Squashed commit of the following:

commit 35bbfb270aaa17ab0bea37b50f85068b28e1d1a9
Author: Alex Yatskov <alex@foosoft.net>
Date:   Wed Oct 13 20:05:12 2021 -0700

    Disable snippets

commit bc03ffc0c123149fce2c23f29a61c7a7f2d6a730
Author: Alex Yatskov <alex@foosoft.net>
Date:   Wed Oct 13 17:51:23 2021 -0700

    Switch to nvim lsp

.gitmodules

@@ -70,12 +70,24 @@
 [submodule ".vim/pack/plugins/start/vim-fugitive"]
 	path = pack/plugins/start/vim-fugitive
 	url = https://github.com/tpope/vim-fugitive.git
-[submodule "pack/plugins/start/coc.nvim"]
-	path = pack/plugins/opt/coc.nvim
-	url = https://github.com/neoclide/coc.nvim
 [submodule "pack/plugins/start/vim-rooter"]
 	path = pack/plugins/start/vim-rooter
 	url = https://github.com/airblade/vim-rooter.git
 [submodule "pack/plugins/start/vim-polyglot"]
 	path = pack/plugins/start/vim-polyglot
 	url = https://github.com/sheerun/vim-polyglot
+[submodule "pack/plugins/opt/cmp-nvim-lsp"]
+	path = pack/plugins/opt/cmp-nvim-lsp
+	url = https://github.com/hrsh7th/cmp-nvim-lsp.git
+[submodule "pack/plugins/opt/nvim-lspconfig"]
+	path = pack/plugins/opt/nvim-lspconfig
+	url = https://github.com/neovim/nvim-lspconfig.git
+[submodule "pack/plugins/opt/nvim-cmp"]
+	path = pack/plugins/opt/nvim-cmp
+	url = https://github.com/hrsh7th/nvim-cmp.git
+[submodule "pack/plugins/opt/cmp-vsnip"]
+	path = pack/plugins/opt/cmp-vsnip
+	url = https://github.com/hrsh7th/cmp-vsnip
+[submodule "pack/plugins/opt/vim-vsnip"]
+	path = pack/plugins/opt/vim-vsnip
+	url = https://github.com/hrsh7th/vim-vsnip

install.sh

@@ -1,6 +1,2 @@
 #!/bin/bash
 git submodule update --init --recursive
-pushd ./pack/plugins/opt/coc.nvim/
-npm install
-npm run build
-popd

options.vim

@@ -13,7 +13,6 @@ set background=dark
 set backspace=indent,eol,start
 set belloff=all
 set complete-=i
-set completeopt=menuone,noinsert
 set encoding=utf-8
 set expandtab
 set fileformats=unix,dos,mac

pack/plugins/opt/cmp-nvim-lsp

@@ -0,0 +1 @@
+Subproject commit f93a6cf9761b096ff2c28a4f0defe941a6ffffb5

pack/plugins/opt/cmp-vsnip

@@ -0,0 +1 @@
+Subproject commit 1588c35bf8f637e8f5287477f31895781858f970

pack/plugins/opt/coc.nvim

@@ -1 +0,0 @@
-Subproject commit 03c9add7cd867a013102dcb45fb4e75304d227d7

pack/plugins/opt/nvim-cmp

@@ -0,0 +1 @@
+Subproject commit f5393d5bd934428a469f03f5bc225922f8c48367

pack/plugins/opt/nvim-lspconfig

@@ -0,0 +1 @@
+Subproject commit e4bed57f127310764f08e8b45f1ed3a31c6094e0

pack/plugins/opt/vim-vsnip

@@ -0,0 +1 @@
+Subproject commit 9ac8044206d32bea4dba34e77b6a3b7b87f65df6

plugins.vim

@@ -1,31 +1,74 @@
-" coc.nvim
-if executable('node')
-    packadd coc.nvim
+" cmp-nvim-lsp, nvim-cmp, nvim-lspconfig
+if has('nvim')
+    packadd cmp-nvim-lsp
+    packadd nvim-cmp
+    packadd nvim-lspconfig
 
-    highlight CocErrorSign ctermfg=Red guifg=#dc322f
-    highlight CocWarningSign ctermfg=Yellow guifg=#b58900
-    highlight CocInfoHighlight ctermfg=Blue guifg=#268bd2
+lua << EOF
+    -- Use an on_attach function to only map the following keys
+    -- after the language server attaches to the current buffer
+    local on_attach = function(client, bufnr)
+        local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
+        local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end
 
-    let g:coc_disable_startup_warning = 1
+        -- Enable completion triggered by <c-x><c-o>
+        buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
 
