new

lua/core/events.lua

@@ -29,6 +29,39 @@ vim.api.nvim_create_user_command('MessagesToBuffer', function()
   vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
 end, { desc = 'Open :messages output in a scratch buffer' })
 
+vim.api.nvim_create_user_command('CmdToBuffer', function(opts)
+  local cmd = table.concat(opts.fargs, ' ')
+
+  vim.g.__cmd_to_buffer_cmd = cmd
+  vim.g.__cmd_to_buffer_out = nil
+
+  local exec_line = opts.bang and 'silent execute' or 'execute'
+  local ok, err = pcall(vim.cmd, string.format(
+    [[
+      redir => g:__cmd_to_buffer_out
+      %s g:__cmd_to_buffer_cmd
+      redir END
+    ]],
+    exec_line
+  ))
+  if not ok then
+    pcall(vim.cmd, 'redir END')
+    error(err)
+  end
+
+  local output = vim.g.__cmd_to_buffer_out or ''
+  vim.g.__cmd_to_buffer_cmd = nil
+  vim.g.__cmd_to_buffer_out = nil
+  local lines = vim.split(output, '\n', { plain = true, trimempty = false })
+
+  vim.cmd('new')
+  local bufnr = vim.api.nvim_get_current_buf()
+  vim.bo[bufnr].buftype = 'nofile'
+  vim.bo[bufnr].bufhidden = 'wipe'
+  vim.bo[bufnr].swapfile = false
+  vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines)
+end, { nargs = '+', bang = true, complete = 'command', desc = 'Run an Ex command and open its output in a scratch buffer' })
+
 -- Automatically create a scratch buffer if Neovim starts with no files
 au('VimEnter', {
   group = group,