action.yml

name: Run what-rust-changed
description: Determines which rust projects in a workspace have changed
inputs:
  base:
    description: "The base ref to use for comparisons.  Usually the PR base or the before of a push"
    required: true
  config:
    description: "Optional config file for what-rust-changed"
    required: false
  version:
    description: "Which version of what-rust-changed to use.  The default should usually suffice"
    required: false
    default: "v0.1.0"
outputs:
  # These 2 are JSON lists (encoded as strings because github actions, sigh)
  blah:
    value: ${{ steps.what-rust-changed.outputs.rust }}
  changed-packages:
    description: A JSON list of the packages that have changed
    value: ${{ steps.what-rust-changed.outputs.changed-packages }}
  changed-binaries:
    description: A JSON list of the binaries that have changed
    value: ${{ steps.what-rust-changed.outputs.changed-binaries }}

  # These 4 are Strings
  cargo-build-specs:
    description: A string suitable for passing to cargo that builds all the changed packages
    value: ${{ steps.what-rust-changed.outputs.cargo-build-specs }}
  cargo-test-specs:
    description: A string suitable for passing to cargo test that includes all the changed packages but not the docker-tests
    value: ${{ steps.what-rust-changed.outputs.rust.cargo-test-specs }}
  cargo-docker-test-specs:
    description: A string suitable for passing to cargo test that includes all the changed packages including the docker-tests
    value: ${{ steps.what-rust-changed.outputs.cargo-docker-test-specs }}
  cargo-bin-specs:
    description: A string suitable for passing to cargo that builds all the changed binaries
    value: ${{ steps.what-rust-changed.outputs.cargo-bin-specs }}

runs:
  using: "composite"
  steps:
    - name: Cargo cache
      uses: actions/cache@v4
      continue-on-error: false
      with:
        key: what-rust-changed-${{ inputs.version }}
        save-always: true
        path: |
          ~/.local/what-rust-changed/

    # If you're iterating on this you may want to change this to a cargo install
    # while you work
    - name: Install what-rust-changed
      shell: bash
      run: |
        if [ ! -f ~/.local/what-rust-changed/what-rust-changed ]; then
          mkdir -p ~/.local/what-rust-changed
          curl -L https://github.com/grafbase/what-rust-changed/releases/download/${{ inputs.version }}/what-rust-changed-x86_64-unknown-linux-gnu.tar.gz --output ~/.local/what-rust-changed/wrc.tar.gz
          cd ~/.local/what-rust-changed
          tar xfv wrc.tar.gz
          rm wrc.tar.gz
        fi
        echo "$HOME/.local/what-rust-changed" >> $GITHUB_PATH

    - name: Run what-rust-changed
      id: what-rust-changed
      shell: bash
      env:
        WHAT_RUST_CHANGED_CONFIG: ${{ inputs.config }}
        BASE_REF: remotes/origin/${{ inputs.base }}
      run: |
        HEAD_REF=$(git rev-parse HEAD)
        set -euo pipefail
        echo "Head: $HEAD_REF"
        echo "Base: $BASE_REF"
        MERGE_BASE=$(git merge-base $BASE_REF $HEAD_REF)
        echo "Merge Base: $MERGE_BASE"
        git checkout $MERGE_BASE
        cargo metadata > /tmp/base.metadata.json
        git checkout $HEAD_REF
        cargo metadata --locked > /tmp/target.metadata.json
        CHANGED_FILES=$(git diff --no-commit-id --name-only -r $MERGE_BASE HEAD)
        CHANGES=$(echo $CHANGED_FILES | xargs what-rust-changed /tmp/base.metadata.json /tmp/target.metadata.json)
        echo "Changes: $CHANGES"

        echo "rust=$CHANGES" >> "$GITHUB_OUTPUT"

        echo "changed-packages=$(echo $CHANGES | jq -c .[\"changed-packages\"])" >> "$GITHUB_OUTPUT"
        echo "changed-binaries=$(echo $CHANGES | jq -c .[\"changed-binaries\"])" >> "$GITHUB_OUTPUT"

        echo "cargo-build-specs=$(echo $CHANGES | jq -r .[\"cargo-build-specs\"])" >> "$GITHUB_OUTPUT"
        echo "cargo-test-specs=$(echo $CHANGES | jq -r .[\"cargo-test-specs\"])" >> "$GITHUB_OUTPUT"
        echo "cargo-docker-test-specs=$(echo $CHANGES | jq -r .[\"cargo-docker-test-specs\"])" >> "$GITHUB_OUTPUT"
        echo "cargo-bin-specs=$(echo $CHANGES | jq -r .[\"cargo-bin-specs\"])" >> "$GITHUB_OUTPUT"

    - name: Debug shit
      shell: bash
      env:
        BLAH: ${{ steps.what-rust-changed.outputs.rust }}
      run: |
        echo $BLAH