LunarVim/ftplugin/rust.lua

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 = "<-",

                -- 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)

else

    require'lspconfig'.rust_analyzer.setup {
        cmd = {DATA_PATH .. "/lspinstall/rust/rust-analyzer"},
        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)

if O.lang.rust.autoformat then
    require('lv-utils').define_augroups({
        _rust_format = {
            {'BufWritePre', '*.rs', 'lua vim.lsp.buf.formatting_sync(nil,1000)'}
        }
    })
end