In the two places where our "helpers" lib is exclusively internal
(flake module args and building the docs), we no longer supply `pkgs`.
In the other 4 locations, we now note why we still do in a comment.
The old `default.nix` is inlined into the "lib" flake-module, which is
the only place it was used.
This allows "helpers" to take its rightful place at the root of `./lib` 👑
Introduces the `test.runNvim` module option.
Deprecates the historic `dontRun` argument passed to the test-derivation
helpers.
Soft-deprecates the `tests.dontRun` attr used in tests currently.
In our basic template we used to provide a check based on
`mkTestDerivationFromNvim`. The issue with this check (that is handled
correctly internally) is that some plugins _can't_ be used in the test
environment, for example image.nvim like in #1085.
This commit introduces a new function to generate such checks,
`mkTestDerivationFromNixvimModule`, that wraps a nixvim configuration
instead of a built nvim instance.
Then a configuration can rely on the newly added
`helpers.enableExceptInTests` attribute to disable parts of the
configuration depending if it is evaluated in tests or in a real final
configuration.
Resolves#1085
