Re: path, cwd in NS port

[조성빈]

> On May 29, 2020, at 1:33 AM, Perry E. Metzger <perry@piermont.com> wrote:
> 
> On Thu, 28 May 2020 19:10:43 +0300 Eli Zaretskii <eliz@gnu.org> wrote:
>>> Date: Thu, 28 May 2020 11:00:37 -0400
>>> From: "Perry E. Metzger" <perry@piermont.com>
>>> 
>>> Howdy! For years, it has irritated me a bit that when Emacs is
>>> invoked by double-clicking the icon in the NS port, that the
>>> user's path is basically empty and the selected cwd is sometimes
>>> "/".
>>> 
>>> I would like to make it possible for a user to at least correct
>>> this situation in their .emacs by knowing when Emacs has been
>>> invoked by launching the .app versus when it has been invoked
>>> from the command line (and has the proper PATH set etc.)
>>> 
>>> Does anyone have ideas for ways that the user could figure out
>>> which it is correctly inside their init file? (It's okay if the
>>> method doesn't currently exist and it would require hacking to
>>> Emacs to add such a feature; I'll happily do that.)  
>> 
>> Is this the same problem as discussed in bug#40924?  (I don't use
>> macOS, so apologies if I;m confused about this issue.)
> 
> It's certainly a version of the same issue; something happened such
> that the default CWD is no longer set to ~/ recently. That should be
> fixed independently if anyone knows what changed. (I've noticed this
> issue myself and it is quite irritating.)
> 
> However, the user's PATH has always been non-optimal on invocation
> from the dock, spotlight, clicking in the Applications directory, etc.
> If the thing invoking Emacs doesn't already have the user's PATH in
> its environment, it can't pass it to Emacs, and it would be nice for
> Emacs users to have an easy solution to fix this.

Actually, I didn’t mention this in that thread but (as a macOS user) I’m not 
sure if Emacs having the shell env vars is expected behavior: I think most 
people would expect it to have the PATH as defined in /etc/paths and 
/etc/paths.d (as all GUI programs). 

> I imagine such problems will also exist in some Linux window managers
> etc. as well.

Linux has the concept of the login shell, which means that the .profile (or 
whatever login shell init file is) gets executed and the environment persists 
during computer use — that’s why the environment is inherited. In macOS that’s 
not the case, and it’s rather unexpected to have the shell variables.

I’m not sure how to reliably get the env-vars as well, too. AFAIK 
exec-path-with-shell requires the shell to be a POSIXy one — something that is 
usually true to not be a problem in practice as a package, but it won’t work if 
the user uses e.g. powershell as the default shellZ

> This issue was brought up on the list only a week or two ago I
> believe. I've started poking and prodding at it.
> 
> One option that occurred to me was that it would be pretty easy to
> invoke an "echo $PATH" shell command in my .emacs and parse it into
> the exec-path, though I'd prefer only to do this if Emacs was invoked
> a certain way (from the dock, spotlight, etc.) where the PATH is
> known not to be set. 
> 
> Perry
> -- 
> Perry E. Metzger        perry@piermont.com
>