#!/usr/bin/env bash
# mav-tmux — run a command in the persistent mav tmux session and capture output
# usage: mav-tmux run "command"
#        mav-tmux read          (capture current pane output)
#        mav-tmux clear         (clear the pane)
SESSION="mav"

# ensure session exists
TMUX= tmux has-session -t "$SESSION" 2>/dev/null || TMUX= tmux new-session -d -s "$SESSION"

case "${1:-read}" in
  run)
    CMD="${2:?usage: mav-tmux run <command>}"
    MARKER="__DONE_$(date +%s%N)__"
    TMUX= tmux send-keys -t "$SESSION" "$CMD; echo $MARKER" Enter
    # wait for marker
    for i in $(seq 1 60); do
      sleep 0.5
      OUT=$(TMUX= tmux capture-pane -t "$SESSION" -p 2>/dev/null)
      if echo "$OUT" | grep -q "$MARKER"; then
        echo "$OUT" | sed "/$MARKER/d" | sed '/^$/d' | tail -30
        break
      fi
    done
    ;;
  read)
    TMUX= tmux capture-pane -t "$SESSION" -p 2>/dev/null
    ;;
  clear)
    TMUX= tmux send-keys -t "$SESSION" "clear" Enter
    ;;
  *)
    echo "usage: mav-tmux run <cmd> | read | clear"
    ;;
esac