Support vimscript null coalescing operator (aka falsy operator)

[mraveloarinjaka]

Problem

The null coalescing operator is not supported in vimscript.
The expression :echo ('test' ?? 'default') returns E15: Invalid expression: ? 'default').
Will you be open to amend the vimL parser to support that operator?

Expected behavior

The expression :echo ('test' ?? 'default') returns 'test'.

[mraveloarinjaka]

If you are ok to update the parser I can try to devise a patch of https://github.com/neovim/neovim/blob/master/src/nvim/viml/parser/expressions.c

[bfredl]

https://github.com/neovim/neovim/blob/master/src/nvim/viml/parser/expressions.c is not relevant for this. What is needed is porting vim-patch 8.2.1794.

[bfredl]

ok it is needed for i<c-r>=(foo ?? bar) highlighting, but for actual execution (which would be the first step), we need the patch.

[mraveloarinjaka]

Sorry in advance if my question sounds dumb: I am not familiar with neovim codeline.
What do you mean by vim-patch 8.2.1794? Is it a specific tag I should look up in the vim repository? Is it a patch available somewhere in the neovim repository that could not be merged?

[mraveloarinjaka]

never mind I just saw https://github.com/neovim/neovim/wiki/Merging-patches-from-upstream-Vim
I should have read the doc

[zeertzjq]

The patch has been merged. However it seems that the command line highlighter doesn't currently support any of the following:

• Blobs
• Method call
• Falsy coalescing operator

[zeertzjq]

I think this can be closed as the original request has been resolved.