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2479 lines (2305 loc) · 81.3 KB
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Sprout — Blueprint Overview v0.5.0</title>
<style>
*,
*::before,
*::after {
box-sizing: border-box;
margin: 0;
padding: 0;
}
:root {
--navy: #0a1628;
--surface: #0f1e35;
--silver: #e8eaed;
--blue: #2b7de9;
--orange: #e07018;
--muted: #8a9bb5;
--border: #1e3050;
--sidebar-w: 240px;
--font-body:
system-ui, "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont,
sans-serif;
--font-mono:
"IBM Plex Mono", "Cascadia Code", "Fira Code", "Courier New",
monospace;
}
html {
scroll-behavior: smooth;
font-size: 15px;
}
body {
background: var(--navy);
color: var(--silver);
font-family: var(--font-body);
line-height: 1.65;
min-height: 100vh;
}
/* ── Sidebar ── */
#sidebar {
position: fixed;
top: 0;
left: 0;
width: var(--sidebar-w);
height: 100vh;
background: #080f1e;
border-right: 1px solid var(--border);
overflow-y: auto;
padding: 0 0 2rem;
z-index: 100;
}
#sidebar .sidebar-brand {
padding: 1.25rem 1rem 1rem;
border-bottom: 1px solid var(--border);
margin-bottom: 0.5rem;
}
#sidebar .sidebar-brand h2 {
font-size: 1.05rem;
font-weight: 700;
letter-spacing: 0.04em;
background: linear-gradient(90deg, var(--blue), var(--orange));
-webkit-background-clip: text;
-webkit-text-fill-color: transparent;
background-clip: text;
}
#sidebar .sidebar-brand span {
font-size: 0.72rem;
color: var(--muted);
letter-spacing: 0.06em;
}
#sidebar nav ul {
list-style: none;
}
#sidebar nav ul li a {
display: flex;
align-items: center;
justify-content: space-between;
padding: 0.45rem 1rem;
color: var(--muted);
text-decoration: none;
font-size: 0.82rem;
transition:
color 0.15s,
background 0.15s;
border-left: 3px solid transparent;
}
#sidebar nav ul li a:hover,
#sidebar nav ul li a.active {
color: var(--silver);
background: rgba(43, 125, 233, 0.08);
border-left-color: var(--blue);
}
.gap-badge {
font-size: 0.65rem;
background: var(--orange);
color: #fff;
padding: 1px 5px;
border-radius: 3px;
font-weight: 600;
letter-spacing: 0.03em;
flex-shrink: 0;
}
.nav-section-label {
padding: 1rem 1rem 0.3rem;
font-size: 0.68rem;
color: var(--muted);
text-transform: uppercase;
letter-spacing: 0.1em;
font-weight: 600;
}
/* ── Main content ── */
#main {
margin-left: var(--sidebar-w);
padding: 0 2.5rem 4rem;
max-width: 1000px;
}
/* ── Header ── */
#site-header {
padding: 3rem 0 2rem;
border-bottom: 1px solid var(--border);
margin-bottom: 2.5rem;
}
#site-header .header-eyebrow {
font-size: 0.75rem;
letter-spacing: 0.12em;
text-transform: uppercase;
color: var(--orange);
font-weight: 600;
margin-bottom: 0.5rem;
}
#site-header h1 {
font-size: 2.4rem;
font-weight: 800;
letter-spacing: -0.02em;
line-height: 1.15;
}
#site-header h1 span {
color: var(--blue);
}
#site-header .tagline {
margin-top: 0.6rem;
font-size: 1.05rem;
color: var(--muted);
max-width: 560px;
}
.header-meta {
margin-top: 1.2rem;
display: flex;
gap: 1rem;
flex-wrap: wrap;
align-items: center;
}
.badge {
display: inline-block;
