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Say I have a nnoremap and I want to pass the path of parent directory of current file to it, so the command can use this information. I have read this answer: How can I see the full path of the current file? but Still don't know how to do it?
I just found that % almost do the job, but it returns path to current file.
OK, after some try-and-error I resolved this problem. To get the path to parent dir:
%:p:h
Notice that the :p is needed to get the full path, without it you might end up with nothing, i.e. it's possible you cannot find the parent folder.
For example, my usage:
nnoremap <nowait><silent> <Tab>
\ :Fern %:h -drawer -width=36 -toggle -reveal=%<CR>
As you can see it is used directly inside the command, without any parentheses, single/double quotes, curly braces around it.
expand() when you need this in a context where it is not automatically expanded