csv_to_table.rb

#!/usr/bin/ruby

require 'csv'

out = ""
rows = []

CSV.open(ARGV[0] || "changes.csv", 'r').each { |row_in| rows << row_in.map { |cell| cell.nil? ? "" : cell.to_s } }

max_lengths = {}
rows.each do |row|
  row.each_with_index { |cell, i| max_lengths[i] = cell.length if !max_lengths.key?(i) || max_lengths[i] < cell.length }
end

rows.each do |row|
  out << "|"
  row.each_with_index { |cell, i| out << " #{cell.ljust(max_lengths[i])} |" }
  out << "\n"
end

puts out