feat: MVP webinterface

Server-rendered HTML via Jinja2 templates in FastAPI:
- Homepage: zoekbalk, statistieken, inhoudsopgave Grondwet
- /grondwet: volledige tekst als leesbare pagina
- /grondwet/samenvatting: AI-samenvatting (B1-niveau)
- /zoeken: keyword (Meilisearch) + semantisch (Qdrant)
- /historie: tijdlijn van versies
- /diff: visuele vergelijking tussen twee versies
- Sober, responsive CSS (overheidsstijl)
- Disclaimer op elke pagina

flake.nix: jinja2 + markdown packages toegevoegd

Sluit #39

flake.nix

@@ -32,6 +32,10 @@
           click
           rich              # Terminal formatting
 
+          # Webinterface
+          jinja2            # HTML templates
+          markdown          # Markdown → HTML rendering
+
           # Testing
           pytest
           pytest-cov

src/wetgit/api/app.py

@@ -47,6 +47,15 @@ app.add_middleware(
 
 store = RegelingStore(REPO_PATH)
 
+# --- Webinterface ---
+from pathlib import Path as _Path
+from fastapi.staticfiles import StaticFiles
+from wetgit.web.routes import router as web_router, init_routes
+
+app.mount("/static", StaticFiles(directory=str(_Path(__file__).parent.parent / "web" / "static")), name="static")
+init_routes(store)
+app.include_router(web_router)
+
 
 # --- Health ---
 

src/wetgit/web/__init__.py

@@ -0,0 +1 @@
+"""WetGit webinterface."""

