# Copyright 2019-2023 Tauri Programme within The Commons Conservancy
# SPDX-License-Identifier: Apache-2.0
# SPDX-License-Identifier: MIT

name: setup pnpm
description: Installs Node.js, pnpm and the workspace dependencies, restoring the pnpm store from the cache

# `pnpm/action-setup`'s own cache saves from every run, pull requests included. An entry saved from
# a pull request lives on its merge ref, where nothing else can restore it, and every write evicts
# an entry that other runs would have hit (10 GB repository limit, LRU eviction), so here every run
# restores the store and only `v2`/`v3` save it.
runs:
  using: composite
  steps:
    - uses: actions/setup-node@v7
      with:
        node-version: 'lts/*'

    - uses: pnpm/action-setup@v6

    - id: store
      shell: bash
      run: echo "path=$(pnpm store path --silent)" >> "$GITHUB_OUTPUT"

    - id: cache
      uses: actions/cache/restore@v6
      with:
        path: ${{ steps.store.outputs.path }}
        key: pnpm-store-${{ runner.os }}-${{ runner.arch }}-${{ hashFiles('pnpm-lock.yaml') }}
        restore-keys: pnpm-store-${{ runner.os }}-${{ runner.arch }}-

    - shell: bash
      run: pnpm install --frozen-lockfile

    # a store restored from an older lockfile still holds the packages it no longer uses
    - if: ${{ (github.ref == 'refs/heads/v2' || github.ref == 'refs/heads/v3') && steps.cache.outputs.cache-hit != 'true' }}
      shell: bash
      run: pnpm store prune

    - if: ${{ (github.ref == 'refs/heads/v2' || github.ref == 'refs/heads/v3') && steps.cache.outputs.cache-hit != 'true' }}
      uses: actions/cache/save@v6
      with:
        path: ${{ steps.store.outputs.path }}
        key: ${{ steps.cache.outputs.cache-primary-key }}