Merge #8576 from justinmk/startup-empty-stdin

src/nvim/main.c

@@ -1410,6 +1410,12 @@ static void read_stdin(void)
   int save_msg_didany = msg_didany;
   set_buflisted(true);
   (void)open_buffer(true, NULL, 0);  // create memfile and read file
+  if (BUFEMPTY() && curbuf->b_next != NULL) {
+    // stdin was empty, go to buffer 2 (e.g. "echo file1 | xargs nvim"). #8561
+    do_cmdline_cmd("silent! bnext");
+    // Delete the empty stdin buffer.
+    do_cmdline_cmd("bwipeout 1");
+  }
   no_wait_return = false;
   msg_didany = save_msg_didany;
   TIME_MSG("reading stdin");

test/functional/core/startup_spec.lua

@@ -122,6 +122,18 @@ describe('startup', function()
                     { 'ohyeah', '' }))
   end)
 
+  it('if stdin is empty: selects buffer 2, deletes buffer 1 #8561', function()
+    eq('\r\n  2 %a   "file1"                        line 0\r\n  3      "file2"                        line 0',
+       funcs.system({nvim_prog, '-n', '-u', 'NONE', '-i', 'NONE', '--headless',
+                     '+ls!',
+                     '+qall!',
+                     '-',
+                     'file1',
+                     'file2',
+                    },
+                    { '' }))
+  end)
+
   it('-e/-E interactive #7679', function()
     clear('-e')
     local screen = Screen.new(25, 3)