I found this really cool in emacs

M-! t

t is ~/bin/t, and runs tests for whatever thing I'm working on. I added ~/bin/ to my /etc/path.d/, and I always use emacs -nw.

My issue is, the command output is not displayed properly in Emacs.

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Newlines are messed up, and there's a ^M shown in the screen.

How can I tell M-! command to give me a more realistic view of the output, as if it was typed in a true bash terminal

  • 1
    I removed the emacs25 tag. Please do not use irrelevant tags in your posts.
    – Dan
    Dec 19 '17 at 15:20
  • What @Dan said. I've removed the same tag several times now. And elisp, which is about the language itself, not about how to do XYZ in Elisp.
    – Drew
    Dec 19 '17 at 15:28
  • I think you have to use a custom shell process to get all escape sequences and apply colors correctly. But I think ansi-colors.el is broken. However I do know that the package xterm-color is working.
    – bertfred
    Dec 19 '17 at 15:29
  • thanks for mentioning xterm-color, so how do I use it? Dec 19 '17 at 15:58
  • The shell command functionality provides only a dumb terminal, so "as if it was typed in a true bash terminal" is very different. You might want to update your test script to support dumb terminals; or you could try using the term.el process filter term-emulate-terminal.
    – phils
    Mar 19 '18 at 22:05

Something like this

(defun my-shell-process ()
  (let ((buf "my-shell-process")
        (coding-system-for-read 'binary)
        (process-environment (nconc
                              (list (format "TERM=%s" "notdumb"))
    (start-process "my-shell-process"
    (let ((proc (get-buffer-process buf)))
      (set-process-filter proc 'my-filter)
      (accept-process-output proc 0.1))))

(defun my-filter (proc output)
  (let ((buf (process-buffer proc)))
    (with-current-buffer buf
      (goto-char (point-max))
      (setq truncate-lines t)
      (insert (xterm-color-filter output)))))

You need to send a command to the process this way (process-send-string "my-shell-process" "ls -la\n")

  • is my use case so niche that emacs doesn't have a package or builtin for this? Dec 20 '17 at 1:31
  • Maybe there is a package for this, but I doubt it.
    – bertfred
    Dec 20 '17 at 6:31

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