local Observable = require "rx.observable"

--- Returns a new Observable that completes when the specified Observable fires.
-- @arg {Observable} other - The Observable that triggers completion of the original.
-- @returns {Observable}
function Observable:takeUntil(other)
    return Observable.create(function(observer)
        local subscription
        local function onNext(...)
            return observer:onNext(...)
        end

        local function onError(e)
            return observer:onError(e)
        end

        local function onCompleted()
            if subscription then
                subscription:unsubscribe()
            end
            return observer:onCompleted()
        end

        other:subscribe(onCompleted, onCompleted, onCompleted)

        subscription = self:subscribe(onNext, onError, onCompleted)
        return subscription
    end)
end