I solve problems in LeetCode everyday, so I tried to set up LeetCode and Rust to write with vim.

Submit LeetCode through terminal

1. Install leetcode-cli through npm.

npm install -g leetcode-cli 

2. Update config.json

The config file was created in ~/.lc/config.json.
Update lang to set default language used in coding.

{
  "code": {
    "lang": "rust"
  }
}

3. Create directory and download problem

show command is used to generate source file in .leetcode

mkdir ~/.leetcode
cd ~/.leetcode
leetcode show -g ${question by name or id}

4. Run test command to confirm your code

After writing code, you should run test command before submit.

leetcode test ${file name}

Run submit command

Once the tests pass, submit your code to LeetCode.

You could solve problem in LeetCode with only terminal!

Setup Rust in vim

1. Add mason.nvim and mason-lspconfig.nvim

mason is a package manager specializing in language-related functions, for example lsp.

2. Set mason config

Set the server configured in lspconfig to be installed automatically

~/nvim/after/plugin/mason.

local status, mason = pcall(require, "mason")
if (not status) then return end
local status2, lspconfig = pcall(require, "mason-lspconfig")
if (not status2) then return end

mason.setup({})

lspconfig.setup {
  automatic_installation = true
}

3. Set lspconfig

Add rust-analyzer in lspconfig.

local status, nvim_lsp = pcall(require, "lspconfig")
if (not status) then return end

-- Rust
nvim_lsp.rust_analyzer.setup{
  filetypes = { "rust" }
}

After this setting, you can

4. Add rust-tools

local status, rust_tools = pcall(require, "rust-tools")
if (not status) then return end

rust_tools.setup({
  tools = {
    autoSetHints = true,
  },
  server = {},
})
vim.g.rustfmt_autosave = 1

autoSetHints is very useful.
it shows variable type.

I add vim.g.rustfmt_autosave = 1 to format automatically when I save files.

Summarize

Finally, I can comfortably write Rust in vim and submit code to LeetCode through terminal.