Re: Re: [babel] After Tangle Change File Permission

From: "Eric Schulte" <schulte.eric@gmail.com>
To: Dan Davison <dandavison7@gmail.com>
Cc: Org Mode Mailing List <emacs-orgmode@gnu.org>
Subject: Re: Re: [babel] After Tangle Change File Permission
Date: Wed, 09 Feb 2011 18:10:24 -0700	[thread overview]
Message-ID: <87wrl8oeja.fsf@gmail.com> (raw)
In-Reply-To: m1oc6l1pg4.fsf@94.196.91.150.threembb.co.uk

Dan Davison <dandavison7@gmail.com> writes:

> Ian Barton <lists@manor-farm.org> writes:
>
>> I am starting to use babel to maintain my collection of shell
>> scripts. I want to automate the process as much as possible, so I
>> would like to be able to set the execute bit on my tangled .sh scripts
>> after the tangle process.
>>
>> I see that there is an after-tangle hook. Can anyone give me some
>> hints as to how I might use this to execute a chmod *.sh on the
>> directory containing my tangles shell scripts.
>
> Hi Ian,
>
> It looks like Eric has already implemented this particular case in a
> different way: if the :shebang header arg is set, then the file will be
> made executable. E.g. :shebang #!/bin/bash.
>

True this is probably the easiest way.

>
> However, to use the hook function, does something like this not work?
>
> #+begin_src emacs-lisp
> (defun dan/make-tangled-shell-files-executable () (shell-command "chmod +x *.sh"))
> (add-hook 'org-babel-post-tangle-hook 'dan/make-tangled-shell-files-executable)
> #+end_src
>

The org-babel-post-tangle-hook is evaluated in the tangled file, so the
following should work as well...

#+begin_src emacs-lisp
  (defun eric/make-tangled-files-executable ()
    (set-file-modes (buffer-file-name) #o755))
  (add-hook 'org-babel-post-tangle-hook 'eric/make-tangled-files-executable)
#+end_src

>
> I admit I was getting some inconsistent results just then that I didn't
> understand. It should be possible to use
>
> #+begin_src emacs-lisp
> (add-hook 'org-babel-post-tangle-hook
> 'dan/make-tangled-shell-files-executable nil 'local)
> #+end_src
>
> so that the hook is set locally for the buffer in question.
>
> The code is
>
> #+begin_src emacs-lisp
>       (when org-babel-post-tangle-hook
> 	(mapc
> 	 (lambda (file)
> 	   (org-babel-with-temp-filebuffer file
> 	     (run-hooks 'org-babel-post-tangle-hook)))
> 	 path-collector))
> #+end_src
>
> , where `path-collector' is a list of tangled files. I believe that this
> implies that, each time the hook is run, default-directory will be equal
> to the directory containing the file in question,

true

> so the shell-command should run in that directory. Otoh, the above
> shows that the hook is run for each tangled file, so chmod +x *.sh
> would be executed more times than necessary.
>

yes, I think the solution above should be a little bit more efficient.

Cheers -- Eric

>
> Dan
>
>>
>> Ian.
>>
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