fix(vim.fs): dirname() returns "." on mingw/msys2 #30480
Problem:
`vim.fs.dirname([[C:\User\XXX\AppData\Local]])` returns "." on
mingw/msys2.
Solution:
- Check for "mingw" when deciding `iswin`.
- Use `has("win32")` where possible, it works in "fast" contexts since
b02eeb6a72.
Fix the following two issues:
- pyenv root detection issue
When `PYENV_ROOT` environment variable is not set, neovim will detect
pyenv's root via `pyenv root` command, but which will be always fail
because `vim.fn.system()` returns result with additional `\n`. Using
`vim.system` instead prevents this problem. to trim it before check
whether it is exists
- python executable path detection issue
Filter unrelated `python-config` in cases where multiple python versions
are installed, e.g. `python-config`, `python3.10-config`,
`python3.11-config` etc.
(cherry picked from commit b4b4cf46a7)
The benefit of this is that users only pay for what they use. If e.g.
only `vim.lsp.buf_get_clients()` is called then they don't need to load
all modules under `vim.lsp` which could lead to significant startuptime
saving.
Also `vim.lsp.module` is a bit nicer to user compared to
`require("vim.lsp.module")`.
This isn't used for some nested modules such as `filetype` as it breaks
tests with error messages such as "attempt to index field 'detect'".
It's not entirely certain the reason for this, but it is likely it is
due to filetype being precompiled which would imply deferred loading
isn't needed for performance reasons.
Problem:
If `neovim` module is not installed, python and ruby healthchecks fail:
- ERROR Failed to run healthcheck for "provider.python" plugin. Exception:
.../runtime/lua/provider/python/health.lua:348: attempt to concatenate local 'pyname' (a nil value)
- ERROR Failed to run healthcheck for "provider.ruby" plugin. Exception:
.../runtime/lua/provider/ruby/health.lua:25: attempt to index local 'host' (a nil value)
Solution:
Check for non-nil.
