Add Github Action and CI (#1)

.github/workflows/ci.yml

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+name: ci
+
+on: [push, pull_request]
+
+jobs:
+
+  test-action:
+
+    name: Test Github Action
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: List prerequisites non-recursively
+      id: non-recursive-prerequisites
+      uses: ./
+      with:
+        working-directory: test
+        target: test
+    - name: Check non-recursive prerequisites
+      run: |
+        test "${{ steps.non-recursive-prerequisites.outputs.prerequisites }}" = "prereq"
+        echo ${{ steps.non-recursive-prerequisites.outputs.hash }}
+    - name: List recursive prerequisites
+      id: recursive-prerequisites
+      uses: ./
+      with:
+        working-directory: test
+        target: test
+        flags: --recursive
+    - name: Check recursive prerequisites
+      run: |
+        test "${{ steps.recursive-prerequisites.outputs.prerequisites }}" = "preprereq"
+        echo ${{ steps.recursive-prerequisites.outputs.hash }}

action.yml

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+name: "List Make Prerequisites Action"
+description: "List all prerequisites of a Makefile target"
+author: "Luca Colagrande"
+
+inputs:
+  target:
+    description: "Target to list prerequisites for"
+    required: true
+  working-directory:
+    description: "Working directory to run Make in"
+    required: false
+    default: '.'
+  flags:
+    description: "Additional flags to pass to list-make-prerequisites.py"
+    required: false
+    default: ''
+
+outputs:
+  hash:
+    description: "Hash of all prerequisite file contents"
+    value: ${{ steps.list-make-prerequisites.outputs.hash }}
+  prerequisites:
+    description: "List of all prerequisite files"
+    value: ${{ steps.list-make-prerequisites.outputs.prerequisites }}
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.10'
+    - name: Install Dependencies
+      shell: bash
+      run: pip install -r requirements.txt
+    - name: List Make Prerequisites
+      id: list-make-prerequisites
+      shell: bash
+      working-directory: ${{ inputs.working-directory }}
+      run: |
+        hash=$(${GITHUB_ACTION_PATH}/list-make-prerequisites.py ${{ inputs.target }} ${{ inputs.flags }} --hash 2>/dev/null)
+        prerequisites=$(${GITHUB_ACTION_PATH}/list-make-prerequisites.py ${{ inputs.target }} ${{ inputs.flags }} 2>/dev/null)
+        echo "hash=$hash" >> $GITHUB_OUTPUT
+        echo "prerequisites=$prerequisites" >> $GITHUB_OUTPUT

requirements.txt

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+anytree

test/Makefile

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+test: prereq
+	cp $< $@
+
+prereq: preprereq
+	cp $< $@

test/preprereq

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+Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.