Taskfile.yml

version: "3"

tasks:
  dev:
    desc: Run Vite with HMR and launch attn against the dev server
    vars:
      DEV_HOST_VALUE: '{{default "127.0.0.1" .DEV_HOST}}'
      DEV_PORT_VALUE: '{{default "auto" .DEV_PORT}}'
      ATTN_PATH_VALUE: '{{default "." .ATTN_PATH}}'
    cmds:
      - |
        bash -lc '
        set -euo pipefail

        DEV_HOST="{{.DEV_HOST_VALUE}}"
        DEV_PORT="{{.DEV_PORT_VALUE}}"
        ATTN_PATH="{{.ATTN_PATH_VALUE}}"

        choose_dev_port() {
          local start_port=5173
          local end_port=5273
          local candidate
          for candidate in $(seq "${start_port}" "${end_port}"); do
            if ! lsof -nP -iTCP:"${candidate}" -sTCP:LISTEN >/dev/null 2>&1; then
              echo "${candidate}"
              return 0
            fi
          done

          echo "Could not find a free development port in ${start_port}-${end_port}." >&2
          return 1
        }

        if [ "${DEV_PORT}" = "auto" ]; then
          DEV_PORT="$(choose_dev_port)"
        fi

        ATTN_DEV_SERVER_URL="http://${DEV_HOST}:${DEV_PORT}"

        cleanup() {
          if [ -n "${VITE_PID:-}" ] && kill -0 "${VITE_PID}" 2>/dev/null; then
            kill -TERM "${VITE_PID}" 2>/dev/null || true
            sleep 0.1
            kill -KILL "${VITE_PID}" 2>/dev/null || true
            wait "${VITE_PID}" 2>/dev/null || true
          fi
        }
        trap cleanup EXIT INT TERM

        # Install npm deps if missing
        if [ ! -d "web/node_modules" ]; then
          echo "==> Installing npm dependencies..."
          (cd web && npm ci)
        fi

        echo "Starting Vite dev server on ${ATTN_DEV_SERVER_URL}"
        (
          cd web
          exec ./node_modules/.bin/vite --host "${DEV_HOST}" --port "${DEV_PORT}" --strictPort
        ) &
        VITE_PID=$!

        # Give the spawned Vite process a moment to fail fast (for example, port in use).
        sleep 0.2
        if ! kill -0 "${VITE_PID}" 2>/dev/null; then
          echo "Vite failed to start on ${ATTN_DEV_SERVER_URL} (process exited early)." >&2
          echo "This usually means the port is already in use by another process." >&2
          wait "${VITE_PID}" || true
          exit 1
        fi

        echo "Waiting for Vite to be ready..."
        until curl -fsS "${ATTN_DEV_SERVER_URL}" >/dev/null 2>&1; do
          if ! kill -0 "${VITE_PID}" 2>/dev/null; then
            echo "Vite failed to start on ${ATTN_DEV_SERVER_URL}. Try: task dev DEV_PORT=5174" >&2
            wait "${VITE_PID}" || true
            exit 1
          fi
          sleep 0.2
        done

        echo "Launching attn with HMR enabled (path: ${ATTN_PATH})"
        ATTN_DEV_SERVER_URL="${ATTN_DEV_SERVER_URL}" cargo run -- --no-fork "${ATTN_PATH}"
        '