class Array

Public Instance Methods

to_ascii_table(keys, labels) click to toggle source

Return an ASCII table for an array of hashes @example

[{:a => "Uno", :b => "Dos"}, {:a => "Ichi", :b => "Ni"}].to_ascii_table([:a, :b], %w(One Two))

@param [Array<Symbol>] keys Which keys to display, in order @param [Array<Symbol>] labels Column headings for the keys @return [String]

# File lib/fusebox/core_ext/array.rb, line 9
def to_ascii_table (keys, labels)
  raise ArgumentError, "`labels` length does not match `keys` length" if keys.length != labels.length
  return '' if self.length == 0
  raise ArgumentError, "expected elements to be Hash instances; instead received: #{first.inspect}" unless first.is_a?(Hash)

  widths = keys.map do |key|
    ([Hash[keys.zip(labels)]] + self).map { |row| row[key].to_s.length }.max
  end

  text = ''

  text += to_ascii_table_hr(widths)

  labels.each_with_index do |key, i|
    text += "| " + labels[i].ljust(widths[i] + 1)
  end
  text += "|\n"

  text += to_ascii_table_hr(widths)

  each do |row|
    keys.each_with_index do |key, i|
      text +=  "| " + row[key].ljust(widths[i] + 1)
    end
    text +=  "|\n"
  end

  text += to_ascii_table_hr(widths)
  text
end

Protected Instance Methods

to_ascii_table_hr(widths) click to toggle source

Print a horizonal divider calc @param [Array<Fixnum>] widths List of column widths

# File lib/fusebox/core_ext/array.rb, line 43
def to_ascii_table_hr(widths)
  '+' + '-' * (widths.inject(&:+) + widths.length * 3 - 1 ) + "+\n"
end