refactor: migrate app to Alpine.js

app.js

@@ -1,113 +1,12 @@
+import Alpine from './vendor/alpine.js';
 import {render, styles, resolveFont} from './renderer.js';
 import {translations} from './translations.js';
 import {setupPWA} from './pwa.js';
 
-const text = document.getElementById('text');
+function savePreference(key, value) {
-const style = document.getElementById('style');
-const output = document.getElementById('output');
-const status = document.getElementById('status');
-const language = document.getElementById('language');
-const theme = document.getElementById('theme');
-let lang = document.documentElement.lang;
-let statusKey = '';
-const t = key => translations[lang][key];
-const showStatus = key => {
-    statusKey = key;
-    status.textContent = key ? t(key) : '';
-};
-const savePreference = (key, value) => {
     try { localStorage.setItem(`ascii-pwa-${key}`, value); } catch { /* Storage may be disabled. */ }
-};
-function translate() {
-    document.documentElement.lang = lang;
-    language.value = lang;
-    document.querySelectorAll('[data-i18n]').forEach(element => {
-        element.textContent = t(element.dataset.i18n);
-    });
-    output.setAttribute('aria-label', t('outputLabel'));
-    document.querySelector('.logo').setAttribute('aria-label', t('homeLabel'));
-    updateFontNavigation();
-    showStatus(statusKey);
-}
-let drawVersion = 0;
-let drawTimer;
-function updateFontNavigation() {
-    const next = styles[(styles.indexOf(style.value) + 1) % styles.length];
-    document.getElementById('next-font').textContent = t('nextFont').replace('{name}', next);
-}
-async function draw() {
-    const version = ++drawVersion;
-    const copy = document.getElementById('copy');
-    const download = document.getElementById('download');
-    copy.disabled = true;
-    download.disabled = true;
-    try {
-        const result = await render(text.value, style.value);
-        if (version !== drawVersion) return;
-        output.textContent = result;
-        showStatus('');
-    } catch {
-        if (version !== drawVersion) return;
-        output.textContent = '';
-        showStatus('renderFailed');
-    }
-    document.getElementById('copy').disabled = !output.textContent.trim();
-    document.getElementById('download').disabled = !output.textContent.trim();
 }
 
-// Explicit shared URLs take precedence; a normal visit always opens the homepage.
-const params = new URL(window.location.href).searchParams;
-style.replaceChildren(...styles.map(font => {
-    const option = document.createElement('option');
-    option.value = font;
-    option.textContent = font;
-    return option;
-}));
-style.value = 'Standard';
-try {
-    const savedFont = localStorage.getItem('ascii-pwa-font');
-    if (savedFont) style.value = resolveFont(savedFont);
-} catch { /* Use the default when saved preferences are unavailable. */ }
-if (params.has('text')) text.value = params.get('text').slice(0, 500);
-if (params.has('font')) style.value = resolveFont(params.get('font'));
-savePreference('font', style.value);
-theme.value = document.documentElement.dataset.theme;
-translate();
-draw();
-
-document.getElementById('render-form').addEventListener('submit', event => {
-    event.preventDefault();
-    draw();
-});
-style.addEventListener('change', () => {
-    clearTimeout(drawTimer);
-    savePreference('font', style.value);
-    updateFontNavigation();
-    draw();
-});
-text.addEventListener('input', () => {
-    clearTimeout(drawTimer);
-    ++drawVersion;
-    document.getElementById('copy').disabled = true;
-    document.getElementById('download').disabled = true;
-    drawTimer = setTimeout(draw, 150);
-});
-for (const [id, direction] of [['prev-font', -1], ['next-font', 1]]) {
-    document.getElementById(id).addEventListener('click', () => {
-        const index = (styles.indexOf(style.value) + direction + styles.length) % styles.length;
-        style.value = styles[index];
-        style.dispatchEvent(new Event('change'));
-    });
-}
-language.addEventListener('change', () => {
-    lang = language.value;
-    savePreference('language', lang);
-    translate();
-});
-theme.addEventListener('change', () => {
-    document.documentElement.dataset.theme = theme.value;
-    savePreference('theme', theme.value);
-});
 function copyText(value) {
     const field = document.createElement('textarea');
     const focused = document.activeElement;
@@ -126,20 +25,109 @@ function copyText(value) {
     }
 }
 
