nvim/nvim-old/lua/plugins/lspconfig.lua

return {
    -- lsp configuration
    "neovim/nvim-lspconfig",
    event = { "BufReadPre", "BufNewFile" },
    dependencies = {
        "hrsh7th/cmp-nvim-lsp",
        { "antosha417/nvim-lsp-file-operations", config = true },
        -- "mfussenegger/nvim-jdtls",
        "nvim-java/nvim-java"
    },
    config = function()
        require('java').setup()
        -- import lspconfig plugin
        local lspconfig = require("lspconfig")

        -- import cmp-nvim-lsp plugin
        local cmp_nvim_lsp = require("cmp_nvim_lsp")

        local keymap = vim.keymap

        local opts = { silent = true }

        local on_attach = function(client, bufnr)
            opts.buffer = bufnr

            -- set keybinds
            opts.desc = "Show LSP references"
            keymap.set("n", "gR", "<cmd>Telescope lsp_references<CR>", opts)

            opts.desc = "Go to declaration"
            keymap.set("n", "gD", ":lua vim.lsp.buf.declaration", opts)

            opts.desc = "Show LSP definitions"
            keymap.set("n", "gd", "<cmd>Telescope lsp_definitions<CR>", opts)

            opts.desc = "Show LSP implementations"
            keymap.set("n", "gi", "<cmd>Telescope lsp_implementations<CR>", opts)

            opts.desc = "Show LSP type definitions"
            keymap.set("n", "gt", "<cmd>Telescope lsp_type_definitions<CR>", opts)

            opts.desc = "See available code actions"
            keymap.set({ "n", "v" }, "<leader>ca", vim.lsp.buf.code_action, opts)

            opts.desc = "Format current file"
            keymap.set("n", "<leader>gf", vim.lsp.buf.format, opts)

            opts.desc = "Smart rename"
            keymap.set("n", "<leader>n", vim.lsp.buf.rename, opts)

            opts.desc = "Show buffer diagnostics"
            keymap.set("n", "ga", "<cmd>Telescope diagnostics bufnr=0<CR>", opts)

            opts.desc = "Show line diagnostics"
            keymap.set("n", "gA", ":lua vim.diagnostic.open_float()<CR>", opts)

            opts.desc = "Go to previous diagnostic"
            keymap.set("n", "[d", vim.diagnostic.goto_prev, opts)

            opts.desc = "Go to next diagnostic"
            keymap.set("n", "]d", vim.diagnostic.goto_next, opts)

            opts.desc = "Show documentation for what is under cursor"
            keymap.set("n", "<leader>k", vim.lsp.buf.hover, opts)

            opts.desc = "Restart LSP"
            keymap.set("n", "<leader>rs", ":LspRestart<CR>", opts)

            vim.opt.signcolumn = "yes" -- reserve space for diagnostics
        end

        -- used to enable autocompletion (assign to every lsp server config)
        -- local capabilities = cmp_nvim_lsp.default_capabilities()
        local capabilities = vim.lsp.protocol.make_client_capabilities()
        capabilities.textDocument.completion.completionItem.snippetSupport = true

        -- Change the Diagnostic symbols in the sign column (gutter)
        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 = "" })
        end

        lspconfig.bashls.setup({
            capabilities = capabilities,
            on_attach = on_attach,
        })

        lspconfig.clangd.setup({
            cmd = {
                "clangd",
                "--suggest-missing-includes",
                "--clang-tidy",
            },
            filetypes = { "c", "cpp", "objc", "objcpp", "cuda", "proto", "ino" },
            capabilities = capabilities,
            on_attach = on_attach,
        })

        lspconfig.cssls.setup({
            capabilities = capabilities,
            on_attach = on_attach,
        })

        lspconfig.html.setup({
            capabilities = capabilities,
            on_attach = on_attach,
        })

        lspconfig.lua_ls.setup({
            capabilities = capabilities,
            on_attach = on_attach,
            settings = {
                Lua = {
                    -- make the language server recognize "vim" global
                    diagnostics = {
                        globals = { "vim" },
                    },
                    workspace = {
                        -- make language server aware of runtime files
                        library = {
                            [vim.fn.expand("$VIMRUNTIME/lua")] = true,
                            [vim.fn.stdpath("config") .. "/lua"] = true,
                        },
                    },
                },
            },
        })

        lspconfig.pyright.setup({
            capabilities = capabilities,
            on_attach = on_attach,
        })

        local java_on_attach = function(client, bufnr)
            on_attach(client, bufnr)

            opts.buffer = bufnr
            -- Keybinds for testing, refactoring, java specific
            opts.desc = "Java profiling"
            keymap.set("n", "<leader>jp", ":JavaProfile<CR>", opts)

            opts.desc = "Java Refactor: Extract Variable (create variable from cursor)"
            keymap.set("n", "<leader>jev", ":JavaExtractVariable<CR>", opts)

            opts.desc = "Java Refactor: Extract Variable all occurrences (create variable from cursor)"
            keymap.set("n", "<leader>jea", ":JavaExtractVariableAllOccurrence<CR>", opts)

            opts.desc = "Java Refactor: Extract Const (create const from cursor)"
            keymap.set("n", "<leader>jec", ":JavaExtractConst<CR>", opts)

            opts.desc = "Java Refactor: Extract Method (create method from cursor)"
            keymap.set("n", "<leader>jev", ":JavaExtractMethod<CR>", opts)

            opts.desc = "Java Refactor: Extract Field (create field from cursor)"
            keymap.set("n", "<leader>jev", ":JavaExtractField<CR>", opts)

            -- Java testing, Debugging
            opts.desc = "Java Testing: Run test class in buffer"
            keymap.set("n", "<leader>jtc", ":JavaTestRunCurrentClass<CR>", opts)

            opts.desc = "Java Testing: Debug test class in buffer"
            keymap.set("n", "<leader>jdc", ":JavaTestDebugCurrentClass<CR>", opts)

            opts.desc = "Java Testing: Run current method in buffer"
            keymap.set("n", "<leader>jtm", ":JavaTestRunCurrentMethod<CR>", opts)

            opts.desc = "Java Testing: Debug current method in buffer"
            keymap.set("n", "<leader>jdm", ":JavaTestDebugCurrentMethod<CR>", opts)

            opts.desc = "Java Testing: View last report"
            keymap.set("n", "<leader>jtv", ":JavaTestViewLastReport<CR>", opts)
        end

        lspconfig.jdtls.setup({
            capabilities = capabilities,
            on_attach = java_on_attach,
        })

        lspconfig.texlab.setup{
            cmd = { "texlab" },
            filetypes = { "tex", "latex", "bib" },
            root_dir = function(fname)
                return vim.loop.cwd()
            end,
        }

    end,
}