Error when using extra parameters with plugins.

[lhandf]

Describe the bug
I was cleaning up and adding some plugins around the time of the latest commit. I have paq configured to manage itself, so a :PaqSync probably updated it. I get this when running PaqSync now:

E5108: Error executing lua ...cal/share/nvim/site/pack/paqs/start/paq-nvim/lua/paq.lua:98: Cannot serialise function: type not supported
stack traceback:
        [C]: in function 'error'
        ...cal/share/nvim/site/pack/paqs/start/paq-nvim/lua/paq.lua:98: in function 'state_write'
        ...cal/share/nvim/site/pack/paqs/start/paq-nvim/lua/paq.lua:297: in function 'exe_op'
        ...cal/share/nvim/site/pack/paqs/start/paq-nvim/lua/paq.lua:353: in function 'clean'
        ...cal/share/nvim/site/pack/paqs/start/paq-nvim/lua/paq.lua:354: in function 'sync'
        [string ":lua"]:1: in main chunk

I removed the last plugin I added before the error, thinking it might be the cause, but the error remained. After some commenting, I've narrowed it down to this line in my config:

require "paq" {
    ...
    { "nvim-treesitter/nvim-treesitter", run = function () vim.cmd[[TSUpdate]] end },
    ...

There's no errors if I simply have "nvim-treesitter/nvim-treesitter", instead.

To Reproduce
Use the following with nvim -u:

require "paq" {
    "savq/paq-nvim",
    { "kvrohit/rasmus.nvim", run = function () print("hello") end },
}

Expected behavior
No errors.

Environment:

• Arch Linux
• nvim --version:

NVIM v0.9.0-dev-18-ga93ff5fc6
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/gcc-10 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNVIM_TS_HAS_SET_MATCH_LIMIT -DNVIM_TS_HAS_SET_ALLOCATOR -O2 -g -Og -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wdouble-promotion -Wmissing-noreturn -Wmissing-format-attribute -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/home/runner/work/neovim/neovim/build/cmake.config -I/home/runner/work/neovim/neovim/src -I/home/runner/work/neovim/neovim/.deps/usr/include -I/usr/include -I/home/runner/work/neovim/neovim/build/src/nvim/auto -I/home/runner/work/neovim/neovim/build/include
Compiled by runner@fv-az96-559

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/share/nvim"

Run :checkhealth for more info```

[saccarosium]

I've added a very primitive lockfile mechanism (#147) and was merge like 2 hours ago. The main issue is that vim.json.encode doesn't support decoding functions into json.

As a quickfix I will suggest you to pass to the run function directly the vim command you want to execute, like so:

{ "nvim-treesitter/nvim-treesitter", run = ":TSUpdate" },

As for the long run in future commits I will try to address this issue.

[lhandf]

That works for me, using run = "TSUpdate". I appreciate it.