filetype of the run/debug window

[winkee01]

When I press :RustRun, it opens up debug window, but it does not have a filetype, which cause a bit of problem for status line display and other operations I may hook to a filetype.

My question is, can you set a filetype for it? or is there anyway I can set a filetype detection for it.

[ehaynes99]

This could be done in executors/termopen.lua like:

index 781f5f4..c68b282 100644
--- a/lua/rust-tools/executors/termopen.lua
+++ b/lua/rust-tools/executors/termopen.lua
@@ -16,6 +16,7 @@ function M.execute_command(command, args, cwd)

   -- create the new buffer
   latest_buf_id = vim.api.nvim_create_buf(false, true)
+  vim.bo[latest_buf_id].filetype = 'rustrunnable'

   -- split the window to create a new buffer and set it to our window
   utils.split(false, latest_buf_id)

There is also a toggleterm implementation in there, but honestly I'm not sure if/how it gets used. Toggleterm sets its own filetype to toggleterm, however (that might be broken, as this comparison is wrong: https://github.com/akinsho/toggleterm.nvim/blob/b02a1674bd0010d7982b056fd3df4f717ff8a57a/lua/toggleterm.lua#L102)

[ehaynes99]

Honestly, looking at it a bit more, you should probably plan for things to not have a filetype. I think it'll be quite common that buffers that are not files are going to be missing it. You could hack around it with something like:

vim.api.nvim_create_autocmd('TermOpen', {
  callback = function(args)
    if vim.bo[args.buf].filetype == '' then
      vim.api.nvim_buf_set_option(args.buf, 'filetype', 'terminal')
    end
  end
})

Or if you really want it for this specific thing, something like this will work. There's nothing uniquely identifiable other than the fact that (at least currently), all of the commands fired here will contain && cargo in them, but it's a really flimsy way of detecting the source.

vim.api.nvim_create_autocmd('TermOpen', {
  pattern = '*&& cargo*',
  callback = function(args)
    if vim.bo[args.buf].filetype == '' then
      vim.api.nvim_buf_set_option(args.buf, 'filetype', 'rustrunnable')
    end
  end
})