-document.getElementById('copy').addEventListener('click', () => {
+Alpine.data('asciiApp', () => {
+    let drawVersion = 0;
+    let drawTimer;
+    let pwa;
+
+    return {
+        styles,
+        text: 'hello world',
+        font: 'Standard',
+        ascii: '',
+        busy: true,
+        statusKey: '',
+        language: document.documentElement.lang,
+        theme: document.documentElement.dataset.theme,
+        installAvailable: false,
+        updateAvailable: false,
+        installed: false,
+
+        get nextFont() {
+            return styles[(styles.indexOf(this.font) + 1) % styles.length];
+        },
+        get canCopy() {
+            return !this.busy && !!this.ascii.trim();
+        },
+        t(key) {
+            return translations[this.language][key];
+        },
+        init() {
             try {
-        copyText(output.textContent);
+                const saved = localStorage.getItem('ascii-pwa-font');
-        showStatus('copied');
+                if (saved) this.font = resolveFont(saved);
+            } catch { /* Use the default when saved preferences are unavailable. */ }
+            const params = new URL(window.location.href).searchParams;
+            if (params.has('text')) this.text = params.get('text').slice(0, 500);
+            if (params.has('font')) this.font = resolveFont(params.get('font'));
+            savePreference('font', this.font);
+
+            this.$watch('text', () => this.scheduleDraw());
+            this.$watch('font', () => {
+                savePreference('font', this.font);
+                this.draw();
+            });
+            this.$watch('language', () => {
+                document.documentElement.lang = this.language;
+                savePreference('language', this.language);
+            });
+            this.$watch('theme', () => {
+                document.documentElement.dataset.theme = this.theme;
+                savePreference('theme', this.theme);
+            });
+            pwa = setupPWA({
+                installAvailable: value => { this.installAvailable = value; },
+                updateAvailable: value => { this.updateAvailable = value; },
+                installed: value => { this.installed = value; },
+                failed: () => { this.statusKey = 'offlineFailed'; },
+            });
+            this.draw();
+        },
+        destroy() {
+            clearTimeout(drawTimer);
+            ++drawVersion;
+            pwa?.destroy();
+        },
+        scheduleDraw() {
+            clearTimeout(drawTimer);
+            ++drawVersion;
+            this.busy = true;
+            drawTimer = setTimeout(() => this.draw(), 150);
+        },
+        async draw() {
+            clearTimeout(drawTimer);
+            const version = ++drawVersion;
+            this.busy = true;
+            try {
+                const result = await render(this.text, this.font);
+                if (version !== drawVersion) return;
+                this.ascii = result;
+                this.statusKey = '';
+            } catch {
+                if (version !== drawVersion) return;
+                this.ascii = '';
+                this.statusKey = 'renderFailed';
+            } finally {
+                if (version === drawVersion) this.busy = false;
+            }
+        },
+        cycleFont(direction) {
+            this.font = styles[(styles.indexOf(this.font) + direction + styles.length) % styles.length];
+        },
+        copy() {
+            try {
+                copyText(this.ascii);
+                this.statusKey = 'copied';
             } catch {
                 const range = document.createRange();
-        range.selectNodeContents(output);
+                range.selectNodeContents(this.$refs.output);
                 window.getSelection().removeAllRanges();
                 window.getSelection().addRange(range);
-        showStatus('copyFailed');
+                this.statusKey = 'copyFailed';
             }
-});
+        },
-document.getElementById('download').addEventListener('click', () => {
+        download() {
-    const url = URL.createObjectURL(new Blob([output.textContent + '\n'], {type: 'text/plain;charset=utf-8'}));
+            const url = URL.createObjectURL(new Blob([this.ascii + '\n'], {type: 'text/plain;charset=utf-8'}));
             const link = document.createElement('a');
             link.href = url;
             link.download = 'ascii-art.txt';
@@ -147,21 +135,23 @@ document.getElementById('download').addEventListener('click', () => {
             link.click();
             link.remove();
             setTimeout(() => URL.revokeObjectURL(url), 1000);
-    showStatus('downloaded');
+            this.statusKey = 'downloaded';
-});
+        },
-document.getElementById('share').addEventListener('click', () => {
+        share() {
             const url = new URL('./', window.location.href);
-    url.searchParams.set('text', text.value);
+            url.searchParams.set('text', this.text);
-    url.searchParams.set('font', style.value);
+            url.searchParams.set('font', this.font);
             try {
                 copyText(url.href);
-        showStatus('linkCopied');
+                this.statusKey = 'linkCopied';
             } catch {
                 window.history.replaceState(null, '', url);
-        showStatus('linkFailed');
+                this.statusKey = 'linkFailed';
             }
+        },
+        install() { return pwa.install(); },
+        update() { pwa.update(); },
+    };
 });
 
