Calling a custom emacs function with arguments

Question

I've got this function in my .bash_rc:

function ForwardSearchXdvi {
latex -src *.tex;
for i in *.dvi; do xdvi -sourceposition "$1 ${i/.dvi/.tex}" $i; done ;
}

it works... I call it by command line with the $1 argument (the target line number in my file.tex) and it's fine.

I'd like to run it directly from emacs so I made this command:

(defun ForwardXdviSearch ()
(interactive)
(shell-command (format "bash -ic %s" (shell-quote-argument "latex -src J[HCI]*.tex; for i in J[HCI]*.dvi; do xdvi -sourceposition \"$1 ${i/.dvi/.tex}\" $i; done ;")))
)

How can I pass the argument $1 to the function when I call it with "M-x Function" ?

Make sure you read C-h f interactive

phils
– phils

2013-07-16 10:33:36 +00:00
Commented Jul 16, 2013 at 10:33 — phils
– phils, Commented Jul 16, 2013 at 10:33

juanleon · Accepted Answer · 2013-07-16 10:30:51Z

2

You would need to use special form interactive for reading arguments. Something like this untested code:

(defun forward-xdvi-search (line-number)
  (interactive "nForward to line: ")
  (shell-command
   (format "bash -ic %s"
           (shell-quote-argument
            (format "latex -src J[HCI]\*.tex; for i in J[HCI]\*.dvi; do xdvi -sourceposition \"%d ${i/.dvi/.tex}\" $i; done ;"
                    line-number)))))

Edited with the improvement suggested by @phils

answered Jul 16, 2013 at 10:30

juanleon

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8 Comments

phils Over a year ago

interactive has a code for reading numbers, so you can use "nForward to line: "

Gabriele Over a year ago

It doesn't work for me. I obtain:

Wrong number of arguments: (lambda (line) (interactive) (shell-command (format "bash -ic %s" (shell-quote-argument "latex -src J[HCI]*.tex; for i in J[HCI]*.dvi; do xdvi -sourceposition \"$1 ${i/.dvi/.tex}\" $i; done ;")))), 0

juanleon Over a year ago

@phils Right! I should have read C-h f interactive myself :-) Updated the code with your suggestion.

juanleon Over a year ago

@GabrieleNicolardi, it seems you did not copied the code right, you copied (interactive), instead of (interactive "nForward to line: "), so emacs cannot figure how to read the 1st argument.

Gabriele Over a year ago

@juanleon, thank you very much for your help but I copied the code right and it doesn't work. I'm trying to figure out how to pass the argument to the function. I tried C-u "number" M-x Function. I tried M-x Function. No way. I'm not a programmer so please, don't blame me.

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