src/wetgit/web/routes.py

@@ -0,0 +1,198 @@
+"""Web routes — server-rendered HTML pagina's."""
+
+from __future__ import annotations
+
+import re
+from pathlib import Path
+
+import markdown
+from fastapi import APIRouter, Query, Request
+from fastapi.responses import HTMLResponse
+from fastapi.templating import Jinja2Templates
+
+from wetgit.api.data import RegelingStore
+
+router = APIRouter()
+templates = Jinja2Templates(directory=str(Path(__file__).parent / "templates"))
+
+BWB_GRONDWET = "BWBR0001840"
+
+# Store wordt gezet vanuit app.py
+_store: RegelingStore | None = None
+
+
+def init_routes(store: RegelingStore) -> None:
+    """Initialiseer de routes met een RegelingStore."""
+    global _store
+    _store = store
+
+
+def _get_store() -> RegelingStore:
+    if _store is None:
+        raise RuntimeError("Store niet geinitialiseerd")
+    return _store
+
+
+@router.get("/", response_class=HTMLResponse)
+def homepage(request: Request) -> HTMLResponse:
+    """Homepage met zoekbalk en Grondwet overzicht."""
+    store = _get_store()
+    tekst = store.get_tekst(BWB_GRONDWET) or ""
+
+    # Tel artikelen en hoofdstukken
+    artikelen = len(re.findall(r"^### Artikel", tekst, re.MULTILINE))
+    versies = store.get_versies(BWB_GRONDWET)
+
+    # Extraheer hoofdstukken voor de inhoudsopgave
+    hoofdstukken = []
+    for match in re.finditer(r"^## (.+)$", tekst, re.MULTILINE):
+        titel = match.group(1).strip()
+        anchor = re.sub(r"[^\w\s-]", "", titel.lower()).replace(" ", "-")
+        hoofdstukken.append({"titel": titel, "anchor": anchor})
+
+    return templates.TemplateResponse("index.html", {
+        "request": request,
+        "stats": {
+            "artikelen": artikelen,
+            "versies": len(versies),
+            "regelingen": len(store.list_regelingen()),
+        },
+        "hoofdstukken": hoofdstukken,
+    })
+
+
+@router.get("/grondwet", response_class=HTMLResponse)
+def grondwet(request: Request) -> HTMLResponse:
+    """De Grondwet als leesbare pagina."""
+    store = _get_store()
+    tekst = store.get_tekst(BWB_GRONDWET)
+    if not tekst:
+        return HTMLResponse("<h1>Niet gevonden</h1>", status_code=404)
+
+    # Strip frontmatter
+    if tekst.startswith("---"):
+        _, _, tekst = tekst.split("---", 2)
+
+    # Markdown → HTML met anchor IDs op artikelen
+    content_html = markdown.markdown(tekst, extensions=["toc"])
+
+    # Voeg ID's toe aan artikelen
+    content_html = re.sub(
+        r"<h3>Artikel (\S+)",
+        r'<h3 id="artikel-\1">Artikel \1',
+        content_html,
+    )
+
+    regeling = store.get_regeling(BWB_GRONDWET) or {}
+    versies = store.get_versies(BWB_GRONDWET)
+    summary_path = Path(store.repo_path) / (regeling.get("pad", "") + "/summary.md") if regeling.get("pad") else None
+
+    return templates.TemplateResponse("regeling.html", {
+        "request": request,
+        "titel": regeling.get("titel", "Grondwet"),
+        "bwb_id": BWB_GRONDWET,
+        "type": regeling.get("type", "wet"),
+        "versies": len(versies),
+        "has_summary": summary_path and summary_path.exists() if summary_path else False,
+        "content_html": content_html,
+    })
+
+
+@router.get("/grondwet/samenvatting", response_class=HTMLResponse)
+def samenvatting(request: Request) -> HTMLResponse:
+    """AI-samenvatting van de Grondwet."""
+    store = _get_store()
+    regeling = store.get_regeling(BWB_GRONDWET) or {}
+    pad = regeling.get("pad", "")
+
+    summary_path = store.repo_path / pad / "summary.md"
+    if not summary_path.exists():
+        return HTMLResponse("<h1>Samenvatting niet beschikbaar</h1>", status_code=404)
+
+    tekst = summary_path.read_text(encoding="utf-8")
+    content_html = markdown.markdown(tekst)
+
+    return templates.TemplateResponse("samenvatting.html", {
+        "request": request,
+        "content_html": content_html,
+    })
+
+
+@router.get("/zoeken", response_class=HTMLResponse)
+def zoeken_page(
+    request: Request,
+    q: str = Query("", description="Zoekterm"),
+    mode: str = Query("keyword", description="Zoekmodus"),
+) -> HTMLResponse:
+    """Zoekpagina."""
+    results = []
+
+    if q and len(q) >= 2:
+        import os
+        from wetgit.api.search import MeiliSearch
+        from wetgit.ai.semantic import SemanticSearch
+
+        meili_url = os.environ.get("MEILI_URL", "http://127.0.0.1:7700")
+        qdrant_url = os.environ.get("QDRANT_URL", "http://127.0.0.1:6333")
+
+        if mode == "semantic":
+            sem = SemanticSearch(qdrant_url=qdrant_url)
+            if sem.health():
+                results = sem.search(q, limit=20)
+        else:
+            meili = MeiliSearch(url=meili_url)
+            if meili.health():
+                raw = meili.search(q, limit=20)
+                results = [
+                    {
+                        "bwb_id": h["bwb_id"],
+                        "titel": h.get("regeling_titel", ""),
+                        "artikel": f"Artikel {h.get('artikel_nummer', '?')}",
+                        "context": h.get("tekst", "")[:200],
+                    }
+                    for h in raw.get("hits", [])
+                ]
+
+    return templates.TemplateResponse("zoeken.html", {
+        "request": request,
+        "query": q,
+        "mode": mode,
+        "results": results,
+    })
+
+
+@router.get("/historie", response_class=HTMLResponse)
+def historie(request: Request) -> HTMLResponse:
+    """Tijdlijn van versies."""
+    store = _get_store()
+    versies = store.get_versies(BWB_GRONDWET)
+
+    return templates.TemplateResponse("historie.html", {
+        "request": request,
+        "versies": versies,
+    })
+
+
+@router.get("/diff", response_class=HTMLResponse)
+def diff_page(
+    request: Request,
+    van: str = Query(..., description="Van datum"),
+    tot: str = Query(..., description="Tot datum"),
+) -> HTMLResponse:
+    """Diff pagina."""
+    store = _get_store()
+    result = store.get_diff(BWB_GRONDWET, van, tot)
+
+    if not result:
+        return HTMLResponse("<h1>Geen diff beschikbaar</h1>", status_code=404)
+
+    diff_lines = result["diff"].split("\n")
+
+    return templates.TemplateResponse("diff.html", {
+        "request": request,
+        "van": van,
+        "tot": tot,
+        "added": result["regels_toegevoegd"],
+        "removed": result["regels_verwijderd"],
+        "diff_lines": diff_lines,
+    })

