;;; -*- logo -*-

.macro foreach [:foreach.inputs] 2
catch "foreach.catchtag ~
      [op foreach.done runresult ~
	    [foreach1 bl :foreach.inputs last :foreach.inputs 1]]
op []
end

to foreach1 :template.lists :foreach.template :template.number
if emptyp first :template.lists [throw "foreach.catchtag]
apply :foreach.template firsts :template.lists
.maybeoutput foreach1 bfs :template.lists :foreach.template :template.number+1
end

to foreach.done :foreach.result
if emptyp :foreach.result [op [stop]]
op (list "output "first (list first :foreach.result))
end

to ?rest [:which 1]
output bf item :which :template.lists
end

bury [foreach foreach1 foreach.done ?rest]
