old_contents: #!/usr/bin/env node
  
  var fs = require('fs')
  var path = require('path')
  var chalk = require('chalk')
  
  function show (result) {
    Object.keys(result).sort().reverse().forEach(file => {
      var test = file.replace(/\.test\.js\.snap$/, '')
      result[file].split('exports[`')
        .filter(str => str.indexOf('// ') !== 0)
        .forEach(str => {
          if (str.trim().length === 0) return
          var parts = str.replace(/"\s*`;\s*$/, '').split(/`] = `\s*"/)
          process.stdout.write(
            chalk.gray(`${ test } ${ parts[0].replace(/ 1$/, '') }:\n\n`))
          process.stdout.write(parts[1])
        })
    })
  }
  
  fs.readdir(__dirname, (err, list) => {
    if (err) throw err
    var snaps = list.filter(i => /\.snap$/.test(i))
  
    var result = { }
    snaps.forEach(file => {
      fs.readFile(path.join(__dirname, file), (err2, content) => {
        if (err2) throw err2
        result[file] = content.toString()
        if (Object.keys(result).length === snaps.length) show(result)
      })
    })
  })
  
new_contents: #!/usr/bin/env node
  
  var fs = require('fs')
  var path = require('path')
  var chalk = require('chalk')
  
  var filter = process.argv[2]
  
  function show (result) {
    Object.keys(result).sort().reverse().forEach(file => {
      var test = file.replace(/\.test\.js\.snap$/, '')
      result[file].split('exports[`')
        .filter(str => str.indexOf('// ') !== 0)
        .filter(str => !filter || str.indexOf(filter) !== -1)
        .forEach(str => {
          if (str.trim().length === 0) return
          var parts = str.replace(/"\s*`;\s*$/, '').split(/`] = `\s*"/)
          process.stdout.write(
            chalk.gray(`${ test } ${ parts[0].replace(/ 1$/, '') }:\n\n`))
          process.stdout.write(parts[1])
        })
    })
  }
  
  fs.readdir(__dirname, (err, list) => {
    if (err) throw err
    var snaps = list.filter(i => /\.snap$/.test(i))
  
    var result = { }
    snaps.forEach(file => {
      fs.readFile(path.join(__dirname, file), (err2, content) => {
        if (err2) throw err2
        result[file] = content.toString()
        if (Object.keys(result).length === snaps.length) show(result)
      })
    })
  })
  
subject: Add filters to snapshot preview