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David Lukes bf85cc0909 checkhealth: better $VIRTUAL_ENV validation #11781
fix #11753
close #11781

The virtualenv troubleshooting in the Python provider health checks is
supposed to help the user determine whether running Python from Neovim
(as in `system('python')` or `system(exepath('python'))`) will use the
correct executable when a virtualenv is active. Currently however, it
issues spurious warnings in legitimate setups, and conversely, fails to
warn about potentially problematic ones.

See https://github.com/neovim/neovim/issues/11753#issuecomment-578715584
for a more detailed analysis, but at a high level, this is due to two
things:

- the virtualenv check is part of the Python provider check defined in
`s:check_python`, which uses a roundabout and sometimes erroneous way of
determining the Python executable
- more generally, it shouldn't be part of the provider check at all,
because it's not really related to the Python *provider*, i.e. the
Python executable which can communicate with Neovim via `pynvim`, but to
the Python the user is editing source files for, which typically
shouldn't even have `pynvim` installed

This patch reimplements the virtualenv check and factors it out into its
own separate function, which is however still kept in
`health/provider.vim` alongside the rest of the Python troubleshooting,
since troubleshooting all Python-related stuff in one place is probably
a good idea in order to alleviate any potential confusion (e.g. users
who run only provider checks might be left wondering whether their
virtualenv Python was properly detected if the report only shows their
global Python as the provider used by Neovim).
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Neovim

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Packages Debian CI Downloads nvim

Neovim is a project that seeks to aggressively refactor Vim in order to:

See the Introduction wiki page and Roadmap for more information.

Features

See :help nvim-features for the full list!

Install from package

Pre-built packages for Windows, macOS, and Linux are found on the Releases page.

Managed packages are in Homebrew, Debian, Ubuntu, Fedora, Arch Linux, Gentoo, and more!

Install from source

The build is CMake-based, but a Makefile is provided as a convenience.

make CMAKE_BUILD_TYPE=RelWithDebInfo
sudo make install

To install to a non-default location:

make CMAKE_INSTALL_PREFIX=/full/path/
make install

To skip bundled (third-party/*) dependencies:

  1. Install the dependencies using a package manager.
    sudo apt install gperf luajit luarocks libuv1-dev libluajit-5.1-dev libunibilium-dev libmsgpack-dev libtermkey-dev libvterm-dev libutf8proc-dev
    sudo luarocks build mpack
    sudo luarocks build lpeg
    sudo luarocks build inspect
    
  2. Build with USE_BUNDLED=OFF:
    make CMAKE_BUILD_TYPE=RelWithDebInfo USE_BUNDLED=OFF
    sudo make install
    

To inspect the build, these CMake features are useful:

  • cmake --build build --target help lists all build targets.
  • build/CMakeCache.txt (or cmake -LAH build/) contains the resolved values of all CMake variables.
  • build/compile_commands.json shows the full compiler invocations for each translation unit.

See the Building Neovim wiki page for details.

Transitioning from Vim

See :help nvim-from-vim for instructions.

Project layout

├─ ci/              build automation
├─ cmake/           build scripts
├─ runtime/         user plugins/docs
├─ src/nvim/        application source code (see src/nvim/README.md)
│  ├─ api/          API subsystem
│  ├─ eval/         VimL subsystem
│  ├─ event/        event-loop subsystem
│  ├─ generators/   code generation (pre-compilation)
│  ├─ lib/          generic data structures
│  ├─ lua/          Lua subsystem
│  ├─ msgpack_rpc/  RPC subsystem
│  ├─ os/           low-level platform code
│  └─ tui/          built-in UI
├─ third-party/     CMake subproject to build dependencies
└─ test/            tests (see test/README.md)

License

Neovim contributions since b17d96 are licensed under the Apache 2.0 license, except for contributions copied from Vim (identified by the vim-patch token). See LICENSE for details.

Vim is Charityware.  You can use and copy it as much as you like, but you are
encouraged to make a donation for needy children in Uganda.  Please see the
kcc section of the vim docs or visit the ICCF web site, available at these URLs:

        http://iccf-holland.org/
        http://www.vim.org/iccf/
        http://www.iccf.nl/

You can also sponsor the development of Vim.  Vim sponsors can vote for
features.  The money goes to Uganda anyway.
Description
Vim-fork focused on extensibility and usability
Readme 450 MiB
Languages
Vim Script 40.8%
Lua 30.8%
C 27.5%
CMake 0.4%
Zig 0.2%
Other 0.1%