Add support for MOI.SolverVersion

[chriscoey]

@odow do you know how to get the version of the active package, so we can return it as a string?

[odow]

I never liked this though
https://github.com/jump-dev/JuMP.jl/blob/6bde748268c579a635c81ccd8c0afe50d9cce0b5/docs/make.jl#L451-L452

You could also parse the TOML file

[chriscoey]

Hmm there is PkgVersion.jl - see https://github.com/KlausC/PkgVersion.jl/blob/main/src/PkgVersion.jl

[chriscoey]

There is https://discourse.julialang.org/t/how-to-find-out-the-version-of-a-package-from-its-module/37755/16?u=chriscoey but it only works on 1.9+

[chriscoey]

@odow could we use some combination of

using TOML

const PACKAGE_VERSION = let
    project = TOML.parsefile(joinpath(pkgdir(@__MODULE__), "Project.toml"))
    VersionNumber(project["version"])
end

if the julia version < 1.9, and pkgversion(@__MODULE__) for 1.9+? These are taken from that discourse link above.

[odow]

Is it really necessary? This was mainly intended for solvers which have upstream versions that are unrelated their Julia package version.

But presumably something like

@static if VERSION < v"1.9"
    import TOML
    function MOI.get(model::Optimizer, ::MOI.SolverVersion)
        project = TOML.parsefile(joinpath(pkgdir(@__MODULE__), "Project.toml"))
        return VersionNumber(project["version"])
    end
else
    MOI.get(model::Optimizer, ::MOI.SolverVersion) = pkgversion(@__MODULE__)
end

[chriscoey]

If the standard procedure is not to support MOI.SolverVersion in cases like this (pure Julia solvers), then it's OK to close this issue without a fix. I can just use pkgversion as a fallback in my own code if I can't get MOI.SolverVersion.

[chriscoey]

The above worked for my use case so I'll close