Add support for multiple packages in @require statement

[juliohm]

Sometimes a functionality depends on a combination of packages, and it would be nice to have a syntax for that, something like @require PkgA="..." PkgB="..." include("file.jl")

As discussed on slack, a current workaround is to do something like:

pkgA = false
pkgB = false
@require PkgA begin
 global pkgA = true
 pkgA && pkgB && include("file.jl")
end
@require PkgB begin
 global pkgB = true
 pkgA && pkgB && include("file.jl")
end

but that solution is too verbose for more than 2 packages.

[timholy]

Do we really need anything special here?

module TestRequires

using Requires

function __init__()
    @require Images="916415d5-f1e6-5110-898d-aaa5f9f070e0" begin
        @require Revise="295af30f-e4ad-537b-8983-00126c2a3abe" println("Got both!")
    end
end

end # module

Session:

julia> using TestRequires
[ Info: Precompiling TestRequires [eb9e79a2-1324-11e9-3469-91075b92f61d]

julia> using Images

julia> using Revise
[ Info: Recompiling stale cache file /tmp/pkgs/compiled/v1.0/Revise/M1Qoh.ji for Revise [295af30f-e4ad-537b-8983-00126c2a3abe]
Got both!

[juliohm]

Clever! 💯