tmux.conf: use brackets for if-shell commands

[crpb]

• it's easier to read \ó/

[mika]

Nice idea, thanks! Not sure how backwards compatible this is (you've confirmed with bullseye according to IRC), basically LGTM, leaving the +2 to @jkirk :)

[mika]

From IRC: we seem to have issues with tmate, to be clarified :-/

[crpb]

Sadly it seems (fooding old) tmate isn't liking any of those {}

test@obelix:~$ grep '[{}]' /etc/tmux.conf
bind-key B if-shell '! tmux has-session -t bg' {
...
}
test@obelix:~$ tmate
lost server

ant it already complains about this new thing

grml-etc-core/etc/tmux.conf

Line 65 in d891ce5

if-shell "command -v hostname && hostname --help | grep -q -- -I" { set -g status-right "#[fg=green](net: #(hostname -I | sed -e 's/ [^ ]*:.*$//;s/ / | /g;s/ | $//')) #[fg=yellow]%Y-%m-%d %H:%M" } { set -g status-right '#[fg=yellow]%Y-%m-%d %H:%M' }

cb@obelix ~dls % schroot --directory=/ --user root --chroot=source:app_bookworm
obelix# wget -O /etc/tmux.conf https://raw.githubusercontent.com/grml/grml-etc-core/refs/heads/master/etc/tmux.conf
--2025-03-28 15:46:34--  https://raw.githubusercontent.com/grml/grml-etc-core/refs/heads/master/etc/tmux.conf
Resolving raw.githubusercontent.com (raw.githubusercontent.com)... 2606:50c0:8003::154, 2606:50c0:8000::154, 2606:50c0:8001::154, ...
Connecting to raw.githubusercontent.com (raw.githubusercontent.com)|2606:50c0:8003::154|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2844 (2.8K) [text/plain]
Saving to: '/etc/tmux.conf'

/etc/tmux.conf                              100%[========================================================================================>]   2.78K  --.-KB/s    in 0.003s

2025-03-28 15:46:34 (825 KB/s) - '/etc/tmux.conf' saved [2844/2844]

obelix# apt update; apt install -y tmate
....
obelix# tmate
/etc/tmux.conf:65: usage: if-shell [-bF] [-t target-pane] shell-command command [command]                                                                               [0/0]
Tip: if you wish to use tmate only for remote access, run: tmate -F
....

Maybe tmate needs to unlearn about /etc/tmux.conf 🙈

https://salsa.debian.org/debian/tmate/-/blob/upstream/tmux.h?ref_type=heads#L56