patch 8.1.1113: making an autocommand trigger once is not so easy
Problem: Making an autocommand trigger once is not so easy.
Solution: Add the ++once argument. Also add ++nested as an alias for
"nested". (Justin M. Keyes, closes #4100)
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index 71df515..b89af18 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -1415,4 +1415,74 @@
bwipe!
endfunc
+func Test_autocmd_nested()
+ let g:did_nested = 0
+ augroup Testing
+ au WinNew * edit somefile
+ au BufNew * let g:did_nested = 1
+ augroup END
+ split
+ call assert_equal(0, g:did_nested)
+ close
+ bwipe! somefile
+
+ " old nested argument still works
+ augroup Testing
+ au!
+ au WinNew * nested edit somefile
+ au BufNew * let g:did_nested = 1
+ augroup END
+ split
+ call assert_equal(1, g:did_nested)
+ close
+ bwipe! somefile
+
+ " New ++nested argument works
+ augroup Testing
+ au!
+ au WinNew * ++nested edit somefile
+ au BufNew * let g:did_nested = 1
+ augroup END
+ split
+ call assert_equal(1, g:did_nested)
+ close
+ bwipe! somefile
+
+ augroup Testing
+ au!
+ augroup END
+
+ call assert_fails('au WinNew * ++nested ++nested echo bad', 'E983:')
+ call assert_fails('au WinNew * nested nested echo bad', 'E983:')
+endfunc
+
+func Test_autocmd_once()
+ " Without ++once WinNew triggers twice
+ let g:did_split = 0
+ augroup Testing
+ au WinNew * let g:did_split += 1
+ augroup END
+ split
+ split
+ call assert_equal(2, g:did_split)
+ call assert_true(exists('#WinNew'))
+ close
+ close
+
+ " With ++once WinNew triggers once
+ let g:did_split = 0
+ augroup Testing
+ au!
+ au WinNew * ++once let g:did_split += 1
+ augroup END
+ split
+ split
+ call assert_equal(1, g:did_split)
+ call assert_false(exists('#WinNew'))
+ close
+ close
+
+ call assert_fails('au WinNew * ++once ++once echo bad', 'E983:')
+endfunc
+
" FileChangedShell tested in test_filechanged.vim