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;\n\t\treturn this.props.children;\n\t}\n}\n\nexport type CodeViewProps = {\n\tkind: Extract;\n\t/** The fence's contents, as the document holds them. */\n\tsource: string;\n\tlanguage: string;\n\t/** The rest of the info string, which is where a title lives. */\n\tmeta: string;\n};\n\nexport function CodeView(props: CodeViewProps) {\n\treturn (\n\t\t\n\t\t\t\n\t\t\n\t);\n}\n\nfunction View({ kind, source, language, meta }: CodeViewProps) {\n\tlet [renderer, setRenderer] = useState();\n\tlet [broken, setBroken] = useState(false);\n\tlet [resolved, setResolved] = useState();\n\n\tuseEffect(() => {\n\t\tlet live = true;\n\t\tload().then(\n\t\t\tvalue => {\n\t\t\t\tif (live) setRenderer(value);\n\t\t\t},\n\t\t\terror => {\n\t\t\t\tconsole.error(\"[plan] could not load the code renderer:\", error);\n\t\t\t\tif (live) setBroken(true);\n\t\t\t},\n\t\t);\n\t\treturn () => {\n\t\t\tlive = false;\n\t\t};\n\t}, []);\n\n\tuseEffect(() => {\n\t\tif (!renderer) return;\n\t\tlet live = true;\n\t\tvoid grammar(language, renderer.resolveLanguage).then(value => {\n\t\t\tif (live) setResolved(value);\n\t\t});\n\t\treturn () => {\n\t\t\tlive = false;\n\t\t};\n\t}, [renderer, language]);\n\n\t/*\n\t * Everything handed to the library is memoised, and not as a courtesy: it\n\t * compares by reference to decide whether anything changed, so a fresh\n\t * object on every keystroke elsewhere in the plan would re-render and\n\t * re-highlight every block on the page.\n\t */\n\tlet file = useMemo(\n\t\t() => ({ name: fileNameOf(language, meta), contents: source, lang: resolved ?? PLAIN }),\n\t\t[language, meta, source, resolved],\n\t);\n\n\tlet patch = useMemo(() => {\n\t\tif (kind !== \"diff\" || !renderer) return undefined;\n\t\ttry {\n\t\t\tlet read = renderer.parsePatchFiles(repaired(source), undefined, true);\n\t\t\tlet files = read.flatMap(patch => patch.files);\n\t\t\treturn files.length > 0 ? files : undefined;\n\t\t} catch {\n\t\t\t// Not a patch. Said by the parser rather than guessed at here,\n\t\t\t// which is the only reading of the format that cannot drift.\n\t\t\treturn undefined;\n\t\t}\n\t}, [kind, renderer, source]);\n\n\tlet options = useMemo(\n\t\t() => ({\n\t\t\ttheme: THEME,\n\t\t\tthemeType: \"light\" as const,\n\t\t\t// A diff's fallback has no title in the block's own header.\n\t\t\tdisableFileHeader: kind !== \"diff\" || !titled(meta),\n\t\t\tdisableLineNumbers: true,\n\t\t\toverflow: \"scroll\" as const,\n\t\t\tdisableWorkerPool: true,\n\t\t}),\n\t\t[kind, meta],\n\t);\n\n\tlet diffOptions = useMemo(\n\t\t() => ({\n\t\t\ttheme: THEME,\n\t\t\tthemeType: \"light\" as const,\n\t\t\t// Three panes wide, so side by side would be two unreadable\n\t\t\t// columns. The filename comes from the patch and is the whole\n\t\t\t// point of rendering one, so its header stays.\n\t\t\tdiffStyle: \"unified\" as const,\n\t\t\t/*\n\t\t\t * A patch carries only what it changed, so there is nothing to\n\t\t\t * expand into: the separator that offers to expand would be a\n\t\t\t * control that cannot work. `metadata` says `@@ -60,6 +60,22 @@`,\n\t\t\t * which is what the source says too.\n\t\t\t */\n\t\t\thunkSeparators: \"metadata\" as const,\n\t\t\toverflow: \"scroll\" as const,\n\t\t\tdisableWorkerPool: true,\n\t\t}),\n\t\t[],\n\t);\n\n\tif (broken) return

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