How to map a key for a specific file

Question

We can use the FileType autocommand event to create a customized key mapping for a specific type of file. For example, Spaceb could call different build tools for a Java file compared to a C++ file.

I wonder is there any way to create a customized key mapping for a specific file?

Answer 1

You can use the BufRead event in combination with a buffer-local mapping. For example, if I want o in Normal mode to echo Math is rad only when I'm editing a file named foo.bar:

autocmd BufRead foo.bar nnoremap <buffer> o :echo "Math is rad"<CR>

See:

:h autocmd-events
:h BufRead
:h autocmd-patterns
:h map-local