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tmux-util ls is an opinionated replacement for `tmux ls` with columns for state (attached/detached), name, idle time (humanized), window count, and the current pane's cwd (tilde-fied if it sits under $HOME).
The cwd query goes through `tmux display -p -t <session> '#{pane_current_path}'`, which returns the cwd of the active pane of the active window. That's close enough to "what the session is about" for a one-line summary.
Idle calculation reads `date +%s` by default and accepts an override via the TMUX_UTIL_NOW env var so tests can pin "now" to a known epoch.
12 new tests cover Normal cases (attached / detached, multiple sessions) and Boundary cases (no sessions, idle exactly at minute / hour / day boundaries, $HOME tilde). One existing dispatch test got reworked because the original stub target (`ls`) is no longer unimplemented. Total suite is 26 tests, all green.
The fake-tmux harness picked up two things along the way: real format-string parsing for `list-sessions -F` and a new handler for `display -p`. The state file format extended to include activity epoch, window count, and cwd, with sensible defaults for older 3-tuple test inputs so the reap tests keep passing untouched.
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A new utility in dotfiles/common/.local/bin/ for managing tmux sessions. The eventual plan covers six subcommands (go, pick, ls, find, reap, rename). This commit ships the skeleton, the dispatch + help, and the first subcommand: reap.
reap walks every unattached tmux session whose name doesn't match $TMUX_UTIL_REAP_SKIP (default `^aiv-`), sends SIGHUP to each pane's PID (the same signal that fires when you close a terminal window), waits up to three seconds for the session to wind down, and falls back to `tmux kill-session` if anything's still alive.
Tests live under tests/tmux-util/ with the same fake-binary-on-PATH pattern layout-navigate uses. fake-tmux reads canned session state from a file and records every invocation. fake-kill records signal calls without sending them. fake-sleep is a no-op so tests don't actually wait. 14 tests cover Normal / Boundary cases for dispatch + reap. Run them with:
cd tests && python3 -m unittest tmux-util.test_tmux_util
The other five subcommands stub out for now and exit non-zero with "not implemented yet" so future TDD turns can drop them in one at a time.
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