From cc3f4fabc2b49579f74d5d75dcb5d80ef1904d40 Mon Sep 17 00:00:00 2001
From: Sidharth Vinod <sidharthv96@gmail.com>
Date: Sat, 5 Jun 2021 15:31:22 +0530
Subject: [PATCH] Loading Gist

---
 src/app.postcss                    |  4 +++
 src/lib/components/actions.svelte  | 43 +++++++++++++++++++++++++-----
 src/lib/types.d.ts                 |  4 +++
 src/lib/util/fileLoaders/gist.ts   | 12 +++++++--
 src/lib/util/fileLoaders/loader.ts | 10 ++++---
 src/lib/util/loading.ts            | 19 +++++++++++++
 src/lib/util/util.ts               |  3 ++-
 src/routes/__layout.svelte         | 42 +++++++++++++++++++++++++++++
 8 files changed, 125 insertions(+), 12 deletions(-)
 create mode 100644 src/lib/util/loading.ts

diff --git a/src/app.postcss b/src/app.postcss
index ce6711bb..edf491bf 100644
--- a/src/app.postcss
+++ b/src/app.postcss
@@ -12,3 +12,7 @@
 .action-btn {
 	@apply rounded p-2 bg-indigo-400 shadow flex-auto text-white hover:bg-indigo-500;
 }
+
+.input {
+	@apply flex-1 border-indigo-400 border-solid border-2 rounded;
+}
diff --git a/src/lib/components/actions.svelte b/src/lib/components/actions.svelte
index a119c4d5..ef3c03b4 100644
--- a/src/lib/components/actions.svelte
+++ b/src/lib/components/actions.svelte
@@ -1,7 +1,8 @@
 <script lang="ts">
+	import { goto } from '$app/navigation';
 	import Card from '$lib/components/card/card.svelte';
 	import type { State } from '$lib/types';
-	import { base64State, codeStore } from '$lib/util/state';
+	import { codeStore } from '$lib/util/state';
 	import { toBase64 } from 'js-base64';
 	import moment from 'moment';
 
@@ -103,11 +104,27 @@
 		);
 	};
 
-	const onCopyMarkdown = (event: Event) => {
-		event.target.select();
+	const onCopyMarkdown = () => {
+		document.getElementById('markdown').select();
 		document.execCommand('Copy');
 	};
 
+	let gistURL = '';
+	codeStore.subscribe((state) => {
+		if (state.loader?.type === 'gist') {
+			// @ts-ignore Gist will have url
+			gistURL = state.loader.config.url;
+		}
+	});
+
+	const loadGist = () => {
+		if (!gistURL) {
+			alert('Please enter a Gist URL first');
+		}
+		goto(`/edit?gist=${gistURL}`);
+		location.reload();
+	};
+
 	let iUrl: string;
 	let svgUrl: string;
 	let mdCode: string;
@@ -126,7 +143,7 @@
 	});
 </script>
 
-<Card title="Actions" isOpen={false}>
+<Card title="Actions" isOpen={true}>
 	<div class="flex flex-wrap gap-2 m-2">
 		{#if isClipboardAvailable()}
 			<button class="action-btn w-full" on:click={onCopyClipboard}
@@ -160,8 +177,22 @@
 		</div>
 
 		<div class="w-full flex gap-2 items-center">
-			<label for="markdown">Copy Markdown</label>
-			<input class="flex-1" id="markdown" type="text" value={mdCode} on:click={onCopyMarkdown} />
+			<input class="input" id="markdown" type="text" value={mdCode} on:click={onCopyMarkdown} />
+			<label for="markdown">
+				<button class="btn text-white flex-auto" on:click={onCopyMarkdown}> Copy Markdown </button>
+			</label>
+		</div>
+
+		<div class="w-full flex gap-2 items-center">
+			<input
+				class="input"
+				id="gist"
+				type="text"
+				bind:value={gistURL}
+				placeholder="Enter Gist URL" />
+			<label for="gist">
+				<button class="btn text-white flex-auto" on:click={loadGist}> Load Gist </button>
+			</label>
 		</div>
 	</div>
 </Card>
diff --git a/src/lib/types.d.ts b/src/lib/types.d.ts
index 3969b14d..e0a139b3 100644
--- a/src/lib/types.d.ts
+++ b/src/lib/types.d.ts
@@ -36,6 +36,10 @@ export interface GistLoaderConfig {
 	url: string;
 }
 
+export interface LoadingState {
+	loading: boolean;
+	message?: string;
+}
 export interface FileLoaderConfig {
 	codeURL: string;
 	configURL?: string;
diff --git a/src/lib/util/fileLoaders/gist.ts b/src/lib/util/fileLoaders/gist.ts
index 6153b4b7..880032d9 100644
--- a/src/lib/util/fileLoaders/gist.ts
+++ b/src/lib/util/fileLoaders/gist.ts
@@ -55,9 +55,15 @@ const getGistData = async (gistURL: string): Promise<GistData> => {
 };
 
