Dump file content into a variable, how to?

Dump file content into a variable, how to?

[Ismael Valladolid Torres]

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A hopefully obvious question from a probably Lisp newbie.

I want my .emacs to dired on launch a given directory. The name of the
directory is stored into a file ~/.removable. So I need to "cat" the
file content into a variable, then maybe do a file-directory-p and
finally dired the directory.

But I don't know how to "cat" a file content into a
variable. shell-command will be no useful as I don't need the "cat"
output in the echo area nor in another buffer, I need it into a
variable.

Any ideas welcome.

Cordially, Ismael
-- 
Ismael Valladolid Torres  m. +34679156321
La media hostia           j. ivalladt@gmail.com

http://lamediahostia.blogspot.com/

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Re: Dump file content into a variable, how to?

[Juanma Barranquero]

On 6/19/07, Ismael Valladolid Torres <ivalladt@punkass.com> wrote:

> I want my .emacs to dired on launch a given directory. The name of the
> directory is stored into a file ~/.removable. So I need to "cat" the
> file content into a variable, then maybe do a file-directory-p and
> finally dired the directory.

A simple way is

  (with-temp-buffer
     (insert-file-contents "your-file"
     (setq your-variable (buffer-string))
     ;;; your code here
     )

If you need the literal contents of the file you can use
`insert-file-contents-literally' instead. There are a few more tricks,
but depends on what you intend to do.

Here's a function to do what you requested. You may call it
interactively or just pass the filename as argument, like this

  (dired-from-file "~/.removable")

or even

  (dired-from-file ".removable")

(it defaults to ~/). It's more complex than strictly necessary because
I've opted to program quite defensively.

(defun dired-from-file (file)
  "Ejecuta `dired' en un directorio extraido de FILE."
  (interactive "f")
  (condition-case nil
      (with-temp-buffer
        (insert-file-contents (expand-file-name file "~/"))
        (let ((dir (convert-standard-filename
                    (replace-regexp-in-string "\n$" "" (buffer-string)))))
          (if (file-accessible-directory-p (directory-file-name dir))
              (dired dir)
            (message "%S no accesible" dir))))
    (error (message "Error leyendo %S" file))))

Good luck,
             Juanma

Re: Dump file content into a variable, how to?

[Ismael Valladolid Torres]

Juanma Barranquero escribe:
> On 6/19/07, Ismael Valladolid Torres <ivalladt@punkass.com> wrote:
> 
> >I want my .emacs to dired on launch a given directory. The name of the
> >directory is stored into a file ~/.removable. So I need to "cat" the
> >file content into a variable, then maybe do a file-directory-p and
> >finally dired the directory.
> 
> A simple way is
> 
>  (with-temp-buffer
>     (insert-file-contents "your-file"
>     (setq your-variable (buffer-string))
>     ;;; your code here
>     )
> 
> If you need the literal contents of the file you can use
> `insert-file-contents-literally' instead. There are a few more tricks,
> but depends on what you intend to do.
> 
> Here's a function to do what you requested. You may call it
> interactively or just pass the filename as argument, like this
> 
>  (dired-from-file "~/.removable")
> 
> or even
> 
>  (dired-from-file ".removable")
> 
> (it defaults to ~/). It's more complex than strictly necessary because
> I've opted to program quite defensively.
> 
> (defun dired-from-file (file)
>  "Ejecuta `dired' en un directorio extraido de FILE."
>  (interactive "f")
>  (condition-case nil
>      (with-temp-buffer
>        (insert-file-contents (expand-file-name file "~/"))
>        (let ((dir (convert-standard-filename
>                    (replace-regexp-in-string "\n$" "" (buffer-string)))))
>          (if (file-accessible-directory-p (directory-file-name dir))
>              (dired dir)
>            (message "%S no accesible" dir))))
>    (error (message "Error leyendo %S" file))))
> 

Code below did it:

(when (file-readable-p (expand-file-name "~/.removable"))
  (with-temp-buffer
    (insert-file-contents (expand-file-name "~/.removable"))
    (setq doc (concat (replace-regexp-in-string "\n$" "" (buffer-string)) "/share/doc"))
    (dired doc)))

Gracias. ;)

Cordially, Ismael
-- 
Ismael Valladolid Torres  m. +34679156321
La media hostia           j. ivalladt@gmail.com

http://lamediahostia.blogspot.com/

Re: Dump file content into a variable, how to?

[Juanma Barranquero]

On 6/19/07, Ismael Valladolid Torres <ivalladt@punkass.com> wrote:

> Code below did it:

I'd wrap it in the `condition-case' and all the paraphernalia, just to
be on the safe side.

> Gracias. ;)

Un placer,

             Juanma

Re: Dump file content into a variable, how to?

[Thien-Thi Nguyen]

() Ismael Valladolid Torres <ivalladt@punkass.com>
() Tue, 19 Jun 2007 10:17:28 +0200

   shell-command will be no useful as I don't need the "cat"
   output in the echo area nor in another buffer, I need it into a
   variable.

   Any ideas welcome.

C-h f shell-command TAB TAB

thi