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I want to send the region to a python subprocess on stdin, using command as the argument of python -c [command]. Further I want to insert the result into the current buffer if I have called the function with a prefix argument.

Here's what I've tried:

(defun abcdef/python-region (prefix command &optional b e)
  "Call python with `command' and send region on stdin. 
  Insert result if prefix present."
  (interactive "Psr")
  (call-process-region b e "python" prefix t "-c" command))

When I try calling it interactively with M-x abcdef/python-region I get Wrong type argument: stringp, t.

Related question here.

Drew
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Hatshepsut
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1 Answers1

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I don't quite see how you'd get that particular error, but your interactive form isn't providing the arguments you need.

It should look something like this:

(interactive "P\nsCommand: \nr")

Usually the argument of ‘interactive’ is a string containing a code letter followed optionally by a prompt. (Some code letters do not use I/O to get the argument and do not use prompts.) To pass several arguments to the command, concatenate the individual strings, separating them by newline characters.

— C-hf interactive

phils
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