* How to run indent command in arbitrary buffer while respecting user settings?
@ 2023-06-29 19:44 Ihor Radchenko
2023-06-30 5:01 ` Tassilo Horn
2023-06-30 5:50 ` Eli Zaretskii
0 siblings, 2 replies; 4+ messages in thread
From: Ihor Radchenko @ 2023-06-29 19:44 UTC (permalink / raw)
To: emacs-devel
Hello,
In Org mode, we sometimes have a need to use third-party major mode to
do indentation:
#+begin_src emacs-lisp
(when t
'indent-me)
#+end_src
To do this, we currently create a major mode buffer containing the code
and run whatever is bound to <TAB> there.
This, however, is broken when user re-binds <TAB> to something else.
Or when something like evil-mode re-binds <TAB>
(https://github.com/emacs-evil/evil/issues/1806)
I am now considering running
(funcall-interactively #'indent-for-tab-command)
However, looking at 25 Indentation section of Elisp manual:
The simplest way to perform indentation is the <TAB> key. In most
major modes, this runs the command ‘indent-for-tab-command’. (In C and
related modes, <TAB> runs the command ‘c-indent-line-or-region’, which
behaves similarly, *note C Indent::).
I noticed that C and related modes have some alternative setting for
indentation. So, using `indent-for-tab-command' appear to be not as
reliable, after all.
Is there any reliable way to perform indentation in an arbitrary major
mode programmatically?
I notice that cc-mode.el has a comment that the current <TAB> re-binding
is at least debatable:
(substitute-key-definition 'indent-for-tab-command
;; XXX Is this the right thing to do
;; here?
'c-indent-line-or-region
c-mode-base-map global-map)
So, should I simply ignore what cc-mode does and go ahead relying upon
`indent-for-tab-command' doing the right thing?
--
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>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to run indent command in arbitrary buffer while respecting user settings?
2023-06-29 19:44 How to run indent command in arbitrary buffer while respecting user settings? Ihor Radchenko
@ 2023-06-30 5:01 ` Tassilo Horn
2023-06-30 11:51 ` Ihor Radchenko
2023-06-30 5:50 ` Eli Zaretskii
1 sibling, 1 reply; 4+ messages in thread
From: Tassilo Horn @ 2023-06-30 5:01 UTC (permalink / raw)
To: Ihor Radchenko; +Cc: emacs-devel
Ihor Radchenko <yantar92@posteo.net> writes:
> Is there any reliable way to perform indentation in an arbitrary major
> mode programmatically?
Does `indent-region' do the right thing? That honors
`indent-region-function' if set (which it is also in cc-modes) or use
`indent-according-to-mode' (which uses `indent-line-function')?
Bye,
Tassilo
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to run indent command in arbitrary buffer while respecting user settings?
2023-06-30 5:01 ` Tassilo Horn
@ 2023-06-30 11:51 ` Ihor Radchenko
0 siblings, 0 replies; 4+ messages in thread
From: Ihor Radchenko @ 2023-06-30 11:51 UTC (permalink / raw)
To: Tassilo Horn; +Cc: emacs-devel
Tassilo Horn <tsdh@gnu.org> writes:
> Ihor Radchenko <yantar92@posteo.net> writes:
>
>> Is there any reliable way to perform indentation in an arbitrary major
>> mode programmatically?
>
> Does `indent-region' do the right thing? That honors
> `indent-region-function' if set (which it is also in cc-modes) or use
> `indent-according-to-mode' (which uses `indent-line-function')?
Thanks!
I completely forgot about `indent-according-to-mode'.
Although note that `c-indent-line-or-region' will behave differently
from `indent-according-to-mode'.
And what is the purpose of `indent-line-ignored-functions'? It is not
very well documented. The only explanation is in the docstring of
`indent-according-to-mode', which is not very enlightening:
However, if the value of that
variable is present in the `indent-line-ignored-functions' variable,
handle it specially (since those functions are used for tabbing);
in that case, indent by aligning to the previous non-blank line.
what is "tabbing" in the above?
--
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>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to run indent command in arbitrary buffer while respecting user settings?
2023-06-29 19:44 How to run indent command in arbitrary buffer while respecting user settings? Ihor Radchenko
2023-06-30 5:01 ` Tassilo Horn
@ 2023-06-30 5:50 ` Eli Zaretskii
1 sibling, 0 replies; 4+ messages in thread
From: Eli Zaretskii @ 2023-06-30 5:50 UTC (permalink / raw)
To: Ihor Radchenko; +Cc: emacs-devel
> From: Ihor Radchenko <yantar92@posteo.net>
> Date: Thu, 29 Jun 2023 19:44:44 +0000
>
> In Org mode, we sometimes have a need to use third-party major mode to
> do indentation:
>
> #+begin_src emacs-lisp
> (when t
> 'indent-me)
> #+end_src
>
> To do this, we currently create a major mode buffer containing the code
> and run whatever is bound to <TAB> there.
>
> This, however, is broken when user re-binds <TAB> to something else.
> Or when something like evil-mode re-binds <TAB>
> (https://github.com/emacs-evil/evil/issues/1806)
>
> I am now considering running
> (funcall-interactively #'indent-for-tab-command)
>
> However, looking at 25 Indentation section of Elisp manual:
>
> The simplest way to perform indentation is the <TAB> key. In most
> major modes, this runs the command ‘indent-for-tab-command’. (In C and
> related modes, <TAB> runs the command ‘c-indent-line-or-region’, which
> behaves similarly, *note C Indent::).
>
> I noticed that C and related modes have some alternative setting for
> indentation. So, using `indent-for-tab-command' appear to be not as
> reliable, after all.
>
> Is there any reliable way to perform indentation in an arbitrary major
> mode programmatically?
>
> I notice that cc-mode.el has a comment that the current <TAB> re-binding
> is at least debatable:
>
> (substitute-key-definition 'indent-for-tab-command
> ;; XXX Is this the right thing to do
> ;; here?
> 'c-indent-line-or-region
> c-mode-base-map global-map)
>
> So, should I simply ignore what cc-mode does and go ahead relying upon
> `indent-for-tab-command' doing the right thing?
There are other, better alternatives: you could either call
indent-according-to-mode or (funcall indent-line-function) instead.
Yet another alternative is to use indent-region-function.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2023-06-29 19:44 How to run indent command in arbitrary buffer while respecting user settings? Ihor Radchenko
2023-06-30 5:01 ` Tassilo Horn
2023-06-30 11:51 ` Ihor Radchenko
2023-06-30 5:50 ` Eli Zaretskii
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