Re: batch mode

Re: batch mode

[Pascal Bourguignon]

Sebastian Tennant <sebyte@smolny.plus.com> writes:

> Hi all,
>
> By default Emacs in batch mode sends 'message's to stderr.
>
> Is it possible to put a directive in the file loaded with the '-l'
> switch, that tells Emacs to send 'message's to stdout instead?

Why use message if message doesn't do what you want?  Use print!
(and princ, terpri, etc).

-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

READ THIS BEFORE OPENING PACKAGE: According to certain suggested
versions of the Grand Unified Theory, the primary particles
constituting this product may decay to nothingness within the next
four hundred million years.

Re: batch mode

[Sebastian Tennant]

Quoth Pascal Bourguignon <pjb@informatimago.com>:
> Sebastian Tennant <sebyte@smolny.plus.com> writes:
>
>> Hi all,
>>
>> By default Emacs in batch mode sends 'message's to stderr.
>>
>> Is it possible to put a directive in the file loaded with the '-l'
>> switch, that tells Emacs to send 'message's to stdout instead?
>
> Why use message if message doesn't do what you want?  Use print!
> (and princ, terpri, etc).

It's not my code, and there are a lot of messages in there!

Peter, of course 2>&1 works in a shell, but my guile script calls emacs
directly to avoid the overhead of the shell.

It turns out, guile has good port redirection routines and I'm able to
route stderr programmatically within the script.

Thanks to you both.

Sebastian

Re: batch mode

[Brendan Halpin]

Can I hijack the thread to ask if there is a way of suppressing the
"Loading" and related start-up messages when using the
#!/usr/bin/emacs --script
convention?

At present this:
-------------------------------------------------------------------
#!/usr/bin/emacs --script
(princ "Hello World!\n")
-------------------------------------------------------------------

generates the following output:
-------------------------------------------------------------------
brendan@annacotty:/tmp$ ./hw.el 
Loading 00debian-vars...
Loading /etc/emacs-snapshot/site-start.d/50auctex.el (source)...
Loading /usr/share/emacs/23.0.50/site-lisp/auctex.el (source)...
Loading /usr/share/emacs/23.0.50/site-lisp/preview-latex.el (source)...
Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...
Skipping dictionaries-common setup for emacs-snapshot
Loading /etc/emacs/site-start.d/50gcl.el (source)...
Loading /etc/emacs/site-start.d/50slime.el (source)...
Loading /usr/share/emacs-snapshot/site-lisp/slime/slime-autoloads...
Hello World!
-------------------------------------------------------------------

Adding options like -q and --no-site-file to the bang line don't seem to
have any effect, and this makes Emacs unattractive for small scripts. 

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Suppressing load messages (was: batch mode)

[Joel J. Adamson]

Brendan Halpin <brendan.halpin@ul.ie> writes:

> Can I hijack the thread to ask if there is a way of suppressing the

No, you may not ;)

> "Loading" and related start-up messages when using the
> #!/usr/bin/emacs --script convention?
>
> At present this:
> -------------------------------------------------------------------
> #!/usr/bin/emacs --script
> (princ "Hello World!\n")
> -------------------------------------------------------------------
>
> generates the following output:
> -------------------------------------------------------------------
> brendan@annacotty:/tmp$ ./hw.el 
> Loading 00debian-vars...
> Loading /etc/emacs-snapshot/site-start.d/50auctex.el (source)...
> Loading /usr/share/emacs/23.0.50/site-lisp/auctex.el (source)...
> Loading /usr/share/emacs/23.0.50/site-lisp/preview-latex.el (source)...
> Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...
> Skipping dictionaries-common setup for emacs-snapshot
> Loading /etc/emacs/site-start.d/50gcl.el (source)...
> Loading /etc/emacs/site-start.d/50slime.el (source)...
> Loading /usr/share/emacs-snapshot/site-lisp/slime/slime-autoloads...

This is all STDERR, i.e. the *Messages* buffer.  If you redirect STDERR
or STDOUT, you can suppress the messages, or capture the output in a file.

For example, "hello 2</dev/null"
,----
| 
| /home/joel/lisp/el: ZShell> cat hello.el
| #!/usr/bin/emacs --script
| (message "this is garbage!\n")
| (princ "Hello, Is it me you're looking for?\n")
| 
| /home/joel/lisp/el: ZShell> ./hello.el 
| this is garbage!
| 
| Hello, Is it me you're looking for?
| /home/joel/lisp/el: ZShell> ./hello.el 2</dev/null
| Hello, Is it me you're looking for?
`----

There ya go.

