doom-emacs/core/autoload/process.el

;;; core/autoload/process.el -*- lexical-binding: t; -*-

;;;###autoload
(defun doom-call-process (command &rest args)
  "Execute COMMAND with ARGS synchronously.

Returns (STATUS . OUTPUT) when it is done, where STATUS is the returned error
code of the process and OUTPUT is its stdout output."
  (with-temp-buffer
    (cons (or (apply #'call-process command nil t nil (remq nil args))
              -1)
          (string-trim (buffer-string)))))

;;;###autoload
(defun doom-exec-process (command &rest args)
  "Execute COMMAND with ARGS synchronously.

Unlike `doom-call-process', this pipes output to `standard-output' on the fly to
simulate 'exec' in the shell, so batch scripts could run external programs
synchronously without sacrificing their output.

Warning: freezes indefinitely on any stdin prompt."
  ;; FIXME Is there any way to handle prompts?
  (with-temp-buffer
    (cons (let ((process
                 (make-process :name "doom-sh"
                               :buffer (current-buffer)
                               :command (cons command (remq nil args))
                               :connection-type 'pipe))
                done-p)
            (set-process-filter
             process (lambda (_process output)
                       (princ output (current-buffer))
                       (princ (doom--format output))))
            (set-process-sentinel
             process (lambda (process _event)
                       (when (memq (process-status process) '(exit stop))
                         (setq done-p t))))
            (while (not done-p)
              (sit-for 0.1))
            (process-exit-status process))
          (string-trim (buffer-string)))))