lini 0.7.2

Pretty diagrams from plain text, with fine-grained control. Compiles to clean, themeable SVG.
Documentation 
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<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title>lini — {{TITLE}}</title>
        <style>
            * {
                box-sizing: border-box;
            }
            html,
            body {
                margin: 0;
                height: 100%;
            }
            body {
                font:
                    13px/1.4 system-ui,
                    -apple-system,
                    sans-serif;
                background: #1c1c1c;
                display: flex;
                flex-direction: column;
            }
            header {
                flex: 0 0 auto;
                padding: 8px 16px;
                background: #111;
                color: #eee;
                border-bottom: 1px solid #333;
                display: flex;
                gap: 16px;
                align-items: center;
            }
            header strong {
                color: #6ab7ff;
                letter-spacing: 0.5px;
            }
            .status {
                font-size: 12px;
                color: #888;
                margin-left: auto;
            }
            .status.ok {
                color: #5fcf5f;
            }
            .status.err {
                color: #ff6666;
            }
            main {
                flex: 1 1 auto;
                overflow: auto;
                padding: 24px;
                display: flex;
                align-items: center;
                justify-content: center;
                background: #2a2a2a;
            }
            #svg-host {
                background: white;
                padding: 16px;
                border-radius: 6px;
                box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
                max-width: 100%;
                max-height: 100%;
            }
            #svg-host svg {
                display: block;
                max-width: 100%;
                height: auto;
            }
            #error-host {
                display: none;
                background: #2a1010;
                color: #ffaaaa;
                padding: 16px;
                border-radius: 6px;
                border: 1px solid #5a2020;
                font:
                    12px/1.5 ui-monospace,
                    monospace;
                white-space: pre-wrap;
                max-width: 80ch;
            }
        </style>
    </head>
    <body>
        <header>
            <strong>lini serve</strong>
            <span>{{TITLE}}</span>
            <span class="status" id="status">connecting…</span>
        </header>
        <main>
            <div id="svg-host"></div>
            <div id="error-host"></div>
        </main>
        <script>
            const svgHost = document.getElementById("svg-host");
            const errHost = document.getElementById("error-host");
            const status = document.getElementById("status");

            function setStatus(text, cls) {
                status.textContent = text;
                status.className = "status" + (cls ? " " + cls : "");
            }

            async function reload() {
                try {
                    const r = await fetch("/svg", { cache: "no-store" });
                    const text = await r.text();
                    if (
                        r.headers
                            .get("content-type")
                            ?.startsWith("image/svg+xml")
                    ) {
                        svgHost.innerHTML = text;
                        svgHost.style.display = "block";
                        errHost.style.display = "none";
                        setStatus(
                            "rendered " + new Date().toLocaleTimeString(),
                            "ok",
                        );
                    } else {
                        // Compile error — body is plain text.
                        errHost.textContent = text;
                        errHost.style.display = "block";
                        svgHost.style.display = "none";
                        setStatus("compile error", "err");
                    }
                } catch (e) {
                    setStatus("fetch failed: " + e.message, "err");
                }
            }

            const events = new EventSource("/events");
            events.addEventListener("reload", () => reload());
            events.onopen = () => setStatus("watching", "ok");
            events.onerror = () => setStatus("disconnected (retrying…)", "err");

            reload();
        </script>
    </body>
</html>