Merge pull request mermaid-js#584 from skrobul/kroki-support

Kroki support

README.md

@@ -32,6 +32,11 @@ docker run --publish 8000:80 ghcr.io/mermaid-js/mermaid-live-editor
 When building, Set the Environment variable MERMAID_RENDERER_URL to the rendering service.
 Default is `https://mermaid.ink`
 
+### To configure Kroki Instance URL
+
+When building, Set the Environment variable MERMAID_KROKI_RENDERER_URL to your Kroki instance.
+Default is `https://kroki.io`
+
 ### Development
 
 ```bash

package.json

@@ -57,6 +57,7 @@
 		"mermaid": "8.13.8",
 		"moment": "^2.29.1",
 		"monaco-editor": "^0.31.1",
+		"pako": "1.0.10",
 		"random-word-slugs": "^0.1.6"
 	},
 	"lint-staged": {

src/lib/components/actions.svelte

@@ -2,10 +2,11 @@
 	import { browser } from '$app/env';
 
 	import Card from '$lib/components/card/card.svelte';
-	import { rendererUrl } from '$lib/util/env';
+	import { rendererUrl, krokiRendererUrl } from '$lib/util/env';
 	import { base64State, codeStore } from '$lib/util/state';
-	import { toBase64 } from 'js-base64';
+	import { toBase64, btoa as jsbtoa } from 'js-base64';
 	import moment from 'moment';
+	import pako from 'pako';
 
 	type Exporter = (context: CanvasRenderingContext2D, image: HTMLImageElement) => () => void;
 
@@ -127,6 +128,31 @@
 		window.location.href = `${window.location.pathname}?gist=${gistURL}`;
 	};
 
+	const textEncode = (str) => {
+		if (window.TextEncoder) {
+			return new TextEncoder('utf-8').encode(str);
+		}
+		let utf8 = unescape(encodeURIComponent(str));
+		let result = new Uint8Array(utf8.length);
+		for (let i = 0; i < utf8.length; i++) {
+			result[i] = utf8.charCodeAt(i);
+		}
+		return result;
+	};
+
+	const onKrokiClick = () => {
+		const krokiCode = getKrokiCode($codeStore.code);
+		const krokiUrl = `${krokiRendererUrl}/mermaid/svg/${krokiCode}`;
+		return window.open(krokiUrl, '_blank');
+	};
+
+	const getKrokiCode = (source) => {
+		const data = textEncode(source);
+		const compressed = pako.deflate(data, { level: 9, to: 'string' });
+		let result = jsbtoa(compressed).replace(/\+/g, '-').replace(/\//g, '_');
+		return result;
+	};
+
 	let iUrl: string;
 	let svgUrl: string;
 	let mdCode: string;
@@ -168,6 +194,9 @@
 		<button class="action-btn flex-auto">
 			<a target="_blank" href={svgUrl}><i class="fas fa-external-link-alt mr-2" /> SVG</a>
 		</button>
+		<button class="action-btn flex-auto" on:click={onKrokiClick}>
+			<i class="fas fa-external-link-alt mr-2" /> Kroki
+		</button>
 
 		<div class="flex gap-2 items-center">
 			PNG size

src/lib/util/env.ts

@@ -1 +1,2 @@
 export const rendererUrl = import.meta.env.MERMAID_RENDERER_URL ?? 'https://mermaid.ink';
+export const krokiRendererUrl = import.meta.env.MERMAID_KROKI_RENDERER_URL ?? 'https://kroki.io';

yarn.lock

@@ -3405,6 +3405,11 @@ p-map@^4.0.0:
   dependencies:
     aggregate-error "^3.0.0"
 
+[email protected]:
+  version "1.0.10"
+  resolved "https://registry.yarnpkg.com/pako/-/pako-1.0.10.tgz#4328badb5086a426aa90f541977d4955da5c9732"
+  integrity sha512-0DTvPVU3ed8+HNXOu5Bs+o//Mbdj9VNQMUOe9oKCwh8l0GNwpTDMKCWbRjgtD291AWnkAgkqA/LOnQS8AmS1tw==
+
 parent-module@^1.0.0:
   version "1.0.1"
   resolved "https://registry.npmjs.org/parent-module/-/parent-module-1.0.1.tgz"