src/wetgit/web/static/style.css

@@ -0,0 +1,164 @@
+/* WetGit — sober, leesbaar, overheidsstijl */
+
+:root {
+    --color-bg: #ffffff;
+    --color-text: #1a1a2e;
+    --color-muted: #6b7280;
+    --color-border: #e5e7eb;
+    --color-accent: #1e40af;
+    --color-accent-light: #dbeafe;
+    --color-green: #166534;
+    --color-green-bg: #dcfce7;
+    --color-red: #991b1b;
+    --color-red-bg: #fee2e2;
+    --color-warn-bg: #fef3c7;
+    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+    --font-mono: "SF Mono", "Fira Code", monospace;
+    --max-width: 800px;
+}
+
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+body {
+    font-family: var(--font-body);
+    color: var(--color-text);
+    background: var(--color-bg);
+    line-height: 1.7;
+    font-size: 17px;
+}
+
+a { color: var(--color-accent); text-decoration: none; }
+a:hover { text-decoration: underline; }
+
+/* Layout */
+.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }
+
+header {
+    border-bottom: 1px solid var(--color-border);
+    padding: 1rem 0;
+    margin-bottom: 2rem;
+}
+header .container { display: flex; align-items: center; justify-content: space-between; }
+header h1 { font-size: 1.3rem; font-weight: 700; }
+header h1 a { color: var(--color-text); }
+header nav a { margin-left: 1.5rem; color: var(--color-muted); font-size: 0.9rem; }
+header nav a:hover { color: var(--color-text); }
+
+footer {
+    border-top: 1px solid var(--color-border);
+    padding: 2rem 0;
+    margin-top: 3rem;
+    color: var(--color-muted);
+    font-size: 0.85rem;
+}
+
+/* Search */
+.search-box {
+    display: flex;
+    gap: 0.5rem;
+    margin: 1.5rem 0;
+}
+.search-box input[type="text"] {
+    flex: 1;
+    padding: 0.7rem 1rem;
+    border: 2px solid var(--color-border);
+    border-radius: 6px;
+    font-size: 1rem;
+    font-family: var(--font-body);
+}
+.search-box input:focus { outline: none; border-color: var(--color-accent); }
+.search-box select {
+    padding: 0.7rem;
+    border: 2px solid var(--color-border);
+    border-radius: 6px;
+    font-size: 0.9rem;
+    background: white;
+}
+.search-box button {
+    padding: 0.7rem 1.5rem;
+    background: var(--color-accent);
+    color: white;
+    border: none;
+    border-radius: 6px;
+    font-size: 1rem;
+    cursor: pointer;
+}
+.search-box button:hover { background: #1e3a8a; }
+
+/* Content */
+h1 { font-size: 2rem; margin-bottom: 0.5rem; }
+h2 { font-size: 1.5rem; margin: 2rem 0 0.8rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.3rem; }
+h3 { font-size: 1.15rem; margin: 1.5rem 0 0.5rem; }
+
+.subtitle { color: var(--color-muted); margin-bottom: 2rem; }
+.tag {
+    display: inline-block;
+    background: var(--color-accent-light);
+    color: var(--color-accent);
+    padding: 0.15rem 0.6rem;
+    border-radius: 4px;
+    font-size: 0.8rem;
+    font-weight: 600;
+}
+
+/* Disclaimer */
+.disclaimer {
+    background: var(--color-warn-bg);
+    border-left: 4px solid #f59e0b;
+    padding: 0.8rem 1rem;
+    margin: 1.5rem 0;
+    font-size: 0.9rem;
+    border-radius: 0 4px 4px 0;
+}
+
+/* Artikelen */
+.artikel { margin: 1.5rem 0; }
+.artikel h3 a { color: var(--color-text); }
+.artikel-tekst { padding-left: 0; }
+
+/* Zoekresultaten */
+.result { border-bottom: 1px solid var(--color-border); padding: 1rem 0; }
+.result:last-child { border-bottom: none; }
+.result-title { font-weight: 600; }
+.result-context { color: var(--color-muted); font-size: 0.95rem; margin-top: 0.3rem; }
+.result-score { font-size: 0.8rem; color: var(--color-muted); }
+mark { background: #fef08a; padding: 0.1rem 0.2rem; border-radius: 2px; }
+
+/* Diff */
+.diff-line { font-family: var(--font-mono); font-size: 0.85rem; white-space: pre-wrap; padding: 0.1rem 0.5rem; }
+.diff-add { background: var(--color-green-bg); color: var(--color-green); }
+.diff-del { background: var(--color-red-bg); color: var(--color-red); }
+.diff-hunk { color: var(--color-accent); font-weight: 600; margin-top: 1rem; }
+
+/* Versie-tijdlijn */
+.timeline { list-style: none; border-left: 3px solid var(--color-accent-light); padding-left: 1.5rem; }
+.timeline li { margin: 1rem 0; position: relative; }
+.timeline li::before {
+    content: "";
+    position: absolute;
+    left: -1.85rem;
+    top: 0.4rem;
+    width: 10px;
+    height: 10px;
+    background: var(--color-accent);
+    border-radius: 50%;
+}
+.timeline-date { font-weight: 700; color: var(--color-accent); }
+
+/* Hero (homepage) */
+.hero { text-align: center; padding: 3rem 0 2rem; }
+.hero h1 { font-size: 2.5rem; }
+.hero .subtitle { font-size: 1.2rem; }
+.hero blockquote {
+    font-style: italic;
+    color: var(--color-muted);
+    margin: 1.5rem auto;
+    max-width: 500px;
+    font-size: 0.95rem;
+}
+
+/* Stats */
+.stats { display: flex; gap: 2rem; justify-content: center; margin: 2rem 0; flex-wrap: wrap; }
+.stat { text-align: center; }
+.stat-number { font-size: 2rem; font-weight: 700; color: var(--color-accent); }
+.stat-label { font-size: 0.85rem; color: var(--color-muted); }

