Add script for bumping CHANGELOGS post-release

Author: Lucsanszky

Diff for: scripts/bump-changelogs.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+
+CHAP=./cardano-haskell-packages
+# Download a shallow copy of CHaP
+git clone --depth 1 [email protected]:IntersectMBO/cardano-haskell-packages.git $CHAP
+
+cd $CHAP || exit
+# Save all the available packages from CHaP
+CHAP_PACKAGES=$(./scripts/list-packages.sh)
+cd - || exit
+echo "The following packages are available in CHaP:"
+echo "$CHAP_PACKAGES"
+
+# Save the paths to every `cardano-ledger` cabal file
+CABAL_FILES=$(find . -wholename '*/eras/*.cabal' -o -wholename '*/libs/*.cabal')
+
+for i in $CABAL_FILES;
+do
+  # Extract the name of the package (without the path and the extension)
+  PACKAGE=$(basename "$i" .cabal)
+  # Construct the path to the package's `CHANGELOG`
+  CHANGELOG=${i/$PACKAGE.cabal/CHANGELOG.md}
+
+  # Check if package has a `CHANGELOG`
+  if [[ -f "$CHANGELOG" ]]; then
+    # Get the most recent version number in the `CHANGELOG`
+    VERSION=$(grep -m 1 -o "[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9]\+" "$CHANGELOG")
+
+    # Check if the package had a release with
+    # the most recent `CHANGELOG` version number
+    printf "Looking for %s with version %s in CHaP\n" "$PACKAGE" "$VERSION"
+    RESULT=$(echo "$CHAP_PACKAGES" | grep -o "$PACKAGE $VERSION")
+    if [[ -n "$RESULT" ]]; then
+      # A release was found and thus the `CHANGELOG` has to be bumped
+      # with the incremented patch version
+      NEXT_VERSION=$(echo "$VERSION" | awk -F. -v OFS=. '{$NF += 1 ; print}')
+      printf "Bumping %s to %s\n" "$CHANGELOG" "$NEXT_VERSION"
+      sed -i "s/## $VERSION/## $NEXT_VERSION\n\n*\n\n## $VERSION/" "$CHANGELOG"
+    fi
+  fi
+done
+
+rm -rf $CHAP