vim: Drop nvim-cmp for cmdline completion

It's a dumpster fire. Not salvageable. See
hrsh7th/cmp-cmdline#83 (comment)
and hrsh7th/cmp-cmdline#110 (comment)

.config/nvim/lua/init/plug_cmp.lua

@@ -86,14 +86,6 @@ local function cmp_complete_snippet()
 	}
 end
 
-local function map(modes, func)
-	local res = {}
-	for _, mode in ipairs(modes) do
-		res[mode] = func
-	end
-	return res
-end
-
 cmp.setup {
 	completion = {
 		autocomplete = false,
@@ -174,41 +166,6 @@ cmp.setup {
 	},
 }
 
-cmp.setup.cmdline(':', {
-	mapping = vim.tbl_map(function(f) return map({'c'}, f) end, {
-		['<Tab>'] = function(_fallback)
-			if cmp.visible() then
-				if #cmp.get_entries() == 1 then
-					cmp.confirm()
-				else
-					cmp_select_next()
-				end
-			else
-				cmp.complete()
-			end
-		end,
-		['<S-Tab>'] = cmp_or(cmp_select_prev),
-		['<Down>'] = cmp_or(cmp_select_next),
-		['<Up>'] = cmp_or(cmp_select_prev),
-		['<PageDown>'] = cmp_or(cmp_select_next_page),
-		['<PageUp>'] = cmp_or(cmp_select_prev_page),
-		['<Right>'] = cmp_or(cmp.confirm),
-		['<Left>'] = cmp_or(cmp.abort),
-		['<CR>'] = cmp_or(cmp.confirm),
-		['<C-N>'] = cmp_or(cmp_select_next),
-		['<C-P>'] = cmp_or(cmp_select_prev),
-	}),
-	sources = cmp.config.sources({{ name = 'cmdline' }}),
-	---@diagnostic disable-next-line: missing-fields
-	matching = {
-		disallow_symbol_nonprefix_matching = false,
-	},
-	---@diagnostic disable-next-line: missing-fields
-	formatting = {
-		fields = { 'abbr', 'menu' },
-	},
-})
-
 cmp.event:on('menu_opened', function(data)
 	-- start with an active entry
 	-- work around https://github.com/hrsh7th/nvim-cmp/issues/835

.gitmodules

@@ -132,9 +132,6 @@
 	path = .local/share/nvim/site/bundle/nvim-cmp
 	# url = https://github.com/hrsh7th/nvim-cmp
 	url = https://github.com/liskin/nvim-cmp
-[submodule ".local/share/nvim/site/bundle/cmp-cmdline"]
-	path = .local/share/nvim/site/bundle/cmp-cmdline
-	url = https://github.com/hrsh7th/cmp-cmdline
 [submodule ".local/share/nvim/site/bundle/cmp-nvim-lsp"]
 	path = .local/share/nvim/site/bundle/cmp-nvim-lsp
 	url = https://github.com/hrsh7th/cmp-nvim-lsp

.vimrc

@@ -610,6 +610,19 @@ if !has('nvim')
 	inoremap <silent> <S-Tab> <C-R>=LiskinShiftTabComplete()<CR>
 endif
 
+" emulate vim's wildoptions=pum bindings in neovim {{{2
+if has('nvim')
+	cnoremap <expr> <Up> wildmenumode() ? "\<Left>" : "\<Up>"
+	cnoremap <expr> <Down> wildmenumode() ? "\<Right>" : "\<Down>"
+	cnoremap <expr> <Left> wildmenumode() ? "\<Up>" : "\<Left>"
+	cnoremap <expr> <Right> wildmenumode() ? "\<Down>" : "\<Right>"
+
+	" also make it behave slightly more like ins-completion
+	set wildcharm=<C-Z>
+	cnoremap <expr> <Tab> wildmenumode() ? "\<Right>" : "\<C-Z>"
+	cnoremap <expr> <CR> wildmenumode() ? "\<C-Y>" : "\<CR>"
+endif
+
 " cloning/closing tabs {{{2
 nnoremap <silent> <C-W>S <Cmd>:CloneBufTmp<CR>
 nnoremap <silent> <C-W>C <Cmd>:tabclose<CR>