feat(core): use virtual files and pipply

core/src/virtual-files.ts

@@ -0,0 +1,104 @@
+import { useCallback, useMemo } from 'react'
+import { atom, useAtom, useStore } from 'jotai'
+
+type VFile = {
+  path: string
+  readonly data?: Record<string, unknown>
+  readonly filename: string
+  readonly extname: string
+  readonly dirname: string
+  readonly basename: string
+  readonly isLink: boolean
+  readonly isDirectory: boolean
+  readonly isBuffer?: boolean
+} & (
+  | {
+    readonly isBuffer: true
+    readonly contents: Buffer
+  }
+  | {
+    readonly isBuffer?: false
+    readonly contents: string
+  }
+)
+
+export const VFileLinkPath = Symbol('VFileLinkPath')
+
+export interface CreateVFileProps<
+  C extends string | Buffer
+> {
+  path: string, contents: C, data?: Record<string | symbol, unknown>
+}
+export const createVFile = <
+  C extends string | Buffer,
+  IsBuffer extends boolean = C extends Buffer ? true : false
+>({ path, contents, data }: CreateVFileProps<C>) => ({
+    path,
+    data,
+    contents,
+    get basename() { return path.slice(path.lastIndexOf('/') + 1) },
+    get filename() { return this.basename + this.extname },
+    get extname() { return path.slice(path.lastIndexOf('.')) },
+    get dirname() { return path.slice(0, path.lastIndexOf('/')) },
+    get isLink() {
+      return data?.[VFileLinkPath] != null
+    },
+    get isDirectory() {
+      return this.path.endsWith('/')
+    },
+    get isBuffer() {
+      return Buffer.isBuffer(this.contents) as IsBuffer
+    }
+  })
+
+interface Pipply {
+  <A0, T0, B0, T1>(fn: (a0: A0) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, b0: B0) => T1
+  <A0, A1, T0, B0, T1>(fn: (a0: A0, a1: A1) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, b0: B0) => T1
+  <A0, A1, A2, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, b0: B0) => T1
+  <A0, A1, A2, A3, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, b0: B0) => T1
+  <A0, A1, A2, A3, A4, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, b0: B0) => T1
+  <A0, A1, A2, A3, A4, A5, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, b0: B0) => T1
+  <A0, A1, A2, A3, A4, A5, A6, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, b0: B0) => T1
+  <A0, A1, A2, A3, A4, A5, A6, A7, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, b0: B0) => T1
+  <A0, A1, A2, A3, A4, A5, A6, A7, A8, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8, b0: B0) => T1
+  <A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8, a9: A9) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8, a9: A9, b0: B0) => T1
+  <A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, T0, B0, T1>(fn: (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8, a9: A9, a10: A10) => T0, fn2: (rt: T0, b0: B0) => T1): (a0: A0, a1: A1, a2: A2, a3: A3, a4: A4, a5: A5, a6: A6, a7: A7, a8: A8, a9: A9, a10: A10, b0: B0) => T1
+}
+const pipply: Pipply = (fn: Function, fn2: Function) => (...args: unknown[]) => fn2(
+  fn(...args.slice(0, args.length - 1)),
+  args[args.length - 1]
+)
+
+export const vFilesAtom = atom<VFile[]>([])
+
+export const useVFiles = () => {
+  const [
+    vFiles, setVFiles
+  ] = useAtom(vFilesAtom, { store: useStore() })
+  return {
+    vFiles,
+    setVFiles,
+    setVFile: useMemo(() => pipply(createVFile, (rt, index?: number) => {
+      const rtAlias = rt as VFile
+      if (index === undefined) {
+        setVFiles([...vFiles, rtAlias])
+      } else if (index === -1) {
+        setVFiles([rtAlias, ...vFiles])
+      } else {
+        const nt = [...vFiles]
+        nt[index] = rtAlias
+        setVFiles(nt)
+      }
+      return rt
+    }), [vFiles, setVFiles]),
+    removeVFile: useCallback((path: string) => {
+      setVFiles(vFiles.filter(vFile => vFile.path !== path))
+    }, [vFiles, setVFiles]),
+    removeAllVFiles: useCallback(() => {
+      setVFiles([])
+    }, [setVFiles]),
+    getVFile: useCallback((path: string) => {
+      return vFiles.find(vFile => vFile.path === path)
+    }, [vFiles])
+  }
+}