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In my .vimrc I've put set foldmethod=syntax to enable folding of methods etc. However, I don't like the default that everytime I open a file, the whole thing is folded. Is there a way to enable foldmethod, yet have files unfolded when I open them?

tshepang
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Suan
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8 Answers8

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You can put this in your .vimrc: au BufRead * normal zR

It declares an automatic command (au), triggered when a buffer is read (BufRead), matching all files (*) and executes the zR (opens all folds) command in normal mode.

Walter
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set foldlevel=99

should open all folds, regardless of method used for folding. With foldlevel=0 all folded, foldlevel=1 only somes, ... higher numbers will close fewer folds.

Rook
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    but this will lead to a problem: pressing `zm` will not close all folds, unless you enter it 99 times – bitboxer Apr 05 '13 at 07:20
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    You could also `set nofoldenable`, which temporarily disables folding when you open the file, but all folds are restored as soon as you hit `zc` – 79E09796 May 30 '13 at 08:22
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    To set the exact foldlevel you can use `:autocmd BufWinEnter * let &foldlevel = max(map(range(1, line('$')), 'foldlevel(v:val)'))` (taken from [an answer on superuser](http://superuser.com/questions/567352)). – Matthew Strawbridge Sep 13 '13 at 21:16
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    @bitboxer _"but this will lead to a problem: pressing zm will not close all folds"_ Use `zM` to close all folds. – wisbucky Jun 03 '14 at 21:34
  • To expand on wisbucky's reply, `99` is not a problem since `zM` indeed completely corrects its effects. See `:help foldlevel` and `:help zm`. `foldlevel=0` is a buffer value, defaulting to `0`, and easily reset, as witbucky points out, with `zM`. To add to 79E09796's great idea, `zi` is also nice, inverting `foldenable`, which remembers your fold choices. – Brady Trainor Aug 20 '14 at 21:48
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    @79E09796 You should move your comment to an answer of its own. – Josh May 14 '16 at 01:18
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set nofoldenable

Adding this to your .vimrc will temporarily disable folding when you open the file, but folds can still be restored with zc

79E09796
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    Useful - but when you zc a fold it then hides all other folds also all-at-once. I think i like personally defaulting to foldlevel=99 as it keeps 'zc' then localized to individual chunk you are looking at when invoked. – wom May 11 '18 at 14:30
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In .vimrc add an autocmd for BufWinEnter to open all folds automatically like this:

autocmd BufWinEnter * silent! :%foldopen!

That tell vim to execute the silent :%foldopen! after opening BunWinEnter event (see :h BufWinEnter). The silent %foldopen! will execute foldopen on the whole buffer thanks to the % and will open all folds recursively because of the !. Any eventual error message will be suppressed by silent. (You could get error messages like E490: No fold found if the buffer actually didn't contain any fold yet)

Note: You could use BufRead instead of BufWinEnter but then if the file has a modeline that enables the folding that will override this autocmd. I mean BufRead autocmds run before the modeline is processed and BufWinEnter will run them after. I find the later to be more useful

RubenLaguna
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  • Why not just use a modeline that set different fold options per file? – MarkHu Dec 21 '16 at 23:02
  • how to use the modeline to achieve this? – huangzonghao Oct 05 '18 at 00:55
  • using `autocmd` here allows to open all folds for *all files* using a modeline it just to apply to that file and assumes that you can modify the file (it could be a read only file). The modeline would look like `# vim: set foldlevel=99` at the top or bottom of the file – RubenLaguna Oct 05 '18 at 08:14
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You can add

set foldlevelstart=99

to your .vimrc file, and it will start editing any new file with all folds open.

sje397
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3

If you want a way to have it display unfolded as soon as it is opened, you can use set foldlevelstart=99 as a lot of answers explained.

But, if you just want to see them unfolded, you can just press zi and it will unfold everything. Another, zi will close them back.

Durga Swaroop
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0

You can open unfolded file when you put set nofoldenable into your .vimrc file.

Junyeong Choi
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You could map it to keys to enable it. For example,

nmap ,f :set foldmethod=syntax<CR>

Then while in normal mode hit the ",f" key combination

pjob
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