enter-tio

enter-tio.sh

#!/usr/bin/env bash
# tio-diff-plug: prompt user to unplug, then wait for a new USB serial TTY and run tio on it.
set -euo pipefail

# --- Check tio availability ---
if ! command -v tio >/dev/null 2>&1; then
  echo "[!] 'tio' not found."
  if command -v brew >/dev/null 2>&1; then
    echo "[i] Installing via Homebrew..."
    brew install tio
  else
    echo "[!] Homebrew not found; please install 'tio' manually:"
    echo "    https://tio.github.io/ or use your package manager."
    exit 1
  fi
fi

# Make unmatched globs expand to nothing
shopt -s nullglob 2>/dev/null || true

PATTERNS=(
  "/dev/tty.usbmodem*"
  "/dev/ttyACM*"
  "/dev/ttyUSB*"
)

list_ttys() {
  local cs=() p f
  for p in "${PATTERNS[@]}"; do
    for f in $p; do [[ -e "$f" ]] && cs+=("$f"); done
  done
  ((${#cs[@]})) && printf '%s\n' "${cs[@]}" | sort -u || :
}

to_tmpfile() {
  local content="${1-}" f
  f="$(mktemp)"
  printf "%s\n" "$content" >"$f"
  echo "$f"
}

echo "[tio-diff] Please unplug your USB device(s) now."
echo "[tio-diff] Press ENTER once you’ve confirmed they’re unplugged..."
read -r _

echo "[tio-diff] Capturing baseline (no devices connected)…"
BASE="$(list_ttys || true)"
BASE_F="$(to_tmpfile "${BASE-}")"

use_udev=0
if [[ "$(uname -s)" == "Linux" ]] && command -v udevadm >/dev/null 2>&1; then
  use_udev=1
fi

echo "[tio-diff] Now plug in your device. Waiting for it to appear…"
while :; do
  if (( use_udev )); then
    udevadm monitor --udev --subsystem-match=tty --property --kernel --environment \
      | awk '/(add|remove)/ { exit }' >/dev/null 2>&1 || true
  else
    sleep 0.4
  fi

  NOW="$(list_ttys || true)"
  NOW_F="$(to_tmpfile "${NOW-}")"
  NEW="$(comm -13 "$BASE_F" "$NOW_F" || true)"
  rm -f "$NOW_F"

  if [[ -n "${NEW-}" ]]; then
    pick="$(ls -t -- $NEW 2>/dev/null | head -n1 || true)"
    if [[ -n "$pick" && -e "$pick" ]]; then
      echo "[tio-diff] New device: $pick"
      exec tio "$pick" "$@"
    fi
  fi
done