"no space for new pane"" error when scripting tmux pane creation

[Sivaram Neelakantan]

I was experimenting with scripting tmux via bash and I got the above
error at the fifth pane creation. I was under the impression that
tmux will auto resize panes to the smallest size and then issue such a
warning when it can no longer fit panes to the visible screen.

--8<---------------cut here---------------start------------->8---
#!/usr/bin/env bash

tmux start-server

tmux new-session -d -s MySession -n Shell1 -d "/usr/bin/env bash -i"
tmux split-window -t MySession:1 "/usr/bin/env bash -i"
tmux split-window -t MySession:1 "/usr/bin/env bash -i"
tmux split-window -t MySession:1 "/usr/bin/env bash -i"
tmux split-window -t MySession:1 "/usr/bin/env bash -c \"echo 'fifth shell'\"; /usr/bin/env bash -i"
tmux select-layout -t MySession:1 tiled
--8<---------------cut here---------------end--------------->8---

4 panes got created though and I was within the tmux session after
running the script.

How do I fix this? Relatedly, how do I generalise the script for
various screen sizes of laptops and other screens to fill it up with
panes of a certain size?

sivaram
--

[Nicholas Marriott]

On Sat, May 02, 2020 at 09:39:37PM +0530, Sivaram Neelakantan wrote:
> I was experimenting with scripting tmux via bash and I got the above
> error at the fifth pane creation. I was under the impression that
> tmux will auto resize panes to the smallest size and then issue such a
> warning when it can no longer fit panes to the visible screen.

No, this has never been the case, tmux will split a pane if it is big
enough to split into two without moving other panes.

>
> --8<---------------cut here---------------start------------->8---
> #!/usr/bin/env bash
>
> tmux start-server
>
> tmux new-session -d -s MySession -n Shell1 -d "/usr/bin/env bash -i"
> tmux split-window -t MySession:1 "/usr/bin/env bash -i"
> tmux split-window -t MySession:1 "/usr/bin/env bash -i"
> tmux split-window -t MySession:1 "/usr/bin/env bash -i"
> tmux split-window -t MySession:1 "/usr/bin/env bash -c \"echo 'fifth shell'\"; /usr/bin/env bash -i"
> tmux select-layout -t MySession:1 tiled
> --8<---------------cut here---------------end--------------->8---
>
> 4 panes got created though and I was within the tmux session after
> running the script.
>
> How do I fix this? Relatedly, how do I generalise the script for
> various screen sizes of laptops and other screens to fill it up with
> panes of a certain size?

The easiest things to do are to either make the session big enough to
fit all the panes even when they are split:

tmux new -d -x 200 -y 200 ...

Or to apply the tiled layout after every split (this is what I tend to
do):

tmux splitw -tMySession:1 ... \; selectl tiled

[Sivaram Neelakantan]

On Sat, May 02 2020,Nicholas Marriott wrote:


[snipped 30 lines]

> The easiest things to do are to either make the session big enough to
> fit all the panes even when they are split:
>
> tmux new -d -x 200 -y 200 ...
>
> Or to apply the tiled layout after every split (this is what I tend to
> do):
>
> tmux splitw -tMySession:1 ... \; selectl tiled

I still get the same error with these changes; what am I doing wrong?

--8<---------------cut here---------------start------------->8---

tmux new-session -d -s MySession -n Shell1 -d "/usr/bin/env bash -i"

tmux split-window -t MySession:1 "/usr/bin/env bash -i ; selectl tiled"
tmux split-window -t MySession:1 "/usr/bin/env bash -i ;selectl tiled"
tmux split-window -t MySession:1 "/usr/bin/env bash -i ;selectl tiled"
tmux split-window -t MySession:1 "/usr/bin/env bash -c \"echo 'fifth shell'\"; /usr/bin/env bash -i ;selectl tiled"

tmux select-layout -t MySession:1 tiled
--8<---------------cut here---------------end--------------->8---

sivaram
--

[Nicholas Marriott]

You need a \ before ; so it gets passed to tmux rather than interpreted by the shell.

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[Sivaram Neelakantan]

On Sat, May 02 2020,Nicholas Marriott wrote:

> You need a \ before ; so it gets passed to tmux rather than interpreted by the shell.
>

[snipped 17 lines]

>
> --8<---------------cut here---------------start------------->8---
>
> tmux new-session -d -s MySession -n Shell1 -d "/usr/bin/env bash -i"
> tmux split-window -t MySession:1 "/usr/bin/env bash -i ; selectl tiled"
> tmux split-window -t MySession:1 "/usr/bin/env bash -i ;selectl tiled"
> tmux split-window -t MySession:1 "/usr/bin/env bash -i ;selectl tiled"
> tmux split-window -t MySession:1 "/usr/bin/env bash -c \"echo 'fifth shell'\"; /usr/bin/env bash -i ;selectl tiled"
> tmux select-layout -t MySession:1 tiled
> --8<---------------cut here---------------end--------------->8---

Putting a slash before ; resulted in 4 panes showing up briefly and
it all went away to be replaced with a single pane. Upon exit, same
error message was there.

The one below worked and I got 5 panes with the last pane taking up the full
screen width at the bottom.

--8<---------------cut here---------------start------------->8---
tmux new-session -d -s MySession -n Shell1 -d "/usr/bin/env bash -i"

tmux select-layout -t MySession:1 tiled

tmux split-window -t MySession:1 "/usr/bin/env bash -i"

tmux select-layout -t MySession:1 tiled

tmux split-window -t MySession:1 "/usr/bin/env bash -i"

tmux select-layout -t MySession:1 tiled

tmux split-window -t MySession:1 "/usr/bin/env bash -i"

tmux select-layout -t MySession:1 tiled

tmux split-window -t MySession:1 "/usr/bin/env bash -i"

tmux select-layout -t MySession:1 tiled
--8<---------------cut here---------------end--------------->8---

This is on 3.1b.



sivaram
--

[Nicholas Marriott]

You need to put the " \; selectl tiled" outside the quotes, it is a
separate tmux command, not part of the bash command.

> --
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> To unsubscribe from this group and stop receiving emails from it, send an email to tmux-users+...@googlegroups.com.

> To view this discussion on the web, visit https://groups.google.com/d/msgid/tmux-users/krpqx3a72qi5w6.fsf%40gmail.com.

[Sivaram Neelakantan]

On Sat, May 02 2020,Nicholas Marriott wrote:

> You need to put the " \; selectl tiled" outside the quotes, it is a
> separate tmux command, not part of the bash command.
>

aargh. Yes, that worked. Sorry.

[snipped 41 lines]


sivaram
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