running function in hook dependent on value of a variable

running function in hook dependent on value of a variable

[Rainer M Krug]

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Hi

I want to run a function in a hook only if the value of a variable is
non-nil. I have gotten that far with my less then rudimentary lisp knowledge:

,----
| (defvar org-babel-tangle-run-postTangleScript nil
|   "If non-nil, postTangleScript.sh will be executed")
| (put 'org-babel-tangle-run-postTangleScript 'safe-local-variable 'booleanp)
| 
| (defun org-babel-run-post-tangle-script ()
|   (if org-babel-tangle-run-postTangleScript
|       (	(message "running the postTangleScript.sh bash shell script")
| 	(shell-command "bash ./postTangleScript.sh"))))
| 
| (add-hook 'org-babel-post-tangle-hook 'org-babel-run-post-tangle-script)
`----

But something is wrong with the function, as it does not work. 

Any suggestions?

The idea is to be able to enable and disable the execution of this
postTangleScript.sh file on a per-file-basis using file-local-variables.

Ultimately, I would like to be able to execute a script whose name is
stored in the variable org-babel-tangle-run-postTangleScript and not
hardcoded. 

Also, if the variable and the function should follow a certain naming
convention, please let me know.

Thanks,

Rainer

-- 
Rainer M. Krug

email: RMKrug<at>gmail<dot>com

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Re: running function in hook dependent on value of a variable

[Kevin Rodgers]

On 6/13/13 8:26 AM, Rainer M Krug wrote:
> Hi
>
> I want to run a function in a hook only if the value of a variable is
> non-nil. I have gotten that far with my less then rudimentary lisp knowledge:
>
> ,----
> | (defvar org-babel-tangle-run-postTangleScript nil
> |   "If non-nil, postTangleScript.sh will be executed")
> | (put 'org-babel-tangle-run-postTangleScript 'safe-local-variable 'booleanp)
> |
> | (defun org-babel-run-post-tangle-script ()
> |   (if org-babel-tangle-run-postTangleScript
> |       (	(message "running the postTangleScript.sh bash shell script")
> | 	(shell-command "bash ./postTangleScript.sh"))))
> |
> | (add-hook 'org-babel-post-tangle-hook 'org-babel-run-post-tangle-script)
> `----
>
> But something is wrong with the function, as it does not work.

The THEN clause of the `if' special form is a single expression, but you have
a list of expressions: ((message ...) (shell-command ...))

> Any suggestions?

(defun org-babel-run-post-tangle-script ()
   (if org-babel-tangle-run-postTangleScript
       (progn
	(message "running the postTangleScript.sh bash shell script")
	(shell-command "bash ./postTangleScript.sh"))))

Or for old-school Lisp minimalists:

(defun org-babel-run-post-tangle-script ()
   (and org-babel-tangle-run-postTangleScript
        (messagea "running the postTangleScript.sh bash shell script")
        (shell-command "bash ./postTangleScript.sh")))

Or for CLtL style aficianados like myself:

(defun org-babel-run-post-tangle-script ()
   (when org-babel-tangle-run-postTangleScript
     (message "running the postTangleScript.sh bash shell script")
     (shell-command "bash ./postTangleScript.sh")))

-- 
Kevin Rodgers
Denver, Colorado, USA

Re: running function in hook dependent on value of a variable

[Rainer M Krug]

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Kevin Rodgers <kevin.d.rodgers@gmail.com> writes:

> On 6/13/13 8:26 AM, Rainer M Krug wrote:
>> Hi
>>
>> I want to run a function in a hook only if the value of a variable is
>> non-nil. I have gotten that far with my less then rudimentary lisp knowledge:
>>
>> ,----
>> | (defvar org-babel-tangle-run-postTangleScript nil
>> |   "If non-nil, postTangleScript.sh will be executed")
>> | (put 'org-babel-tangle-run-postTangleScript 'safe-local-variable 'booleanp)
>> |
>> | (defun org-babel-run-post-tangle-script ()
>> |   (if org-babel-tangle-run-postTangleScript
>> |       (	(message "running the postTangleScript.sh bash shell script")
>> | 	(shell-command "bash ./postTangleScript.sh"))))
>> |
>> | (add-hook 'org-babel-post-tangle-hook 'org-babel-run-post-tangle-script)
>> `----
>>
>> But something is wrong with the function, as it does not work.
>
> The THEN clause of the `if' special form is a single expression, but you have
> a list of expressions: ((message ...) (shell-command ...))

