将3个空格缩进的文件转换成4个空格的文件. 3个空格真的是异端啊.

3to4.rb

#!/usr/bin/ruby

# 将用三个空格缩进的变成四个空格缩进
file_name = ARGV[0]

lines = File.read(file_name)

lines.split("\n").each do |line|
  sp_count = 0
  while line[count] == " " do
    sp_count = count + 1
  end

  tab_count = sp_count / 3

  for c in 1..tab_count
    print " "
  end

  print line + "\n"
end