my-nvim-setup/lua/languages/rust.lua

return {
  { "rust-lang/rust.vim" },
  {
    "simrat39/rust-tools.nvim",
    lazy = true,
    config = function()
      local rt = require "rust-tools"
      rt.setup {
        tools = { -- rust-tools options

          -- how to execute terminal commands
          -- options right now: termopen / quickfix
          executor = require("rust-tools.executors").quickfix,

          -- callback to execute once rust-analyzer is done initializing the workspace
          -- The callback receives one parameter indicating the `health` of the server: "ok" | "warning" | "error"
          on_initialized = nil,

          -- automatically call RustReloadWorkspace when writing to a Cargo.toml file.
          reload_workspace_from_cargo_toml = true,

          -- These apply to the default RustSetInlayHints command
          inlay_hints = {
            -- automatically set inlay hints (type hints)
            -- default: true
            auto = true,

            -- Only show inlay hints for the current line
            only_current_line = false,

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

            -- prefix for parameter hints
            -- default: "<-"
            parameter_hints_prefix = "<- ",

            -- prefix for all the other hints (type, chaining)
            -- default: "=>"
            other_hints_prefix = "=> ",

            -- whether to align to the length 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,

            -- The color of the hints
            highlight = "Comment",
          },

          -- options same as lsp hover / vim.lsp.util.open_floating_preview()
          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" },
            },

            -- Maximal width of the hover window. Nil means no max.
            max_width = nil,

            -- Maximal height of the hover window. Nil means no max.
            max_height = nil,

            -- whether the hover action window gets automatically focused
            -- default: false
            auto_focus = false,
          },

          -- settings for showing the crate graph based on graphviz and the dot
          -- command
          crate_graph = {
            -- Backend used for displaying the graph
            -- see: https://graphviz.org/docs/outputs/
            -- default: x11
            backend = "x11",
            -- where to store the output, nil for no output stored (relative
            -- path from pwd)
            -- default: nil
            output = nil,
            -- true for all crates.io and external crates, false only the local
            -- crates
            -- default: true
            full = true,

            -- List of backends found on: https://graphviz.org/docs/outputs/
            -- Is used for input validation and autocompletion
            -- Last updated: 2021-08-26
            enabled_graphviz_backends = {
              "bmp",
              "cgimage",
              "canon",
              "dot",
              "gv",
              "xdot",
              "xdot1.2",
              "xdot1.4",
              "eps",
              "exr",
              "fig",
              "gd",
              "gd2",
              "gif",
              "gtk",
              "ico",
              "cmap",
              "ismap",
              "imap",
              "cmapx",
              "imap_np",
              "cmapx_np",
              "jpg",
              "jpeg",
              "jpe",
              "jp2",
              "json",
              "json0",
              "dot_json",
              "xdot_json",
              "pdf",
              "pic",
              "pct",
              "pict",
              "plain",
              "plain-ext",
              "png",
              "pov",
              "ps",
              "ps2",
              "psd",
              "sgi",
              "svg",
              "svgz",
              "tga",
              "tiff",
              "tif",
              "tk",
              "vml",
              "vmlz",
              "wbmp",
              "webp",
              "xlib",
              "x11",
            },
          },
        },

        -- 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/doc/server_configurations.md#rust_analyzer
        server = {
          -- standalone file support
          -- setting it to false may improve startup time
          standalone = true,
        }, -- rust-analyzer options

        -- debugging stuff
        dap = {
          adapter = {
            type = "executable",
            command = "lldb-vscode",
            name = "rt_lldb",
          },
        },
      }
    end,
  },
}