Executing bash bash script from emacs / elisp

Executing bash bash script from emacs / elisp

[Rainer M Krug]

Hi
I am a complete beginner concerning elisp - so please bear with me if
this is a simple question.

I would like to execute a shell (bash) script from elisp, which is then
called from org-babel to do some post-processing of the result of
tangling. Tangling in org-babel has a hook for post-processing, and I
know how to set it. Therefore I am simply looking for a way of executing
my shell script from that hook.

essentially:

this-function-executes-a-shell-script(The_Shell_Script.sh)

Thanks,
Rainer

Re: Executing bash bash script from emacs / elisp

[Deniz Dogan]

2010/9/3 Rainer M Krug <R.M.Krug@gmail.com>:
> Hi
> I am a complete beginner concerning elisp - so please bear with me if
> this is a simple question.
>
> I would like to execute a shell (bash) script from elisp, which is then
> called from org-babel to do some post-processing of the result of
> tangling. Tangling in org-babel has a hook for post-processing, and I
> know how to set it. Therefore I am simply looking for a way of executing
> my shell script from that hook.
>
> essentially:
>
> this-function-executes-a-shell-script(The_Shell_Script.sh)
>
> Thanks,
> Rainer
>
>
>

You want to look at the functions `call-process-shell-command' and
`call-process'.

Example:
(call-process-shell-command "the_shell_script.sh" nil nil nil "arg1" "arg2")

That's equivalent to running "the_shell_script.sh arg1 arg" in a shell.

-- 
Deniz Dogan

Re: Executing bash bash script from emacs / elisp

[Rainer M Krug]

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On 03/09/10 13:09, Deniz Dogan wrote:
> 2010/9/3 Rainer M Krug <R.M.Krug@gmail.com>:
>> Hi
>> I am a complete beginner concerning elisp - so please bear with me if
>> this is a simple question.
>>
>> I would like to execute a shell (bash) script from elisp, which is then
>> called from org-babel to do some post-processing of the result of
>> tangling. Tangling in org-babel has a hook for post-processing, and I
>> know how to set it. Therefore I am simply looking for a way of executing
>> my shell script from that hook.
>>
>> essentially:
>>
>> this-function-executes-a-shell-script(The_Shell_Script.sh)
>>
>> Thanks,
>> Rainer
>>
>>
>>
> 
> You want to look at the functions `call-process-shell-command' and
> `call-process'.
> 
> Example:
> (call-process-shell-command "the_shell_script.sh" nil nil nil "arg1" "arg2")
> 
> That's equivalent to running "the_shell_script.sh arg1 arg" in a shell.
> 

Thanks a lot. After looking around I also found async-shell-command and
shell-command. Am I right in assuming that, as the script is not
producing any output, these commands are equivalent?

In addition, when using async-shell-command I get asked "A command is
running. Kill it? (yes or no)"
Is there any way to avoid this?

Cheers,

Rainer


- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Natural Sciences Building
Office Suite 2039
Stellenbosch University
Main Campus, Merriman Avenue
Stellenbosch
South Africa

Tel:        +33 - (0)9 53 10 27 44
Cell:       +27 - (0)8 39 47 90 42
Fax (SA):   +27 - (0)8 65 16 27 82
Fax (D) :   +49 - (0)3 21 21 25 22 44
Fax (FR):   +33 - (0)9 58 10 27 44
email:      Rainer@krugs.de

Skype:      RMkrug
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Re: Executing bash bash script from emacs / elisp

[Deniz Dogan]

2010/9/3 Rainer M Krug <r.m.krug@gmail.com>:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 03/09/10 13:09, Deniz Dogan wrote:
>> 2010/9/3 Rainer M Krug <R.M.Krug@gmail.com>:
>>> Hi
>>> I am a complete beginner concerning elisp - so please bear with me if
>>> this is a simple question.
>>>
>>> I would like to execute a shell (bash) script from elisp, which is then
>>> called from org-babel to do some post-processing of the result of
>>> tangling. Tangling in org-babel has a hook for post-processing, and I
>>> know how to set it. Therefore I am simply looking for a way of executing
>>> my shell script from that hook.
>>>
>>> essentially:
>>>
>>> this-function-executes-a-shell-script(The_Shell_Script.sh)
>>>
>>> Thanks,
>>> Rainer
>>>
>>>
>>>
>>
>> You want to look at the functions `call-process-shell-command' and
>> `call-process'.
>>
>> Example:
>> (call-process-shell-command "the_shell_script.sh" nil nil nil "arg1" "arg2")
>>
>> That's equivalent to running "the_shell_script.sh arg1 arg" in a shell.
>>
>
> Thanks a lot. After looking around I also found async-shell-command and
> shell-command. Am I right in assuming that, as the script is not
> producing any output, these commands are equivalent?
>

Those two functions are interactive, i.e. they can be called by the
user directly using e.g. M-x shell-command. Nothing stops you from
using them, but they both basically just wrap call-process in a bunch
of user interaction handling.