padding: 3px 10px;
border-radius: 4px;
font-size: 0.78rem;
font-weight: 600;
font-family: var(--font-mono);
}
.badge-blue {
background: rgba(43, 125, 233, 0.15);
color: var(--blue);
border: 1px solid rgba(43, 125, 233, 0.3);
}
.badge-orange {
background: rgba(224, 112, 24, 0.15);
color: var(--orange);
border: 1px solid rgba(224, 112, 24, 0.3);
}
.badge-green {
background: rgba(34, 197, 94, 0.12);
color: #4ade80;
border: 1px solid rgba(34, 197, 94, 0.25);
}
.header-link {
color: var(--blue);
text-decoration: none;
font-size: 0.85rem;
font-weight: 500;
}
.header-link:hover {
text-decoration: underline;
}
/* ── Section ── */
section {
margin-bottom: 3.5rem;
scroll-margin-top: 1.5rem;
}
section h2 {
font-size: 1.45rem;
font-weight: 700;
margin-bottom: 1rem;
padding-bottom: 0.5rem;
border-bottom: 1px solid var(--border);
display: flex;
align-items: center;
gap: 0.6rem;
}
section h2 .section-num {
font-size: 0.75rem;
color: var(--orange);
font-family: var(--font-mono);
font-weight: 700;
padding: 2px 6px;
border: 1px solid var(--orange);
border-radius: 3px;
flex-shrink: 0;
}
section h3 {
font-size: 1.05rem;
font-weight: 600;
margin: 1.5rem 0 0.6rem;
color: var(--silver);
}
section h4 {
font-size: 0.9rem;
font-weight: 600;
color: var(--muted);
margin: 1rem 0 0.4rem;
text-transform: uppercase;
letter-spacing: 0.06em;
}
p {
margin-bottom: 0.9rem;
}
/* ── Card ── */
.card {
background: var(--surface);
border: 1px solid var(--border);
border-radius: 6px;
padding: 1.25rem 1.5rem;
margin-bottom: 1.25rem;
border-top: 3px solid;
border-image: linear-gradient(90deg, var(--blue), var(--orange)) 1;
}
.card-grid {
display: grid;
grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
gap: 1rem;
margin-bottom: 1.25rem;
}
.stat-card {
background: var(--surface);
border: 1px solid var(--border);
border-top: 3px solid;
border-image: linear-gradient(90deg, var(--blue), var(--orange)) 1;
border-radius: 6px;
padding: 1rem 1.25rem;
text-align: center;
}
.stat-card .stat-num {
font-size: 1.6rem;
font-weight: 800;
color: var(--blue);
font-family: var(--font-mono);
}
.stat-card .stat-label {
font-size: 0.75rem;
color: var(--muted);
text-transform: uppercase;
letter-spacing: 0.07em;
margin-top: 0.2rem;
}
/* ── Code blocks ── */
pre {
background: var(--navy);
border: 1px solid var(--border);
border-radius: 5px;
padding: 1rem 1.25rem;
overflow-x: auto;
font-family: var(--font-mono);
font-size: 0.82rem;
line-height: 1.6;
margin: 0.75rem 0 1rem;
color: #b8cce8;
}
pre .kw {
color: var(--blue);
}
pre .str {
color: var(--orange);
}
pre .cm {
color: var(--muted);
font-style: italic;
}
pre .hl {
color: #4ade80;
}
pre .url {
color: #a78bfa;
}
pre .num {
color: #f9a8d4;
}
code {
font-family: var(--font-mono);
font-size: 0.84em;
background: rgba(43, 125, 233, 0.1);
color: #93c5fd;
padding: 1px 5px;
border-radius: 3px;
border: 1px solid rgba(43, 125, 233, 0.2);
}
pre code {
background: none;
border: none;
padding: 0;
color: inherit;
font-size: 1em;
}
/* ── Tables ── */
table {
width: 100%;
