current-win-explorer-selection.ts

// Name: Get current Windows Explorer selection

import "@johnlindquist/kit"

import ffi from "ffi-napi"
import winax from "winax"

// Load user32.dll functions for window interaction using ffi-napi
const user32 = new ffi.Library("user32", {
  GetForegroundWindow: ["long", []],
  GetClassNameA: ["int", ["long", "string", "int"]],
})

// Function to get class of the current active window
function getActiveWindowClass() {
  const hwnd = user32.GetForegroundWindow()
  const buf = Buffer.alloc(256)
  user32.GetClassNameA(hwnd, buf, 256)
  return buf.toString()
}

// Function to get selected items in Explorer
async function getExplorerSelection() {
  const selectedPaths = []
  const className = getActiveWindowClass()

  // Check if the window class matches Explorer classes
  if (!/^(Progman|WorkerW|(Cabinet|Explore)WClass).*$/.test(className)) {
    return undefined
  }

  // Use ActiveX to interact with Shell.Application
  const shell = new winax.Object("Shell.Application")
  const windows = shell.Windows()

  for (let i = 0; i < windows.Count; i++) {
    const window = windows.Item(i)
    if (window && window.HWND === user32.GetForegroundWindow()) {
      const items = window.Document.SelectedItems()
      for (let j = 0; j < items.Count; j++) {
        selectedPaths.push(items.Item(j).Path)
      }
      break
    }
  }
  return selectedPaths
}

const selectedPaths = await getExplorerSelection()

if (selectedPaths === undefined) {
  exit()
}

const cache = await db("win-current-selection", { paths: [] }, true)

const previous = cache.paths

if (JSON.stringify(selectedPaths) === JSON.stringify(previous)) {
  exit()
}

cache.paths = selectedPaths
console.log({ selectedPaths })
await cache.write()