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nixos/tmux: use idempotent new-session to avoid duplicate sessions

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When both NixOS programs.tmux and home-manager tmux configs set
newSession = true, tmux would create two sessions on startup since
both /etc/tmux.conf and ~/.config/tmux/tmux.conf contain the
new-session command.

Change new-session to new-session -A -s 0, which attaches to session
"0" if it exists, otherwise creates it. This makes the command
idempotent so multiple configs can safely enable newSession.
This commit is contained in:
Bernardo Meurer Costa 2025-12-06 06:06:27 +00:00
commit b3b1a85370
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1 changed files with 6 additions and 1 deletions
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7
nixos/modules/programs/tmux.nix
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@ -29,7 +29,12 @@ let
setw -g pane-base-index ${toString cfg.baseIndex}
set -g history-limit ${toString cfg.historyLimit}
${optionalString cfg.newSession "new-session"}
${optionalString cfg.newSession ''
# Use -A to make new-session idempotent: attach if session "0" exists,
# otherwise create it. This prevents duplicate sessions when multiple
# configs (e.g., system and user) both enable newSession.
new-session -A -s 0
''}
${optionalString cfg.reverseSplit ''
bind v split-window -h