Less mixin for Flexbox (IE 10+)

flexbox.less

// --------------------------------------------------
// Flexbox LESS mixins
// --------------------------------------------------

// Flexbox display
// flex or inline-flex
.flex-display(@display: flex) {
    display: ~"-webkit-@{display}";
    display: ~"-moz-@{display}";
    display: ~"-ms-@{display}box"; // IE10 uses -ms-flexbox
    display: ~"-ms-@{display}"; // IE11
    display: @display;
}

// The 'flex' shorthand
// - applies to: flex items
// <positive-number>, initial, auto, or none
.flex(@columns: initial) {
    -webkit-box-flex: @columns;
    -webkit-flex: @columns;
    -moz-flex: @columns;
    -ms-flex: @columns;
    flex: @columns;
}

// Flex Flow Direction
// - applies to: flex containers
// row | row-reverse | column | column-reverse
.flex-direction(@direction: row) {
    -webkit-flex-direction: @direction;
    -moz-flex-direction: @direction;
    -ms-flex-direction: @direction;
    flex-direction: @direction;
}

// Flex Line Wrapping
// - applies to: flex containers
// nowrap | wrap | wrap-reverse
.flex-wrap(@wrap: nowrap) {
    -webkit-flex-wrap: @wrap;
    -moz-flex-wrap: @wrap;
    -ms-flex-wrap: @wrap;
    flex-wrap: @wrap;
}

// Flex Direction and Wrap
// - applies to: flex containers
// <flex-direction> || <flex-wrap>
.flex-flow(@flow) {
    -webkit-flex-flow: @flow;
    -moz-flex-flow: @flow;
    -ms-flex-flow: @flow;
    flex-flow: @flow;
}

// Display Order
// - applies to: flex items
// <integer>
.flex-order(@order: 0) {
    -webkit-order: @order;
    -moz-order: @order;
    -ms-flex-order: @order;
    order: @order;
}

// Flex grow factor
// - applies to: flex items
// <number>
.flex-grow(@grow: 0) {
    -webkit-flex-grow: @grow;
    -moz-flex-grow: @grow;
    -ms-flex-grow: @grow;
    flex-grow: @grow;
}

// Flex shrink
// - applies to: flex item shrink factor
// <number>
.flex-shrink(@shrink: 1) {
    -webkit-flex-shrink: @shrink;
    -moz-flex-shrink: @shrink;
    -ms-flex-shrink: @shrink;
    flex-shrink: @shrink;
}

// Flex basis
// - the initial main size of the flex item
// - applies to: flex itemsnitial main size of the flex item
// <width>
.flex-basis(@width: auto) {
    -webkit-flex-basis: @width;
    -moz-flex-basis: @width;
    -ms-flex-basis: @width;
    flex-basis: @width;
}

// Axis Alignment
// - applies to: flex containers
// flex-start | flex-end | center | space-between | space-around
.justify-content(@justify: flex-start) {
    .ms-flex-justify(@value) {
        ._(@value);
        ._(space-between) { -ms-flex-pack: justify;    }
        ._(space-around)  { -ms-flex-pack: distribute; }
        ._(flex-end)      { -ms-flex-pack: end;        }
        ._(flex-start)    { -ms-flex-pack: start;      }
        ._(center)        { -ms-flex-pack: center;     }
    }

    -webkit-justify-content: @justify;
    -moz-justify-content: @justify;
    -ms-justify-content: @justify;
    justify-content: @justify;
    .ms-flex-justify(@justify);
}

// Packing Flex Lines
// - applies to: multi-line flex containers
// flex-start | flex-end | center | space-between | space-around | stretch
.align-content(@align: stretch) {
    -webkit-align-content: @align;
    -moz-align-content: @align;
    -ms-align-content: @align;
    align-content: @align;
}

// Cross-axis Alignment
// - applies to: flex containers
// flex-start | flex-end | center | baseline | stretch
.align-items(@align: stretch) {
    .ms-flex-align(@value) {
        ._(@value);
        ._(baseline)    { -ms-flex-align: baseline;}
        ._(stretch)     { -ms-flex-align: stretch; }
        ._(flex-end)    { -ms-flex-align: end;     }
        ._(flex-start)  { -ms-flex-align: start;   }
        ._(center)      { -ms-flex-align: center;  }
    }
    -webkit-align-items: @align;
    -moz-align-items: @align;
    -ms-align-items: @align;
    align-items: @align;
    .ms-flex-align(@align);
}

// Cross-axis Alignment
// - applies to: flex items
// auto | flex-start | flex-end | center | baseline | stretch
.align-self(@align: auto) {
    .ms-flex-align-self(@msSelfAlign) when (@msSelfAlign = flex-end) {
        -ms-flex-item-align: end;
    }

    .ms-flex-align-self(@msSelfAlign) when (@msSelfAlign = flex-start) {
        -ms-flex-item-align: start;
    }

    .ms-flex-align-self(@msSelfAlign) when (@msSelfAlign = auto), (@msSelfAlign = center),(@msSelfAlign = baseline), (@msSelfAlign = stretch) {
        -ms-flex-item-align: @msSelfAlign;
    }

    -webkit-align-self: @align;
    -moz-align-self: @align;
    -ms-align-self: @align;
    align-self: @align;
    .ms-flex-align-self(@align);
}