Re: module _VERSION number scheme proposal
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- Subject: Re: module _VERSION number scheme proposal
- From: Miles Bader <miles@...>
- Date: 2011年11月09日 13:19:11 +0900
David Manura <dm.lua@math2.org> writes:
> It is a trade-off. The main intention of the zero padding is to allow
> versions to be compared by simple string comparison, i.e. without any
> external version library like verlib [1].
>
> local B = require 'baz'
> local V = require 'verlib'
> if V(B._VERSION) >= V'1.2.5' then
> -- as opposed to just `B._VERSION >= '001.002.005'`
> . . .
> else
> . . .
> end
>
> Implementing verlib in Lua would also be a valid approach though.
> Should we bother? With git, we just accept unfriendly version numbers
> (e.g. 8d1985807b).
I think a simple "version_compare" function (version_greater, whatever)
would be more straight-forward; indeed, something like that already
exists in GNU libc -- strverscmp. The basic idea is: compare
lexigraphically, but compare any embedded integers as numbers.
-Miles
--
Friendship, n. A ship big enough to carry two in fair weather, but only one
in foul.