Re: Feature request: Expose system `exec` as a built-in elisp function

[Kevin Rodgers]

On 8/13/14 3:42 PM, Andrew Pennebaker wrote:
> Eh, what if you don't want the second emacs call to use the same emacs
> configuration, etc. etc. as the parent emacs process?

Pass -Q on the command line.  Here's what I use to fork a new instance via `M-x
run-emacs RET':

(defun run-emacs (command)
  "Run the Emacs COMMAND in the background via `shell-command'."
  (interactive
   (let ((program (expand-file-name invocation-name invocation-directory)))
     (list (read-string "Emacs command: "
                        (cons (concat program
                                      " "
                                      (if (cdr command-line-args)
                                          (mapconcat 'shell-quote-argument
                                                     (cdr command-line-args)
                                                     " ")
                                        "-Q")
                                      " &")
                              (1+ (length program)))))))
  (shell-command command))

> Feel free to ask the cask project for more details:
>
> https://github.com/cask/cask
>
>
>
> On Wed, Aug 13, 2014 at 3:36 PM, Barry Margolin <barmar@alum.mit.edu> wrote:
>
> > In article <mailman.7068.1407955728.1147.help-gnu-emacs@gnu.org>,
> >   Andrew Pennebaker <andrew.pennebaker@gmail.com> wrote:
> >
> > > One example of the worthiness of exec is cask, an Emacs package manager
> > > that sometimes wants to fork out to an emacs instance, for editing text
> > > files.
> >
> > I'm not familiar with cask, but usually if you run something within
> > Emacs, and it wants you to edit something, you set EDITOR=emacsclient so
> > that it goes back to the original Emacs instance. You don't need to
> > start a new Emacs instance.
> >
> > And that still doesn't explain why you would want to kill the original
> > Emacs instance when running cask.
> >
> > --
> > Barry Margolin, barmar@alum.mit.edu
> > Arlington, MA
> > *** PLEASE post questions in newsgroups, not directly to me ***

--
Kevin Rodgers
Denver, Colorado, USA