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.tmux.confでifを使う

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tmux-powerlineを使い始めたのですが、設定ファイルを複数端末で共有している関係で、tmux-powerlineがインストールされていない場合は読み込まないようにしたいと思いました。
.tmux.confはシェルスクリプトではないので、あまり自由度は高くないのですが、ifは使うことができます。
syntaxはif shell-command command [command] となっていて、shell-commandのexit codeが0の時のみcommandが実行されます。

今回はこんな感じで~/work/tmux-powerlineが存在するときのみ設定をロードするようにしてみました。

tmux.conf
if "test -d ~/work/tmux-powerline" "set-option -g status-left '#(~/work/tmux-powerline/status-left.sh)'"
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