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| # Cadence — install deps (if needed) and start the dashboard on http://localhost:8000 | |
| # | |
| # bash run.sh → port 8000 | |
| # PORT=8010 bash run.sh → custom port | |
| # | |
| # If the browser says "not answering on 127.0.0.1:8000", this script tells you why | |
| # instead of exiting quietly. | |
| set -uo pipefail | |
| cd "$(dirname "$0")" | |
| PORT="${PORT:-8000}" | |
| bold() { printf '\033[1m%s\033[0m\n' "$*"; } | |
| ok() { printf ' \033[32m✓\033[0m %s\n' "$*"; } | |
| bad() { printf ' \033[31m✗\033[0m %s\n' "$*"; } | |
| warn() { printf ' \033[33m!\033[0m %s\n' "$*"; } | |
| die() { bad "$1"; shift; for line in "$@"; do echo " $line"; done; exit 1; } | |
| # ── 1. python itself ───────────────────────────────────────────────────────── | |
| if ! command -v python3 >/dev/null 2>&1; then | |
| die "python3 is not installed." \ | |
| "macOS: brew install python (or install from python.org)" \ | |
| "Debian/Ubuntu: sudo apt install python3 python3-venv python3-pip" | |
| fi | |
| PYV="$(python3 -c 'import sys;print("%d.%d"%sys.version_info[:2])' 2>/dev/null || echo "?")" | |
| case "$PYV" in | |
| 3.9|3.1[0-9]|3.[2-9][0-9]|[4-9].*) ok "python $PYV" ;; | |
| *) die "python $PYV is too old — Cadence needs 3.9 or newer." \ | |
| "Install a newer python3, then run: bash run.sh" ;; | |
| esac | |
| # ── 2. is the port already taken? ──────────────────────────────────────────── | |
| port_busy() { | |
| if command -v ss >/dev/null 2>&1; then ss -ltn 2>/dev/null | grep -q ":${PORT} "; return $?; fi | |
| if command -v lsof >/dev/null 2>&1; then lsof -iTCP:"${PORT}" -sTCP:LISTEN >/dev/null 2>&1; return $?; fi | |
| return 1 | |
| } | |
| if port_busy; then | |
| # A Cadence backend already listening is fine — say so, don't start a second one. | |
| if curl -fsS -m 3 "http://127.0.0.1:${PORT}/healthz" >/dev/null 2>&1; then | |
| ok "Cadence is already running on http://localhost:${PORT}" | |
| echo | |
| echo " Open http://localhost:${PORT} — nothing else to do." | |
| echo " (Stop the old one first if you want a restart.)" | |
| exit 0 | |
| fi | |
| die "port ${PORT} is already used by another program." \ | |
| "Start Cadence on a different port: PORT=8010 bash run.sh" \ | |
| "See what holds it: lsof -iTCP:${PORT} -sTCP:LISTEN (or: ss -ltnp | grep ${PORT})" | |
| fi | |
| # ── 3. dependencies ────────────────────────────────────────────────────────── | |
| have_deps() { "$1" -c 'import flask, yt_dlp, ytmusicapi, requests' >/dev/null 2>&1; } | |
| PY=python3 | |
| if have_deps python3; then | |
| ok "dependencies already available" | |
| else | |
| bold "Installing dependencies (first run only)" | |
| if python3 -m pip install -q -r requirements.txt >/dev/null 2>&1 && have_deps python3; then | |
| ok "installed into system python" | |
| else | |
| # PEP 668 "externally managed" systems (Debian, Ubuntu, Homebrew) refuse system pip | |
| warn "system pip declined — using a local virtualenv in ./.venv" | |
| if [ ! -d .venv ]; then | |
| python3 -m venv .venv >/dev/null 2>&1 || die "could not create .venv" \ | |
| "Debian/Ubuntu: sudo apt install python3-venv then re-run: bash run.sh" \ | |
| "macOS: brew install python then re-run: bash run.sh" | |
| fi | |
| ./.venv/bin/pip install -q -r requirements.txt || die "pip install failed" \ | |
| "Check your internet connection, then re-run: bash run.sh" \ | |
| "Behind a proxy? export HTTPS_PROXY=http://host:port" | |
| have_deps ./.venv/bin/python || die "dependencies still missing after install" \ | |
| "Try: rm -rf .venv && bash run.sh" | |
| ok "installed into ./.venv" | |
| PY=./.venv/bin/python | |
| fi | |
| fi | |
| # ── 4. start ───────────────────────────────────────────────────────────────── | |
| bold "Starting Cadence on http://localhost:${PORT}" | |
| echo " (Ctrl+C stops it)" | |
| echo | |
| PORT="$PORT" exec "$PY" app.py | |