I am working a lot with buf and have it also setup to work from inside Neovim and it would make life a bit more convenient if both buf lint and buf format would accept input from stdin.

It would allow to show diagnostics live and on unsaved buffers and have a better integration with the vim.lsp.buf.formatting() functions as used in null-ls.

Currently, this means that all changes are "undone" when running the formatting command on unsaved buffers as they revert back to what's on disc. Which happens a lot for me since I usually setup formatting like this

vim.cmd([[autocmd BufWritePre <buffer> lua vim.lsp.buf.formatting_sync(nil, 500)]])

which runs the formatting on the unsaved buffer before writing the buffer to disc every time I save a file.

Maybe by adding an option --stdin or detecting when something gets piped in would be an option?