-setupPWA({
+Alpine.start();
-    failed() { showStatus('offlineFailed'); },
-});

index.html

@@ -14,58 +14,60 @@
     <script type="module" src="./app.js"></script>
 </head>
 <body>
-    <main>
+    <main x-data="asciiApp" x-cloak>
         <header>
-            <a class="logo" href="./" aria-label="ascii homepage">
+            <a class="logo" href="./" :aria-label="t('homeLabel')">
                 <img src="./icons/ascii.svg" width="64" height="64" alt="">
                 <h1>ascii!</h1>
             </a>
         </header>
-        <form id="render-form">
+        <form id="render-form" @submit.prevent="draw()">
-            <label for="text" data-i18n="textLabel">your text</label>
+            <label for="text" x-text="t('textLabel')">your text</label>
-            <textarea id="text" name="text" rows="2" maxlength="500" spellcheck="false">hello world</textarea>
+            <textarea id="text" name="text" rows="2" maxlength="500" spellcheck="false" x-model="text"></textarea>
             <div class="controls">
-                <label><span data-i18n="styleLabel">lettering</span>
+                <label><span x-text="t('styleLabel')">lettering</span>
-                    <select id="style" name="font">
+                    <select id="style" name="font" x-model="font">
-                        <option value="Standard">Standard</option>
+                        <template x-for="name in styles" :key="name">
+                            <option :value="name" :selected="name === font" x-text="name"></option>
+                        </template>
                     </select>
                 </label>
                 <div class="font-navigation">
-                    <button id="prev-font" type="button" data-i18n="prev">prev</button>
+                    <button id="prev-font" type="button" @click="cycleFont(-1)" x-text="t('prev')">prev</button>
-                    <button id="next-font" type="button">next font: 3-D</button>
+                    <button id="next-font" type="button" @click="cycleFont(1)" x-text="t('nextFont').replace('{name}', nextFont)"></button>
                 </div>
             </div>
         </form>
         <div class="output-heading">
-            <p data-i18n="preview">your ASCII art</p>
+            <p x-text="t('preview')">your ASCII art</p>
             <div class="actions">
-                <button id="copy" type="button" data-i18n="copy">copy</button>
+                <button id="copy" type="button" @click="copy()" :disabled="!canCopy" x-text="t('copy')">copy</button>
-                <button id="download" type="button" data-i18n="download">download .txt</button>
+                <button id="download" type="button" @click="download()" :disabled="!canCopy" x-text="t('download')">download .txt</button>
-                <button id="share" type="button" data-i18n="share">copy link</button>
+                <button id="share" type="button" @click="share()" x-text="t('share')">copy link</button>
             </div>
         </div>
-        <pre id="output" tabindex="0" aria-label="ASCII art"></pre>
+        <pre id="output" x-ref="output" tabindex="0" :aria-label="t('outputLabel')" :aria-busy="busy" x-text="ascii"></pre>
-        <p class="note" data-i18n="glyphNote">Character support varies by font.</p>
+        <p class="note" x-text="t('glyphNote')">Character support varies by font.</p>
-        <p id="status" role="status" aria-live="polite"></p>
+        <p id="status" role="status" aria-live="polite" x-text="statusKey ? t(statusKey) : ''"></p>
         <footer>
             <div class="preferences">
-                <label><span data-i18n="theme">appearance</span>
+                <label><span x-text="t('theme')">appearance</span>
-                    <select id="theme">
+                    <select id="theme" x-model="theme">
-                        <option value="system" data-i18n="system">system</option>
+                        <option value="system" x-text="t('system')">system</option>
-                        <option value="dark" data-i18n="dark">dark</option>
+                        <option value="dark" x-text="t('dark')">dark</option>
-                        <option value="light" data-i18n="light">light</option>
+                        <option value="light" x-text="t('light')">light</option>
                     </select>
                 </label>
-                <label><span data-i18n="language">language</span>
+                <label><span x-text="t('language')">language</span>
-                    <select id="language"><option value="en">English</option><option value="tr">Türkçe</option></select>
+                    <select id="language" x-model="language"><option value="en">English</option><option value="tr">Türkçe</option></select>
                 </label>
             </div>
             <div class="install-controls">
-                <button id="install" type="button" hidden data-i18n="install">install app</button>
+                <button id="install" type="button" x-show="installAvailable" @click="install()" x-text="t('install')">install app</button>
-                <button id="update" type="button" hidden data-i18n="update">update app</button>
+                <button id="update" type="button" x-show="updateAvailable" @click="update()" x-text="t('update')">update app</button>
-                <details id="install-guide">
+                <details id="install-guide" x-show="!installed && !installAvailable">
-                    <summary data-i18n="install">install app</summary>
+                    <summary x-text="t('install')">install app</summary>
-                    <p data-i18n="installGuide">Use your browser’s install option. In Safari on iPhone or iPad, choose Share → Add to Home Screen.</p>
+                    <p x-text="t('installGuide')">Use your browser’s install option. In Safari on iPhone or iPad, choose Share → Add to Home Screen.</p>
                 </details>
             </div>
         </footer>

