Added lsp on_attach function

.config/nvim/lua/plugins.lua

@@ -109,17 +109,46 @@ g.tagbar_autoclose = 1
 nmap("tr", ":TagbarToggle<CR>")
 
 -- neovim/neovim-lspconfig
+local function on_attach(client, bufnr)
+    local opts = {
+        silent = true,
+        noremap = true,
+    }
+    local function buf_nmap(mapping, cmd) vim.api.nvim_buf_set_keymap(bufnr, "n", mapping, cmd, opts) end
+
+    -- Jump to definition
+    buf_nmap("gd", "<Cmd>lua vim.lsp.buf.definition()<CR>")
+    -- Format current buffer on write
+    vim.api.nvim_command([[autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting_seq_sync()]])
+    -- Show diagnostics for current line
+    buf_nmap("<leader>dd", "<Cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>")
+    -- Jump between diagnostic messages
+    buf_nmap("<leader>dj", "<Cmd>lua vim.lsp.diagnostic.goto_next()<CR>")
+    buf_nmap("<leader>dk", "<Cmd>lua vim.lsp.diagnostic.goto_previous()<CR>")
+    -- Rename symbol under cursor
+    buf_nmap("<leader>dr", "<Cmd>lua vim.lsp.buf.rename()<CR>")
+    -- Show hover info
+    buf_nmap("<leader>df", "<Cmd>lua vim.lsp.buf.hover()<CR>")
+end
+
 -- Comes with clang
-require'lspconfig'.clangd.setup{}
+require'lspconfig'.clangd.setup{on_attach = on_attach}
 -- NPM: dockerfile-language-server-nodejs
 require'lspconfig'.dockerls.setup{}
 -- Pacman: haskell-language-server
 -- AUR: haskell-language-server-bin
 -- GH: https://github.com/haskell/haskell-language-server
-require'lspconfig'.hls.setup{}
+require'lspconfig'.hls.setup{
+    on_attach = on_attach,
+    settings = {
+        haskell = {
+            formattingProvider = "stylish-haskell"
+        }
+    }
+}
 -- Pacman: rust-analyzer
 -- GH: https://github.com/rust-analyzer/rust-analyzer
-require'lspconfig'.rust_analyzer.setup{}
+require'lspconfig'.rust_analyzer.setup{on_attach = on_attach}
 -- Installed using R shell:
 -- `install.packages('languageserver')`
 -- GH: https://github.com/REditorSupport/languageserver