border-collapse: collapse;
font-size: 0.86rem;
margin: 0.75rem 0 1rem;
}
th {
background: rgba(43, 125, 233, 0.1);
color: var(--blue);
font-weight: 600;
text-align: left;
padding: 0.5rem 0.75rem;
border-bottom: 1px solid var(--border);
font-size: 0.78rem;
text-transform: uppercase;
letter-spacing: 0.06em;
}
td {
padding: 0.5rem 0.75rem;
border-bottom: 1px solid rgba(30, 48, 80, 0.6);
color: var(--silver);
vertical-align: top;
}
tr:last-child td {
border-bottom: none;
}
tr:hover td {
background: rgba(43, 125, 233, 0.04);
}
/* ── Lists ── */
ul,
ol {
padding-left: 1.5rem;
margin-bottom: 0.9rem;
}
li {
margin-bottom: 0.3rem;
}
/* ── Step list ── */
.steps {
list-style: none;
padding: 0;
counter-reset: step;
}
.steps li {
counter-increment: step;
display: flex;
gap: 1rem;
margin-bottom: 1rem;
align-items: flex-start;
}
.steps li::before {
content: counter(step);
background: linear-gradient(135deg, var(--blue), var(--orange));
color: #fff;
font-size: 0.78rem;
font-weight: 800;
min-width: 26px;
height: 26px;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
flex-shrink: 0;
margin-top: 0.1rem;
font-family: var(--font-mono);
}
/* ── Gap analysis ── */
.gap-box {
background: rgba(224, 112, 24, 0.07);
border: 1px solid rgba(224, 112, 24, 0.3);
border-left: 3px solid var(--orange);
border-radius: 5px;
padding: 0.85rem 1rem;
margin: 0.75rem 0;
font-size: 0.88rem;
}
.gap-box .gap-title {
font-weight: 700;
color: var(--orange);
margin-bottom: 0.3rem;
font-size: 0.9rem;
}
.gap-box .gap-status {
font-size: 0.75rem;
color: var(--muted);
font-family: var(--font-mono);
margin-bottom: 0.4rem;
}
/* ── Callout ── */
.callout {
display: flex;
gap: 0.75rem;
padding: 0.85rem 1rem;
border-radius: 5px;
margin: 0.75rem 0;
font-size: 0.88rem;
border: 1px solid;
align-items: flex-start;
}
.callout-info {
background: rgba(43, 125, 233, 0.08);
border-color: rgba(43, 125, 233, 0.25);
}
.callout-warn {
background: rgba(224, 112, 24, 0.08);
border-color: rgba(224, 112, 24, 0.25);
}
.callout-ok {
background: rgba(34, 197, 94, 0.07);
border-color: rgba(34, 197, 94, 0.2);
}
.callout-icon {
font-size: 1rem;
flex-shrink: 0;
margin-top: 1px;
}
/* ── Endpoint entry ── */
.endpoint {
display: flex;
gap: 0.6rem;
align-items: baseline;
margin-bottom: 0.25rem;
flex-wrap: wrap;
}
.method {
font-family: var(--font-mono);
font-size: 0.72rem;
font-weight: 700;
padding: 2px 7px;
border-radius: 3px;
flex-shrink: 0;
}
.method-get {
background: rgba(34, 197, 94, 0.15);
color: #4ade80;
border: 1px solid rgba(34, 197, 94, 0.3);
}
.method-post {
background: rgba(43, 125, 233, 0.15);
color: #60a5fa;
border: 1px solid rgba(43, 125, 233, 0.3);
}
.method-del {
background: rgba(239, 68, 68, 0.15);
color: #f87171;
border: 1px solid rgba(239, 68, 68, 0.3);
}
.endpoint-path {
font-family: var(--font-mono);
font-size: 0.86rem;
color: var(--silver);
}
.endpoint-desc {
font-size: 0.82rem;
color: var(--muted);
margin-left: auto;
}
.endpoint-group {
background: var(--surface);
border: 1px solid var(--border);
border-radius: 6px;
