Hi. I’m learning Julia for the first time. I’'m looking for a way to say in my program “If you don’t already have this package, then get it, but if you do, then just use it”. The issue is that if I just put Pkg.add(“DataStructures”), then it seems to re-load that package from the git repo on ever…

Even with Projects, for distributing programs it would be nice if there was a way of checking whether the project has been instantiated yet (I’m actually thinking about the eglot-julia package I’ve been semi-working on). Do you know of a good way of doing this? Just running Pkg.instantiate() every …

I am not aware of a recommended way (a lot of nuts and bolts for distributing Julia programs are WIP), but I would either just make it part of an install script, check for the depot being populated (since I would presumably have the program in its own depot). check for the existence of a fi…

Could you elaborate on how and why you use depots other than the default? The only reason I can come up with is as a hack to avoid precompiling when switching environments. I haven’t used anything but the default depots yet and hadn’t planned on doing so for the eglot-julia integration package.

[image] non-Jedi: Could you elaborate on how and why you use depots other than the default? How: Setting the JULIA_DEPOT_PATH environment variable is a convenient way for me (Linux). There might be others Why: When I do it, it’s usually to test whether something (a global thing, like a wor…

[image] ffevotte: Not sure if it’s useful / clean, but I have this function in some scripts that I use to setup new environments: This is more or less what I ended up doing. [image] Using LanguageServer.jl with eglot in emacs Tooling LanguageServer.jl eglot integra…

[image] non-Jedi: This is more or less what I ended up doing. Yes, I just saw that. Sorry for the noise :pensive:

If I understand your question correctly, Pkg.add("DataStructures") already does what you request automatically. The packages used by any of your projects are shared in the depots (e.g the “~/.julia” folder) so no unnecessary duplication occurs. If someone runs Pkg.add("DataStructures") and the pack…

[image] 00vareladavid: The packages used by any of your projects are shared in the depots (e.g the “~/.julia” folder) so no unnecessary duplication occurs. If someone runs Pkg.add("DataStructures") and the package version already exists in your filesystem, Pkg will just use the existing package …

[image] ffevotte: the registry is updated if a new version of the package is available, this new version is downloaded and installed manifest / project files are updated Since the second bullet is wrong, the last bullet is also wrong. What we could change is perhaps to move the updating of r…

[image] fredrikekre: Since the second bullet is wrong, Ah, sorry, I didn’t know. Why is it needed for Pkg to update the registries, if not in order to find whether a new version of the package is available? [image] fredrikekre: the last bullet is also wrong I might not have been clear…

How to add a package but only if it is not already there?

General Usage

non-Jedi November 8, 2019, 1:21am 21

So I include a snippet over in this other thread I linked above that does exactly what you’re asking for. I agree with many of the poster’s above me that it might not be a good idea, though. Use at your own risk.

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How to add a package but only if it is not already there?

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