Re: Process filters — line at a time?

[Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

> Thank you, string-lines sounds helpful. In the case that there an incomplete
> line at the end, is there some way to give that back to the process output
> stream, or would I need to buffer that myself?

The usual way to do that is to keep the "unprocessed output" in
a process property (see `process-put` and `process-get`) or in a global
var, e.g.:

    (lambda (proc output)
      (setq output (concat (process-get proc 'foo--leftover) output))
      (let ((end (string-match ".*\\'" output)))
        (process-put proc 'foo--leftover (substring output end))
        (setq output (substring output 0 end)))
      ;; Now `output` contains only wholelines.
      ...)


- Stefan