Make browser context network-aware and render Mermaid diagrams #117
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| import { useEffect, useId, useState } from "react" | ||
| import { CopyButton } from "../ui/copy-button" | ||
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| type MermaidTheme = "default" | "dark" | ||
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| type DiagramState = | ||
| | { status: "loading" } | ||
| | { status: "ready"; svg: string } | ||
| | { status: "error" } | ||
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| let renderSequence = 0 | ||
| let renderQueue = Promise.resolve() | ||
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| function currentTheme(): MermaidTheme { | ||
| if (typeof document === "undefined") return "default" | ||
| return document.documentElement.classList.contains("dark") ? "dark" : "default" | ||
| } | ||
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| function queueRender(source: string, id: string, theme: MermaidTheme) { | ||
| const render = renderQueue.then(async () => { | ||
| const { default: mermaid } = await import("mermaid") | ||
| mermaid.initialize({ | ||
| startOnLoad: false, | ||
| securityLevel: "strict", | ||
| suppressErrorRendering: true, | ||
| theme, | ||
| flowchart: { useMaxWidth: true }, | ||
| }) | ||
| return mermaid.render(id, source) | ||
| }) | ||
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| renderQueue = render.then(() => undefined, () => undefined) | ||
| return render | ||
| } | ||
|
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| export function MermaidDiagram({ source }: { source: string }) { | ||
| const reactId = useId().replace(/[^a-zA-Z0-9_-]/g, "") | ||
| const [theme, setTheme] = useState<MermaidTheme>(currentTheme) | ||
| const [state, setState] = useState<DiagramState>({ status: "loading" }) | ||
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| useEffect(() => { | ||
| const root = document.documentElement | ||
| const observer = new MutationObserver(() => setTheme(currentTheme())) | ||
| observer.observe(root, { attributes: true, attributeFilter: ["class"] }) | ||
| return () => observer.disconnect() | ||
| }, []) | ||
|
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| useEffect(() => { | ||
| let cancelled = false | ||
| setState({ status: "loading" }) | ||
| renderSequence += 1 | ||
|
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| void queueRender(source, `kanna-mermaid-${reactId}-${renderSequence}`, theme) | ||
| .then(({ svg }) => { | ||
| if (!cancelled) setState({ status: "ready", svg }) | ||
| }) | ||
| .catch(() => { | ||
| if (!cancelled) setState({ status: "error" }) | ||
| }) | ||
|
|
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| return () => { | ||
| cancelled = true | ||
| } | ||
| }, [reactId, source, theme]) | ||
|
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| if (state.status === "ready") { | ||
| return ( | ||
| <div | ||
| data-mermaid-diagram | ||
| role="img" | ||
| aria-label="Mermaid diagram" | ||
| className="my-3 max-w-full overflow-x-auto rounded-xl border border-border bg-background p-4 [&_svg]:mx-auto [&_svg]:h-auto [&_svg]:max-w-full" | ||
| dangerouslySetInnerHTML={{ __html: state.svg }} | ||
| /> | ||
| ) | ||
| } | ||
|
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| if (state.status === "error") { | ||
| return ( | ||
| <div data-mermaid-diagram className="group/mermaid relative my-3 max-w-full overflow-x-auto rounded-xl border border-border bg-background"> | ||
| <div className="border-b border-border px-3.5 py-2 text-xs text-muted-foreground"> | ||
| Unable to render Mermaid diagram. Showing source instead. | ||
| </div> | ||
| <pre className="min-w-0 px-3.5 py-2.5"><code className="block text-xs whitespace-pre">{source}</code></pre> | ||
| <CopyButton | ||
| text={source} | ||
| className="absolute right-1.5 top-1.5 h-8 w-8 text-muted-foreground opacity-0 transition-opacity group-hover/mermaid:opacity-100" | ||
| /> | ||
| </div> | ||
| ) | ||
| } | ||
|
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| return ( | ||
| <div | ||
| data-mermaid-diagram | ||
| aria-label="Rendering Mermaid diagram" | ||
| aria-busy="true" | ||
| className="my-3 h-40 max-w-full animate-pulse rounded-xl border border-border bg-muted/40" | ||
| /> | ||
| ) | ||
| } |
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Workspace attachments always use
size: 0, which bypasses the classifier's existing large-JSON guard. JSON files above the preview threshold therefore open in the modal, are truncated by the text preview reader, and can no longer be parsed or formatted as JSON instead of following the large-file new-tab path. Obtain the actual file size before classification or classify workspace files without relying on a fabricated zero size.