filesize to human

filesize.groovy

// Convert a number of bytes to a more readable string
// Written this way (with attrs), as I was using it for a Grails taglib
def filesize = {
  attrs ->labels = [' bytes', 'KB', 'MB', 'GB', 'TB']
  size = attrs.size
  label = labels.find {
    if (size < 1024) {
      true
    }
    else {
      size /= 1024
      false
    }
  }
  "${new java.text.DecimalFormat( attrs.format ?: '0.##' ).format( size )}$label"
}

assert filesize([size: 1000]) == '1000 bytes'
assert filesize([size: 1024]) == '1KB'
assert filesize([size: 10000000]) == '9.54MB'
assert filesize([size: 10000000, format: '0.000']) == '9.537MB'
assert filesize([size: 10000000, format: '0']) == '10MB'