作为String类方法(仅限Unix):

class String
def black;          "\e[30m#{self}\e[0m" end
def red;            "\e[31m#{self}\e[0m" end
def green;          "\e[32m#{self}\e[0m" end
def brown;          "\e[33m#{self}\e[0m" end
def blue;           "\e[34m#{self}\e[0m" end
def magenta;        "\e[35m#{self}\e[0m" end
def cyan;           "\e[36m#{self}\e[0m" end
def gray;           "\e[37m#{self}\e[0m" end

def bg_black;       "\e[40m#{self}\e[0m" end
def bg_red;         "\e[41m#{self}\e[0m" end
def bg_green;       "\e[42m#{self}\e[0m" end
def bg_brown;       "\e[43m#{self}\e[0m" end
def bg_blue;        "\e[44m#{self}\e[0m" end
def bg_magenta;     "\e[45m#{self}\e[0m" end
def bg_cyan;        "\e[46m#{self}\e[0m" end
def bg_gray;        "\e[47m#{self}\e[0m" end

def bold;           "\e[1m#{self}\e[22m" end
def italic;         "\e[3m#{self}\e[23m" end
def underline;      "\e[4m#{self}\e[24m" end
def blink;          "\e[5m#{self}\e[25m" end
def reverse_color;  "\e[7m#{self}\e[27m" end
end

和用法:

puts "I'm back green".bg_green
puts "I'm red and back cyan".red.bg_cyan
puts "I'm bold and green and backround red".bold.green.bg_red

在我的控制台:

此外,

def no_colors
  self.gsub /\e\[\d+m/, ""
end

删除格式化字符。

Note

puts "\e[31m" # set format (red foreground)
puts "\e[0m"   # clear format
puts "green-#{"red".red}-green".green # will be green-red-normal, because of \e[0

您可以在控制台中使用ANSI转义序列来完成此操作。我知道这适用于Linux和Mac OS X，但我不确定Windows控制台(cmd)是否支持ANSI。

我是用Java写的，但思想是一样的。

// Foreground color
public static final String BLACK_TEXT()   { return "\033[30m";}
public static final String RED_TEXT()     { return "\033[31m";}
public static final String GREEN_TEXT()   { return "\033[32m";}
public static final String BROWN_TEXT()   { return "\033[33m";}
public static final String BLUE_TEXT()    { return "\033[34m";}
public static final String MAGENTA_TEXT() { return "\033[35m";}
public static final String CYAN_TEXT()    { return "\033[36m";}
public static final String GRAY_TEXT()    { return "\033[37m";}

// Background color
public static final String BLACK_BACK()   { return "\033[40m";}
public static final String RED_BACK()     { return "\033[41m";}
public static final String GREEN_BACK()   { return "\033[42m";}
public static final String BROWN_BACK()   { return "\033[43m";}
public static final String BLUE_BACK()    { return "\033[44m";}
public static final String MAGENTA_BACK() { return "\033[45m";}
public static final String CYAN_BACK()    { return "\033[46m";}
public static final String WHITE_BACK()   { return "\033[47m";}

// ANSI control characters
public static final String RESET_COLORS() { return "\033[0m";}
public static final String BOLD_ON()      { return "\033[1m";}
public static final String BLINK_ON()     { return "\033[5m";}
public static final String REVERSE_ON()   { return "\033[7m";}
public static final String BOLD_OFF()     { return "\033[22m";}
public static final String BLINK_OFF()    { return "\033[25m";}
public static final String REVERSE_OFF()  { return "\033[27m";}

这可能会帮助你:彩色红宝石输出

以下是我不需要任何宝石就能让它工作的方法:

def red(mytext) ; "\e[31m#{mytext}\e[0m" ; end
puts red("hello world")

然后，只有引号中的文本是有颜色的，您将返回到定期安排的节目。

我发现前面的答案很有用。但是，如果我想在不使用任何第三方库的情况下对日志输出等内容进行着色，那么它们就不适合。下面的方法帮我解决了这个问题:

red = 31
green = 32
blue = 34

def color (color=blue)
  printf "\033[#{color}m";
  yield
  printf "\033[0m"
end

color { puts "this is blue" }
color(red) { logger.info "and this is red" }

我发现了一些:

http://github.com/ssoroka/ansi/tree/master

例子:

puts ANSI.color(:red) { "hello there" }
puts ANSI.color(:green) + "Everything is green now" + ANSI.no_color

http://flori.github.com/term-ansicolor/

例子:

print red, bold, "red bold", reset, "\n"
print red(bold("red bold")), "\n"
print red { bold { "red bold" } }, "\n"

http://github.com/sickill/rainbow

例子:

puts "this is red".foreground(:red) + " and " + "this on yellow bg".background(:yellow) + " and " + "even bright underlined!".underline.bright

如果你在Windows上，你可能需要做一个“gem install win32console”来启用对颜色的支持。

另外，如果您需要创建自己的gem，为控制台Ruby-script输出着色这篇文章也很有用。它解释了如何向字符串添加ANSI着色。你可以用这个知识把它包装在一些类中，这些类扩展了字符串或其他东西。