padding: 1rem 1.25rem;
margin-bottom: 1rem;
border-top: 3px solid;
border-image: linear-gradient(90deg, var(--blue), var(--orange)) 1;
}
.endpoint-group h4 {
margin-top: 0;
color: var(--blue);
font-size: 0.8rem;
text-transform: uppercase;
letter-spacing: 0.1em;
margin-bottom: 0.75rem;
font-weight: 700;
border-bottom: 1px solid var(--border);
padding-bottom: 0.4rem;
}
/* ── Component tree ── */
.component-tree {
font-family: var(--font-mono);
font-size: 0.82rem;
line-height: 1.7;
color: #b8cce8;
}
.component-tree .comp-name {
color: var(--blue);
}
.component-tree .file-ref {
color: var(--muted);
font-size: 0.75rem;
}
/* ── HR ── */
hr {
border: none;
border-top: 1px solid var(--border);
margin: 2rem 0;
}
/* ── Scroll indicator (top bar) ── */
#scroll-bar {
position: fixed;
top: 0;
left: 0;
right: 0;
height: 3px;
background: linear-gradient(90deg, var(--blue), var(--orange));
transform-origin: left;
transform: scaleX(0);
z-index: 200;
transition: transform 0.1s;
}
/* ── Responsive ── */
@media (max-width: 768px) {
:root {
--sidebar-w: 0px;
}
#sidebar {
width: 100%;
height: auto;
position: sticky;
top: 0;
overflow-x: auto;
overflow-y: hidden;
white-space: nowrap;
border-right: none;
border-bottom: 1px solid var(--border);
padding: 0;
}
#sidebar .sidebar-brand {
display: none;
}
#sidebar .nav-section-label {
display: none;
}
#sidebar nav ul {
display: flex;
flex-direction: row;
}
#sidebar nav ul li a {
border-left: none;
border-bottom: 3px solid transparent;
padding: 0.65rem 0.85rem;
white-space: nowrap;
}
#sidebar nav ul li a.active,
#sidebar nav ul li a:hover {
border-bottom-color: var(--blue);
border-left-color: transparent;
}
#main {
margin-left: 0;
padding: 0 1rem 4rem;
}
.gap-badge {
display: none;
}
}
</style>
</head>
<body>
<div id="scroll-bar"></div>
<!-- ── Sidebar ── -->
<aside id="sidebar">
<div class="sidebar-brand">
<h2>Sprout</h2>
<span>Blueprint v0.5.0</span>
</div>
<nav>
<div class="nav-section-label">Getting Started</div>
<ul>
<li><a href="#quick-start">Quick Start</a></li>
<li><a href="#overview">Project Overview</a></li>
</ul>
<div class="nav-section-label">Technical</div>
<ul>
<li><a href="#architecture">Architecture</a></li>
<li><a href="#installation">Installation</a></li>
<li><a href="#api">API Reference</a></li>
<li><a href="#frontend">Frontend Components</a></li>
<li><a href="#voice">Voice Features</a></li>
<li><a href="#tech-stack">Tech Stack</a></li>
</ul>
<div class="nav-section-label">Development</div>
<ul>
<li><a href="#development">Development</a></li>
<li>
<a href="#gap-analysis"
>Gap Analysis <span class="gap-badge">4</span></a
>
</li>
</ul>
</nav>
</aside>
<!-- ── Main ── -->
<main id="main">
<!-- ── Header ── -->
<div id="site-header">
<div class="header-eyebrow">CoreConduit / rpi-sprout</div>
<h1><span>Sprout</span> — Blueprint Overview</h1>
<p class="tagline">
A revival of Microsoft Office 97's animated assistant as a local LLM
chat interface, running headless on Raspberry Pi 5. No cloud. No
Electron. No display server required.
