NO FUSS NO MUSS

assets/encode.js

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+/** Functions from https://plantuml.com/code-javascript-synchronous
+ */
+
+function encode64(data) {
+	r = "";
+	for (i=0; i<data.length; i+=3) {
+ 		if (i+2==data.length) {
+			r +=append3bytes(data.charCodeAt(i), data.charCodeAt(i+1), 0);
+		} else if (i+1==data.length) {
+			r += append3bytes(data.charCodeAt(i), 0, 0);
+		} else {
+			r += append3bytes(data.charCodeAt(i), data.charCodeAt(i+1),
+				data.charCodeAt(i+2));
+		}
+	}
+	return r;
+}
+
+function append3bytes(b1, b2, b3) {
+	c1 = b1 >> 2;
+	c2 = ((b1 & 0x3) << 4) | (b2 >> 4);
+	c3 = ((b2 & 0xF) << 2) | (b3 >> 6);
+	c4 = b3 & 0x3F;
+	r = "";
+	r += encode6bit(c1 & 0x3F);
+	r += encode6bit(c2 & 0x3F);
+	r += encode6bit(c3 & 0x3F);
+	r += encode6bit(c4 & 0x3F);
+	return r;
+}
+
+function encode6bit(b) {
+	if (b < 10) {
+ 		return String.fromCharCode(48 + b);
+	}
+	b -= 10;
+	if (b < 26) {
+ 		return String.fromCharCode(65 + b);
+	}
+	b -= 26;
+	if (b < 26) {
+ 		return String.fromCharCode(97 + b);
+	}
+	b -= 26;
+	if (b == 0) {
+ 		return '-';
+	}
+	if (b == 1) {
+ 		return '_';
+	}
+	return '?';
+}

assets/plantuml_codeblock_parse.js

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+/* Copyright (C) 2020 David Svantesson
+ * MIT License
+ *
+ */
+
+function parsePlantumlCodeBlocks(plantumlServer = "http://www.plantuml.com/plantuml", htmlClass = "language-plantuml") {
+	var codeBlocks = document.getElementsByClassName(htmlClass);
+
+	for (var block_i = 0; block_i < codeBlocks.length; block_i++) {
+		block_string = codeBlocks[block_i].innerText
+		//UTF8
+		block_string = unescape(encodeURIComponent(block_string));
+		codeBlocks[block_i].innerHTML = "<img src=\"" + plantumlServer + "/img/" + encode64(zip_deflate(block_string, 9)) + "\">";
+	}
+	
+}
+

footer.tmpl

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+<script>
+  $(async () => {
+    if (!$('.language-plantuml').length) return;
+    await Promise.all([
+      $.getScript('https://gitea.dmz.rs/disu1950/android-toolz/assets/deflate.js'),
+      $.getScript('https://gitea.dmz.rs/disu1950/android-toolz/assets/encode.js'),
+      $.getScript('https://gitea.dmz.rs/disu1950/android-toolz/assets/plantuml_codeblock_parse.js'),
+    ]);
+    // Replace call with address to your plantuml server
+    parsePlantumlCodeBlocks("https://www.plantuml.com/plantuml");
+  });
+</script>