On 16 Mar, 2013, at 17:00 , steve donovan <steve.j.dono...@gmail.com> wrote:
> On Sat, Mar 16, 2013 at 5:38 PM, Gary V. Vaughan <g...@vaughan.pe> wrote:
>> It would be really cool if Luarocks had some facility for virtual
>> dependencies,
>> so that, for example, both lyaml and luaYAML could satisfy a yaml dependency,
>
> It's indeed a useful concept, and time to think about how the next
> rockspec version can support it.
In LuaDist there is a "provides" table that basically does this. For example
LuaJIT2 provides "lua-5.1.5" so when LuaJIT2 is installed all dependencies
against lua-5.1.5 are satisfied. The concept applies for virtual dependencies
as the provided package may not even exist. LuaDist will even list the
provided packages and display what packages provide the functionality.
Eg.
$ ./luadist _jit list
Installed modules:
==================
lua-5.1.5 (Darwin-x86_64) [provided by luajit-2.0.0-beta10]
luajit-2.0.0-beta10 (Darwin-x86_64)
the dist.info (rockspec equivalent) just contains:
provides = {
"lua-5.1.5",
}
> My understanding is that if you already have lyaml OR luaYAML then LR
> is satisfied. If neither, then pick the first one?
The above solves this problem too. If modules depend on lyaml then it will be
the primary package to install. However if luaYAML would provide lyaml in its
rockspec info then you can install it first and proceed with all dependencies
intact.
pd
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