</p>
<div class="header-meta">
<span class="badge badge-blue">v0.5.0</span>
<span class="badge badge-orange">Flask + React SPA</span>
<span class="badge badge-green">Pi 5 Ready</span>
<a
class="header-link"
href="https://github.com/bitsandbots/rpi-sprout"
>github.com/bitsandbots/rpi-sprout</a
>
</div>
</div>
<!-- ══════════════════════════════════════════
1. QUICK START
══════════════════════════════════════════ -->
<section id="quick-start">
<h2><span class="section-num">01</span> Quick Start</h2>
<ol class="steps">
<li>
<div>
<strong>Install Ollama</strong>
<pre><code><span class="hl">curl</span> -fsSL https://ollama.com/install.sh | sh
sudo systemctl status ollama</code></pre>
</div>
</li>
<li>
<div>
<strong>Pull a model</strong> (choose based on available RAM — see
<a href="#tech-stack" style="color: var(--blue)">Tech Stack</a>
for recommendations)
<pre><code><span class="cm"># 4 GB Pi — either of these</span>
ollama pull llama3.2:1b
ollama pull gemma3:1b
<span class="cm"># 8 GB Pi</span>
ollama pull qwen3:4b</code></pre>
</div>
</li>
<li>
<div>
<strong>Clone the repository</strong>
<pre><code>git clone https://github.com/bitsandbots/rpi-sprout
cd rpi-sprout</code></pre>
</div>
</li>
<li>
<div>
<strong>Run the installer</strong> — installs dependencies, builds
the frontend, registers and starts the systemd service
<pre><code>bash install.sh</code></pre>
Then open <code>http://<pi-ip>:5080</code> from any device
on the LAN. Voice features need Piper voices (optional,
post-install):
<pre><code>bash scripts/setup_voices.sh <span class="cm"># default voices</span>
bash scripts/setup_voices.sh all <span class="cm"># all available</span></code></pre>
</div>
</li>
</ol>
</section>
<!-- ══════════════════════════════════════════
2. OVERVIEW
══════════════════════════════════════════ -->
<section id="overview">
<h2><span class="section-num">02</span> Project Overview</h2>
<p>
Sprout replaces the original Electron-based Clippy revival with a
Flask + React SPA that runs headless on a Raspberry Pi 5, accessible
from any browser on the local network. Removing Electron saved ~100 MB
of dependencies and eliminated the requirement for a display server.
</p>
<div class="card-grid">
<div class="stat-card">
<div class="stat-num">5080</div>
<div class="stat-label">Default port</div>
</div>
<div class="stat-card">
<div class="stat-num">0 ☁</div>
<div class="stat-label">Cloud deps</div>
</div>
<div class="stat-card">
<div class="stat-num">169</div>
<div class="stat-label">Backend tests</div>
</div>
<div class="stat-card">
<div class="stat-num">77</div>
<div class="stat-label">Frontend tests</div>
</div>
</div>
<h3>Goals</h3>
<table>
<thead>
<tr>
<th>Goal</th>
<th>Status</th>
</tr>
</thead>
<tbody>
<tr>
<td>Local LLM inference via Ollama</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
<tr>
<td>Windows 98-style UI (98.css)</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
<tr>
<td>Text-to-Speech via Piper TTS</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
<tr>
<td>Speech-to-Text via Faster-Whisper</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
<tr>
<td>Persistent chat history (JSON files)</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
<tr>
<td>Systemd auto-start on boot</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
<tr>
<td>Hardened voice error handling</td>
<td><span class="badge badge-green">Complete</span></td>
</tr>
</tbody>
</table>
<h3>Data Flow</h3>
<pre><code>User (browser) → textarea → Send
│
▼
React (api.ts) → EventSource /api/llm/stream?uuid=&message=
│
▼
Flask (app.py) → OllamaService.prompt_streaming()
│
▼
Ollama (localhost:11434) → streaming JSON response
│
▼
SSE chunks → React → message display + optional TTS playback</code></pre>
<h3>Storage Layout</h3>
<pre><code>~/.config/Sprout/
├── settings.json <span class="cm"># font, model, selectedVoice, etc.</span>
├── debug.json <span class="cm"># debug flags (polled every 5 s)</span>
├── chats/
│ ├── chats.json <span class="cm"># index of all conversations</span>
