Re: [babel] [BUG] incorrect indentation when tangling with org-src-preserve-indentation

[Dan Davison <davison@stats.ox.ac.uk>]

Antti Kaihola <akaihola@gmail.com> writes:

> Here's another stab at fixing the problem. This one enhances the
> existing trimming algorithm by preserving any leading whitespace on
> the first non-blank line of a block. This probably breaks tangling of
> other languages than Python, but someone more familiar with the babel
> codebase will be able to come up with a saner solution.

Hi Antti,

Thanks for the report and patches. I've just pushed a modification of
your patch, along the lines of

-   "\n" (org-babel-trim body) "\n"))
+   "\n" (org-babel-trim body (if org-src-preserve-indentation "[\f\n\r\v]")) "\n"))

Thus spaces and tabs should no longer be trimmed when
`org-src-preserve-indentation' is non-nil. Hopefully this fixes things.

Dan

>
>
> diff --git a/lisp/ob-python.el b/lisp/ob-python.el
> index c172756..39665c2 100644
> --- a/lisp/ob-python.el
> +++ b/lisp/ob-python.el
> @@ -58,3 +58,3 @@
>      (nth 1 (or processed-params (org-babel-process-params params))) "\n")
> -   "\n" (org-babel-trim body) "\n"))
> +   "\n" (org-babel-indent-safe-trim body) "\n"))
>
> diff --git a/lisp/ob-tangle.el b/lisp/ob-tangle.el
> index 3a0426a..e619e90 100644
> --- a/lisp/ob-tangle.el
> +++ b/lisp/ob-tangle.el
> @@ -368,3 +368,3 @@ form
>        (insert (format "%s\n" (replace-regexp-in-string
> -			      "^," "" (org-babel-trim body))))
> +			      "^," "" (org-babel-indent-safe-trim body))))
>        (when link-p
> diff --git a/lisp/ob.el b/lisp/ob.el
> index b05100c..9d750e7 100644
> --- a/lisp/ob.el
> +++ b/lisp/ob.el
> @@ -1723,2 +1723,9 @@ overwritten by specifying a regexp as a second argument."
>
> +(defun org-babel-indent-safe-trim (string)
> +  "Strip leading and trailing spaces and carriage returns from STRING.
> +Like `org-babel-chomp' only it runs on both the front and back
> +of the string. Preserves leading tabs and spaces on first non-blank line."
> +  (string-match "\\`\\(?:[ \f\t\n\r\v]*\n\\)?\\(\\(?:\n?.*?\\)*?\\)[
> \f\t\n\r\v]*\\'" string)
> +  (match-string 1 string))
> +
>  (defun org-babel-trim (string &optional regexp)
>
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