shiftview.c


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// shiftview all tags regardless of tags having open windows
void
shiftview(const Arg *arg)
{
	Arg view_argument;
	uint32_t destination_tag;

	// arg->i represents the direction and distance passed from config.def.h (usually -1 and +1)
	if(arg->i > 0){
		// shift right (increase tag index), move the active tag bit to the left (0001) to (0010)
		destination_tag = selmon->tagset[selmon->seltags] << arg->i;
	}else{
		// shift to the left
		destination_tag = selmon->tagset[selmon->seltags] >> (-arg->i);
	}

	// TAGMASK defines the valid boundary for tags (111111111) for 9 tags
	// if the shift pushed the active bit outside the bounds, destination_tag will become 0
	if(!(destination_tag & TAGMASK)){
		// If we went off to the right edge, wrap around to the first tag (000000001)
		// If we went off to the left, wrap around to the last tag (bit 1 shifted left by TAGCOUNT - 1)
		destination_tag = arg->i > 0 ? 1 : 1 << (TAGCOUNT - 1);
	}

	// pack the destination tag bitmask into the required dwl argument struct
	view_argument.ui = destination_tag;
	
	// pass the destination tag to dwl's view function
	view(&view_argument);
}