│ └── <uuid>.json <span class="cm"># individual chat + messages</span>
└── voices/
├── <id>.onnx <span class="cm"># Piper voice model</span>
├── <id>.onnx.json <span class="cm"># Piper voice config</span>
└── <id>.meta.json <span class="cm"># display metadata</span>
~/.ollama/models/ <span class="cm"># LLM weights (managed by Ollama)</span></code></pre>
<h3>Non-Goals</h3>
<ul>
<li>Cloud LLM integration (OpenAI, Anthropic, etc.)</li>
<li>Authentication / authorization</li>
<li>Cross-device sync</li>
<li>Wake-word voice assistant</li>
<li>Native mobile app</li>
</ul>
</section>
<!-- ══════════════════════════════════════════
3. ARCHITECTURE
══════════════════════════════════════════ -->
<section id="architecture">
<h2><span class="section-num">03</span> Architecture</h2>
<h3>Three-Tier Diagram</h3>
<pre><code>┌─────────────────────────────────────────────────────────────────┐
│ Presentation Layer │
│ Browser → React SPA (98.css aesthetic) │
│ BubbleWindow.tsx · Sprout.tsx · Settings panels │
└───────────────────────────┬─────────────────────────────────────┘
│ HTTP + SSE (port 5080)
▼
┌─────────────────────────────────────────────────────────────────┐
│ Application Layer (Flask) │
│ app.py — REST routes, SSE endpoints, thread-safe singletons │
└───────────────────────────┬─────────────────────────────────────┘
│ Ollama HTTP · File I/O
▼
┌─────────────────────────────────────────────────────────────────┐
│ Data Layer (Python + FS) │
│ OllamaService ChatManager SettingsManager TTSManager STT │
└─────────────────────────────────────────────────────────────────┘</code></pre>
<h3>Core Python Modules</h3>
<table>
<thead>
<tr>
<th>Module</th>
<th>Path</th>
<th>Responsibility</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>OllamaService</code></td>
<td><code>src/python/ollama_service.py</code></td>
<td>
LLM inference, model pull fan-out, SSE queues, abort events
</td>
</tr>
<tr>
<td><code>ChatManager</code></td>
<td><code>src/python/chat_manager.py</code></td>
<td>
JSON-file CRUD for conversations under
<code>~/.config/Sprout/chats/</code>
</td>
</tr>
<tr>
<td><code>SettingsManager</code></td>
<td><code>src/python/settings_manager.py</code></td>
<td>
Dot-notation get/set against <code>settings.json</code>; also
hosts <code>DebugSettingsManager</code>
</td>
</tr>
<tr>
<td><code>TTSManager</code></td>
<td><code>src/python/tts_manager.py</code></td>
<td>
Piper <code>.onnx</code> voice loading, text → WAV synthesis,
voice registry
</td>
</tr>
<tr>
<td><code>STTManager</code></td>
<td><code>src/python/stt_manager.py</code></td>
<td>
Faster-Whisper model loading, audio → text (base64 or file)
</td>
</tr>
</tbody>
</table>
<h3>Thread Safety Pattern</h3>
<p>
All five managers are Flask-thread-safe singletons using
double-checked locking:
</p>
<pre><code><span class="kw">def</span> get_tts_manager() -> TTSManager:
<span class="kw">global</span> _tts
<span class="kw">if</span> _tts <span class="kw">is None</span>:
<span class="kw">with</span> _tts_lock:
<span class="kw">if</span> _tts <span class="kw">is None</span>:
_tts = TTSManager()
<span class="kw">return</span> _tts</code></pre>
<table>
<thead>
<tr>
<th>Resource</th>
<th>Lock</th>
<th>Protects</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>_history</code></td>
<td><code>_history_lock</code></td>
<td>Conversation history (race in streaming + writes)</td>
</tr>
<tr>
<td><code>_loaded_voice</code></td>
<td><code>_lock</code></td>
<td>Concurrent TTS synthesis</td>
</tr>
<tr>
<td><code>_pull_queues</code></td>
<td><code>_pull_lock</code></td>
<td>SSE fan-out subscriber list</td>
</tr>
</tbody>
</table>
<h3>SSE Streaming Patterns</h3>
<p>Two SSE mechanisms are used:</p>
<ul>
<li>
<strong>LLM inference</strong> — each client gets a direct
generator. Abort via <code>POST /api/llm/abort</code> sets a
<code>threading.Event</code> checked per chunk.
</li>
<li>
<strong>Model pull progress</strong> — fan-out via
<code>queue.Queue</code> per subscriber. Multiple browser tabs can
watch the same pull.
</li>
</ul>
<h3>Security Controls</h3>
<table>
<thead>
<tr>