vim-settings/neovim/lua/plugins/lsp.lua

-- luacheck: globals packer_plugins
local M = {}
local utils = require("utils")

function M.config_lsp_ui()
    -- Add floating window boarders
    vim.cmd([[autocmd ColorScheme * highlight NormalFloat guibg=#1f2335]])
    vim.cmd([[autocmd ColorScheme * highlight FloatBorder guifg=white guibg=#1f2335]])
    local border = {
        { "┌", "FloatBorder" },
        { "─", "FloatBorder" },
        { "┐", "FloatBorder" },
        { "│", "FloatBorder" },
        { "┘", "FloatBorder" },
        { "─", "FloatBorder" },
        { "└", "FloatBorder" },
        { "│", "FloatBorder" },
    }
    local orig_util_open_floating_preview = vim.lsp.util.open_floating_preview
    function vim.lsp.util.open_floating_preview(contents, syntax, opts, ...)
        opts = opts or {}
        opts.border = opts.border or border
        return orig_util_open_floating_preview(contents, syntax, opts, ...)
    end

    -- Diagnostics signs
    local signs = {
        Error = "🔥",
        Warn = "⚠️",
        Hint = "🤔",
        Info = "➞",
    }
    for type, icon in pairs(signs) do
        local hl = "DiagnosticSign" .. type
        vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = hl })
    end

    utils.try_require("trouble", function(trouble)
        trouble.setup({
            fold_open = "▼",
            fold_closed = "▶",
            icons = false,
            use_diagnostic_signs = true,
        })
    end)
end

local function default_attach(client, bufnr)
    local function buf_set_keymap(...)
        vim.api.nvim_buf_set_keymap(bufnr, ...)
    end
    local function buf_set_option(...)
        vim.api.nvim_buf_set_option(bufnr, ...)
    end

    buf_set_option("omnifunc", "v:lua.vim.lsp.omnifunc")

    -- Mappings
    -- TODO: Maybe prefix all of these for easier discovery
    local opts = { noremap = true, silent = true }
    buf_set_keymap("n", "gD", "<Cmd>lua vim.lsp.buf.declaration()<CR>", opts)
    buf_set_keymap("n", "gd", "<Cmd>lua vim.lsp.buf.definition()<CR>", opts)
    buf_set_keymap("n", "K", "<Cmd>lua vim.lsp.buf.hover()<CR>", opts)
    buf_set_keymap("n", "gi", "<cmd>lua vim.lsp.buf.implementation()<CR>", opts)
    buf_set_keymap("n", "<C-k>", "<cmd>lua vim.lsp.buf.signature_help()<CR>", opts)
    buf_set_keymap("n", "<leader>wa", "<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>", opts)
    buf_set_keymap("n", "<leader>wr", "<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>", opts)
    buf_set_keymap("n", "<leader>wl", "<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>", opts)
    buf_set_keymap("n", "<leader>D", "<cmd>lua vim.lsp.buf.type_definition()<CR>", opts)
    buf_set_keymap("n", "<leader>rn", "<cmd>lua vim.lsp.buf.rename()<CR>", opts)
    buf_set_keymap("n", "gr", "<cmd>lua vim.lsp.buf.references()<CR>", opts)
    buf_set_keymap("n", "<leader>e", "<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>", opts)
    buf_set_keymap("n", "[d", "<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>", opts)
    buf_set_keymap("n", "]d", "<cmd>lua vim.lsp.diagnostic.goto_next()<CR>", opts)
    buf_set_keymap("n", "<leader>q", "<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>", opts)

    -- Open diagnostic on hold
    if vim["diagnostic"] ~= nil then
        vim.cmd([[autocmd CursorHold,CursorHoldI * lua vim.diagnostic.open_float(nil, {focus=false})]])
    end

    -- Set some keybinds conditional on server capabilities
    if client.resolved_capabilities.document_formatting then
        buf_set_keymap("n", "<leader>lf", "<cmd>lua vim.lsp.buf.formatting()<CR>", opts)
        vim.cmd([[
            augroup lsp_format
                autocmd!
                autocmd BufWritePre *.rs,*.go,*.sh lua vim.lsp.buf.formatting_sync(nil, 1000)
                " autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting_sync(nil, 1000)
            augroup END
        ]])
    end
    if client.resolved_capabilities.document_range_formatting then
        buf_set_keymap("n", "<leader>lfr", "<cmd>lua vim.lsp.buf.range_formatting()<CR>", opts)
    end