The real question you should be asking is why emacs is loading all that
crap when you're using the --script option.  Who's in charge of your
site-start.el?

> Adding options like -q and --no-site-file to the bang line don't seem to
> have any effect, and this makes Emacs unattractive for small scripts. 

Only if all you want is STDOUT.  If you want to use 'emacs --script' for
non-interactive editing a la sed and awk, then it's perfect: load those
files into buffers, edit them and save them.

Joel

-- 
Joel J. Adamson
Biostatistician
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109

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Re: Suppressing load messages

[Brendan Halpin]

jadamson@partners.org (Joel J. Adamson) writes:

> This is all STDERR, i.e. the *Messages* buffer.  If you redirect STDERR
> or STDOUT, you can suppress the messages, or capture the output in a file.
>
> For example, "hello 2</dev/null"

Yes, but that's not a solution so much as a workaround.

> The real question you should be asking is why emacs is loading all that
> crap when you're using the --script option.  Who's in charge of your
> site-start.el?

Indeed. In practice Debian are in charge, but there's nothing to stop me
changing it -- now all I need is to know (i) how to tell at startup if emacs
is invoked with --script and (ii) how to interfere with the site-start.d
process. 

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Re: Suppressing load messages

[Lennart Borgman (gmail)]

Brendan Halpin wrote:
> Indeed. In practice Debian are in charge, but there's nothing to stop me
> changing it -- now all I need is to know (i) how to tell at startup if emacs
> is invoked with --script and (ii) how to interfere with the site-start.d
> process. 

Excuse me, I did not follow, but do you need to run site-start.el

I tested this:

   C:\test>emacs -Q -batch -l hello.el
   Hello World!

Re: Suppressing load messages

[Joel J. Adamson]

Brendan Halpin <brendan.halpin@ul.ie> writes:

> jadamson@partners.org (Joel J. Adamson) writes:
>
>> This is all STDERR, i.e. the *Messages* buffer.  If you redirect STDERR
>> or STDOUT, you can suppress the messages, or capture the output in a file.
>>
>> For example, "hello 2</dev/null"
>
> Yes, but that's not a solution so much as a workaround.

Well if there can be no arrangement, then we are at an impasse.

>> The real question you should be asking is why emacs is loading all that
>> crap when you're using the --script option.  Who's in charge of your
>> site-start.el?
>
> Indeed. In practice Debian are in charge, but there's nothing to stop me
> changing it -- now all I need is to know (i) how to tell at startup if emacs
> is invoked with --script and (ii) how to interfere with the site-start.d
> process. 

By the above I mean that what you're suggesting sounds like a
workaround, and my workaround sounds like a solution.  Perhaps there's
another way to redirect *Messages* from within Emacs.

You can still redirect your output.  If you don't want that, then
perhaps you need to reconsider why you're using --script.

Like I said if you want to edit files in place, you just open them, edit
them and save them, and STDOUT is incidental; in fact, all you'll get is
STDERR unless your functions have side-effects that call princ.

Joel

-- 
Joel J. Adamson
Biostatistician
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109

The information transmitted in this electronic communication is intended only
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Re: Suppressing load messages

[Brendan Halpin]

jadamson@partners.org (Joel J. Adamson) writes:

> By the above I mean that what you're suggesting sounds like a
> workaround, and my workaround sounds like a solution.  Perhaps there's
> another way to redirect *Messages* from within Emacs.
>
> You can still redirect your output.  If you don't want that, then
> perhaps you need to reconsider why you're using --script.

Indeed. All I want it to use Emacs as a scripting language to write
little utilities, and that they behave just like utilities written in
Perl or Python. 

My thought processes were heading in the direction that the hash-bang
--script option is very new and not yet completely thought through, and
that a long-term solution might lie in hacking the start process.
Perhaps the start process should behave differently when invoked in with
--script. I suspect that completely ignoring the site-start structure
could be suboptimal (if there are site-wide settings that are
non-standard), but it is clearly inappropriate to load lots of
irrelevant files (and not just because of the chatter to STDERR).

