TBLFM trying to create an infinite number of lines

TBLFM trying to create an infinite number of lines

[Julien Palard]

Hi,

I was playing with the idea of calling subprocesses from TBLFM (good idea or not)...

...and found that:

    |  |
    #+TBLFM: $1='(shell-command-to-string "echo 42")

Tries to build an infinitly long table (I have to interrupt it with C-g).

While:

    |  |
    #+TBLFM: $1=42

Which looks the same to my eyes behave cleanly by just updating the single line.

Is that a bug or did I misunderstood something?

I'm using Org 9.5.5 on emacs 28.2 on Debian.
-- 
[Julien Palard](https://mdk.fr)

Re: TBLFM trying to create an infinite number of lines

[Bruno Barbier]

Julien Palard <julien@palard.fr> writes:

> Hi,
>
> I was playing with the idea of calling subprocesses from TBLFM (good idea or not)...
>
> ...and found that:
>
>     |  |
>     #+TBLFM: $1='(shell-command-to-string "echo 42")
>
> Tries to build an infinitly long table (I have to interrupt it with C-g).
...
> Is that a bug or did I misunderstood something?

Same here with 9.6-pre (release_9.5.5-1096-gf83e45).

Like with:

    |  | 
    #+TBLFM: $1='(eval "\n")

IIUC, the command "echo 42" outputs a newline, newlines are not allowed
as in cell values.

So a workaround would be to trim the output:

    | 42 |
    #+TBLFM: $1='(string-trim (shell-command-to-string "echo 42"))


But, you should report it as a bug: org should raise an error, not enter
an infinite loop, generating an infinite amount of text.



Bruno




>
> I'm using Org 9.5.5 on emacs 28.2 on Debian.
> -- 
> [Julien Palard](https://mdk.fr)

Re: TBLFM trying to create an infinite number of lines

[Ihor Radchenko]

Bruno Barbier <brubar.cs@gmail.com> writes:

> Same here with 9.6-pre (release_9.5.5-1096-gf83e45).
>
> Like with:
>
>     |  | 
>     #+TBLFM: $1='(eval "\n")
>
> IIUC, the command "echo 42" outputs a newline, newlines are not allowed
> as in cell values.

Thank you both for reporting!
Fixed on bugfix.
https://git.savannah.gnu.org/cgit/emacs/org-mode.git/commit/?id=97a780f0b

-- 
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>

Re: TBLFM trying to create an infinite number of lines

[Julien Palard]

> Thank you both for reporting!

Thank you for fixing!

-- 
[Julien Palard](https://mdk.fr)