straight.el & `package-installed-p`
reddit / emacs

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reliktary · 2022-10-25 11:36

hi everyone,

I recently switched to straight.el mostly for packages contributing
purposes and it works really great.

In my init.el I sometimes use `package-installed-p` function to check
if package is installed but straight.el doesn't install packages
"emacs way" so that function always return nil. I expect there should
be similar function in straight.el but I can't find one.

Do you know if it's exists?

Thanks

EDIT:
There is `straight--installed-p` but it expects a `RECIPE` and I don't
really understand what is this. Definitely not a package name

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MitchellMarquez42 · 2022-10-25 12:51

You might be able to use `featurep` instead (it checks for things you
can 'require)

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nv-elisp · 2022-10-25 13:30

Can you provide an example of how you are using `package-installed-p`
in your init?

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vifon · 2022-10-25 15:38

I'm pretty sure `featurep` checks whether a feature is already
required.

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reliktary · 2022-10-26 00:22

As an example, I use it to define `elfeed-feeds` variable in case
`elfeed` package exists. I don't want to keep that list loaded in the
memory.

And thanks a lot for this question, because it made me think at least
a little bit and recall that it's emacs where I can do anything.

I currently store `elfeed-feeds` definition in a separate file since
it's a big list. `use-package` call for `elfeed` is in separate file
and I don't want to store that big list of feeds in there.
So I changed my config files a bit so `(use-package elfeed...)`
defines `elfeed-feeds` in it's `:config` section and it takes that
list from that elfeed specific .el file.
So now, if I don't need elfeed, that big file isn't gonna be loaded
too.

Thanks a lot!

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walseb · 2022-10-29 21:08

I just use `fboundp` on a function in the package. You could use it on
a autoloaded function or just any function if the package is fully
loaded. There is also `boundp`.