#!/bin/sh
# Load powerline's tmux bindings, if powerline is installed at all.
#
# tmux.conf used to source
#   /usr/lib/python3.11/site-packages/powerline/bindings/tmux/powerline.conf
# which pins a Python minor version into a path. That breaks on every Python
# upgrade and had already broken everywhere: beastix is on 3.14, and shron had
# the line commented out entirely until a checkout replaced its tmux.conf with
# a copy carrying the dead path. Every tmux session there then opened with
#   No such file or directory: /usr/lib/python3.11/...
#
# Resolving the path from the module itself keeps it correct across upgrades,
# and every step is allowed to fail quietly so a machine without powerline -
# the Mac has neither it nor tmux - simply gets nothing.
set -u

command -v powerline-daemon >/dev/null 2>&1 || exit 0
command -v python3 >/dev/null 2>&1 || exit 0

powerline-daemon -q 2>/dev/null || exit 0

dir=$(python3 -c 'import os, powerline; print(os.path.dirname(powerline.__file__))' 2>/dev/null) || exit 0
[ -n "$dir" ] || exit 0

conf="$dir/bindings/tmux/powerline.conf"
[ -r "$conf" ] || exit 0

tmux source-file "$conf"