I don't think there's anything shorter than
zczA. That's pretty easy and probably what I'd do. I guess you could shorten it a bit with a mapping ;)
:nnoremap <leader>O zczA
But let's say you absolutely can't or don't want to close the already open fold. This is what I came up with...
It's not a Normal mode command but from the command line
foldopen might do what you want...
Let's say you have folds like this...
< indicates an open fold,
F1 is an open fold at line 10.
F1.1 is a closed fold nested inside
F1 that starts +2 lines down.
?? indicates that we can't currently see that line.
If you're on line 10 then this will open
Add a bang,
:+2foldo! and it will operate recursively so
F1.1.1 will open as well. With range
+4 you'll also open
F1.2 as well as any folds nested inside it (if you are using
Hope that makes sense. Play around with it. Note the close equivalent; it is the same format with name
If you're using the Marker type of folds (surrounded with
}}}) then an alternative is to go the end of the first line of the open fold of interest, put the cursor on one of the three
V% which will select everything inside the fold and then hit
zO for recursive open.
None of this is as nice as a simple, short Normal mode key sequence...perhaps someone knows folds better than me and has a better idea...but you could use a mapping to keep it in Normal mode. I haven't tested this yet but I'm thinking along the lines of:
:nnoremap <expr> <leader>zO ':+' . v:count1 . 'foldo!<CR>'
So Normal mode sequence
2\zO should do the same as
Update: @ropeladder has a Normal/Visual mode command that doesn't require closing the outer fold first:
]z : jump to end of current open fold
<s-v> : (Shift-V) start linewise visual mode
[z : jump to beginning of current open fold
zO : recursively open all folds that are visually selected
Of course, it'd be much easier to close the outer fold first and use
zczA but since this doesn't close first and isn't on the command line I figured I'd note it. (And bonus points for