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And use it for key mapping like so:

map("", "<Leader>f", ":CocCommand prettier.forceFormatDocument<CR>") 
map("", "<Leader>f", ":RustFmt<CR>")
I want to use :RustFmt only for .rs files and :CocCommand prettier.forceFormatDocument for all the other files.
Is this possible to do with vim.api.nvim_set_keymap and if so how could I do it?
                @DoktorOSwaldo , not quite. The docs on nvim_set_keymap says it's option can not accept <buffer>. neovim.io/doc/user/api.html#nvim_set_keymap()
– Slava.In
                Jul 14, 2022 at 19:40
                @Slava.In, Sorry I removed the flag, but the comment stays. I saw that it is not the same. But the question has be answered multiple times. There are two ways. You can use a filetype specific autocmd or, in my opinion better, use the ftplugin directory as unrealapex said.
– Doktor OSwaldo
                Jul 15, 2022 at 5:08
                I would like to know how to add the filename local filename = vim.api.nvim_buf_get_name(0):gsub('^.*/', '') at the beginning of the description: ` { desc = "string" }` so I that I can debug my mappings, differentiating them from other mappings.
– SergioAraujo
                Jul 27, 2022 at 20:37
Thanks to @DoktorOSwaldo and @UnrealApex I was able to resolve the issue using ftplugin.
Steps:
Create ftplugin directory inside ~/.config/nvim.
Inside ftplugin directory create a file rust.lua.
Inside rust.lua import map util and define key mapping.
local map = require("utils").map
-- Format document
map("", "<Leader>f", ":RustFmt<CR>")
For languages other than Rust use the following command to get the full list of possible file names (.vim can be switched to .lua):
:exe 'Lexplore ' . expand('$VIMRUNTIME') . '/syntax'
You can create a format function in your utils.lua configuration file :
function M.format()
  if vim.bo.filetype == 'rust' then
    vim.cmd('RustFmt')
    vim.cmd('CocCommand prettier.forceFormatDocument')
and define your key mapping like this :
map("", "<Leader>f", "<cmd>:lua require('utils').format<CR>")
                See the complete code un the first post, code return M as table (standard structure for a Neovim plugin in Lua).
– lcheylus
                Apr 12 at 15:56
        
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