index.js

import {
  isString,
  keys
} from 'lodash'
import multimatch from 'multimatch'
import mmm from 'mmmagic'
import debug from 'debug'

const magic = new mmm.Magic(mmm.MAGIC_MIME_TYPE)
const dbg = debug('metalsmith-mime-type')

¶ default fn

this fn is exported as the module, designed to be called by metalsmith#use

.use(move(['*', '!*.jpg'])

Params

pattern String Array

one or more multimatch patterns

export default function (pattern) {
  if (isString(pattern)) pattern = [ pattern ]
  return (files, metalsmith, done) => {
    const matches = multimatch(keys(files), pattern)
    const iterator = () => {
      const src = matches.shift()
      const meta = files[src]
      magic.detect(meta.contents, (err, mimeType) => {
        if (err) throw err
        meta.mimeType = mimeType
        dbg(`${src} > ${mimeType}`)
        if (matches.length) process.nextTick(iterator)
        else done()
      })
    }
    iterator()
  }
}