> In addition, when using async-shell-command I get asked "A command is
> running. Kill it? (yes or no)"
> Is there any way to avoid this?
>

Yes, it should be enough to simply set the OUTPUT-BUFFER argument to
nil to tell Emacs not to print the output anywhere, hence not creating
a buffer for the process.

-- 
Deniz Dogan

Re: Executing bash bash script from emacs / elisp

[Memnon Anon]

Hi,

Rainer M Krug <R.M.Krug@gmail.com> writes:

> essentially:
> this-function-executes-a-shell-script(The_Shell_Script.sh)

 -- Function: call-process program &optional infile destination display
 -- Function: call-process-shell-command command &optional infile
 -- Function: start-process name buffer-or-name program &rest args
 -- Function: start-process-shell-command name buffer-or-name command

Have a look at [ (info "(elisp)Processes") ].

Did that help?

Memnon

Re: Executing bash bash script from emacs / elisp

[Pascal J. Bourguignon]

Rainer M Krug <R.M.Krug@gmail.com> writes:
> I am a complete beginner concerning elisp - so please bear with me if
> this is a simple question.
>
> I would like to execute a shell (bash) script from elisp, which is then
> called from org-babel to do some post-processing of the result of
> tangling. Tangling in org-babel has a hook for post-processing, and I
> know how to set it. Therefore I am simply looking for a way of executing
> my shell script from that hook.
>
> essentially:
>
> this-function-executes-a-shell-script(The_Shell_Script.sh)

The problem is that hook functions are called with no argument, and
should modify the environment (the current buffer or whatever else
they want to modify).

Another problem is that buffers are more than just a sequence of
character: there are text annotation, properties, markers, etc.

In any case the scheme would be to write a hook function that would
gather all the information you want to send to the script, and to
serialize it into a temporary file or a temporary buffer, and to run
the shell script.  Then collect the output of the shell script, and
deserialize it into modifications to the environment.


Hooks in org-babel-post-tangle-hook are called on a temporary buffer,
assuming you only want to process the characters and replace the
contents of that temporary buffer, you could use
shell-command-on-region to filter them.


(require 'cl)

(defun wrap-hook (shell-script)
  (lexical-let ((shell-script shell-script))
    (lambda ()
        (shell-command-on-region (point-min) (point-max)
                                 shell-script
                                 t t "*errors*" t))))

(add-hook -example-hook  (wrap-hook "ls"))


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

Re: Executing bash bash script from emacs / elisp

[Rainer M Krug]

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On 03/09/10 13:42, Deniz Dogan wrote:
> 2010/9/3 Rainer M Krug <r.m.krug@gmail.com>:
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> On 03/09/10 13:09, Deniz Dogan wrote:
>>> 2010/9/3 Rainer M Krug <R.M.Krug@gmail.com>:
>>>> Hi
>>>> I am a complete beginner concerning elisp - so please bear with me if
>>>> this is a simple question.
>>>>
>>>> I would like to execute a shell (bash) script from elisp, which is then
>>>> called from org-babel to do some post-processing of the result of
>>>> tangling. Tangling in org-babel has a hook for post-processing, and I
>>>> know how to set it. Therefore I am simply looking for a way of executing
>>>> my shell script from that hook.
>>>>
>>>> essentially:
>>>>
>>>> this-function-executes-a-shell-script(The_Shell_Script.sh)
>>>>
>>>> Thanks,
>>>> Rainer
>>>>
>>>>
>>>>
>>>
>>> You want to look at the functions `call-process-shell-command' and
>>> `call-process'.
>>>
>>> Example:
>>> (call-process-shell-command "the_shell_script.sh" nil nil nil "arg1" "arg2")
>>>
>>> That's equivalent to running "the_shell_script.sh arg1 arg" in a shell.
>>>
>>
>> Thanks a lot. After looking around I also found async-shell-command and
>> shell-command. Am I right in assuming that, as the script is not
>> producing any output, these commands are equivalent?
>>

Dear Mannon and Deniz

Thanks a lot for your input.

> 
> Those two functions are interactive, i.e. they can be called by the
> user directly using e.g. M-x shell-command. Nothing stops you from
> using them, but they both basically just wrap call-process in a bunch
> of user interaction handling.

OK - I understand

> 
>> In addition, when using async-shell-command I get asked "A command is
>> running. Kill it? (yes or no)"
>> Is there any way to avoid this?
>>
> 
> Yes, it should be enough to simply set the OUTPUT-BUFFER argument to
> nil to tell Emacs not to print the output anywhere, hence not creating
> a buffer for the process.
> 

Thanks - I am using call-process-shell-command and if I set the BUFFER
to 0, it backgrounds as I want it

Cheers,

Rainer

- -- 
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Natural Sciences Building
Office Suite 2039
Stellenbosch University
Main Campus, Merriman Avenue
Stellenbosch
South Africa

Tel:        +33 - (0)9 53 10 27 44
Cell:       +27 - (0)8 39 47 90 42
Fax (SA):   +27 - (0)8 65 16 27 82
Fax (D) :   +49 - (0)3 21 21 25 22 44
Fax (FR):   +33 - (0)9 58 10 27 44
email:      Rainer@krugs.de

Skype:      RMkrug
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