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Re: elisp function that evaluates a line up to last character

From: Eric Abrahamsen
Subject: Re: elisp function that evaluates a line up to last character
Date: Tue, 19 Mar 2019 11:39:59 -0700
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Jason Thomas <address@hidden> writes:

> Hello,
> I am trying to write a function that will (1) take a new region, defined by
> the first character in the current line (where the cursor is) and end the
> region at the penultimate character in the same line; and
> (2) pass this text to another function (called ess-eval-region).
> Basically, I am trying to evaluate some code that ends with a semi-colon,
> but I need to leave out the semi-colon (during evaluation).  Here is what I
> have so far (at the end, I try to bind this function to <C-return> and
> activate
> this binding in ess mode):
> (defun my-stata-eval-delim-line (&optional beg end)
>   (interactive)
>   (let ((beg (cond (beg beg)
>                    ((region-active-p)
>                     (region-beginning))
>                    (t (line-beginning-position))))
>         (end (cond (end end)
>                    ((region-active-p)
>                     (copy-marker (region-end))
>                     (backward-char))
>                    (t (line-end-position)))))
>     (ess-eval-region beg end)))
> (eval-after-load 'ess-stata-mode
>                  '(define-key ess-mode-map "<C-return>"
> 'my-stata-eval-delim-line))
> but I keep getting an error when I try to use the function on the following
> line:
> ds;
>   "Wrong number of arguments: (3 . 5), 2"

This just looks like `ess-eval-region' requires between 3 and 5 arguments,
but you've only given it two: beg and end.

Depending on how you're going to use this function, might also consider
using the "r" interactive code, sort of like:

(defun my-stata-eval-delim-line (&optional beg end)
  (interactive "r")
  (let ((beg (if (region-active-p)
        (end (if (region-active-p)
               (- (line-end-position) 1))))
    (ess-eval-region beg end)))

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