src/wetgit/web/templates/base.html

@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html lang="nl">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <title>{% block title %}WetGit{% endblock %} — Nederlandse wetgeving als code</title>
+    <link rel="stylesheet" href="/static/style.css">
+</head>
+<body>
+    <header>
+        <div class="container">
+            <h1><a href="/">WetGit</a></h1>
+            <nav>
+                <a href="/grondwet">Grondwet</a>
+                <a href="/zoeken">Zoeken</a>
+                <a href="/historie">Historie</a>
+                <a href="/api/docs">API</a>
+            </nav>
+        </div>
+    </header>
+
+    <main class="container">
+        {% block content %}{% endblock %}
+    </main>
+
+    <footer>
+        <div class="container">
+            <p>WetGit is geen officiele bron van wetgeving. Raadpleeg altijd
+            <a href="https://wetten.overheid.nl">wetten.overheid.nl</a> voor de authentieke tekst.</p>
+            <p>Wetteksten: CC0 (publiek domein) | Tooling: MIT |
+            <a href="https://git.wetgit.nl/wetgit">git.wetgit.nl</a></p>
+        </div>
+    </footer>
+</body>
+</html>

src/wetgit/web/templates/diff.html

@@ -0,0 +1,21 @@
+{% extends "base.html" %}
+{% block title %}Diff: {{ van }} → {{ tot }}{% endblock %}
+
+{% block content %}
+<h1>Diff: Grondwet</h1>
+<p class="subtitle">{{ van }} → {{ tot }} | +{{ added }} / -{{ removed }} regels</p>
+
+<div style="background: #f8f9fa; border-radius: 6px; padding: 1rem; overflow-x: auto;">
+{% for line in diff_lines %}
+{% if line.startswith('+') and not line.startswith('+++') %}
+<div class="diff-line diff-add">{{ line }}</div>
+{% elif line.startswith('-') and not line.startswith('---') %}
+<div class="diff-line diff-del">{{ line }}</div>
+{% elif line.startswith('@@') %}
+<div class="diff-line diff-hunk">{{ line }}</div>
+{% elif not line.startswith('diff ') and not line.startswith('index ') %}
+<div class="diff-line">{{ line }}</div>
+{% endif %}
+{% endfor %}
+</div>
+{% endblock %}

src/wetgit/web/templates/historie.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+{% block title %}Historie — Grondwet{% endblock %}
+
+{% block content %}
+<h1>Historie: Grondwet</h1>
+<p class="subtitle">{{ versies|length }} versies beschikbaar. Klik op twee versies om een diff te zien.</p>
+
+<ul class="timeline">
+{% for v in versies %}
+<li>
+    <span class="timeline-date">{{ v.datum }}</span>
+    {% if not loop.last %}
+    — <a href="/diff?van={{ versies[loop.index].datum }}&tot={{ v.datum }}">diff met vorige</a>
+    {% endif %}
+</li>
+{% endfor %}
+</ul>
+{% endblock %}