pwa.js

@@ -1,51 +1,60 @@
-export function setupPWA({failed}) {
+// Browser prompt and worker objects stay outside Alpine's reactive state.
-    const install = document.getElementById('install');
+export function setupPWA({installAvailable, updateAvailable, installed, failed}) {
-    const guide = document.getElementById('install-guide');
-    const update = document.getElementById('update');
-    const standalone = () => window.matchMedia('(display-mode: standalone)').matches || navigator.standalone;
     let prompt;
-    guide.hidden = !!standalone();
+    let registration;
-    window.addEventListener('beforeinstallprompt', event => {
+    const cleanup = [];
+    const listen = (target, name, handler) => {
+        target.addEventListener(name, handler);
+        cleanup.push(() => target.removeEventListener(name, handler));
+    };
+    const standalone = () => window.matchMedia('(display-mode: standalone)').matches || !!navigator.standalone;
+    installed(standalone());
+    listen(window, 'beforeinstallprompt', event => {
         event.preventDefault();
         prompt = event;
-        install.hidden = false;
+        installAvailable(true);
-        guide.hidden = true;
     });
-    install.addEventListener('click', async () => {
+    listen(window, 'appinstalled', () => {
-        if (!prompt) return;
-        const pending = prompt;
         prompt = undefined;
-        install.hidden = true;
+        installAvailable(false);
-        try {
+        installed(true);
-            await pending.prompt();
-            await pending.userChoice;
-        } catch {
-            // Keep manual installation guidance available if the prompt fails.
-        } finally {
-            guide.hidden = !!standalone();
-        }
     });
-    window.addEventListener('appinstalled', () => {
+
-        prompt = undefined;
+    let destroyed = false;
-        install.hidden = true;
+    if ('serviceWorker' in navigator) {
-        guide.hidden = true;
-    });
-    if (!('serviceWorker' in navigator)) return;
         let controlled = !!navigator.serviceWorker.controller;
-    navigator.serviceWorker.addEventListener('controllerchange', () => {
+        listen(navigator.serviceWorker, 'controllerchange', () => {
             if (controlled) window.location.reload();
             controlled = true;
         });
         navigator.serviceWorker.register('./sw.js', {scope: './', type: 'module', updateViaCache: 'none'})
-        .then(registration => {
+            .then(value => {
-            const showUpdate = () => { update.hidden = !registration.waiting; };
+                if (destroyed) return;
+                registration = value;
+                const showUpdate = () => updateAvailable(!!registration.waiting);
                 showUpdate();
-            registration.addEventListener('updatefound', () => {
+                listen(registration, 'updatefound', () => {
-                const worker = registration.installing;
+                    if (registration.installing) listen(registration.installing, 'statechange', showUpdate);