It should be acceptable to writers of emacs-script utilities to
explicitly load anything that is needed.

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Re: Suppressing load messages

[Lennart Borgman (gmail)]

> It should be acceptable to writers of emacs-script utilities to
> explicitly load anything that is needed.


It looks like you get a load message if you use load-library, but not if 
you use require:

;; Use this with
;;   emacs -Q -batch -l hello.el
;; to test for load output messages
(unless (featurep 'ido)
   (message "* ido not loaded, will do (require 'ido) now:")
   (require 'ido))
(unless (featurep 'cua-base)
   (message "* cua-base not loaded, will do (load-library \"cua-base\") 
now:")
   (load-library "cua-base"))
(message "\nHello World!")

Re: Suppressing load messages

[Joel J. Adamson]

Brendan Halpin <brendan.halpin@ul.ie> writes:
> but it is clearly inappropriate to load lots of irrelevant files

Yes, they looked like the sort of thing that you should load yourself.
They won't load if you put them in .emacs.  If this is your system, then
I suggest you get that stuff out of site-start.el: why use what the
Debian project put there? ;) If it's not your system, then I suggest you
tell a sysadmin that site-start.el contains a lot of stuff that ought to
be left up to the user.  However, he might get a lot of requests for
those packages...

If you want behavior like Perl or Python (output to STDOUT), then you
should figure out a way to divert STDERR from inside Emacs.  I tried 

(setq shell-command-default-error-buffer "*stderr*")

but that doesn't affect batch mode.

Joel

-- 
Joel J. Adamson
Biostatistician
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109

The information transmitted in this electronic communication is intended only
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Re: Suppressing load messages

[Brendan Halpin]

jadamson@partners.org (Joel J. Adamson) writes:

> If you want behavior like Perl or Python (output to STDOUT), then you
> should figure out a way to divert STDERR from inside Emacs.  I tried 

That's not necessary, since the print family of commands will write to
STDOUT, and it is useful to be able to use message to write to STDERR. 

I think the general problem is that the script facility promotes uses of
Emacs not expected by package writers (and Debian package maintainers). 

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Re: Suppressing load messages

[Joel J. Adamson]

Brendan Halpin <brendan.halpin@ul.ie> writes:

> jadamson@partners.org (Joel J. Adamson) writes:
>
>> If you want behavior like Perl or Python (output to STDOUT), then you
>> should figure out a way to divert STDERR from inside Emacs.  I tried 
>
> That's not necessary, since the print family of commands will write to
> STDOUT, and it is useful to be able to use message to write to STDERR. 

Huh?  Then what do you want?  Do you want to see only STDOUT on the
screen?  Do you want to capture it in a file?

Joel

-- 
Joel J. Adamson
Biostatistician
Pediatric Psychopharmacology Research Unit
Massachusetts General Hospital
Boston, MA  02114
(617) 643-1432
(303) 880-3109

The information transmitted in this electronic communication is intended only
for the person or entity to whom it is addressed and may contain confidential
and/or privileged material. Any review, retransmission, dissemination or other
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entities other than the intended recipient is prohibited. If you received this
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properly dispose of this information.

Re: Suppressing load messages

[Brendan Halpin]

jadamson@partners.org (Joel J. Adamson) writes:

> Brendan Halpin <brendan.halpin@ul.ie> writes:
>
>> jadamson@partners.org (Joel J. Adamson) writes:
>>
>>> If you want behavior like Perl or Python (output to STDOUT), then you
>>> should figure out a way to divert STDERR from inside Emacs.  I tried 
>>
>> That's not necessary, since the print family of commands will write to
>> STDOUT, and it is useful to be able to use message to write to STDERR. 
>
> Huh?  Then what do you want?  Do you want to see only STDOUT on the
> screen?  Do you want to capture it in a file?

I think we're talking at cross purposes. What I'm moaning about is that
there is that even with "--script" there is a lot of unnecessary loading
going on, with the most visible effect of lots of chatter on STDERR.
Simply, that makes Emacs less useful for writing little self-executable
shell utilities. 

What would be nice would be to be able to write hash-bang utilities in
Emacs that behave like any other, with output going to STDOUT and
errors/warnings going to STDERR. We're not quite there yet but it
shouldn't be impossible. Maybe I should talk to the emacs-devel list.

