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colorize
Ruby string class extension. It add some methods to set color, background color and text effect on console easier using ANSI escape sequences.
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InfluxDB
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The named colors available through the colorize gem are defined in Colorize::ClassMethods#color_codes, L61-73. You'll notice the colors are organized into two columns of 8 colors, plus default. Any basic color terminal will support 8 colors. The next level of support is 16 colors, and finally 265 colors. IRB does something similar in Colorize::DEFAULTS on L29-L34. Note that these two classes share a name, but they're entirely different and unrelated.
Not specifically Ruby, but if you're looking to get better prompt support, I'd recommend taking a look at oh-my-powershell: https://github.com/JanDeDobbeleer/oh-my-posh (rough equivalent to the fantastic oh-my-zsh in Linux-land)