add typo and a blinky cursor to tagline messages

assets/js/typo.js

@@ -0,0 +1,195 @@
+/*
+
+Typo, a more natural web typing thing
+
+https://neatnik.net/typo
+https://github.com/neatnik/typo
+
+Copyright (c) 2021 Neatnik LLC
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+*/
+
+function num_between(min, max) {
+	return Math.floor(Math.random() * (max- min + 1) + min);
+}
+
+function chance(val) {
+	if(num_between(0, 100) < val) return true;
+	else return false;
+}
+
+function sleep(ms) {
+	return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+var typos = {
+	q:['w','a'],
+	w:['q','r','s'],
+	e:['w','d','r'],
+	r:['e','f','t'],
+	t:['r','g','y'],
+	y:['t','h','u'],
+	u:['y','j','i'],
+	i:['u','k','o'],
+	o:['i','l','p'],
+	p:['o',';','['],
+	a:['q','s','z'],
+	s:['w','a','x','d'],
+	d:['e','s','c','f'],
+	f:['r','d','v','g'],
+	g:['t','f','b','h'],
+	h:['y','g','n','j'],
+	j:['u','h','m','k'],
+	k:['i','j',',','l'],
+	l:['o','k','.',';'],
+	z:['a','x'],
+	x:['z','s','c'],
+	c:['x','d','v'],
+	v:['c','f','b'],
+	b:['v','g','n'],
+	n:['b','h','m'],
+	m:['n','j',','],
+}
+
+async function typo(element, text) {
+	var buffer = '';
+	var typo_active = false;
+	var tag_active = false;
+	var typing_typos = (element.dataset.typoChance) ? element.dataset.typoChance : 10;
+	var typing_speed = (element.dataset.typingDelay) ? element.dataset.typingDelay : 50;
+	var typing_jitter = (element.dataset.typingJitter) ? element.dataset.typingJitter : 15;
+
+	for (var i = 0; i < text.length; i++) {
+
+		// Get the letter that we’re supposed to type
+		letter = text.charAt(i);
+
+		// TODO: actual support for html or markup or whatever
+
+		/*
+		// Handle elements/markup
+		if(letter == '<' && (
+			text.charAt(i+1) == 's' ||
+			text.charAt(i+1) == 'p' ||
+			text.charAt(i+1) == 'a' ||
+			text.charAt(i+1) == '/' ||
+			text.charAt(i+1) == 'i')
+		) {
+			tag_active = true;
+		}
+
+		if(tag_active) {
+
+			buffer = buffer + letter;
+			element.innerHTML = buffer;
+
+			if(letter == '>' && (
+				text.charAt(i-1) == 'n' ||
+				text.charAt(i-1) == 'a' ||
+				text.charAt(i-1) == 'p' ||
+				text.charAt(i+1) == '"' ||
+				text.charAt(i+1) == '/')
+			) {
+				tag_active = false;
+				await sleep(typing_speed);
+			}
+			continue;
+		}
+		*/
+
+		// Trigger a typo
+		if(chance(typing_typos) && typo_active === false && i > 1) {
+
+			if(typeof typos[letter] !== 'undefined') {
+
+				// Swap the letter with a random typo
+				typo = typos[letter][Math.floor(Math.random() * typos[letter].length)];
+
+				// Append the letter to the buffer
+				buffer = buffer + typo;
+
+				// Write the buffer
+				element.innerHTML = buffer;
+
+				typo_active = true;
+				var seed = num_between(2,5);
+				realization_delay = seed;
+				realization_delay_counter = seed;
+			}
+		}
+
+		// Append the letter to the buffer
+		buffer = buffer + letter;
+
+		// Write the buffer
+		element.innerHTML = buffer;
+
+		// Typical typing speed
+		var speed_lower = parseFloat(typing_speed) - parseInt(typing_jitter);
+		var speed_upper = parseFloat(typing_speed) + parseInt(typing_jitter);
+
+		delay = num_between(speed_lower,speed_upper);
+
+		// Chance of longer delay though
+		if(chance(5)) delay = num_between(100, 200);
+		await sleep(delay);
+
+		if(typo_active) {
+
+			realization_delay_counter--;
+
+			if(realization_delay_counter == 0) {
+
+				for (var k = 0; k < seed+1; k++) {
+
+					// Pause at realization of typo
+					await sleep(typing_jitter);
+
+					// Rewind the buffer!
+					buffer = buffer.substring(0, buffer.length - 1);
+
+					// Write rewound buffer
+					element.innerHTML = buffer;
+
+					// Brief pause before continuing
+					await sleep(30);
+				}
+
+				typo_active = false;
+
+				// Add the letters back
+				i = i - seed;
+				await sleep(100);
+			}
+		}
+	}
+
+	// Whatever you do here will happen when the typing is finished
+	//do_something();
+
+	return new Promise(resolve => setTimeout(resolve, 1));
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+	var element = document.getElementById('tagline');
+	var text = element.innerHTML;
+	typo(element, text);
+});

layouts/partials/head.html

@@ -49,3 +49,7 @@
   {{ $copyCss := resources.Get "css/code-copy-button.css" | minify }}
   <link href="{{ $copyCss.RelPermalink }}" rel="stylesheet">
 {{ end }}
+
+<!-- typo text animation -->
+{{ $jsTypo := resources.Get "js/typo.js" | minify }}
+<script src="{{ $jsTypo.RelPermalink }}"></script>

layouts/partials/tagline.html

@@ -4,9 +4,11 @@
 <script language="Javascript" type="text/javascript">
   var taglines = JSON.parse(document.getElementsByTagName("meta")["taglines"].content);
   function getTagline() {
-    var randIndex = Math.floor(Math.random() * taglines.length);
+    const randIndex = Math.floor(Math.random() * taglines.length);
-    document.getElementById("tagline").innerHTML = taglines[randIndex];
+    const element = document.getElementById("tagline");
+    element.innerHTML = taglines[randIndex];
+    typo(element, element.innerHTML);
   }
   window.addEventListener("pageshow", getTagline);
 </script>
-<div><i id="tagline"></i></div>
+<div style="height: 3.5rem;"><i id="tagline" data-typo-chance="2" data-typing-delay="40" data-typing-jitter="20"></i></div>

static/css/custom.css

@@ -402,3 +402,22 @@ p:has(+ ol),
 p:has(+ ul) {
   margin-bottom: 0;
 }
+
+/* tagline cursor animation */
+#tagline::after {
+  content: "";
+  width: 0.5rem;
+  height: 1.2rem;
+  background: var(--muted);
+  display: inline-block;
+  margin-left: 0.2rem;
+  vertical-align: text-bottom;
+  animation: cursor-blink 1.5s steps(2) infinite;
+}
+
+@keyframes cursor-blink {
+  0% {
+    opacity: 0;
+  }
+}
+