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Old 10-24-2004, 09:36 PM   #1
LQ Newbie
Registered: Oct 2004
Posts: 6

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Lisp/Emacs: How to do a macro on a buffer-name with another extension

Hi! :-)

I am learning to use emacs, and really like it!

I edit latex texts, and I programmed a macro to make "pdflatex" quickly; this are the lines in my .emacs:

(defun pdflatex () 
  "Run <pdflatex> on the current buffer's file." 
     (let ((cb (current-buffer))) 
        (set-buffer (get-buffer-create "*TEMP*")) 
        (call-process "pdflatex" nil t nil (buffer-file-name cb) ) 
(global-set-key [(meta p)] 'pdflatex)
(in fact, I copied it from a tutorial and simply made some minor and necessary changes).

My problem now is this: I would like to do a macro that runs "acrobat reader", but on a file whose name is the same of the buffer-name, but with another extension (".pdf"). I hope I made myself clear...

Thank you! :-)
Old 10-24-2004, 10:53 PM   #2
Senior Member
Registered: Jun 2004
Posts: 2,553

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i think i know what you mean
to return current buffername + ".pdf"

(concat (buffer-file-name (current-buffer)) ".pdf" )

i think that will work

when you need to see what an expression will be like this one
will get you an eval: prompt
then just middle click the expression in there and hit return
and it will tell you what it sees the expression as

you like using emacs LISP how cool -- bookmark this
Old 10-24-2004, 11:05 PM   #3
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Registered: Oct 2004
Posts: 6

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Thank you very much for your reply!

I wasn't clear enough: I need the ".pdf" extension, but without the ".tex" extension of the file name. I mean, the buffer's name is: "foo.tex", so I want to get "foo.pdf". If I use your advice, I get "foo.tex.pdf".
Old 10-25-2004, 10:26 PM   #4
LQ Newbie
Registered: Oct 2004
Posts: 6

Original Poster
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Finally, I found a solution (at least, it works for me... )

I use the function "substring":

(call-process "/usr/local/Acrobat5/bin/acroread" nil t nil (concat (substring (buffer-file-name cb) 0 -4) ".pdf" ))
It works because the files I want to apply this macro always end with ".tex"


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