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Re: Suppressing load messages

[Lennart Borgman (gmail)]

Brendan Halpin wrote:
> jadamson@partners.org (Joel J. Adamson) writes:
> 
>> Brendan Halpin <brendan.halpin@ul.ie> writes:
>>
>>> jadamson@partners.org (Joel J. Adamson) writes:
>>>
>>>> If you want behavior like Perl or Python (output to STDOUT), then you
>>>> should figure out a way to divert STDERR from inside Emacs.  I tried 
>>> That's not necessary, since the print family of commands will write to
>>> STDOUT, and it is useful to be able to use message to write to STDERR. 
>> Huh?  Then what do you want?  Do you want to see only STDOUT on the
>> screen?  Do you want to capture it in a file?
> 
> I think we're talking at cross purposes. What I'm moaning about is that
> there is that even with "--script" there is a lot of unnecessary loading
> going on, with the most visible effect of lots of chatter on STDERR.
> Simply, that makes Emacs less useful for writing little self-executable
> shell utilities. 
> 
> What would be nice would be to be able to write hash-bang utilities in
> Emacs that behave like any other, with output going to STDOUT and
> errors/warnings going to STDERR. We're not quite there yet but it
> shouldn't be impossible. Maybe I should talk to the emacs-devel list.

Please do. I have already taken up this issue, but no one has answered yet.

Re: Suppressing load messages

[Brendan Halpin]

"Lennart Borgman (gmail)" <lennart.borgman@gmail.com> writes:

> Excuse me, I did not follow, but do you need to run site-start.el
>
> I tested this:
>
>   C:\test>emacs -Q -batch -l hello.el
>   Hello World!

No, I'm talking about using it to write script files than be invoked
under the shell (bash etc.):

+-------------------------------------------------------------------
|brendan@wivenhoe:/tmp$ cat hw.el
|#! /usr/bin/emacs --script
|(princ "Hello!\n")
|brendan@wivenhoe:/tmp$ chmod +x hw.el
|brendan@wivenhoe:/tmp$ ./hw.el 
|Loading 00debian-vars...
|Loading /etc/emacs/site-start.d/50a2ps.el (source)...
|Loading a2ps-print...
|Loading /etc/emacs-snapshot/site-start.d/50auctex.el (source)...
|Loading /usr/share/emacs/23.0.50/site-lisp/auctex.el (source)...
|Loading /usr/share/emacs/23.0.50/site-lisp/preview-latex.el (source)...
|Loading /etc/emacs/site-start.d/50css-mode.el (source)...
|Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...
|Skipping dictionaries-common setup for emacs-snapshot
|Loading /etc/emacs/site-start.d/50emacs-goodies-el.el (source)...
|Loading /etc/emacs/site-start.d/50html-helper-mode.el (source)...
|Loading /etc/emacs/site-start.d/50slime.el (source)...
|Loading /usr/share/emacs-snapshot/site-lisp/slime/slime-autoloads...
|Hello!
|brendan@wivenhoe:/tmp$ 
+-------------------------------------------------------------------

As you can see, while I do get the output, it also loads a lot of
irrelevant files and generates lots of output to stderr.

The -Q, -batch and -no-site-file arguments aren't accepted on the 
"#! /usr/bin/emacs --script" line. 

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Re: Suppressing load messages

[Exal de Jesus Garcia Carrillo]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Brendan Halpin em gnu.emacs.help escreveu:

> No, I'm talking about using it to write script files than be invoked
> under the shell (bash etc.):
>
> +-------------------------------------------------------------------
> |brendan@wivenhoe:/tmp$ cat hw.el
> |#! /usr/bin/emacs --script
> |(princ "Hello!\n")
> |brendan@wivenhoe:/tmp$ chmod +x hw.el
> |brendan@wivenhoe:/tmp$ ./hw.el 
> |Loading 00debian-vars...
> |Loading /etc/emacs/site-start.d/50a2ps.el (source)...
<snip>



mmm, what emacs version are you running, I get this output:

,----
| exal@frida:~$ cat hello.el 
| #!/home/exal/repos/emacs/src/emacs --script
| (message "Hello world")
| exal@frida:~$ ./hello.el 
| Hello world
| exal@frida:~$
`----


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Re: Suppressing load messages

[Brendan Halpin]

Exal de Jesus Garcia Carrillo <no-spam@gnu.org> writes:

