Simplify bump-version.sh changelog update to use sed

Author: nrbrook

scripts/bump-version.sh

@@ -109,26 +109,12 @@ if [[ $REPLY =~ ^[Yy]$ ]]; then
         fi
     fi
 
-    # Update CHANGELOG.md: insert new version after [Unreleased]
-    # Uses awk to properly consume blank lines after [Unreleased] to prevent double-spacing
+    # Update CHANGELOG.md: rename [Unreleased] to new version with date
     TODAY=$(date +%Y-%m-%d)
-    awk -v ver="$NEW_VERSION" -v date="$TODAY" '
-        /^## \[Unreleased\]/ {
-            print
-            print ""
-            print "## [" ver "] - " date
-            # Skip any blank lines that follow [Unreleased]
-            while ((getline next_line) > 0 && next_line ~ /^[[:space:]]*$/) {}
-            # Print blank line then the first non-blank line we found
-            if (next_line !~ /^[[:space:]]*$/) print ""
-            if (next_line !~ /^[[:space:]]*$/) print next_line
-            next
-        }
-        { print }
-    ' CHANGELOG.md > CHANGELOG.md.tmp && mv CHANGELOG.md.tmp CHANGELOG.md
+    # BSD sed doesn't interpret \n, so use literal newlines via $'' quoting
+    sed -i '' $'s/## \\[Unreleased\\]/## [Unreleased]\\\n\\\n## ['"$NEW_VERSION"$'] - '"$TODAY"$'/' CHANGELOG.md
 
     # Add new comparison link and update Unreleased link
-    # BSD sed doesn't interpret \n, so use literal newlines via $'' quoting
     sed -i '' $'s|\\[Unreleased\\]: \\(.*\\)/compare/v.*\\.\\.\\.HEAD|[Unreleased]: \\1/compare/v'"$NEW_VERSION"$'...HEAD\\\n['"$NEW_VERSION"$']: \\1/compare/v'"$CURRENT_VERSION"$'...v'"$NEW_VERSION"$'|' CHANGELOG.md
     echo "✓ Updated CHANGELOG.md"
 
@@ -149,4 +135,4 @@ else
     echo "  git commit -m 'Bump version to $NEW_VERSION'"
     echo "  git tag -a v$NEW_VERSION -m 'Release v$NEW_VERSION'"
     echo "  git push && git push origin v$NEW_VERSION"
-fi
+fi