-                if (worker) worker.addEventListener('statechange', showUpdate);
                 });
-            update.addEventListener('click', () => {
+            }).catch(() => { if (!destroyed) failed(); });
-                if (registration.waiting) registration.waiting.postMessage('ACTIVATE_UPDATE');
+    }
-            });
+    return {
-        }).catch(failed);
+        async install() {
+            if (!prompt) return;
+            const pending = prompt;
+            prompt = undefined;
+            installAvailable(false);
+            try {
+                await pending.prompt();
+                await pending.userChoice;
+            } catch { /* Manual installation guidance remains available. */ }
+        },
+        update() {
+            registration?.waiting?.postMessage('ACTIVATE_UPDATE');
+        },
+        destroy() {
+            destroyed = true;
+            cleanup.forEach(remove => remove());
+        },
+    };
 }

style.css

@@ -34,7 +34,7 @@
     }
 }
 * { box-sizing: border-box; }
-[hidden] { display: none !important; }
+[hidden], [x-cloak] { display: none !important; }
 body { margin: 0; padding: clamp(1rem, 4vw, 3rem); background: var(--background); color: var(--foreground); font-family: plexmono, Consolas, monospace; line-height: 1.6; }
 main { max-width: 1120px; margin: auto; min-width: 0; }
 header { margin-bottom: 2rem; }

sw.js

@@ -1,11 +1,11 @@
 // Bump VERSION whenever a shell file changes. New versions wait for approval.
-const VERSION = 'v7';
+const VERSION = 'v8';
 const BASE = self.registration.scope;
 const PREFIX = `ascii-pwa-${encodeURIComponent(BASE)}-`;
 const CACHE = `${PREFIX}${VERSION}`;
 const SHELL = [
     './', './index.html', './style.css', './appearance.js', './app.js',
-    './renderer.js', './font-catalog.js', './vendor/figlet.js',
+    './renderer.js', './font-catalog.js', './vendor/figlet.js', './vendor/alpine.js',
     './translations.js', './pwa.js', './manifest.webmanifest',
     './fonts/IBMPlexMono-Regular.subset.woff2',
     './fonts/IBMPlexMono-Bold.subset.woff2',

vendor/README.md

@@ -8,3 +8,8 @@ retain their embedded authorship and license notices unchanged.
 
 No CDN or npm installation is needed at runtime. Font data is loaded locally
 when selected and saved in a separate browser cache for later offline use.
+
+`alpine.js` is the unmodified ES module build of
+[`Alpine.js 3.14.9`](https://github.com/alpinejs/alpine/tree/v3.14.9).
+Its MIT license is retained as `alpine.LICENSE`. The bundled Vue reactivity
+code's MIT license is retained as `vue.LICENSE`.

vendor/alpine.LICENSE

@@ -0,0 +1,21 @@
+# MIT License
+
+Copyright © 2019-2021 Caleb Porzio and contributors
+
+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.

vendor/alpine.js

@@ -0,0 +1,5 @@
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vendor/vue.LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2018-present, Yuxi (Evan) You
+
+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.