[Gambas-user] check 4 Gambas Runtime files?

[Jussi Lahtinen]

gbx3 -V
or
gbx3 --version

Works also...


Jussi

On Wed, Dec 13, 2017 at 9:54 AM, Tobias Boege <taboege at gmail.com> wrote:

> On Tue, 12 Dec 2017, mikeB wrote:
> > On my web site, that I offer software programmed using Gambas, I have a
> > notice :
> > ***********************************************************************
> > VERY IMPORTANT: before installing this app you will need to install
> Gambas
> > Runtime  v10 files - most systems will not have these very new files
> > installed yet.
> >
> > Do so via the terminal commands:
> > sudo add-apt-repository ppa:gambas-team/gambas3
> > sudo apt-get update
> > ***********************************************************************
> > Now that Gambas runtime 10 files are more common - being install by the
> > Distro - is there a way for the user (terminal command) to check if they
> are
> > installed?
> >
> > This is a real newbie question I'm sure but hey.. I'm a newbie!
> > Thanks for any all help on this matter and have a GREAT day,
> > mikeB
> >
>
> First check if the interpreter gbx3 is found in PATH, using the "which"
> utility. If not, I wouldn't call Gambas properly installed (although
> some people might disagree -- it's their computer -- but then they will
> be able to figure their Gambas version out themselves).
>
> Once you have that, the System class has FullVersion which gives you the
> Gambas version as a string and you can compare it like this:
>
>   $ gbx3 -e 'Comp(System.FullVersion, "3.10", gb.Natural) >= 0'
>
> Comp will return the sign (-1, 0 or 1) of subtracting the version 3.10
> from your Gambas version. You want the comparison to yield 0 or 1.
> With the above line, you will see either the string "True" or "False"
> printed to the terminal; you can make the output fancier.
>
> NOTE: gb.Natural makes the comparison by natural sort, which is appropriate
> to compare version numbers. Observe:
>
>   $ gbx3 -e 'Comp("3.2", "3.10")'
>   1
>   $ gbx3 -e 'Comp("3.2", "3.10", gb.Natural)'
>   -1
>
> Because "2" comes before "1" in the alphabet, the default lexicographic
> comparison mode declares the string "3.2" to be greater than "3.10",
> but gb.Natural gets it right.
>
> Also never coerce the string version into a float for easier comparison
> because you'll run into nasty bugs caused by float roundoff.
>
> Regards,
> Tobi
>
> --
> "There's an old saying: Don't change anything... ever!" -- Mr. Monk
>
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