spread
macro for spreading blocks into call parameters/collections
import spread
proc foo(a, b, c: int) =
echo "a: ", a
echo "b: ", b
echo "c: ", c
# regular call:
foo.spread:
1
c = 3
b = 2
# operator version:
...foo:
1
c = 3
b = 2
# operator allows inline version with `do`:
let a = 1 (...min do:
2
3)
assert a == 3
# method call syntax:
spread 1.foo:
c = 3
b = 2
spread 1.foo(2):
c = 3
# arrays:
const arr = [].spread:
1
2
3
assert arr == [1, 2, 3]
# table constructors:
let tab = {:}.spread:
"a" = 1 # constructors convert = in a statement to :
_("b": 2, "c": 3) # all arguments of _ are spread directly
assert tab == {"a": 1, "b": 2, "c": 3}
# object or tuple constructors need a single `_: _``:
type Foo = object
a, b, c: int
let obj = spread Foo(_: _):
a = 1
c = 3
b = 2
assert obj == Foo(a: 1, b: 2, c: 3)