[Gretl-devel] Re: Accessing a package's version
Am 30.07.19 um 09:36 schrieb Riccardo (Jack) Lucchetti:
On Tue, 30 Jul 2019, Artur Tarassow wrote:
> Hi all,
>
> Since gretl supports the idea of package dependencies now, I think
> it's useful to add an accessor to a package's version for checking
> that the required version is actually installed on the system.
>
> In python one has those magic methods of which one is
> PACKAGE.__version__. Do we have such an accessor available in gretl?
> Given that it exists in the spec-file it should be possible to grab
> it, or not?
If you know where your package file is located, you could use our
xmlget() function, as in
<hansl>
pkgdata = readfile("(a)dotdir/functions/latextab.gfn")
eval xmlget(pkgdata, "/gretl-functions/gretl-function-package/version")
</hansl>
I was thinking about the same, but this won't work if the package is
located somewhere else.
That said, we could have a "version" qualifier to the
"pkg" command, and
possibly store the output under some $-accessor ($result, maybe?).
You mean something like(?):
<hansl>
pkg version armax
eval $pkg_version
</hansl>
"$result" sounds much more general, returning the details of the author
etc. Maybe one could name it "$pkg_version" as "$version" is already
used for accessing the installed gretl version.
Artur