available.jl

# Assume that we currently read a version string
function read_version(f::IO)
    version = chomp(readline(f))
    @assert ismatch(Base.VERSION_REGEX, version)
    readline(f) # skip underlined version
    sha = chomp(readline(f))
    requires = String[]
    while !eof(f)
        line = chomp(readline(f))
        isempty(line) && break
        push!(requires, line)
    end
    return version, sha, requires
end

using Base.Pkg.Types
import Base.Pkg.Reqs

function available(path = "METADATA_compressed")
    pkgs = Dict{String,Dict{VersionNumber,Available}}()
    for pkg in readdir(path)
        !endswith(pkg, ".versions") && continue
        pkg_name = split(pkg, ".version")[1]
        f = open(joinpath(path, pkg), "r")
        url = chomp(readline(f))
        readline(f)
        while !eof(f)
            ver, sha, requires = read_version(f)
            haskey(pkgs, pkg_name) || (pkgs[pkg_name] = Dict{VersionNumber,Available}())
            pkgs[pkg_name][convert(VersionNumber, ver)] = Available(sha, Reqs.parse(requires))
        end
    end
    return pkgs
end

v = "v0.5"

cd(joinpath(Pkg.dir(), "..", v)) do
    @time available()
end;