> mmm, what emacs version are you running, I get this output:
>
> ,----
> | exal@frida:~$ cat hello.el 
> | #!/home/exal/repos/emacs/src/emacs --script
> | (message "Hello world")
> | exal@frida:~$ ./hello.el 
> | Hello world
> | exal@frida:~$
> `----
M-x emacs-version gives: 
GNU Emacs 23.0.50.1 (i486-pc-linux-gnu, GTK+ Version 2.12.2)
 of 2007-12-02 on elegiac, modified by Debian

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html

Re: Suppressing load messages

[Exal de Jesus Garcia Carrillo]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Brendan Halpin em gnu.emacs.help escreveu:

> Exal de Jesus Garcia Carrillo <no-spam@gnu.org> writes:
>
>> mmm, what emacs version are you running, I get this output:
>>
>> ,----
>> | exal@frida:~$ cat hello.el 
>> | #!/home/exal/repos/emacs/src/emacs --script
>> | (message "Hello world")
>> | exal@frida:~$ ./hello.el 
>> | Hello world
>> | exal@frida:~$
>> `----
> M-x emacs-version gives: 
> GNU Emacs 23.0.50.1 (i486-pc-linux-gnu, GTK+ Version 2.12.2)
>  of 2007-12-02 on elegiac, modified by Debian



I'm thinking is for the emacs version, I have 
"GNU Emacs 23.0.60.2 (powerpc-unknown-linux-gnu, GTK+ Version 2.10.11) 
of 2008-02-22 on frida"

I ran the same hello.el script with emacs22 and get this:


,----[ emacs22 output ]
| exal@frida:~$ cat hello.el 
| #!/usr/bin/emacs --script
| (message "Hello world")
| exal@frida:~$ ./hello.el 
| Loading 00debian-vars...
| Loading /etc/emacs/site-start.d/50autoconf.el (source)...
| Loading /etc/emacs/site-start.d/50bbdb.el (source)...
| Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...
| Loading debian-ispell...
| Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...
| Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...
| Loading /etc/emacs/site-start.d/50dictionary-el.el (source)...
| Loading dictionary-init...
| Loading /etc/emacs/site-start.d/50erc.el (source)...
| Loading erc-auto...
| Loading /etc/emacs/site-start.d/50festival.el (source)...
| Loading /etc/emacs/site-start.d/50psvn.el (source)...
| Loading /etc/emacs/site-start.d/50slime.el (source)...
| Hello world
| exal@frida:~$ 
`----

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Re: Suppressing load messages

[Lennart Borgman (gmail)]

Brendan Halpin wrote:
> The -Q, -batch and -no-site-file arguments aren't accepted on the 
> "#! /usr/bin/emacs --script" line. 

That looks like a bug to me. Could you please report it as a bug?

Re: Suppressing load messages

[Glenn Morris]

Brendan Halpin wrote:

> The -Q, -batch and -no-site-file arguments aren't accepted on the 
> "#! /usr/bin/emacs --script" line. 

That's an execve issue - you can only have a single argument after the
interpreter on any #! line.

You could always do something like:

#!/bin/sh

/usr/bin/emacs -Q --script <<EOF
...stuff...
EOF

Re: Suppressing load messages

[Glenn Morris]

Glenn Morris wrote:

> /usr/bin/emacs -Q --script <<EOF
> ...stuff...
> EOF

Bah; ignore that (was untested).

Re: Suppressing load messages

[Glenn Morris]

Glenn Morris wrote:

> Glenn Morris wrote:
>
>> /usr/bin/emacs -Q --script <<EOF
>> ...stuff...
>> EOF
>
> Bah; ignore that (was untested).


What will actually work is something like the following. Note you have
to use `-script' not `--script', in all but the very latest CVS, due to a bug.

#!/bin/sh

cat >| foo <<EOF
(message "hi")
EOF

emacs --no-site-file -script foo

Re: Suppressing load messages

[Lennart Borgman (gmail)]

Glenn Morris wrote:
> Brendan Halpin wrote:
> 
>> The -Q, -batch and -no-site-file arguments aren't accepted on the 
>> "#! /usr/bin/emacs --script" line. 
> 
> That's an execve issue - you can only have a single argument after the
> interpreter on any #! line.

In that case should not --script imply -Q?