src/wetgit/web/templates/index.html

@@ -0,0 +1,47 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="hero">
+    <h1>WetGit</h1>
+    <p class="subtitle">Nederlandse wetgeving als code.<br>
+    Elke wet een Markdown-bestand. Elke wijziging een Git-commit.</p>
+
+    <blockquote>In de geest van Dirk Volkertzoon Coornhert (1522-1590) — humanist,
+    graveur en voorvechter van een transparant rechtssysteem.</blockquote>
+</div>
+
+<form class="search-box" action="/zoeken" method="get">
+    <input type="text" name="q" placeholder="Zoek in de Grondwet... bijv. 'privacy' of 'mag mijn baas mijn e-mail lezen?'" autofocus>
+    <select name="mode">
+        <option value="keyword">Keyword</option>
+        <option value="semantic">Semantisch</option>
+    </select>
+    <button type="submit">Zoek</button>
+</form>
+
+<div class="stats">
+    <div class="stat">
+        <div class="stat-number">{{ stats.artikelen }}</div>
+        <div class="stat-label">artikelen</div>
+    </div>
+    <div class="stat">
+        <div class="stat-number">{{ stats.versies }}</div>
+        <div class="stat-label">historische versies</div>
+    </div>
+    <div class="stat">
+        <div class="stat-number">{{ stats.regelingen }}</div>
+        <div class="stat-label">regelingen</div>
+    </div>
+</div>
+
+<h2>Grondwet voor het Koninkrijk der Nederlanden</h2>
+
+<div class="disclaimer">
+    Dit is een AI-verrijkte weergave van de Grondwet. Raadpleeg altijd
+    <a href="https://wetten.overheid.nl/BWBR0001840">wetten.overheid.nl</a> voor de officiele tekst.
+</div>
+
+{% for h in hoofdstukken %}
+<h3><a href="/grondwet#{{ h.anchor }}">{{ h.titel }}</a></h3>
+{% endfor %}
+{% endblock %}

src/wetgit/web/templates/regeling.html

@@ -0,0 +1,20 @@
+{% extends "base.html" %}
+{% block title %}{{ titel }}{% endblock %}
+
+{% block content %}
+<h1>{{ titel }}</h1>
+<p class="subtitle">
+    <span class="tag">{{ type }}</span>
+    BWB-ID: {{ bwb_id }} |
+    <a href="https://wetten.overheid.nl/{{ bwb_id }}">Officiele tekst</a> |
+    <a href="/historie">{{ versies }} versies</a>
+    {% if has_summary %} | <a href="/grondwet/samenvatting">AI-samenvatting</a>{% endif %}
+</p>
+
+<div class="disclaimer">
+    Dit is geen officiele bron. Raadpleeg altijd
+    <a href="https://wetten.overheid.nl/{{ bwb_id }}">wetten.overheid.nl</a>.
+</div>
+
+{{ content_html | safe }}
+{% endblock %}

src/wetgit/web/templates/samenvatting.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+{% block title %}Samenvatting — Grondwet{% endblock %}
+
+{% block content %}
+<h1>Samenvatting: Grondwet</h1>
+<p class="subtitle">AI-gegenereerde samenvatting in begrijpelijk Nederlands (B1-niveau)</p>
+
+<div class="disclaimer">
+    Dit is een AI-gegenereerde samenvatting en geen juridisch advies.
+    Raadpleeg altijd <a href="https://wetten.overheid.nl/BWBR0001840">wetten.overheid.nl</a>.
+</div>
+
+{{ content_html | safe }}
+
+<p style="margin-top: 2rem;">
+    <a href="/grondwet">Terug naar de volledige tekst</a>
+</p>
+{% endblock %}

src/wetgit/web/templates/zoeken.html

@@ -0,0 +1,35 @@
+{% extends "base.html" %}
+{% block title %}Zoeken{% endblock %}
+
+{% block content %}
+<h1>Zoeken</h1>
+
+<form class="search-box" action="/zoeken" method="get">
+    <input type="text" name="q" value="{{ query }}" placeholder="Zoek in alle wetgeving..." autofocus>
+    <select name="mode">
+        <option value="keyword" {% if mode == 'keyword' %}selected{% endif %}>Keyword</option>
+        <option value="semantic" {% if mode == 'semantic' %}selected{% endif %}>Semantisch</option>
+    </select>
+    <button type="submit">Zoek</button>
+</form>
+
+{% if query %}
+<p class="subtitle">{{ results|length }} resultaten voor "{{ query }}"
+{% if mode == 'semantic' %} (semantisch zoeken){% endif %}</p>
+
+{% for r in results %}
+<div class="result">
+    <div class="result-title">
+        <a href="/grondwet#artikel-{{ r.artikel.split(' ')[-1] }}">{{ r.artikel }}</a>
+        — {{ r.titel }}
+        {% if r.score %}<span class="result-score">({{ "%.1f"|format(r.score * 100) }}% match)</span>{% endif %}
+    </div>
+    <div class="result-context">{{ r.context[:200] }}</div>
+</div>
+{% endfor %}
+
+{% if not results %}
+<p>Geen resultaten gevonden.</p>
+{% endif %}
+{% endif %}
+{% endblock %}