convert_metadata.jl

# Fileformat #
##############
# url to package
#
# version x  <-
# -------     |
# sha1        |
# req 1       |
# req 2       |
# ...         |
# req n       |
# new line ----

function convert_folder(indir, outdir)
    !isdir(indir) && return
    open(joinpath(outdir, splitdir(indir)[end] * ".versions"), "w") do new_verfile
        print(new_verfile, readchomp(joinpath(indir, "url")), "\n\n")
        versions_path = joinpath(indir, "versions")
        !isdir(versions_path) && return
        first = true
        for ver in readdir(versions_path)
            !first && print(new_verfile, "\n")
            first = false
            ismatch(Base.VERSION_REGEX, ver) || continue
            version_path = joinpath(versions_path, ver)
            print(new_verfile, ver, "\n")
            print(new_verfile, "-"^length(ver), "\n")
            print(new_verfile, readstring(joinpath(version_path, "sha1")))
            req_path = joinpath(version_path, "requires")
            if isfile(req_path)
                for line in readlines(req_path)
                    isempty(chomp(line)) && continue
                    print(new_verfile, line)
                end
            end
        end
    end
end

function convert_all(indir, outdir)
    !isdir(outdir) && error("Invalid dir, does not exist")
    for package in readdir(indir)
        startswith(package, ".") && continue
        convert_folder(joinpath(indir, package), outdir)
    end
end

v = "v0.5"
cd(joinpath(Pkg.dir(), "..", v)) do
    indir = joinpath("METADATA")
    outdir = joinpath("METADATA_compressed")
    !isdir(outdir) && mkdir(outdir)
    convert_all(indir, outdir)
end