I'm trying to do something like
if-shell "[[ -r $(python -m site --user-site)/powerline/bindings/tmux/powerline.conf ]]" 'source "$(python -m site --user-site)/powerline/bindings/tmux/powerline.conf"'
,
but it doesn't quite work. I don't want to hard code the path because it might be different between Linux and Mac.
The problem is that in the syntax:
if-shell shell-command tmux-command1 tmux-command2
you can use $() in the 2nd part shell-command as the shell will interpret this, but not in the two tmux command parts. One solution is to make the tmux command a run-shell that runs tmux source-file, i.e. replace your 'source...' by
'run-shell "tmux source-file $(python -m site --user-site)/powerline/bindings/tmux/powerline.conf"'
