# Runs after notable pushes to the branches listed below.
# master is configured to require one or more status checks corresponding to
# enabled matrix plans below (shown in github UI as "build (810, ...").
# So the push process is:
# 1. push new commits to a personal test branch listed below (simon)
# 2. this workflow runs, wait for it to succeed, then
# 3. push the same commits to master, which will now allow it.
#
# Builds unoptimised on x64 linux and runs functional tests,
# using the GHC version(s) enabled below.

name: push CI

on:
  push:
    branches: [ simon ]
    # Run this workflow for changes to any file, even trivial doc fixes
    # (since merging to master requires a successful run).
    # Ideally caching will keep it relatively cheap; avoid over-pushing.

    # Run this workflow only for changes to these files (to avoid waste):
    # paths:
    #   - '.github/workflows/push.yml'
    #   - 'stack*.yaml'
    #   - 'hledger-lib/**'
    #   - 'hledger/**'
    #   - 'hledger-ui/**'
    #   - 'hledger-web/**'
    #   - 'bin/*.hs'
    #   - 'examples/**'
    #   # and ignore these files:   (XXX it would still be nice to check the commit messages)
    #   # examples
    #   - '!**.journal'
    #   - '!**.j'
    #   - '!**.ledger'
    #   - '!**.csv'
    #   # docs
    #   - '!**.m4'
    #   - '!**.md'
    #   - '!**.1'
    #   - '!**.5'
    #   - '!**.info'
    #   - '!**.txt'

  # also allow this workflow to be triggered manually
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        plan:  # at least the check(s) required by master should be enabled
        - { ghc: "86" , stack: "stack --stack-yaml=stack8.6.yaml" }
        # - { ghc: "88" , stack: "stack --stack-yaml=stack8.8.yaml" }
        # - { ghc: "810", stack: "stack --stack-yaml=stack8.10.yaml" }
        # - { ghc: "90" , stack: "stack --stack-yaml=stack.yaml" }
        # - { ghc: "92" , stack: "stack --stack-yaml=stack9.2.yaml" }

    steps:

    - name: Check out
      uses: actions/checkout@v2
      # have to fetch everything for git describe for --version
      with: 
        fetch-depth: 0        

    # - name: Print debug output
    #   env:
    #     GITHUB_CONTEXT: ${{ toJson(github) }}
    #   run: |
    #     echo

    #     echo "$GITHUB_SHA"
    #     echo "$GITHUB_REF"
    #     echo "$GITHUB_HEAD_REF"
    #     echo "$GITHUB_BASE_REF"
    #     git log "$GITHUB_BASE_REF"..
    #     tools/commitlint "$GITHUB_BASE_REF"..

    # keep synced in all workflows which do this
    - name: Check commit messages
      # For a PR, the range will be: master..origin/$GITHUB_HEAD_REF
      # For a push it will be: $BEFORE..
      # For a force push, BEFORE is the previous HEAD, and on github (though not locally) this is an "invalid revision range".
      # In this and any case where the range is invalid, we'll just skip the check, to avoid false positives
      # related: https://stackoverflow.com/questions/64708371/how-to-run-github-workflow-on-every-commit-of-a-push
      env:
        BEFORE: ${{ github.event.before }}
        # NUM:    5
      shell: bash
      run: |
        RANGE=${BEFORE:-origin/master}..${GITHUB_HEAD_REF:-}

        echo "debug: last 10 commits:"
        echo "debug:  $(git log --format='%h -%d %s (%an, %ci)' -10)"
        echo "debug: origin/master:"
        echo "debug:  $(git log --format='%h -%d %s (%an, %ci)' -1 origin/master)"
        echo "debug: BEFORE=$BEFORE"
        echo "debug:  $(git log --format='%h -%d %s (%an, %ci)' -1 $BEFORE)"
        echo "debug: GITHUB_HEAD_REF=$GITHUB_HEAD_REF"
        echo "debug:  $(git log --format='%h -%d %s (%an, %ci)' -1 $GITHUB_HEAD_REF)"
        echo "debug: RANGE(commits to check)=$RANGE"
        echo "debug:  $(git log --format='%h -%d %s (%an, %ci)' --abbrev-commit --date=relative --date-order $RANGE)"

        if git rev-list --quiet $RANGE
        then tools/commitlint $RANGE
        else echo "could not identify commits, not checking them"
        fi

