.8em;
+    box-shadow: 0 5px 10px rgba(0,0,0,0.1);
+    opacity: 0;
+    transition: opacity 100ms;
+  }
+
+  #tooltip-wrapper:after {
+		content: "";
+		position: absolute;
+		z-index: 1;
+		bottom: 0;
+		left: 0;
+		pointer-events: none;
+		background-image: linear-gradient(to bottom, rgba(255,255,255, 0), rgba(255,255,255, 1) 90%);
+		width: 100%;
+		height: 75px;
+  }
+</style>
+
+<div style="opacity: 0; display: none;" id='tooltip-wrapper'>
+  <div id='tooltip-content'>
+  </div>
+</div>
+
+<iframe style="display: none; height: 0; width: 0;" id='link-preview-iframe' src="">
+</iframe>
+
+<script>
+  var opacityTimeout;
+  var contentTimeout;
+  var transitionDurationMs = 100;
+
+  var iframe = document.getElementById('link-preview-iframe')
+  var tooltipWrapper = document.getElementById('tooltip-wrapper')
+  var tooltipContent = document.getElementById('tooltip-content')
+
+  function hideTooltip() {
+    opacityTimeout = setTimeout(function() {
+      tooltipWrapper.style.opacity = 0;
+      contentTimeout = setTimeout(function() {
+        tooltipContent.innerHTML = '';
+        tooltipWrapper.style.display = 'none';
+      }, transitionDurationMs + 1);
+    }, transitionDurationMs)
+  }
+
+  function showTooltip(event) {
+    var elem = event.target;
+    var elem_props = elem.getClientRects()[elem.getClientRects().length - 1];
+    var top = window.pageYOffset || document.documentElement.scrollTop
+
+    if (event.target.host === window.location.host) {
+      iframe.src = event.target.href
+      iframe.onload = function() {
+        tooltipContentHtml = ''
+        tooltipContentHtml += '<div style="font-weight: bold;">' + iframe.contentWindow.document.querySelector('h1').innerHTML + '</div>'
+        tooltipContentHtml += iframe.contentWindow.document.querySelector('content').innerHTML
+
+        tooltipContent.innerHTML = tooltipContentHtml
+
+        tooltipWrapper.style.display = 'block';
+        setTimeout(function() {
+          tooltipWrapper.style.opacity = 1;
+        }, 1)
+      }
+
+      tooltipWrapper.style.left = elem_props.left - (tooltipWrapper.offsetWidth / 2) + (elem_props.width / 2) + "px";
+      if ((window.innerHeight - elem_props.top) < (tooltipWrapper.offsetHeight)) {
+          tooltipWrapper.style.top = elem_props.top + top - tooltipWrapper.offsetHeight - 10 + "px";
+      } else if ((window.innerHeight - elem_props.top) > (tooltipWrapper.offsetHeight)) {
+          tooltipWrapper.style.top = elem_props.top + top + 35 + "px";
+      }
+
+      if ((elem_props.left + (elem_props.width / 2)) < (tooltipWrapper.offsetWidth / 2)) {
+          tooltipWrapper.style.left = "10px";
+      } else if ((document.body.clientWidth - elem_props.left - (elem_props.width / 2)) < (tooltipWrapper.offsetWidth / 2)) {
+          tooltipWrapper.style.left = document.body.clientWidth - tooltipWrapper.offsetWidth - 20 + "px";
+      }
+    }
+  }
+
+  function setupListeners(linkElement) {
+    linkElement.addEventListener('mouseleave', function(_event) {
+      hideTooltip();
+    });
+
+    tooltipWrapper.addEventListener('mouseleave', function(_event) {
+      hideTooltip();
+    });
+
+    linkElement.addEventListener('mouseenter', function(event) {
+      clearTimeout(opacityTimeout);
+      clearTimeout(contentTimeout);
+      showTooltip(event);
+    });
+
+    tooltipWrapper.addEventListener('mouseenter', function(event) {
+      clearTimeout(opacityTimeout);
+      clearTimeout(contentTimeout);
+    });
+  }
+
+  document.querySelectorAll('{{ include.wrapperQuerySelector }} a').forEach(setupListeners);
+</script>

_includes/nav.html

@@ -1,3 +1,3 @@
 <div>
-    <a href="/"><b>{{ site.title }}</b></a>
+    <a class="internal-link" href="/"><b>{{ site.title }}</b></a>
 </div>

_layouts/default.html

@@ -7,5 +7,7 @@
       <main>{{ content }}</main>
       <footer>{% include footer.html %}</footer>
     </div>
+
+    {% include link-previews.html wrapperQuerySelector="content" %}
   </body>
 </html>

