* compile mode and $EMACS
@ 2013-08-10 16:47 Sebastian Wiesner
2013-08-10 22:38 ` Xue Fuqiao
2013-08-11 12:28 ` Pascal J. Bourguignon
0 siblings, 2 replies; 6+ messages in thread
From: Sebastian Wiesner @ 2013-08-10 16:47 UTC (permalink / raw)
To: emacs-devel
Hello,
I just discovered that compile mode adds "EMACS=t" to the process
environment (see "compilation-start").
What is this variable for? How is it supposed to be interpreted by
the invoked program? Which programs do actually use it?
Greetings
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: compile mode and $EMACS
2013-08-10 16:47 compile mode and $EMACS Sebastian Wiesner
@ 2013-08-10 22:38 ` Xue Fuqiao
2013-08-11 10:39 ` Sebastian Wiesner
2013-08-11 12:28 ` Pascal J. Bourguignon
1 sibling, 1 reply; 6+ messages in thread
From: Xue Fuqiao @ 2013-08-10 22:38 UTC (permalink / raw)
To: Sebastian Wiesner; +Cc: emacs-devel
On Sun, Aug 11, 2013 at 12:47 AM, Sebastian Wiesner <lunaryorn@gmail.com> wrote:
> Hello,
>
> I just discovered that compile mode adds "EMACS=t" to the process
> environment (see "compilation-start").
>
> What is this variable for? How is it supposed to be interpreted by
> the invoked program? Which programs do actually use it?
In (info "(emacs) Interactive Shell"):
Emacs sets the environment variable `INSIDE_EMACS' in the subshell
to `VERSION,comint', where VERSION is the Emacs version (e.g., `24.1').
Programs can check this variable to determine whether they are running
inside an Emacs subshell. (It also sets the `EMACS' environment
variable to `t', if that environment variable is not already defined.
However, this environment variable is deprecated; programs that use it
should switch to using `INSIDE_EMACS' instead.)
--
Best regards, Xue Fuqiao.
http://www.gnu.org/software/emacs/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: compile mode and $EMACS
2013-08-10 22:38 ` Xue Fuqiao
@ 2013-08-11 10:39 ` Sebastian Wiesner
0 siblings, 0 replies; 6+ messages in thread
From: Sebastian Wiesner @ 2013-08-11 10:39 UTC (permalink / raw)
To: Xue Fuqiao; +Cc: emacs-devel
2013/8/11 Xue Fuqiao <xfq.free@gmail.com>:
> On Sun, Aug 11, 2013 at 12:47 AM, Sebastian Wiesner <lunaryorn@gmail.com> wrote:
>> Hello,
>>
>> I just discovered that compile mode adds "EMACS=t" to the process
>> environment (see "compilation-start").
>>
>> What is this variable for? How is it supposed to be interpreted by
>> the invoked program? Which programs do actually use it?
>
> In (info "(emacs) Interactive Shell"):
Thank you.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: compile mode and $EMACS
2013-08-10 16:47 compile mode and $EMACS Sebastian Wiesner
2013-08-10 22:38 ` Xue Fuqiao
@ 2013-08-11 12:28 ` Pascal J. Bourguignon
2013-08-11 12:42 ` Sebastian Wiesner
1 sibling, 1 reply; 6+ messages in thread
From: Pascal J. Bourguignon @ 2013-08-11 12:28 UTC (permalink / raw)
To: emacs-devel
Sebastian Wiesner <lunaryorn@gmail.com> writes:
> Hello,
>
> I just discovered that compile mode adds "EMACS=t" to the process
> environment (see "compilation-start").
>
> […] How is it supposed to be interpreted by the invoked program? […]
Some compilers may have different error message output formats depending
on whether they're run INSIDE_EMACS or not.
For example, ant has the -e option to output emacs friendly formatted
error messages.
(Of course, emacs can also adapt itself to the various compiler error
message output formats, cf. C-h v compilation-error-regexp-alist)
--
__Pascal Bourguignon__
http://www.informatimago.com/
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: compile mode and $EMACS
2013-08-11 12:28 ` Pascal J. Bourguignon
@ 2013-08-11 12:42 ` Sebastian Wiesner
2013-08-11 13:06 ` Andreas Schwab
0 siblings, 1 reply; 6+ messages in thread
From: Sebastian Wiesner @ 2013-08-11 12:42 UTC (permalink / raw)
To: Pascal J. Bourguignon; +Cc: emacs-devel
2013/8/11 Pascal J. Bourguignon <pjb@informatimago.com>:
> Sebastian Wiesner <lunaryorn@gmail.com> writes:
>
>> Hello,
>>
>> I just discovered that compile mode adds "EMACS=t" to the process
>> environment (see "compilation-start").
>>
>> […] How is it supposed to be interpreted by the invoked program? […]
>
> Some compilers may have different error message output formats depending
> on whether they're run INSIDE_EMACS or not.
Which ones? Can you name *concrete* examples?
> For example, ant has the -e option to output emacs friendly formatted
> error messages.
Yes, uhm, that's an explicit option to enable Emacs-friendly
formatting. Many tools have those. But I see no $EMACS variable
involved here…
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: compile mode and $EMACS
2013-08-11 12:42 ` Sebastian Wiesner
@ 2013-08-11 13:06 ` Andreas Schwab
0 siblings, 0 replies; 6+ messages in thread
From: Andreas Schwab @ 2013-08-11 13:06 UTC (permalink / raw)
To: Sebastian Wiesner; +Cc: Pascal J. Bourguignon, emacs-devel
Sebastian Wiesner <lunaryorn@gmail.com> writes:
> Which ones? Can you name *concrete* examples?
bash:
/*
* M-x term -> TERM=eterm EMACS=22.1 (term:0.96) (eterm)
* M-x shell -> TERM=dumb EMACS=t (no line editing)
* M-x terminal -> TERM=emacs-em7955 EMACS= (line editing)
*/
if (interactive_shell)
{
char *term, *emacs;
term = get_string_value ("TERM");
emacs = get_string_value ("EMACS");
/* Not sure any emacs terminal emulator sets TERM=emacs any more */
no_line_editing |= term && (STREQ (term, "emacs"));
no_line_editing |= emacs && emacs[0] == 't' && emacs[1] == '\0' && STREQ (term, "dumb");
/* running_under_emacs == 2 for `eterm' */
running_under_emacs = (emacs != 0) || (term && STREQN (term, "emacs", 5));
running_under_emacs += term && STREQN (term, "eterm", 5) && emacs && strstr (emacs, "term");
if (running_under_emacs)
gnu_error_format = 1;
}
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 6+ messages in thread
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2013-08-10 16:47 compile mode and $EMACS Sebastian Wiesner
2013-08-10 22:38 ` Xue Fuqiao
2013-08-11 10:39 ` Sebastian Wiesner
2013-08-11 12:28 ` Pascal J. Bourguignon
2013-08-11 12:42 ` Sebastian Wiesner
2013-08-11 13:06 ` Andreas Schwab
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