 const getStateFromGist = (gist: GistData): State => {
-	const state = {
+	const state: State = {
 		...defaultState,
-		code: gist.code
+		code: gist.code,
+		loader: {
+			type: 'gist',
+			config: {
+				url: gist.url
+			}
+		}
 	};
 	gist.config && (state.mermaid = gist.config);
 	return state;
@@ -81,6 +87,8 @@ export const loadGistData = async (gistURL: string): Promise<State> => {
 		}
 		gistHistory.reverse();
 		const state = getStateFromGist(gistHistory.slice(-1).pop());
+		// @ts-ignore Ignore
+		state.loader.config.url = gistURL;
 		for (const gist of gistHistory) {
 			addHistoryEntry({
 				state: getStateFromGist(gist),
diff --git a/src/lib/util/fileLoaders/loader.ts b/src/lib/util/fileLoaders/loader.ts
index 5a04b2a7..c9a04184 100644
--- a/src/lib/util/fileLoaders/loader.ts
+++ b/src/lib/util/fileLoaders/loader.ts
@@ -7,7 +7,7 @@ const loaders: Record<string, Loader> = {
 
 export const loadDataFromUrl = async (): Promise<void> => {
 	const searchParams = new URLSearchParams(window.location.search);
-	let state: State;
+	let state: State = defaultState;
 	let code: string, config: string;
 	const codeURL: string = searchParams.get('code');
 	const configURL: string = searchParams.get('config');
@@ -23,8 +23,12 @@ export const loadDataFromUrl = async (): Promise<void> => {
 	if (!code) {
 		for (const [key, value] of searchParams.entries()) {
 			if (key in loaders) {
-				state = await loaders[key](value);
-				break;
+				try {
+					state = await loaders[key](value);
+					break;
+				} catch (err) {
+					console.error(err);
+				}
 			}
 		}
 	} else {
diff --git a/src/lib/util/loading.ts b/src/lib/util/loading.ts
new file mode 100644
index 00000000..84205ebf
--- /dev/null
+++ b/src/lib/util/loading.ts
@@ -0,0 +1,19 @@
+import { writable, Writable } from 'svelte/store';
+import type { LoadingState } from '$lib/types';
+
+const defaultLoading: LoadingState = {
+	loading: false
+};
+
+export const loadingStateStore: Writable<LoadingState> = writable(defaultLoading);
+export const initLoading = async <T>(message: string, task: Promise<T>): Promise<T> => {
+	loadingStateStore.set({
+		loading: true,
+		message
+	});
+	const result: T = await task;
+	loadingStateStore.set({
+		loading: false
+	});
+	return result;
+};
diff --git a/src/lib/util/util.ts b/src/lib/util/util.ts
index f244f9ff..84e02992 100644
--- a/src/lib/util/util.ts
+++ b/src/lib/util/util.ts
@@ -2,6 +2,7 @@ import type { State } from '$lib/types';
 import { initURLSubscription, loadState, updateCodeStore } from './state';
 import { analytics, initAnalytics } from './stats';
 import { loadDataFromUrl } from './fileLoaders/loader';
+import { initLoading } from './loading';
 
 export const loadStateFromURL = (): void => {
 	loadState(window.location.hash.slice(1));
@@ -15,7 +16,7 @@ export const syncDiagram = (): void => {
 
 export const initHandler = async (): Promise<void> => {
 	loadStateFromURL();
-	await loadDataFromUrl().catch(console.error);
+	await initLoading('Loading Gist...', loadDataFromUrl().catch(console.error));
 	syncDiagram();
 	initURLSubscription();
 	await initAnalytics();
diff --git a/src/routes/__layout.svelte b/src/routes/__layout.svelte
index f17b2f6e..92cf8996 100644
--- a/src/routes/__layout.svelte
+++ b/src/routes/__layout.svelte
@@ -2,6 +2,7 @@
 	import '../app.postcss';
 	import { base } from '$app/paths';
 	import { onMount } from 'svelte';
+	import { loadingStateStore } from '$lib/util/loading';
 	// This can be removed once https://github.com/sveltejs/kit/issues/1612 is fixed.
 	// Then move it into src and vite will bundle it automatically.
 	onMount(() => {
@@ -23,3 +24,44 @@
 <main class="h-screen">
 	<slot />
 </main>
+
+{#if $loadingStateStore.loading}
+	<div
+		class="w-screen h-screen z-50 absolute left-0 top-0 bg-gray-600 opacity-50 flex align-middle justify-center">
+		<div class="text-indigo-100 text-4xl font-bold my-auto">
+			<div class="loader mx-auto" />
+			<div>{$loadingStateStore.message}</div>
+		</div>
+	</div>
+{/if}
+
+<style>
+	.loader {
+		border: 0.45em solid #f3f3f3;
+		border-radius: 50%;
+		border-top: 0.45em solid #6365f1;
+		width: 3em;
+		height: 3em;
+		-webkit-animation: spin 2s linear infinite; /* Safari */
+		animation: spin 2s linear infinite;
+	}
+
+	/* Safari */
+	@-webkit-keyframes spin {
+		0% {
+			-webkit-transform: rotate(0deg);
+		}
+		100% {
+			-webkit-transform: rotate(360deg);
+		}
+	}
+
+	@keyframes spin {
+		0% {
+			transform: rotate(0deg);
+		}
+		100% {
+			transform: rotate(360deg);
+		}
+	}
+</style>