Description

This adds a path subcommand to the dart pub cache command which simply prints the effective pub cache path.

This is useful for determining the cache directory in effect when building CI rules.

For instance a Github action could now be created that looks like this:

      - name: Get pub cache path
        id: pub-cache
        run: echo "dir=$(dart pub cache path)" >> $GITHUB_OUTPUT
      - name: Cache Pub dependencies
        uses: actions/cache@v4
        with:
          path: ${{ steps.pub-cache.outputs.dir }}
          key: ${{ runner.os }}-pub-${{ hashFiles('**/pubspec.lock') }}
          restore-keys: ${{ runner.os }}-pub-

Otherwise, you have to know what the cache directory resolution scheme is on each platform, and the PUB_CACHE env var, and the path is platform specific.

It's also useful if an AI agent wants to know where the cache is.

Tests

• Added a test.