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const url = require('url')
const path = require('path')
const launch = require('launch-editor')

module.exports = (specifiedEditor, srcRoot, onErrorCallback) => {
  if (typeof specifiedEditor === 'function') {
    onErrorCallback = specifiedEditor
    specifiedEditor = undefined
  }

  if (typeof srcRoot === 'function') {
    onErrorCallback = srcRoot
    srcRoot = undefined
  }

  srcRoot = srcRoot || process.cwd()

  return function launchEditorMiddleware (req, res, next) {
    const { file } = url.parse(req.url, true).query || {}
    if (!file) {
      res.statusCode = 500
      res.end(`launch-editor-middleware: required query param "file" is missing.`)
    } else {
      launch(path.resolve(srcRoot, file), specifiedEditor, onErrorCallback)
      res.end()
    }
  }
}