const _ = require('rollup-pluginutils')
const hasRequireContext = require('./helper/has-require-context')
const gernerateRequireContextCode = require('./helper/generate-require-context-code')

module.exports = function plugin (options = {}) {
  const filter = _.createFilter(options.include || ['**/*.js'], options.exclude || 'node_modules/**')
  return {
    name: 'require_content',
    async transform (code, id) {
      if (!filter(id) || !hasRequireContext(code)) {
        return
      }
      code = await gernerateRequireContextCode(id, code)
      return code
    }
  }
}