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Query GitHub’s Linguist library for colors for programming languages.
$ linguist-termcolor for rust rgb #dea584 xterm 180 rust
You can query with language names or file extensions.
§xterm colors and color distances
For finding the nearest xterm colors, a --colors/-c option is available for specifying
the color model or color space in which to calculate
color differences using color_art::distance_with.
The default is RGB, which may not actually yield the best result in terms of human perception.
For finding colors that “look” the closest, CIELAB is a reasonable choice; use it with -c lab.
See ColorSpace for available choices.
For example, here are the different results for "python" using RGB, CMYK, and CIELAB, respectively.
$ linguist-termcolor -c rgb for python rgb #3572a5 xterm 61 python
$ linguist-termcolor -c cmyk for python rgb #3572a5 xterm 67 python
$ linguist-termcolor -c lab for python rgb #3572a5 xterm 24 python