Improve content type translation functions

[bernardodiasc]

For each Content Type there is a translation file that return the custom structured data based on an index of files of that kind.

Actual

content type from examples in this repo

// posts.js
function translation (content, contentType) {
  let output = {}
  const allFiles = content.filter(each => each.dir.includes(`/${contentType}`))
  const index = allFiles.filter(each => each.base === 'index.md')[0]
  index.attr.forEach(each => {
    allFiles.forEach(file => {
      if (file.name === each) {
        output[each] = file
      }
    })
  })
  return output
}

export default translation

// gallery.js
function translation (content, contentType) {
  let output = {}
  const allFiles = content.filter(each => each.dir.includes(`/${contentType}`))
  const index = allFiles.filter(each => each.base === 'index.md')[0]
  index.attr.forEach(each => {
    Object.keys(each).forEach(key => {
      output[key] = Object.assign({ title: each[key] }, allFiles.filter(file => file.name === key)[0])
    })
  })
  return output
}

export default translation

Expected

psedo-code bellow demonstrate what is the translation for each content type, the rest should be abstracted away to keep theses translations as simple as possible.

// posts.js
  index.attr.forEach(each => {
    allFiles.forEach(file => {
      if (file.name === each) {
        output[each] = file
      }
    })
  })

// gallery.js
  index.attr.forEach(each => {
    Object.keys(each).forEach(key => {
      output[key] = Object.assign({ title: each[key] }, allFiles.filter(file => file.name === key)[0])
    })
  })