Re: [BUG] Source block indentation does not work properly for yaml-mode [9.6.6 ( @ /home/user/.emacs.d/elpa/org-9.6.6/)]

[Ihor Radchenko]

Sébastien Miquel <sebastien.miquel@posteo.eu> writes:

> Here are two patches, the first that removes the special case logic
> for LaTeX fragments, and the second that implements what you suggest,
> and applies on top of the first one. Does that look ok to you ?

Thanks!

> +      ;; Apply WRITE-BACK function on edit buffer contents.
> +      (goto-char (point-min))
> +      (when (functionp write-back) (save-excursion (funcall write-back)))
>        (set-marker marker nil))))

`save-excursion' is no longer necessary here.

>  (defun org-src--edit-element
> @@ -1150,7 +1149,14 @@ Throw an error when not at such a table."
>         (lambda ()
>        ;; Blank lines break things, replace with a single newline.
>        (while (re-search-forward "\n[ \t]*\n" nil t) (replace-match "\n"))
> -      ;; If within a table a newline would disrupt the structure,
> +         ;; Trim contents.

It would be nice to have a bit more context about the purpose in the
comment here.

> Subject: [PATCH] org-src.el: Use native value of `indent-tabs-mode' for
>  indentation
>
> * lisp/org-src.el (org-src--contents-for-write-back): Preserve the
> native indentation (spaces vs tabs).  If necessary, add a common org
> indentation to the block according to org's `indent-tabs-mode'.
> (org-src-font-lock-fontify-block): In case of mixed indentation,
> display the tab characters with a fixed width, according to the native
> tab width value.
> * testing/lisp/test-org-src.el (test-org-src/indented-blocks): Update
> tests.  Indentation no longer obeys `indent-tabs-mode' from the org
> buffer, but is separated in two parts.

> diff --git a/lisp/org-src.el b/lisp/org-src.el
> index 5c272c7f5..5a1030c42 100644
> --- a/lisp/org-src.el
> +++ b/lisp/org-src.el
>  ...
> -       (skip-chars-forward " \t")
> -          (when (or (not (eolp))                               ; not a blank 
> line
> -                    (and (eq (point) (marker-position marker)) ; current line
> +          (when (or (not (eolp)) ; not an empty line
> +                    ;; If the current line is empty, we may
> +                    ;; want to indent it.
> +                    (and (eq (point) (marker-position marker))
>                           preserve-blank-line))

Do we still need this dance with special case for current line?

> +    ;; Display tab indentation characters preceded by spaces as spaces
> +    (unless org-src-preserve-indentation

unless? Don't we rather want to preserve the original indentation
alignment when `org-src-preserve-indentation' is t?

> +      (save-excursion
> +        (goto-char start)
> +        (while (re-search-forward "^[ ]+\\([\t]+\\)" end t)

Why just tabs at indentation? It would make sense to preserve width of
all the tabs.

> +          (let* ((b (match-beginning 1))
> +                 (e (match-end 1))
> +                 (s (make-string (* (- e b) native-tab-width) ? )))
> +            (add-text-properties b e `(display ,s))))))

Will the actual tab width be always equal to native-tab-width? What
about tab stops? May it be more reliable to use different of column
numbers in the src mode buffer after/before the tab?

> @@ -318,19 +318,21 @@ This is a tab:\t.
>                argument2))
>    #+END_SRC"
>        (setq-local indent-tabs-mode t)
> -      (let ((org-edit-src-content-indentation 2)
> +      (let ((tab-width 8)
> +            (org-edit-src-content-indentation 2)

Why is setting tab-width necessary? 8 is the default value.

>    #+BEGIN_SRC emacs-lisp<point>
> -    (progn\n      (function argument1\n\t\targument2))
> +    (progn\n      (function argument1\n    \targument2))

I think it would be a bit more readable to convert this string into
actual multi-line, where the alignment is visible when reading the test
source.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>