-    nmap <silent> [g <Plug>(coc-diagnostic-prev)
-    nmap <silent> ]g <Plug>(coc-diagnostic-next)
-    nmap <silent> gd <Plug>(coc-definition)
-    nmap <silent> gy <Plug>(coc-type-definition)
-    nmap <silent> gi <Plug>(coc-implementation)
-    nmap <silent> gr <Plug>(coc-references)
+        -- Mappings.
+        local opts = { noremap=true, silent=true }
 
-    if has('nvim-0.4.0') || has('patch-8.2.0750')
-        nnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
-        nnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
-        inoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(1)\<cr>" : "\<Right>"
-        inoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? "\<c-r>=coc#float#scroll(0)\<cr>" : "\<Left>"
-        vnoremap <silent><nowait><expr> <C-f> coc#float#has_scroll() ? coc#float#scroll(1) : "\<C-f>"
-        vnoremap <silent><nowait><expr> <C-b> coc#float#has_scroll() ? coc#float#scroll(0) : "\<C-b>"
-    endif
+        -- See `:help vim.lsp.*` for documentation on any of the below functions
+        buf_set_keymap('n', 'gD', '<cmd>lua vim.lsp.buf.declaration()<CR>', opts)
+        buf_set_keymap('n', 'gd', '<cmd>lua vim.lsp.buf.definition()<CR>', opts)
+        buf_set_keymap('n', 'K', '<cmd>lua vim.lsp.buf.hover()<CR>', opts)
+        buf_set_keymap('n', 'gi', '<cmd>lua vim.lsp.buf.implementation()<CR>', opts)
+        buf_set_keymap('n', '<C-k>', '<cmd>lua vim.lsp.buf.signature_help()<CR>', opts)
+        buf_set_keymap('n', '<space>wa', '<cmd>lua vim.lsp.buf.add_workspace_folder()<CR>', opts)
+        buf_set_keymap('n', '<space>wr', '<cmd>lua vim.lsp.buf.remove_workspace_folder()<CR>', opts)
+        buf_set_keymap('n', '<space>wl', '<cmd>lua print(vim.inspect(vim.lsp.buf.list_workspace_folders()))<CR>', opts)
+        buf_set_keymap('n', '<space>D', '<cmd>lua vim.lsp.buf.type_definition()<CR>', opts)
+        buf_set_keymap('n', '<space>rn', '<cmd>lua vim.lsp.buf.rename()<CR>', opts)
+        buf_set_keymap('n', '<space>ca', '<cmd>lua vim.lsp.buf.code_action()<CR>', opts)
+        buf_set_keymap('n', 'gr', '<cmd>lua vim.lsp.buf.references()<CR>', opts)
+        buf_set_keymap('n', '<space>e', '<cmd>lua vim.lsp.diagnostic.show_line_diagnostics()<CR>', opts)
+        buf_set_keymap('n', '[d', '<cmd>lua vim.lsp.diagnostic.goto_prev()<CR>', opts)
+        buf_set_keymap('n', ']d', '<cmd>lua vim.lsp.diagnostic.goto_next()<CR>', opts)
+        buf_set_keymap('n', '<space>q', '<cmd>lua vim.lsp.diagnostic.set_loclist()<CR>', opts)
+        buf_set_keymap('n', '<space>f', '<cmd>lua vim.lsp.buf.formatting()<CR>', opts)
+    end
 
-    inoremap <expr><tab> pumvisible() ? '<C-y>' : '<tab>'
-    inoremap <expr><cr> pumvisible() ? '<C-e><cr>' : '<cr>'
+    -- Add additional capabilities supported by nvim-cmp
+    local capabilities = vim.lsp.protocol.make_client_capabilities()
+    capabilities = require('cmp_nvim_lsp').update_capabilities(capabilities, {snippetSupport = false})
+
+    -- Use a loop to conveniently call 'setup' on multiple servers and
+    -- map buffer local keybindings when the language server attaches
+    local nvim_lsp = require('lspconfig')
+    for _, lsp in ipairs({'jedi_language_server', 'gopls', 'clangd'}) do
+        nvim_lsp[lsp].setup({
+            on_attach = on_attach,
+            capabilities = capabilities
+        })
+    end
+
+    -- nvim-cmp setup
+    local cmp = require('cmp')
+    cmp.setup {
+        mapping = {
+            ['<C-d>'] = cmp.mapping.scroll_docs(-4),
+            ['<C-f>'] = cmp.mapping.scroll_docs(4),
+            ['<C-n>'] = cmp.mapping.select_next_item(),
+            ['<C-p>'] = cmp.mapping.select_prev_item(),
+            ['<Tab>'] = cmp.mapping.confirm({select = true}),
+        },
+        sources = {
+            {name = 'nvim_lsp'},
+        },
+    }
+
+    -- Set completeopt to have a better completion experience
+    vim.o.completeopt = 'menuone,noselect'
+EOF
 endif
 
 " fzf