is_calleable assertion

[devurandom]

It would be useful to have an is_calleable assertion that tests whether is_function(argument) or is_function(debug.getmetatable(argument)._call).

[Tieske]

this should be easy to add, see http://stevedonovan.github.io/Penlight/api/libraries/pl.types.html#is_callable

care to create a PR @devurandom ?

[devurandom]

You mean to copy the code from Penlight?

--- is the object either a function or a callable object?.
-- @param obj Object to check.
function types.is_callable (obj)
    return type(obj) == 'function' or getmetatable(obj) and getmetatable(obj).__call and true
end

Sure, I can do that.

[Tieske]

No, busted already relies on Penlight, so all you have to do is add an assertion that uses that function.

[devurandom]

But the assertions reside in luassert/src/assertions.lua, i.e. in luassert, which currently does not depend on Penlight.

[Tieske]

@devurandom you are totally right, sorry for the noise.

[DorianGray]

Feel free to make a PR and reference this issue

[Tieske]

luassert has its own implementation btw; in luassert.util, see https://github.com/Olivine-Labs/luassert/blob/master/src/util.lua#L274