Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/fusebox/core_ext/array.rb

Instance Method Summary collapse

Instance Method Details

#to_ascii_table(keys, labels) ⇒ String

Return an ASCII table for an array of hashes

Examples:

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

Parameters:

  • keys (Array<Symbol>) —

    Which keys to display, in order

  • labels (Array<Symbol>) —

    Column headings for the keys

Returns:

  • (String)

Raises:

  • (ArgumentError) 


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# 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