Ah - makes sens now.

>
>> Any suggestions?
>
> (defun org-babel-run-post-tangle-script ()
>   (if org-babel-tangle-run-postTangleScript
>       (progn
> 	(message "running the postTangleScript.sh bash shell script")
> 	(shell-command "bash ./postTangleScript.sh"))))
>
> Or for old-school Lisp minimalists:
>
> (defun org-babel-run-post-tangle-script ()
>   (and org-babel-tangle-run-postTangleScript
>        (messagea "running the postTangleScript.sh bash shell script")
>        (shell-command "bash ./postTangleScript.sh")))
>
> Or for CLtL style aficianados like myself:
>
> (defun org-babel-run-post-tangle-script ()
>   (when org-babel-tangle-run-postTangleScript
>     (message "running the postTangleScript.sh bash shell script")
>     (shell-command "bash ./postTangleScript.sh")))

Thanks - I finally understood something more about (e)lisp.

I agree - the last one looks the most intuitive to me.

Thanks,

Rainer


-- 
Rainer M. Krug

email: RMKrug<at>gmail<dot>com

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Re: running function in hook dependent on value of a variable

[Barry Margolin]

In article <mailman.1558.1371133630.22516.help-gnu-emacs@gnu.org>,
 Rainer M Krug <Rainer@krugs.de> wrote:

> Hi
> 
> I want to run a function in a hook only if the value of a variable is
> non-nil. I have gotten that far with my less then rudimentary lisp knowledge:
> 
> ,----
> | (defvar org-babel-tangle-run-postTangleScript nil
> |   "If non-nil, postTangleScript.sh will be executed")
> | (put 'org-babel-tangle-run-postTangleScript 'safe-local-variable 'booleanp)
> | 
> | (defun org-babel-run-post-tangle-script ()
> |   (if org-babel-tangle-run-postTangleScript
> |       (	(message "running the postTangleScript.sh bash shell script")
> | 	(shell-command "bash ./postTangleScript.sh"))))
> | 
> | (add-hook 'org-babel-post-tangle-hook 'org-babel-run-post-tangle-script)
> `----
> 
> But something is wrong with the function, as it does not work. 
> 
> Any suggestions?

(defun org-babel-run-post-tangle-script ()
  (if org-babel-tangle-run-postTangleScript
      (progn
        (message "running the PostTangleScript.sh bash shell script")
        (shell-command "bash ./postTangleScript.sh"))))

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

Re: running function in hook dependent on value of a variable

[Rainer M Krug]

Barry Margolin <barmar@alum.mit.edu> writes:

> In article <mailman.1558.1371133630.22516.help-gnu-emacs@gnu.org>,
>  Rainer M Krug <Rainer@krugs.de> wrote:
>
>> Hi
>> 
>> I want to run a function in a hook only if the value of a variable is
>> non-nil. I have gotten that far with my less then rudimentary lisp knowledge:
>> 
>> ,----
>> | (defvar org-babel-tangle-run-postTangleScript nil
>> |   "If non-nil, postTangleScript.sh will be executed")
>> | (put 'org-babel-tangle-run-postTangleScript 'safe-local-variable 'booleanp)
>> | 
>> | (defun org-babel-run-post-tangle-script ()
>> |   (if org-babel-tangle-run-postTangleScript
>> |       (	(message "running the postTangleScript.sh bash shell script")
>> | 	(shell-command "bash ./postTangleScript.sh"))))
>> | 
>> | (add-hook 'org-babel-post-tangle-hook 'org-babel-run-post-tangle-script)
>> `----
>> 
>> But something is wrong with the function, as it does not work. 
>> 
>> Any suggestions?
>
> (defun org-babel-run-post-tangle-script ()
>   (if org-babel-tangle-run-postTangleScript
>       (progn
>         (message "running the PostTangleScript.sh bash shell script")
>         (shell-command "bash ./postTangleScript.sh"))))
<#secure method=pgpmime mode=sign>

Thanks,

Rainer

-- 
Rainer M. Krug

email: RMKrug<at>gmail<dot>com