LunarVim/lua/lv-rust-tools/init.lua

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 = "<-",

            -- prefix for all the other hints (type, chaining)
            -- default: "=>"
            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 = {DATA_PATH .. "/lspinstall/rust/rust-analyzer"},
        on_attach = require'lsp'.common_on_attach
    }, -- rust-analyser options
}


require('rust-tools').setup(opts)

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)