如何激活vim折叠标记？

Question

I have inherited some c++ code with vim-based folding markers like this:

// CONSTRUCTORS/DESTRUCTORS /*{{{*/
Foo::Foo()
{
}
Foo::~Foo()
{
}
/*}}}*/

What do I need to put into my .vimrc to enable folding toggles like zm and space-bar?

With my current settings, when I hit space bar inside or zm, vim does nothing.

Answer 1

The default keybindings for folding are za or zm (though zm I think only closes folds, while za toggles them), so you should add the following lines to your .vimrc:

set foldmethod=marker to enable folding triggered by markers (the {{{ things in your code)

nnoremap <space> za to enable space to trigger the fold in normal mode.

But! if you're not sure if you want to enable folding in other files, you could use autocmd s, like so:

autocmd FileType vim,c++,txt setlocal foldmethod=marker and that will ensure that folding only works in vim, c++, and text files.

By the way, what you've posted is only one kind of folding mentioned by vim guru Steve Losh in this article . Read it to learn more about folding. It's super cool.

Answer 2

OK, after googling around for a bit, I found this which seems to work:

set foldmethod=marker                                                                 |~
nnoremap <space> za

Answer 3

If you only have a few files or if you just wish to control option(s) on a per file basis you may want to use modeline . My intro to folding came when I download a z-shell script and when I opened it, was surprised to find everything folded. Found something like this at the end of the file:

# vim:ts=4:sw=4:ai:foldmethod=marker:foldlevel=0:

Change commenting to match your code type, and insure there is a space before the word vim . As always a good place to start: :help modeline and :help folding . You may have to add set modeline to your .vimrc file if modeline was not set at build time.