I am trying to write a function that runs before a new file is created, or an existing file is opened. What I would like to do is edit the path to the file which is being opened depending on the path.
At the very beginning of my journey to solve above is find the autocmds that will fire.
:h autocmd-events it says that one of the following 4 autocmds are run whenever a file is created/opened:
For READING FILES there are four kinds of events possible: BufNewFile starting to edit a non-existent file BufReadPre BufReadPost starting to edit an existing file FilterReadPre FilterReadPost read the temp file with filter output FileReadPre FileReadPost any other file read Vim uses only one of these four kinds when reading a file. The "Pre" and "Post" events are both triggered, before and after reading the file.
However I never see any of the following messages echo'ed:
augroup my_au_test_group " Clear existing autocmds for this group autocmd! autocmd BufNewFile * :echom "......BufNewFile " autocmd BufReadPre * :echom "......BufReadPre " autocmd FilterReadPre * :echom "......FilterReadPre" autocmd FileReadPre * :echom "......FileReadPre " echom "Auto commands set" augroup END
I can see the message "Auto commands set" to verify that the file was sourced correctly.
:new and or open a file, and I don't see any of the messages printed. I have checked the history with ":message". I also tried as the help suggests using
set verbose=9, but it never printed out anything related to these autocommands.
Having looked at other SO posts, they mostly are to do with certain file types, there are normally making mistakes with certain file types, however I would like to run a function on all filetypes.
And then to change the path of the file being loaded, I thought I could pass
<afile> into the function, check the path, if its okay, do nothing, if the path needs to be changed then I am unsure how to do either of the follwoing:
- Cancel the current path from opening (so I can just
exe ":e ".new_path) Maybe
- Tell Vim the path of the file its loading has changed.
If anyone has a hint what to look for the above 2 approaches that will be greately appreciated!