Virtual apps: 2–3 stateful ticking apps for the demo #151

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Open
Virtual apps: 2–3 stateful ticking apps for the demo#151
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enhancementNew feature or request

Description

@jonocodes
jonocodes
opened on Aug 14, 2026

Virtual apps: 2–3 stateful ticking apps

The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.

Apps (start with these)

  1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
  2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
  3. One more (lighting or a timer) so switching between apps feels meaningful.

Interface

Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.

Two payoffs, not one

  • Drives the demo.
  • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.

Part of the mocked-demo epic. Depends on the MockDaemon foundation.

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      , 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
       blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

      Skip to content
      Virtual apps: 2–3 stateful ticking apps for the demo #151
      Open
      Open
      Virtual apps: 2–3 stateful ticking apps for the demo#151
      Labels
      enhancementNew feature or request
      Description
      @jonocodes
      jonocodes
      opened on Aug 14, 2026
      Virtual apps: 2–3 stateful ticking apps
      The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
      Apps (start with these)
      1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
      2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
      3. One more (lighting or a timer) so switching between apps feels meaningful.
      Interface
      Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
      Two payoffs, not one
      • Drives the demo.
      • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
      Part of the mocked-demo epic. Depends on the MockDaemon foundation.
      Metadata
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

          Skip to content
          Virtual apps: 2–3 stateful ticking apps for the demo #151
          Open
          Open
          Virtual apps: 2–3 stateful ticking apps for the demo#151
          Labels
          enhancementNew feature or request
          Description
          @jonocodes
          jonocodes
          opened on Aug 14, 2026
          Virtual apps: 2–3 stateful ticking apps
          The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
          Apps (start with these)
          1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
          2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
          3. One more (lighting or a timer) so switching between apps feels meaningful.
          Interface
          Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
          Two payoffs, not one
          • Drives the demo.
          • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
          Part of the mocked-demo epic. Depends on the MockDaemon foundation.
          Metadata
          Metadata
          Assignees
          No one assigned
            Labels
            enhancementNew feature or request
            Projects
            No projects
              Milestone
              No milestone
              Relationships
              None yet
              Development
              No branches or pull requests
              Issue actions
              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

              Skip to content
              Virtual apps: 2–3 stateful ticking apps for the demo #151
              Open
              Open
              Virtual apps: 2–3 stateful ticking apps for the demo#151
              Labels
              enhancementNew feature or request
              Description
              @jonocodes
              jonocodes
              opened on Aug 14, 2026
              Virtual apps: 2–3 stateful ticking apps
              The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
              Apps (start with these)
              1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
              2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
              3. One more (lighting or a timer) so switching between apps feels meaningful.
              Interface
              Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
              Two payoffs, not one
              • Drives the demo.
              • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
              Part of the mocked-demo epic. Depends on the MockDaemon foundation.
              Metadata
              Metadata
              Assignees
              No one assigned
                Labels
                enhancementNew feature or request
                Projects
                No projects
                  Milestone
                  No milestone
                  Relationships
                  None yet
                  Development
                  No branches or pull requests
                  Issue actions
                  
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

                  Skip to content
                  Virtual apps: 2–3 stateful ticking apps for the demo #151
                  Open
                  Open
                  Virtual apps: 2–3 stateful ticking apps for the demo#151
                  Labels
                  enhancementNew feature or request
                  Description
                  @jonocodes
                  jonocodes
                  opened on Aug 14, 2026
                  Virtual apps: 2–3 stateful ticking apps
                  The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
                  Apps (start with these)
                  1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
                  2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
                  3. One more (lighting or a timer) so switching between apps feels meaningful.
                  Interface
                  Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
                  Two payoffs, not one
                  • Drives the demo.
                  • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
                  Part of the mocked-demo epic. Depends on the MockDaemon foundation.
                  Metadata
                  Metadata
                  Assignees
                  No one assigned
                    Labels
                    enhancementNew feature or request
                    Projects
                    No projects
                      Milestone
                      No milestone
                      Relationships
                      None yet
                      Development
                      No branches or pull requests
                      Issue actions
                      
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                      Skip to content
                      Virtual apps: 2–3 stateful ticking apps for the demo #151
                      Open
                      Open
                      Virtual apps: 2–3 stateful ticking apps for the demo#151
                      Labels
                      enhancementNew feature or request
                      Description
                      @jonocodes
                      jonocodes
                      opened on Aug 14, 2026
                      Virtual apps: 2–3 stateful ticking apps
                      The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
                      Apps (start with these)
                      1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
                      2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
                      3. One more (lighting or a timer) so switching between apps feels meaningful.
                      Interface
                      Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
                      Two payoffs, not one
                      • Drives the demo.
                      • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
                      Part of the mocked-demo epic. Depends on the MockDaemon foundation.
                      Metadata
                      Metadata
                      Assignees
                      No one assigned
                        Labels
                        enhancementNew feature or request
                        Projects
                        No projects
                          Milestone
                          No milestone
                          Relationships
                          None yet
                          Development
                          No branches or pull requests
                          Issue actions
                          
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

                          Skip to content
                          Virtual apps: 2–3 stateful ticking apps for the demo #151
                          Open
                          Open
                          Virtual apps: 2–3 stateful ticking apps for the demo#151
                          Labels
                          enhancementNew feature or request
                          Description
                          @jonocodes
                          jonocodes
                          opened on Aug 14, 2026
                          Virtual apps: 2–3 stateful ticking apps
                          The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
                          Apps (start with these)
                          1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
                          2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
                          3. One more (lighting or a timer) so switching between apps feels meaningful.
                          Interface
                          Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
                          Two payoffs, not one
                          • Drives the demo.
                          • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
                          Part of the mocked-demo epic. Depends on the MockDaemon foundation.
                          Metadata
                          Metadata
                          Assignees
                          No one assigned
                            Labels
                            enhancementNew feature or request
                            Projects
                            No projects
                              Milestone
                              No milestone
                              Relationships
                              None yet
                              Development
                              No branches or pull requests
                              Issue actions
                              
, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

                              Skip to content
                              Virtual apps: 2–3 stateful ticking apps for the demo #151
                              Open
                              Open
                              Virtual apps: 2–3 stateful ticking apps for the demo#151
                              Labels
                              enhancementNew feature or request
                              Description
                              @jonocodes
                              jonocodes
                              opened on Aug 14, 2026
                              Virtual apps: 2–3 stateful ticking apps
                              The "background processes" that make the demo feel alive — each holds state, ticks on the shared clock, and responds to deck presses.
                              Apps (start with these)
                              1. Music player — position advances while playing; emits media_state + chrome_media; responds to media_command (play/pause/next/prev). The progress bar keeps moving while you're on another deck.
                              2. Sensor source — CPU/temp/etc. meters that wander deterministically; emits widget_update.
                              3. One more (lighting or a timer) so switching between apps feels meaningful.
                              Interface
                              Each app implements the virtual-app abstraction from the foundation issue: tick(dt) to advance state and handle(clientMessage) to react to presses/commands.
                              Two payoffs, not one
                              • Drives the demo.
                              • Doubles as deterministic test fixtures for the focus-driven app-switching logic, which is otherwise painful to test. Keep them deterministic to preserve this.
                              Part of the mocked-demo epic. Depends on the MockDaemon foundation.
                              Metadata
                              Metadata
                              Assignees
                              No one assigned
                                Labels
                                enhancementNew feature or request
                                Projects
                                No projects
                                  Milestone
                                  No milestone
                                  Relationships
                                  None yet
                                  Development
                                  No branches or pull requests
                                  Issue actions