Issue #110: automate execution by Github action bump-license-year.sh

.ci/bump-license-year.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -e
+
+PREV_YEAR=$1
+CURR_YEAR=$2
+DIR=$3
+
+OLD_VALUE="// Copyright (C) 2001-$PREV_YEAR the original author or authors."
+NEW_VALUE="// Copyright (C) 2001-$CURR_YEAR the original author or authors."
+
+find "$DIR" -type f \( -name *.java -o -name *.header -o -name *.g4 \) \
+  -exec sed -i "s|$OLD_VALUE|$NEW_VALUE|g" {} +
+
+BASEDIR=$(pwd)
+echo "Distinct Diff in $DIR is:"
+cd "$DIR"
+git diff | grep -Eh "^\+"  | grep -v "+++ b" | sort | uniq
+cd "$BASEDIR"

.github/workflows/bump-license-year.yml

@@ -0,0 +1,37 @@
+#############################################################################
+# GitHub Action to bump license year
+#
+# Workflow starts every new year.
+#
+#############################################################################
+name: "Bump license year"
+on:
+  schedule:
+    - cron: '0 12 1 1 *'
+permissions:
+  contents: write
+  pull-requests: write
+jobs:
+  bump:
+    name: Bump license year
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the latest code
+        uses: actions/checkout@v2
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set Current Year
+        id: CURRENT_YEAR
+        run: |
+          echo "::set-output name=year::$(date +'%Y')"
+      - name: Modify Files
+        run: |
+          ./.ci/bump-license-year.sh $(expr ${{ env.YEAR }} - 1) ${{ env.YEAR }} .
+        env:
+          YEAR: ${{ steps.CURRENT_YEAR.outputs.year }}
+      - name: Push commit
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email 'github-actions[bot]@users.noreply.github.com'
+          git commit -am "minor: Bump year to ${{ env.YEAR }}"
+          git push