bug#55069: Add some means to find LV2 plugins

bug#55069: Add some means to find LV2 plugins

[Nathan Dehnel]

It seems DAWs and plugins can't find each other because there is no
way to find the plugins outside of the store because there is no
directory where the plugins are aggregated, and $LV2_PATH isn't set.

[bug#46210] bug#55069: Add some means to find LV2 plugins

[Maxime Devos]

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> [PATCH] gnu: mda-lv2: Remove unnecessary search-path-specification.

Isn't it currently necessary?  Because lv2 doesn't have a LV2_PATH
search path yet.

Nathan Dehnel schreef op vr 22-04-2022 om 17:13 [-0500]:
> It seems DAWs and plugins can't find each other because there is no
> way to find the plugins outside of the store because there is no
> directory where the plugins are aggregated, and $LV2_PATH isn't set.

I think this would be resolved by adding the search path to the 'lv2'
package (and removing it from lv2-mda-piano, mda-lv2 and calf).

> [PATCH] gnu: Add invada-studio-plugins-lv2.
> [PATCH] gnu: Add distrho-ports-lv2.
> [PATCH] gnu: Add omins-lv2.
> [PATCH] Add drumgizmo

The convention is to add the search paths to the users of the plugins,
not the plugins theirselves.  Cf. GUILE_LOAD_PATH, LIBRARY_PATH,
MINETEST_MOD_PATH, EMACSLOADPATH, INFOPATH ...  See
<https://issues.guix.gnu.org/49533#5>.

The benefit is that this avoids forgetting LV2_PATH for some plugins,
as it only needs to be added to relatively few places (lv2 itself,
maybe guitarix, maybe ir, arour ...).

Greetings,
Maxime

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