format_bytes.rb

# Formats the given byte value into a human readable form.
#
# Accepts four optional arguments that control the output format:
#   as_bits: If true, converts the given byte value to bits and adjusts the suffix accordingly. Defaults to false.
#   binary: If true, calculates order of magnitude as base 2 (binary) instead of base 10 (decimal). Defaults to true.
#   full_suffix: If true, uses full suffix names such as "Megabyte", otherwise uses abbreviations like "MB" or "Mib". Defaults to false.
#   precision: The number of decimal points to include in the output. Trailing zero's are removed. Defaults to 2.

def format_bytes(bytes, as_bits: false, binary: true, full_suffix: false, precision: 2)
  suffixes = ['', 'Kilo', 'Mega', 'Giga', 'Tera', 'Peta', 'Exa', 'Zetta', 'Yotta']
  suffixes.map! { |v| v.empty? ? '' : v[0]+'ibi' } if binary
  abbreviations = suffixes.map do |v|
    if v.empty?
      as_bits ? 'bits' : 'bytes'
    else
      v[0] + (as_bits ? 'b' : 'B')
    end
  end
  
  base = 1000
  if binary
    base = 1024
    abbreviations[1..-1].each { |v| v.insert(1,'i') unless v.empty? }
  end
  
  bytes *= 8 if as_bits
  suffixes.each { |v| v << as_bits ? 'bits' : 'bytes' }
  
  exponent = bytes.zero? ? 0 : Math.log(bytes, base).floor
  suffix = full_suffix ? suffixes[exponent] : abbreviations[exponent]
  value = sprintf("%g", (bytes.to_f / (base ** exponent)).round(precision))
  "#{value} #{suffix}"
end


# Examples
p format_bytes(2039495402, as_bits: true, binary: true)
p format_bytes(2039495402, as_bits: true, binary: false)
p format_bytes(2039495402, as_bits: false, binary: false)
p format_bytes(2039495402, as_bits: false, binary: true)

p format_bytes(2039495402, as_bits: true, binary: true, full_suffix: true)
p format_bytes(2039495402, as_bits: true, binary: false, full_suffix: true)
p format_bytes(2039495402, as_bits: false, binary: false, full_suffix: true)
p format_bytes(2039495402, as_bits: false, binary: true, full_suffix: true)

p format_bytes(96, as_bits: true, binary: true)
p format_bytes(96, as_bits: true, binary: false)
p format_bytes(96, as_bits: false, binary: false)
p format_bytes(96, as_bits: false, binary: true)

p format_bytes(96, as_bits: true, binary: true, full_suffix: true)
p format_bytes(96, as_bits: true, binary: false, full_suffix: true)
p format_bytes(96, as_bits: false, binary: false, full_suffix: true)
p format_bytes(96, as_bits: false, binary: true, full_suffix: true)