Re: Suppressing load messages

[Giorgos Keramidas]

On Wed, 12 Mar 2008 16:32:36 -0700, Glenn Morris <rgm+news@stanford.edu> wrote:
> Brendan Halpin wrote:
>
>> The -Q, -batch and -no-site-file arguments aren't accepted on the
>> "#! /usr/bin/emacs --script" line.
>
> That's an execve issue - you can only have a single argument after the
> interpreter on any #! line.

Exactly!

> You could always do something like:
>
> #!/bin/sh
>
> /usr/bin/emacs -Q --script <<EOF
> ...stuff...
> EOF

This lets the shell interpret the Emacs script source.

The following prints nothing here for me:

  #!/bin/sh

  emacs -Q -batch -l /dev/stdin <<EOF
  (let ((var-list (list 'foo$HOME 'bar$LOGNAME)))
    (dolist (var var-list)
      (message "Hello %s" var)))
  EOF

I ended up writing a short shell wrapper, called `emacs-script', like
the following:

    #!/bin/sh
    exec emacs -Q -batch -l "$@"

This lets me write scripts in Elisp by using:

  #!/usr/bin/env emacs-script

  (let ((var-list (list 'foo$HOME 'bar$LOGNAME)))
    (dolist (var var-list)
      (message "Hello %s" var)))

which correctly prints:

  $ ./hw.el
  Hello foo$HOME
  Hello bar$LOGNAME
  $

HTH,
Giorgos

Re: Suppressing load messages

[David Combs]

In article <87zlt39tnn.fsf@kobe.laptop>,
Giorgos Keramidas  <keramida@ceid.upatras.gr> wrote:
>On Wed, 12 Mar 2008 16:32:36 -0700, Glenn Morris <rgm+news@stanford.edu> wrote:
>> Brendan Halpin wrote:
>>
>>> The -Q, -batch and -no-site-file arguments aren't accepted on the
>>> "#! /usr/bin/emacs --script" line.
>>
>> That's an execve issue - you can only have a single argument after the
>> interpreter on any #! line.
>
>Exactly!
>
>> You could always do something like:
>>
>> #!/bin/sh
>>
>> /usr/bin/emacs -Q --script <<EOF
>> ...stuff...
>> EOF
>
>This lets the shell interpret the Emacs script source.
>
>The following prints nothing here for me:
>
>  #!/bin/sh
>
>  emacs -Q -batch -l /dev/stdin <<EOF
>  (let ((var-list (list 'foo$HOME 'bar$LOGNAME)))
>    (dolist (var var-list)
>      (message "Hello %s" var)))
>  EOF
>
>I ended up writing a short shell wrapper, called `emacs-script', like
>the following:
>
>    #!/bin/sh
>    exec emacs -Q -batch -l "$@"
>
>This lets me write scripts in Elisp by using:
>
>  #!/usr/bin/env emacs-script
>
>  (let ((var-list (list 'foo$HOME 'bar$LOGNAME)))
>    (dolist (var var-list)
>      (message "Hello %s" var)))
>
>which correctly prints:
>
>  $ ./hw.el
>  Hello foo$HOME
>  Hello bar$LOGNAME
>  $
>
>HTH,
>Giorgos
>



Looks clever, but I don't really understand it (yet).

Maybe you give a few more details about what you gain (apparantely
a lot) via the shell-wrapper?   Thanks!

Also, if a general technique is what it is, where else might you use
such a thing?


Thanks!

David

Re: Suppressing load messages

[Brendan Halpin]

"Lennart Borgman (gmail)" <lennart.borgman@gmail.com> writes:

> Glenn Morris wrote:
>> Brendan Halpin wrote:
>>
>>> The -Q, -batch and -no-site-file arguments aren't accepted on
>>> the "#! /usr/bin/emacs --script" line. 
>>
>> That's an execve issue - you can only have a single argument after the
>> interpreter on any #! line.
>
> In that case should not --script imply -Q?

That's what I would have thought (to avoid loading packages only
relevant when interactive), but with the proviso that there needs to be
a way to pick up details of a non-standard installation.

Brendan
-- 
Brendan Halpin,  Department of Sociology,  University of Limerick,  Ireland
Tel: w +353-61-213147 f +353-61-202569 h +353-61-338562; Room F2-025 x 3147
mailto:brendan.halpin@ul.ie  http://www.ul.ie/sociology/brendan.halpin.html