linux-config/files/dotfiles/nvim/lua/user/lsp/handlers.lua

local vars = require('user.vars')
local M = {}

M.setup = function()
    local signs = {
        { name = "DiagnosticSignError", text = "" },
        { name = "DiagnosticSignWarn",  text = "" },
        { name = "DiagnosticSignHint",  text = "" },
        { name = "DiagnosticSignInfo",  text = "" },
    }

    for _, sign in ipairs(signs) do
        vim.fn.sign_define(sign.name, { texthl = sign.name, text = sign.text, numhl = "" })
    end

    local config = {
        -- show signs
        signs = {
            active = signs,
        },
        update_in_insert = true,
        underline = true,
        severity_sort = true,
    }

    vim.diagnostic.config(config)

    vim.lsp.handlers["textDocument/hover"] = vim.lsp.with(vim.lsp.handlers.hover, {
        border = "rounded",
    })

    vim.lsp.handlers["textDocument/signatureHelp"] = vim.lsp.with(vim.lsp.handlers.signature_help, {
        border = "rounded",
    })
end

local function lsp_highlight_document(client, bufnr)
    if client.server_capabilities.documentHighlightProvider then
        vim.api.nvim_create_augroup("lsp_document_highlight", { clear = true })
        vim.api.nvim_clear_autocmds { buffer = bufnr, group = "lsp_document_highlight" }
        vim.api.nvim_create_autocmd("CursorHold", {
            callback = vim.lsp.buf.document_highlight,
            buffer = bufnr,
            group = "lsp_document_highlight",
            desc = "Document Highlight",
        })
        vim.api.nvim_create_autocmd("CursorMoved", {
            callback = vim.lsp.buf.clear_references,
            buffer = bufnr,
            group = "lsp_document_highlight",
            desc = "Clear All the References",
        })
        local h_bg = vars.themes[vars.colorscheme].highlight_bg_color
        if h_bg then
            vim.cmd('highlight LspReferenceText guifg=NONE guibg=' .. h_bg)
            vim.cmd('highlight LspReferenceWrite guifg=NONE guibg=' .. h_bg)
            vim.cmd('highlight LspReferenceRead guifg=NONE guibg=' .. h_bg)
        end
    end
end

local function lsp_keymaps(bufnr)
    local opts = { noremap = true, silent = true }
    vim.api.nvim_buf_set_keymap(bufnr, "n", "gD", "<cmd>lua vim.lsp.buf.declaration()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "gd", "<cmd>lua vim.lsp.buf.definition()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "K", "<cmd>lua vim.lsp.buf.hover()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "gi", "<cmd>lua vim.lsp.buf.implementation()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "<C-k>", "<cmd>lua vim.lsp.buf.signature_help()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "<leader>rn", "<cmd>lua vim.lsp.buf.rename()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "<leader>e", "<cmd>lua vim.diagnostic.open_float()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "gr", "<cmd>lua vim.lsp.buf.references()<CR>", opts)
    vim.api.nvim_buf_set_keymap(bufnr, "n", "<M-f>", "<cmd>lua vim.lsp.buf.format { async = true }<CR>", opts)
    vim.cmd [[ command! Format execute 'lua vim.lsp.buf.formatting_sync' ]]
end

M.on_attach = function(client, bufnr)
    --if client.name == "tsserver" then
    --    client.server_capabilities.documentFormattingProvider = false
    --end
    lsp_keymaps(bufnr)
    lsp_highlight_document(client, bufnr)
    vim.cmd [[autocmd BufWritePre <buffer> lua vim.lsp.buf.format()]]
end

local capabilities = vim.lsp.protocol.make_client_capabilities()

local status_ok, cmp_nvim_lsp = pcall(require, "cmp_nvim_lsp")
if not status_ok then
    return
end

M.capabilities = cmp_nvim_lsp.default_capabilities(capabilities)

return M