    - name: Skip remaining steps if last commit message begins with ;
      shell: bash
      run: |
        echo "git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog"
        (git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog \
          && (grep -qE '^ *;' $$.gitlog || echo "CONTINUE=true" >> $GITHUB_ENV)) \
          || ( echo "could not identify commit range, continuing CI steps"; echo "CONTINUE=true" >> $GITHUB_ENV )

    # things to be cached/restored:

    - name: Cache stack global package db
      id:   stack-global
      uses: actions/cache@v2
      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: ${{ runner.os }}-stack-global-${{ matrix.plan.ghc }}-${{ hashFiles('**.yaml') }}
        restore-keys: |
             ${{ runner.os }}-stack-global-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    - name: Cache stack-installed programs in ~/.local/bin
      id:   stack-programs
      uses: actions/cache@v2
      with:
        path: ~/.local/bin
        key: ${{ runner.os }}-stack-programs-${{ matrix.plan.ghc }}-${{ hashFiles('**.yaml') }}
        restore-keys: |
             ${{ runner.os }}-stack-programs-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    - name: Cache .stack-work
      uses: actions/cache@v2
      with:
        path: .stack-work
        key: ${{ runner.os }}-stack-work-${{ matrix.plan.ghc }}-${{ hashFiles('**.yaml') }}
        restore-keys: |
             ${{ runner.os }}-stack-work-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    - name: Cache hledger-lib/.stack-work
      uses: actions/cache@v2
      with:
        path: hledger-lib/.stack-work
        key: ${{ runner.os }}-hledger-lib-stack-work-${{ matrix.plan.ghc }}-${{ hashFiles('hledger-lib/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-lib-stack-work-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    - name: Cache hledger/.stack-work
      uses: actions/cache@v2
      with:
        path: hledger/.stack-work
        key: ${{ runner.os }}-hledger-stack-work-${{ matrix.plan.ghc }}-${{ hashFiles('hledger/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-stack-work-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    - name: Cache hledger-ui/.stack-work
      uses: actions/cache@v2
      with:
        path: hledger-ui/.stack-work
        key: ${{ runner.os }}-hledger-ui-stack-work-${{ matrix.plan.ghc }}-${{ hashFiles('hledger-ui/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-ui-stack-work-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    - name: Cache hledger-web/.stack-work
      uses: actions/cache@v2
      with:
        path: hledger-web/.stack-work
        key: ${{ runner.os }}-hledger-web-stack-work-${{ matrix.plan.ghc }}-${{ hashFiles('hledger-web/package.yaml') }}
        restore-keys: |
             ${{ runner.os }}-hledger-web-stack-work-${{ matrix.plan.ghc }}
      if: env.CONTINUE

    # actions:

    - name: Install stack
      run: |
        mkdir -p ~/.local/bin
        export PATH=~/.local/bin:$PATH
        # curl -sL https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'; chmod a+x ~/.local/bin/stack
        if [[ ! -x ~/.local/bin/stack ]]; then curl -sL https://get.haskellstack.org/stable/linux-x86_64.tar.gz | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'; chmod a+x ~/.local/bin/stack; fi
        stack --version
      if: env.CONTINUE

    - name: Install GHC
      env:
        stack: ${{ matrix.plan.stack }}
      run: |
        $stack setup --install-ghc
      if: env.CONTINUE

    - name: Install haskell deps
      env:
        stack: ${{ matrix.plan.stack }}
      run: |
        $stack build --only-dependencies
      if: env.CONTINUE

    - name: Build hledger fast
      env:
        stack: ${{ matrix.plan.stack }}
      run: |
        $stack build --fast --ghc-options=-Werror --force-dirty
        # --ghc-options=-fforce-recomp   # needed occasionally to clear out stale compiled modules
        #  --pedantic
      if: env.CONTINUE

    - name: Install shelltestrunner
      env:
        stack: ${{ matrix.plan.stack }}
      run: |
        export PATH=~/.local/bin:$PATH
        if [[ ! -x ~/.local/bin/shelltest ]]; then $stack install shelltestrunner-1.9; fi
        shelltest --version
      if: env.CONTINUE

    - name: Test functional tests (excluding addons)
      env:
        stack: ${{ matrix.plan.stack }}
      run: |
        export PATH=~/.local/bin:$PATH
        COLUMNS=80 $stack exec -- shelltest --execdir -j16 hledger/test -x /_ -x /addons  #  bin
        # XXX func tests in bin are run only with GHC 8.2 for now
      if: env.CONTINUE