LunarVim/lua/lang/rust.lua

local M = {}

M.config = function()
  O.lang.rust = {
    rust_tools = {
      active = false,
      parameter_hints_prefix = "<-",
      other_hints_prefix = "=>", -- prefix for all the other hints (type, chaining)
    },
    -- @usage can be clippy
    formatter = {
      exe = "rustfmt",
      args = { "--emit=stdout", "--edition=2018" },
      stdin = true,
    },
    linter = "",
    diagnostics = {
      virtual_text = { spacing = 0, prefix = "" },
      signs = true,
      underline = true,
    },
    lsp = {
      path = DATA_PATH .. "/lspinstall/rust/rust-analyzer",
    },
  }
end

M.format = function()
  O.formatters.filetype["rust"] = {
    function()
      return {
        exe = O.lang.rust.formatter.exe,
        args = O.lang.rust.formatter.args,
        stdin = O.lang.rust.formatter.stdin,
      }
    end,
  }

  require("formatter.config").set_defaults {
    logging = false,
    filetype = O.formatters.filetype,
  }
end

M.lint = function()
  -- TODO: implement linters (if applicable)
  return "No linters configured!"
end

M.lsp = function()
  if require("lv-utils").check_lsp_client_active "rust_analyzer" then
    return
  end

  if O.lang.rust.rust_tools.active then
    local opts = {
      tools = { -- rust-tools options
        -- automatically set inlay hints (type hints)
        -- There is an issue due to which the hints are not applied on the first
        -- opened file. For now, write to the file to trigger a reapplication of
        -- the hints or just run :RustSetInlayHints.
        -- default: true
        autoSetHints = true,

        -- whether to show hover actions inside the hover window
        -- this overrides the default hover handler
        -- default: true
        hover_with_actions = true,

        runnables = {
          -- whether to use telescope for selection menu or not
          -- default: true
          use_telescope = true,

          -- rest of the opts are forwarded to telescope
        },

        inlay_hints = {
          -- wheter to show parameter hints with the inlay hints or not
          -- default: true
          show_parameter_hints = true,

          -- prefix for parameter hints
          -- default: "<-"
          parameter_hints_prefix = O.lang.rust.rust_tools.parameter_hints_prefix,

          -- prefix for all the other hints (type, chaining)
          -- default: "=>"
          other_hints_prefix = O.lang.rust.rust_tools.other_hints_prefix,

          -- whether to align to the lenght of the longest line in the file
          max_len_align = false,

          -- padding from the left if max_len_align is true
          max_len_align_padding = 1,

          -- whether to align to the extreme right or not
          right_align = false,

          -- padding from the right if right_align is true
          right_align_padding = 7,
        },

        hover_actions = {
          -- the border that is used for the hover window
          -- see vim.api.nvim_open_win()
          border = {
            { "╭", "FloatBorder" },
            { "─", "FloatBorder" },
            { "╮", "FloatBorder" },
            { "│", "FloatBorder" },
            { "╯", "FloatBorder" },
            { "─", "FloatBorder" },
            { "╰", "FloatBorder" },
            { "│", "FloatBorder" },
          },
        },
      },

      -- all the opts to send to nvim-lspconfig
      -- these override the defaults set by rust-tools.nvim
      -- see https://github.com/neovim/nvim-lspconfig/blob/master/CONFIG.md#rust_analyzer
      server = {
        cmd = { O.lang.rust.lsp.path },
        on_attach = require("lsp").common_on_attach,
      }, -- rust-analyser options
    }
    require("rust-tools").setup(opts)
  else
    require("lspconfig").rust_analyzer.setup {
      cmd = { O.lang.rust.lsp.path },
      on_attach = require("lsp").common_on_attach,
      filetypes = { "rust" },
      root_dir = require("lspconfig.util").root_pattern("Cargo.toml", "rust-project.json"),
    }
  end

  -- TODO: fix these mappings
  vim.api.nvim_exec(
    [[
    autocmd Filetype rust nnoremap <leader>lm <Cmd>RustExpandMacro<CR>
    autocmd Filetype rust nnoremap <leader>lH <Cmd>RustToggleInlayHints<CR>
    autocmd Filetype rust nnoremap <leader>le <Cmd>RustRunnables<CR>
    autocmd Filetype rust nnoremap <leader>lh <Cmd>RustHoverActions<CR>
    ]],
    true
  )
end

M.dap = function()
  -- TODO: implement dap
  return "No DAP configured!"
end

return M