Include invert to color functions

Currently I’m using color: hsl(hue(@black), saturation(@black), 100 - lightness(@black)); to invert colors but color: invert(@color) would be much better syntax for the job.

The code for function:

    invert: function (color) {
        var rgb = [255 - color.rgb[0],
                   255 - color.rgb[1],
                   255 - color.rgb[2]]; 
        return new(tree.Color)(rgb);
    },  

I tested it with less.js 1.2.1 so it works

[ascottmccauley]

+1 for this: Just to clarify, do you mean that you are using

hsl(hue(@color), saturation(@color), 100 - lightness(@color));

[seven-phases-max]

Not really the negation. The javascript code posted by @Oskariok is simple Less (#fff - @color) or equal difference(#fff, @color). However the Less code suggested by @ascottmccauley later is not the same, it only inverts colour lightness (so Less and javascript snippets of the first post do not match each other). “Invert lightness” can also be achieved with less verbose: spin((#fff - @color), 180);