[Gretl-devel] Re: Accessing a package's version

On Tue, 30 Jul 2019, Artur Tarassow wrote: > 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(&quot;(a)dotdir/functions/latextab.gfn&quot;) >> 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. true >> 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. or perhaps <hansl> pkg info armax bundle b = $result </hansl>