nvim/rust.lua

local rt = require("rust-tools")
local nvim_lsp = require 'lspconfig'
local c = vim.lsp.protocol.make_client_capabilities()
local deps = require("nvim-deps")

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

        -- 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,
        cmd = {(deps.rust_analyzer_path .. "/bin/rust-analyzer")},
        capabilities = require("cmp_nvim_lsp").default_capabilities(c),
        on_attach = function(_, bufnr)
            local keymap_opts = {buffer = bufnr}
            -- Hover actions
            vim.keymap.set("n", "<leader>h", rt.hover_actions.hover_actions,
                           keymap_opts)
            -- Code action groups
            vim.keymap.set("n", "<leader>as",
                           rt.code_action_group.code_action_group, keymap_opts)
            vim.keymap.set('n', '<leader>c', rt.open_cargo_toml.open_cargo_toml)
            vim.keymap.set("n", "g0", vim.lsp.buf.document_symbol, keymap_opts)
            local diag_float_grp = vim.api.nvim_create_augroup(
                                       "DiagnosticFloat", {clear = true})
            vim.api.nvim_create_autocmd("CursorHold", {
                callback = function()
                    vim.diagnostic.open_float(nil, {focusable = false})
                end,
                group = diag_float_grp
            })

            -- Goto previous/next diagnostic warning/error
            vim.keymap.set("n", "g[", vim.diagnostic.goto_prev, keymap_opts)
            vim.keymap.set("n", "g]", vim.diagnostic.goto_next, keymap_opts)
        end
    }, -- rust-analyzer options

    -- debugging stuff
    dap = {
        adapter = {
            type = "executable",
            command = deps.lldb_path .. "/bin/lldb-vscode",
            name = "rt_lldb"
        }
    }
})