dotfiles/.config/nvim/lua/lsp.lua

require('plugins')
require('keymaps')

packer.use {
    'https://github.com/neovim/nvim-lspconfig',
    requires = 'https://github.com/L3MON4D3/LuaSnip',
    config = function()
        map('n', '<f5>', vim.diagnostic.goto_prev)
        map('n', '<f6>', vim.diagnostic.goto_next)

        -- Only map the following keys after the language server attaches to the
        -- current buffer
        local on_attach = function(client, bufnr)
            local function maplsp(mode, shortcut, command)
                vim.keymap.set(mode, shortcut, command,
                               { noremap = true, silent = true, buffer=bufnr })
            end

            maplsp('n', 'gD', vim.lsp.buf.declaration)
            maplsp('n', 'gd', vim.lsp.buf.definition)
            maplsp('n', 'K', vim.lsp.buf.hover)
            maplsp('n', 'gi', vim.lsp.buf.implementation)
            maplsp('n', '<C-k>', vim.lsp.buf.signature_help)
            maplsp('n', '<Leader>wa', vim.lsp.buf.add_workspace_folder)
            maplsp('n', '<Leader>wr', vim.lsp.buf.remove_workspace_folder)
            maplsp('n', '<Leader>wl', function()
              print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
            end)
            maplsp('n', '<Leader>rn', vim.lsp.buf.rename)
            maplsp('n', '<Leader>ca', vim.lsp.buf.code_action)
            maplsp('n', 'gr', vim.lsp.buf.references)
            maplsp('n', '<Leader>f', vim.lsp.buf.formatting)

            -- highlight symbol under cursor
            if client.resolved_capabilities.document_highlight then
                vim.cmd [[
                hi! LspReferenceRead cterm=bold ctermbg=red guibg=#633466
                hi! LspReferenceText cterm=bold ctermbg=red guibg=#633466
                hi! LspReferenceWrite cterm=bold ctermbg=red guibg=#633466
                ]]
                vim.api.nvim_create_augroup('lsp_document_highlight', {
                    clear = false
                })
                vim.api.nvim_clear_autocmds({
                    buffer = bufnr,
                    group = 'lsp_document_highlight',
                })
                vim.api.nvim_create_autocmd({ 'CursorHold', 'CursorHoldI' }, {
                    group = 'lsp_document_highlight',
                    buffer = bufnr,
                    callback = vim.lsp.buf.document_highlight,
                })
                vim.api.nvim_create_autocmd('CursorMoved', {
                    group = 'lsp_document_highlight',
                    buffer = bufnr,
                    callback = vim.lsp.buf.clear_references,
                })
            end

            vim.api.nvim_create_autocmd("CursorHold", {
                buffer = bufnr,
                callback = function()
                    local opts = {
                        focusable = false,
                        close_events = { "BufLeave", "CursorMoved", "InsertEnter", "FocusLost" },
                        border = 'rounded',
                        source = 'always',
                        prefix = ' ',
                        scope = 'cursor',
                    }
                    vim.diagnostic.open_float(nil, opts)
                end
            })
        end

        -- setup servers
        require'lspconfig'.clangd.setup{
            cmd = {
                'clangd',
                '--compile-commands-dir=build',
                '--clang-tidy',                     -- needs >=clangd-9
                '--ranking-model=decision_forest'   -- needs >=clangd-12
            },
            on_attach = on_attach
        }
    end
}