Passing a PkgId to @require

[frankier]

It would be neat if it were possible to pass a PkgId to a version of require so that I could have dependency groups which can be installed a a group and also guarded on as a group. An example of what I would like is here with install_extra and require_extra.

function install_extra(extra)
    pkgs = []
    if extra == "all"
        for (_, specs) in extras
            append!(pkgs, specs)
        end
    else
        append!(pkgs, extras[extra])
    end
    Pkg.add(pkgs)
end

function require_extra(cb, extra)
    function helper(tail)
        if length(tail) > 0
            pkg = tail[1]
            pkgid = Base.PkgId(pkg.uuid, pkg.name)
            @require_pkgid pkgid begin
                helper(tail[2:end])
            end
        else
            cb()
        end
    end
    helper(extras[extra])
end

function __init__()
    require_extra("plots") do
        include("Plots.jl")
    end
end

function pkg(name, uuid)
    PackageSpec(name, Base.UUID(uuid))
end

const extras = Dict(
    "plots" => [
        pkg("Makie", "ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a"),
        pkg("CairoMakie", "13f3f980-e62b-5c42-98c6-ff1f3baf88f0"),
        pkg("GLMakie", "e9467ef8-e4e7-5192-8a1a-b1aee30e663a"),
        pkg("WGLMakie", "276b4fcb-3e11-5398-bf8b-a0c2d153d008"),
        pkg("DataFrames", "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"),
        pkg("AlgebraOfGraphics", "cbdf2221-f076-402e-a563-3d30da359d67")
    ]
)

Unfortunately my macro-fu is not sufficient to be able to write @require_pkgid but I am noting it here.