Neovim + toggleterm plugin utility snippet for Rust: launching cargo watch automaticaly on current project

toggleterm_custom.lua

local cargo_watch = Terminal:new({
  -- launch cargo watch with all the necessary options to just have the project running:
  cmd = "cargo watch -q -c -x 'run -q'",
  dir = "git_dir",
  -- open the terminal under the file (use "vertical" to open it on the right)
  direction = "horizontal",
  -- automaticaly quit the process when the terminal is closed:
  close_on_exit = true,
  on_open = function(term)
    -- when the terminal is launched the cursor is sent back into the code (use ':wincmd h' if terminal on the right):
    vim.cmd(":wincmd k")
    -- to be able to also quit with 'q' in the terminal (in normal mode)
    vim.api.nvim_buf_set_keymap(term.bufnr, "n", "q", "<cmd>close<CR>", { noremap = true, silent = true })
  end,
})
--[[
function to bind with a keymap or in which-key or whatever, e.g.:
  require("file.where.this.snippet.is")
  vim.api.nvim_set_keymap('n', '<Leader>tw', "<Cmd>lua cargo_watch_toggle()<CR>", {noremap = true})
]]--
function cargo_watch_toggle()
  cargo_watch:toggle()
end

--[[
Keymapping examples
--]]

-- regular kaymapping
require("file.where.the.snippet.is")
vim.api.nvim_set_keymap('n', '<Leader>tw', "<Cmd>lua cargo_watch_toggle()<CR>", {noremap = true})

-- or in Witch-key:
require("file.where.the.snippet.is")
local mappings = {
  -- ...
  t = {
    name = "   Terminal",
    -- ...
	  w = { "<Cmd>lua cargo_watch_toggle()<CR>", " Cargo Watch" },
	},
}
which_key.register(mappings, opts)