| 1 | import { type ReactNode, Suspense, lazy, useEffect, useRef, useState, useSyncExternalStore } from "react"; |
| 2 | |
| 3 | import { cn } from "../lib/cn"; |
| 4 | import { Kbd } from "./ui/kbd"; |
| 5 | import { paletteKeyLabel } from "../lib/shortcut"; |
| 6 | |
| 7 | /* |
| 8 | * The ⌘K palette. The dialog itself, with its search and its dependencies, |
| 9 | * loads the first time it is opened, so pages that never open it do not |
| 10 | * carry it. |
| 11 | */ |
| 12 | const Dialog = lazy(() => import("./command-palette-dialog")); |
| 13 | |
| 14 | /** |
| 15 | * A page the palette can jump to (`to`), or something it does in place |
| 16 | * (`run`, listed under Commands), such as switching the theme. |
| 17 | */ |
| 18 | export type PaletteCommand = { label: string; hint?: string; icon: ReactNode } & ({ to: string; run?: undefined } | { run: () => void; to?: undefined }); |
| 19 | |
| 20 | /** Opens and closes the palette on ⌘K or Ctrl-K, from anywhere on the page. */ |
| 21 | export function usePaletteShortcut(toggle: () => void) { |
| 22 | const latest = useRef(toggle); |
| 23 | latest.current = toggle; |
| 24 | useEffect(() => { |
| 25 | const onKey = (event: KeyboardEvent) => { |
| 26 | if ((event.metaKey || event.ctrlKey) && event.key.toLowerCase() === "k") { |
| 27 | event.preventDefault(); |
| 28 | latest.current(); |
| 29 | } |
| 30 | }; |
| 31 | window.addEventListener("keydown", onKey); |
| 32 | return () => window.removeEventListener("keydown", onKey); |
| 33 | }, []); |
| 34 | } |
| 35 | |
| 36 | const never = () => () => {}; |
| 37 | |
| 38 | function platform(): string { |
| 39 | const nav = navigator as Navigator & { userAgentData?: { platform?: string } }; |
| 40 | return nav.userAgentData?.platform || nav.platform || nav.userAgent; |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * The palette's shortcut as this computer writes it: ⌘K on a Mac, Ctrl K |
| 45 | * elsewhere. Not shown on a touch screen, which has no keyboard to press it. |
| 46 | */ |
| 47 | export function PaletteKey({ className }: { className?: string }) { |
| 48 | // The server cannot know the computer: it says ⌘K, and the browser corrects it. |
| 49 | const label = useSyncExternalStore(never, () => paletteKeyLabel(platform()), () => "⌘K"); |
| 50 | return <Kbd className={cn(className, "pointer-coarse:hidden")}>{label}</Kbd>; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * ⌘K: pages and actions from what the page already knows, and, as someone |
| 55 | * types, repositories, issues, pull requests and people from search |
| 56 | * (command-palette-dialog.tsx). |
| 57 | */ |
| 58 | export function CommandPalette(props: { |
| 59 | open: boolean; |
| 60 | onOpenChange: (open: boolean) => void; |
| 61 | commands: PaletteCommand[]; |
| 62 | /** The repository being looked at, `owner/name`, to offer searching its code. */ |
| 63 | repo?: string | null; |
| 64 | }) { |
| 65 | const [wanted, setWanted] = useState(props.open); |
| 66 | useEffect(() => { |
| 67 | if (props.open) setWanted(true); |
| 68 | }, [props.open]); |
| 69 | // What had focus when it opened, the button or the page, to give it back |
| 70 | // on closing: the dialog has no trigger of its own to return to. |
| 71 | const opener = useRef<HTMLElement | null>(null); |
| 72 | const wasOpen = useRef(false); |
| 73 | if (props.open && !wasOpen.current && typeof document !== "undefined") { |
| 74 | opener.current = document.activeElement instanceof HTMLElement ? document.activeElement : null; |
| 75 | } |
| 76 | wasOpen.current = props.open; |
| 77 | if (!wanted) return null; |
| 78 | return ( |
| 79 | <Suspense fallback={null}> |
| 80 | <Dialog |
| 81 | {...props} |
| 82 | onCloseAutoFocus={(event) => { |
| 83 | event.preventDefault(); |
| 84 | if (opener.current?.isConnected) opener.current.focus(); |
| 85 | }} |
| 86 | /> |
| 87 | </Suspense> |
| 88 | ); |
| 89 | } |