forked from extern/nix-config
60 lines
2.1 KiB
Crystal
60 lines
2.1 KiB
Crystal
##################################################################################
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#
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# New Start: A modern Arch workflow built with an emphasis on functionality.
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# Copyright (C) 2017 Donovan Glover
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#
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# Trucolor: A library that makes colorful output trivial.
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# Copyright (C) 2017 Donovan Glover
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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##################################################################################
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module Trucolor
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# Formats a string *str* with the colors given in the turple *rgb* (0 <= rgb[i] <= 255)
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def self.format(rgb, str)
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return "\x1b[38;2;#{rgb[0]};#{rgb[1]};#{rgb[2]}m#{str}\x1b[0m"
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end
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# Goes through the colors in such a way that only 256 colors are used (0 <= n <= 255)
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# @requires self.format()
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def self.rainbow(n)
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h = n / 43
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f = n - 43 * h
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t = f * 255 / 43
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q = 255 - t
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case h
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when 0; return {255, t, 0}
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when 1; return {q, 255, 0}
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when 2; return {0, 255, t}
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when 3; return {0, q, 255}
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when 4; return {t, 0, 255}
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when 5; return {255, 0, q}
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end
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return {0, 0, 0}
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end
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# Tests the format method by printing a rainbow of colors
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# @requires self.rainbow()
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def self.test()
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n = -1
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while (n += 1) < 256
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print self.format(self.rainbow(n), "#{n}".rjust(3, '0')) + " "
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print "\n" if (n + 1) % 16 == 0
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end
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end
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end
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