Justin Jones devpuppy
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| brew update | |
| brew versions FORMULA | |
| cd `brew --prefix` | |
| git checkout HASH Library/Formula/FORMULA.rb # use output of "brew versions" | |
| brew install FORMULA | |
| brew switch FORMULA VERSION | |
| git checkout -- Library/Formula/FORMULA.rb # reset formula | |
| ## Example: Using Subversion 1.6.17 | |
| # |
devpuppy
/ luminosity_constrast_ratio.rb
Created
March 25, 2015 21:26
Calculate the Luminosity Contrast Ratio between two colors for readability
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| # http://andora.us/blog/2011/03/03/choosing-foreground-using-luminosity-contrast-ratio/ | |
| # color contrast ratio ranges from 1 (least) to 21 (most, white/black) | |
| class Color | |
| attr_reader :r, :g, :b | |
| def initialize(hex) | |
| raise 'Invalid hex code' unless hex =~ /[0-9a-f]{6}/i | |
| hexes = hex.scan /.{2}/ | |
| @r,@g,@b = hexes.map { |h| h.hex.to_i } | |
| end |