this is to be used in actions to auto increment flutter version in pubspec.yaml file

auto-increment-flutter-version.sh

# Set this to "major", "minor", or "patch" to control which part of the version is incremented.
# call this file with VERSION_INCREMENT as argument or if running manually, uncomment 
# VERSION_INCREMENT="major"

# Check if VERSION_INCREMENT is set and non-empty
if [[ -z "${VERSION_INCREMENT}" ]]; then
  echo "VERSION_INCREMENT variable is not set, exiting."
  exit 1
fi

CURRENT_VERSION=$(grep 'version:' pubspec.yaml | awk '{print $2}')

  # Split the version string into version and versionCode using '+' as the delimiter.
IFS='+' read -ra VERSION <<< "$CURRENT_VERSION"

# Split the version into an array using '.' as the delimiter.
IFS='.' read -ra VERSION_PARTS <<< "${VERSION[0]}"  

echo "CURRENT_VERSION: ${CURRENT_VERSION}"
echo "IFS value: ${IFS}"
echo "VERSION_PARTS: ${VERSION_PARTS[0]} ${VERSION_PARTS[1]} ${VERSION_PARTS[2]}"


case $VERSION_INCREMENT in
"major")
    VERSION_PARTS[0]=$((VERSION_PARTS[0] + 1))
    VERSION_PARTS[1]=0
    VERSION_PARTS[2]=0
    ;;
"minor")
    VERSION_PARTS[1]=$((VERSION_PARTS[1] + 1))
    VERSION_PARTS[2]=0
    ;;
"patch")
    VERSION_PARTS[2]=$((VERSION_PARTS[2] + 1))
    ;;
esac

VERSION_CODE=$((VERSION_PARTS[0]*10000 + VERSION_PARTS[1]*1000 + VERSION_PARTS[2] ))
NEW_VERSION="${VERSION_PARTS[0]}.${VERSION_PARTS[1]}.${VERSION_PARTS[2]}+$VERSION_CODE"
echo "New version: $NEW_VERSION"
sed -i -e "/version:/c\version: $NEW_VERSION" pubspec.yaml