css - LESS - combine rules of media queries with same condition -


i using following less mixin optimize background images 2x screens.

definition::

.image-2x(@image, @width: auto, @height: auto, @repeat: no-repeat) {   @filename  : ~`/(.*)\.(jpg|jpeg|png|gif)/.exec(@{image})[1]`;   @extension : ~`/(.*)\.(jpg|jpeg|png|gif)/.exec(@{image})[2]`;   background-image: ~`"url(@{filename}.@{extension})"`;   background-repeat: @repeat;   background-size: @width @height;   @media     screen , (-webkit-min-device-pixel-ratio: 2),     screen , (   min--moz-device-pixel-ratio: 2),     screen , (        min-device-pixel-ratio: 2),     screen , (                min-resolution: 192dpi),     screen , (                min-resolution: 2dppx) {       background-image: ~`"url(@{filename}@2x.@{extension})"`;     }   } }

usage::

selector1 {   .image-2x("path/to/image1.png");  } selector2 {   .image-2x("path/to/image2.png");  }

output::

selector1 {   background-image: url(path/to/image1.png);   background-repeat: no-repeat;   background-size: auto auto; } @media   screen , (-webkit-min-device-pixel-ratio: 2),   screen , (   min--moz-device-pixel-ratio: 2),   screen , (        min-device-pixel-ratio: 2),   screen , (                min-resolution: 192dpi),   screen , (                min-resolution: 2dppx) {     selector1 {       background-image: url(path/to/image1@2x.png);     }   } } selector2 {   background-image: url(path/to/image2.png);   background-repeat: no-repeat;   background-size: auto auto; } @media   screen , (-webkit-min-device-pixel-ratio: 2),   screen , (   min--moz-device-pixel-ratio: 2),   screen , (        min-device-pixel-ratio: 2),   screen , (                min-resolution: 192dpi),   screen , (                min-resolution: 2dppx) {     selector2 {       background-image: url(path/to/image2@2x.png);     }   } }

optimal output::

selector1 {   background-image: url(path/to/image1.png);   background-repeat: no-repeat;   background-size: auto auto; } selector2 {   background-image: url(path/to/image2.png);   background-repeat: no-repeat;   background-size: auto auto; } @media   screen , (-webkit-min-device-pixel-ratio: 2),   screen , (   min--moz-device-pixel-ratio: 2),   screen , (        min-device-pixel-ratio: 2),   screen , (                min-resolution: 192dpi),   screen , (                min-resolution: 2dppx) {     selector1 {       background-image: url(path/to/image1@2x.png);     }     selector2 {       background-image: url(path/to/image2@2x.png);     }   } }

to achieve thought of storing @2x background image urls in list , printing saved rulesets @ end of file within 1 media query. couldn't find way it.

can suggest solution, fine kind of approach.

i using grunt-contrib-less compile less. if compiler optimizes output, please mention it.


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