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I regularly run into C-codes without folding. It is irritating to read them if there is no folding, particularly with long files. How can I fold them?
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Opening and closing foldsThe command zc will close a fold (if the cursor is in an open fold), and zo will open a fold (if the cursor is in a closed fold). It's easier to just use za which will toggle the current fold (close it if it was open, or open it if it was closed).
Vim uses the same movement commands to define folds. Folding also works in visual mode. If you enter visual mode using v or V , then select a few lines of text using the movement keys, and type zf , Vim will create a fold comprising those lines. Another option is to specify a range in command mode.
The problem is that when you close Vim, your artfully folded code returns to its unfolded state. The solution is quite simple - when you are ready to save your folds run the :mkview command. This will save your folds in the current buffer to your viewdir ( :h viewdir ) depending on your environment.
To expand the lines, put the cursor over the fold and hit spacebar (in vim terminology, this deletes the fold). (Side note: you may want to change the look of collapsed folds.
To fold according to syntax
:set foldmethod=syntax
If you want to do it manually on the bits you want to fold away
:set foldmethod=manual
then create new folds by selecting / moving and pressing zf e.g.
shift-v j j zf
(ignoring the spaces)
Edit: Also see the comments of this answer for indent and marker foldmethods.
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