vim: Add lsp completion

home/vim-dev/default.nix

@@ -18,9 +18,12 @@ in {
     [
       # More fancy shit
       nvim-treesitter
-      # Language stuff
-      nvim-lspconfig
       trouble-nvim
+      # Language server/completions 
+      nvim-lspconfig
+      nvim-cmp
+      cmp-nvim-lsp
+      # Language specific
       rust-vim
       vim-terraform
       vim-protobuf

home/vim-dev/dev.lua

@@ -9,12 +9,35 @@ local on_attach = function(client, bufnr)
   vim.api.nvim_buf_set_keymap(bufnr, 'n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
 end
 
--- Enable Language LSPs
+-- Completion
+local cmp = require'cmp'
+cmp.setup({
+  window = {
+    -- completion = cmp.config.window.bordered(),
+    -- documentation = cmp.config.window.bordered(),
+  },
+  mapping = cmp.mapping.preset.insert({
+    ['<C-Space>'] = cmp.mapping.complete(),
+    ['<C-e>'] = cmp.mapping.abort(),
+    ['<CR>'] = cmp.mapping.confirm({ select = true }),
+  }),
+  sources = cmp.config.sources({
+    { name = 'nvim_lsp' },
+  }),
+}, {
+  { name = 'buffer' },
+})
+
+-- Language servers
+local capabilities = require('cmp_nvim_lsp').default_capabilities()
+
 require'lspconfig'.gopls.setup{
   on_attach = on_attach,
+  capabilities = capabilities,
 }
 require'lspconfig'.pylsp.setup{
   on_attach = on_attach,
+  capabilities = capabilities,
   handlers = {
     ["textDocument/publishDiagnostics"] = vim.lsp.with(
       vim.lsp.diagnostic.on_publish_diagnostics, {
@@ -25,21 +48,26 @@ require'lspconfig'.pylsp.setup{
   }
 }
 require'lspconfig'.rnix.setup{
-  on_attach = on_attach
+  on_attach = on_attach,
+  capabilities = capabilities,
 }
 require'lspconfig'.rust_analyzer.setup{
-  on_attach = on_attach
+  on_attach = on_attach,
+  capabilities = capabilities,
 }
 require'lspconfig'.dhall_lsp_server.setup{
-  on_attach = on_attach
+  on_attach = on_attach,
+  capabilities = capabilities,
 }
 require'lspconfig'.eslint.setup{
-  on_attach = on_attach
+  on_attach = on_attach,
+  capabilities = capabilities,
 }
 -- Configure volar (vuejs language server stuff) in "takeover" mode
 require'lspconfig'.volar.setup{
+  on_attach = on_attach,
+  capabilities = capabilities,
   filetypes = {'typescript', 'javascript', 'javascriptreact', 'typescriptreact', 'vue', 'json'},
-  on_attach = on_attach
 }
 --[[ If we didn't have takeover mode enabled above, we'd want this
 require'lspconfig'.tsserver.setup{