Make a markdown table pretty by creating uniform column spacing

columns_to_markdown

#!/usr/bin/env ruby -wU

# Takes your paste buffer and outputs a markdown table with pretty spacing
content = `pbpaste`.strip

def columnize(line)
  line.sub(/\A\s*\|?(.*)\|?\Z/, '\1').split("|")
end
lines = content.split("\n")
column_count = columnize(lines.first).size

widths = (0...column_count).collect {|a| 0 }

lines.each do |line|
  columns = columnize(line)
  (0...column_count).each do |i|
    next if columns[i].to_s.strip =~ /\A-+\Z/
    size = columns[i].to_s.strip.size
    widths[i] = size if size > widths[i]
  end
end

resulting_lines = lines.collect do |line|
  columns = columnize(line)
  row = []
  (0...column_count).each do |i|
    if columns[i].to_s.strip =~ /\A-+\Z/
      row << ('-' * (widths[i] + 2))
    else
      row << sprintf(" % -#{widths[i]}s ", columns[i].to_s.strip)
    end
  end
  "|" + row.join("|") + "|"
end

STDOUT.puts resulting_lines.join("\n")