_layouts/note.html

@@ -22,7 +22,7 @@ layout: default
       <div style="display: grid; grid-gap: 1em; grid-template-columns: repeat(1fr);">
       {% for backlink in page.backlinks %}
         <div class="backlink-box">
-        <a href="{{ backlink.url }}">{{ backlink.title }}</a><br>
+        <a class="internal-link" href="{{ backlink.url }}">{{ backlink.title }}</a><br>
         <div style="font-size: 0.9em">{{ backlink.excerpt | strip_html | truncatewords: 20 }}</div>
         </div>
       {% endfor %}
@@ -37,5 +37,5 @@ layout: default
       {% endif %}
     </side>
   </div>
-
 </article>
+

_layouts/page.html

@@ -0,0 +1,7 @@
+---
+layout: default
+---
+
+<content>
+  {{ content }}
+</content>

_notes/consistency.md

@@ -4,4 +4,4 @@ title: Consistency is key
 
 Show up. Do the work. Be consistent.
 
-Then go take a look at the [first note](/your-first-note).
+Then go take a look at the [first note](/your-first-note){: .internal-link}.

_notes/your-first-note.md

@@ -3,14 +3,36 @@ title: Your first seed
 image: /assets/image.jpg
 ---
 
-This is your first note.
+### Welcome!
 
-To link to another note, use regular Markdown syntax for links, with a relative link to the other note, like this: [this is a link to a note about cats](/cats).
+This is your first note. You'll find it in the `notes/` directory.
 
-You can also use Roam-style link syntax by wrapping a note's title in double brackets, like this: [[A note about cats]]. If the Roam-style link does not point to a valid note's title, the double brackets will still be shown, like this: [[This note does not exist]].
+### Link syntax
+
+To link to another note, you can use regular [Markdown syntax](https://www.markdownguide.org/getting-started/) for links, with a relative link to the other note, like this: [this is a link to a note about cats](/cats){: .internal-link}. Don't forget to use the `.internal-link` class to make sure the link is styled as an internal link.
+
+Since the Web is all about HTML, you can always use plain HTML if you want, like this: <a class="internal-link" href="/cats">This is the same note about cats as above</a>.
+
+Of course, you can also link to external websites, like this: [this is a link to Wikipedia](https://wikipedia.org/). Again, you can use plain HTML if you prefer.
+
+Additionally, you can use Roam/wiki-style link syntax by wrapping a note's title in double brackets, like this: [[A note about cats]]. If the Roam-style link does not point to a valid note's title, the double brackets will still be shown, like this: [[There is no note with this title]].
+
+### Automatic bi-directional links
 
 Notice in the "Notes mentioning this note" section that there is another note linking to this note. This is a bi-directional link, and those are automatically created when you create links to other notes.
 
-You can display images using Markdown's image tag, like this:
+### Link previews
+
+If you're on a device with mouse support, try hovering your mouse on internal links to preview the notes: [[A note about cats]]
+
+### Images
+
+Finally, you can display images using Markdown syntax, like this:
 
 ![]({{page.image}})
+
+### Next steps
+
+If this template is useful to you in any way, consider [donating](https://github.com/sponsors/maximevaillancourt) to support my work.
+
+Go forth, have fun, and learn new something every day! ✌️

_pages/about.md

@@ -1,9 +1,9 @@
 ---
-layout: default
+layout: page
 title: About
 permalink: /about
 ---
 
 *This is an about page.*
 
-Feel free to tell the world about what you love! 😍
+Feel free to tell the world about what you love! 😍

_pages/index.md

@@ -1,11 +1,10 @@
 ---
-layout: default
+layout: page
 title: Home
 id: home
 permalink: /
 ---
 
-<div>
-  <h1>Welcome! 🌱</h1>
-  <p>This is your digital garden. Here's [[Your first seed]] to get started on your exploration.</p>
-</div>
+# Welcome! 🌱
+
+This is your digital garden. Here's [[Your first seed]] to get started on your exploration.

_sass/_style.scss

@@ -83,6 +83,16 @@ a {
     color: black !important;
     background: #fffaf1;
   }
+  &:after {
+    position: relative;
+    top: -0.5em;
+    font-size: 0.7em;
+    content: "↗";
+    color: #aaaaaa;
+  }
+  &.internal-link:after {
+    content: "";
+  }
 }
 
 *:focus {
@@ -116,3 +126,9 @@ ul {
   padding: 1em;
   border-radius: $border-radius;
 }
+
+code {
+  background: #f5f5f5;
+  padding: 0.1em 0.2em;
+  border-radius: 4px;
+}