    -- Set autocommands conditional on server_capabilities
    if client.resolved_capabilities.document_highlight then
        vim.cmd([[
        :hi LspReferenceRead cterm=bold ctermbg=red guibg=LightYellow
        :hi LspReferenceText cterm=bold ctermbg=red guibg=LightYellow
        :hi LspReferenceWrite cterm=bold ctermbg=red guibg=LightYellow
        augroup lsp_document_highlight
        autocmd!
            autocmd CursorHold <buffer> lua vim.lsp.buf.document_highlight()
            autocmd CursorMoved <buffer> lua vim.lsp.buf.clear_references()
        augroup END
        ]])
    end

    -- Some override some fuzzy finder bindings to use lsp sources
    if utils.try_require("telescope.nvim") ~= nil then
        buf_set_keymap("n", "<leader>t", "<cmd>Telescope lsp_document_symbols<CR>", opts)
        buf_set_keymap("n", "<leader>ft", "<cmd>Telescope lsp_dynamic_workspace_symbols<CR>", opts)
    end

    -- Use LspSaga features, if possible
    if utils.is_plugin_loaded("lspsaga.nvim") then
        buf_set_keymap("n", "K", "<Cmd>lua require('lspsaga.hover').render_hover_doc()<CR>", opts)
        buf_set_keymap("n", "<leader>rn", "<cmd>lua require('lspsaga.rename').rename()<CR>", opts)
        buf_set_keymap("n", "<leader>e", "<cmd>lua require('lspsaga.diagnostic').show_line_diagnostics()<CR>", opts)
        buf_set_keymap("n", "[d", "<cmd>lua require('lspsaga.diagnostic').lsp_jump_diagnostic_prev()<CR>", opts)
        buf_set_keymap("n", "]d", "<cmd>lua require('lspsaga.diagnostic').lsp_jump_diagnostic_next()<CR>", opts)
        buf_set_keymap("n", "<C-k>", "<cmd>lua require('lspsaga.signaturehelp').signature_help()<CR>", opts)
        -- Code actions
        buf_set_keymap("n", "<leader>ca", "<cmd>lua require('lspsaga.codeaction').code_action()<CR>", opts)
    end
end

local function merged_capabilities()
    -- Maybe update capabilities
    local capabilities = vim.lsp.protocol.make_client_capabilities()
    utils.try_require("cmp-nvim-lsp", function(cmp_nvim_lsp)
        capabilities = cmp_nvim_lsp.update_capabilities(capabilities)
    end)
    return capabilities
end

function M.config_lsp()
    utils.try_require("lspconfig", function(lsp_config)
        local capabilities = merged_capabilities()

        -- Configure each server
        lsp_config.bashls.setup({ capabilities = capabilities, on_attach = default_attach })
        lsp_config.gopls.setup({ capabilities = capabilities, on_attach = default_attach })
        lsp_config.pyright.setup({ capabilities = capabilities, on_attach = default_attach })
        lsp_config.rls.setup({
            capabilities = capabilities,
            on_attach = default_attach,
            settings = {
                rust = {
                    build_on_save = false,
                    all_features = true,
                    unstable_features = true,
                },
            },
        })
    end)
end

function M.config_lsp_saga()
    utils.try_require("lspsaga", function(saga)
        saga.init_lsp_saga({
            error_sign = "🔥",
            warn_sign = "⚠️",
            hint_sign = "🤔",
            dianostic_header_icon = " 💬   ",
            code_action_icon = "💡",
            code_action_prompt = {
                enable = false,
                sign = false,
            },
        })
    end)
end

function M.config_null_ls()
    utils.try_require("null-ls", function(null_ls)
        null_ls.setup({
            on_attach = default_attach,
            capabilities = merged_capabilities(),
            sources = {
                -- Generic
                -- null_ls.builtins.formatting.preittier,
                -- null_ls.builtins.formatting.trim_whitespace,
                -- null_ls.builtins.formatting.trim_newlines,
                -- Fish
                -- null_ls.builtins.formatting.fish_indent,
                -- Python
                null_ls.builtins.formatting.reorder_python_imports,
                null_ls.builtins.formatting.black,
                null_ls.builtins.diagnostics.mypy,
                -- Go
                null_ls.builtins.diagnostics.golangci_lint,
                -- Text
                -- null_ls.builtins.code_actions.proselint,
                -- Ansible
                -- null_ls.builtins.diagnostics.ansiblelint,
                -- Shell
                null_ls.builtins.diagnostics.shellcheck,
                -- Rust
                -- null_ls.builtins.formatting.rustfmt,
                -- Lua
                null_ls.builtins.diagnostics.luacheck,
                null_ls.builtins.formatting.stylua,
            },
        })
    end)
end

function M.config_lsp_intaller()
    utils.try_require("nvim-lsp-installer", function(lsp_installer)
        lsp_installer.on_server_ready(function(server)
            server:setup({
                on_attach = default_attach,
            })
        end)
    end, function()
        print("nvim-lsp-installer not installed")
    end)
end

return M