# TRIGGER: Runs on any push to oldest branch.
# ACTION: Builds and tests with stack and the oldest supported ghc.

name: oldest

on:
  # When there's a push to the oldest branch, it runs in that branch.
  push:
    branches: [ oldest ]
  # If manually triggered in github ui, it runs in master.
  workflow_dispatch:

jobs:
  oldest:
    runs-on: ubuntu-24.04
    env:
      # This workflow uses github's preinstalled ghc & stack on ubuntu.
      # Keep these synced with the latest ghc version at https://github.com/actions/runner-images/blob/ubuntu22/20240514.2/images/ubuntu/Ubuntu2404-Readme.md#haskell-tools
      #
      # caching id for this ghc's build artifacts:
      # XXX supposed to be interpolated by $ghc below, but this is not working
      ghc: 8107
      # stack config for this ghc:
      stack: stack --stack-yaml=stack810.yaml

    steps:

    - name: Check out
      uses: actions/checkout@v4
      # have to fetch everything for git describe for hledger's --version
      with:
        fetch-depth: 0


    # CACHES

    - name: Cache - stack global package db
      id:   stack-global
      uses: actions/cache@v4
      with:
        path: ~/.stack
        # XXX if stack.yaml is a symlink, this fails with
        #  Error: The template is not valid. .github/workflows/push.yml (Line: 103, Col: 14): hashFiles('**.yaml') failed.
        #  Fail to hash files under directory '/home/runner/work/hledger/hledger'
        key: ${{ runner.os }}-stack-global-$ghc-${{ hashFiles('**.yaml') }}
        restore-keys: |
             ${{ runner.os }}-stack-global-$ghc

    - name: Cache - stack-installed programs in ~/.local/bin
      id:   stack-programs
      uses: actions/cache@v4
      with:
        path: ~/.local/bin
        key: ${{ runner.os }}-stack-programs-$ghc-${{ hashFiles('**.yaml') }}
        restore-keys: |
             ${{ runner.os }}-stack-programs-$ghc

    - name: Cache - .stack-work
      uses: actions/cache@v4
      with:
        path: .stack-work
        key: ${{ runner.os }}-stack-work-$ghc-${{ hashFiles('**.yaml') }}
        restore-keys: |
             ${{ runner.os }}-stack-work-$ghc

    - name: Cache - hledger-lib/.stack-work
      uses: actions/cache@v4
      with:
        path: hledger-lib/.stack-work
        key: ${{ runner.os }}-hledger-lib-stack-work-$ghc-${{ hashFiles('hledger-lib/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-lib-stack-work-$ghc

    - name: Cache - hledger/.stack-work
      uses: actions/cache@v4
      with:
        path: hledger/.stack-work
        key: ${{ runner.os }}-hledger-stack-work-$ghc-${{ hashFiles('hledger/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-stack-work-$ghc

    - name: Cache - hledger-ui/.stack-work
      uses: actions/cache@v4
      with:
        path: hledger-ui/.stack-work
        key: ${{ runner.os }}-hledger-ui-stack-work-$ghc-${{ hashFiles('hledger-ui/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-ui-stack-work-$ghc

    - name: Cache - hledger-web/.stack-work
      uses: actions/cache@v4
      with:
        path: hledger-web/.stack-work
        key: ${{ runner.os }}-hledger-web-stack-work-$ghc-${{ hashFiles('hledger-web/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-web-stack-work-$ghc


    # ACTIONS
    # in modular steps for faster & more focussed failures

    - name: Install GHC
      run: |
        $stack setup --install-ghc


    - name: Build deps of hledger-lib
      run: |
        $stack build --test --bench hledger-lib --only-dependencies

    - name: Build/test    hledger-lib
      run: |
        $stack install --test --bench hledger-lib --fast --ghc-options=-Werror


    - name: Build deps of hledger
      run: |
        $stack build --test --bench hledger --only-dependencies

    - name: Build/test    hledger
      run: |
        $stack install --test --bench hledger --fast --ghc-options=-Werror


    - name: Build deps of hledger-ui
      run: |
        $stack build --test --bench hledger-ui --only-dependencies

    - name: Build/test    hledger-ui
      run: |
        $stack install --test --bench hledger-ui --fast --ghc-options=-Werror


    - name: Build deps of hledger-web
      run: |
        $stack build --test --bench hledger-web --only-dependencies

    - name: Build/test    hledger-web
      run: |
        $stack install --test --bench hledger-web --fast --ghc-options=-Werror

    # XXX disable until this is fixed: shelltestrunner-1.10/src/shelltest.hs:125:20: error:
    # shelltestrunner      >     Not in scope: ‘configFailFast’
    # shelltestrunner      >     Perhaps you meant ‘configFastFail’ (imported from Test.Hspec.Core.Runner)

    # - name: Install shelltestrunner
    #   run: |
    #     export PATH=~/.local/bin:$PATH
    #     if [[ ! -x ~/.local/bin/shelltest ]]; then $stack install shelltestrunner-1.10; fi
    #     shelltest --version

    # - name: Test functional tests (excluding addons)
    #   run: |
    #     export PATH=~/.local/bin:$PATH
    #     COLUMNS=80 $stack exec -- shelltest --execdir -j16 hledger/test -x /_ -x /addons -x ledger-compat/ledger-baseline -x ledger-compat/ledger-regress -x ledger-compat/ledger-collected
    #     # XXX run the bin/ func tests corresponding to the GHC version enabled above, only