Move HTTP and XRootD related stuff into extensions

[tamasgal]

The only part which I am stuck at right now is in src/root.jl:

function ROOTFile(filename::AbstractString; customstructs = Dict("TLorentzVector" => LorentzVector{Float64}))
    fobj = if startswith(filename, r"https?://")
        HTTPStream(filename)
    elseif startswith(filename, "root://")
        XRDStream(filename)
    else
        !isfile(filename) && throw(SystemError("opening file $filename", 2))
        MmapStream(filename)
    end

since both HTTPStream and XRDStream are defined in extensions, which causes a problem of course.

The question is then: how to deal with a type-matching based on string value with potentially undefined types.

For now I went with a symbol-based dynamic approach (which fails, but I will have a look asap):

    fobj = if startswith(filename, r"https?://")
        typesymbol = :HTTPStream
        !isdefined(UnROOT, typesymbol) && error("Opening HTTP streamed ROOT files requires to install and load the 'HTTP' module.")
        getproperty(UnROOT, typesymbol)(filename)
    elseif startswith(filename, "root://")
        typesymbol = :XRDStream
        !isdefined(UnROOT, typesymbol) && error("Opening XRootD streamed ROOT files requires to install and load the 'XRootD' module.")
        getproperty(UnROOT, typesymbol)(filename)
    else
        !isfile(filename) && throw(SystemError("opening file $filename", 2))
        MmapStream(filename)
    end

[Moelf]

I think you can define an empty

function HTTPStream end

in the base package, and extend it in the extension package https://github.com/JuliaHEP/Minuit2.jl/blob/9b2eea06693853fb720118a64d8de16b13dd80a0/ext/Minuit2PlotsExt.jl#L15

[codecov]

Codecov Report

❌ Patch coverage is 64.04494% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.32%. Comparing base (c05d324) to head (6a0c0e4).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/UnROOTXRootDExt.jl	46.66%	16 Missing ⚠️
ext/UnROOTHTTPExt.jl	80.43%	9 Missing ⚠️
src/streamsource.jl	36.36%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #396      +/-   ##
==========================================
- Coverage   84.41%   84.32%   -0.09%     
==========================================
  Files          21       23       +2     
  Lines        3099     3107       +8     
==========================================
+ Hits         2616     2620       +4     
- Misses        483      487       +4     

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[tamasgal]

I yeah, that's probably the easiest

[tamasgal]

Hmm, that will not work:

ERROR: LoadError: cannot assign a value to imported variable UnROOTHTTPExt.HTTPStream

[tamasgal]

Ah OK, I know what to do. I will convert that to actual function calls...

[tamasgal]

OK, this will work. Ready @Moelf

We could then do 0.11 because it's breaking.

[tamasgal]

I will also add a README entry for the breaking change ;)