Add options in format-code.sh script

format-code.sh

@@ -1,13 +1,92 @@
 #!/usr/bin/env sh
+
+exit_whit_error_message() {
+  printf 'ERROR: %s\n' "$1" >&2
+  exit 1
+}
+
+show_warning_message() {
+  printf 'WARN: %s\n' "$1" >&2
+  exit 1
+}
+
+show_help() {
+  echo "The script to format all changed Java files, using the Google formatter."
+  echo
+  echo "Usage: ./format-code.sh [OPTIONS]"
+  echo 
+  echo "Options:"
+  echo "--version string       The version of the google java style formatter being used by the script. By default, the script uses the 1.7 version, " \ 
+       "to check the available versions, please, visit the google formatter repository at https://github.com/google/google-java-format"
+  echo "  Example: ./format-code.sh --version 1.7   # The script will execute using the 1.7 version of the formatter"
+  echo "           ./format-code.sh --version 1.10  # The script will execute using the 1.10 version of the formatter"
+  echo "--jvm-flags string  The flags to be defined when executing the JVM in the script. By default no flags are defined. "
+  echo "  Example: ./format-code.sh --jvm-flags \"-Xms1024M -Xmx2048M\"  # The JVM will execute with 1G of minimum heap memory and 2G at maximum"
+  echo
+}
+
+# Initialize all the option variables.
+# This ensures we are not contaminated by variables from the environment.
+VERSION=1.7
+JVM_FLAGS=
+
+while :; do
+  case $1 in
+    -h|-\?|--help)
+      show_help
+      exit
+      ;;
+    --version)
+      if [ "$2" ]; then
+        VERSION=$2
+        shift
+      else
+        exit_whit_error_message '"--version" requires a non-empty option argument.'
+      fi
+      ;;
+    --version=?*)
+       # Delete everything up to "=" and assign the remainder.
+      VERSION=${1#*=}
+      ;;
+    --version=) # Handle the case of an empty --version=
+      exit_whit_error_message '"--version" requires a non-empty option argument.'
+      ;;
+    --jvm-flags)
+      if [ "$2" ]; then
+        JVM_FLAGS=$2
+        shift
+      else
+        show_warning_message 'It was not defined any option for the --jvm-flags'
+      fi
+      ;;
+    --jvm-flags=?*)
+       # Delete everything up to "=" and assign the remainder.
+      JVM_FLAGS=${1#*=}
+      ;;
+    --jvm-flags=) # Handle the case of an empty --jvm-flags=
+      show_warning_message 'It was not defined any option for the --jvm-flags'
+      ;;
+    -?*)
+      show_warning_message "Unknown option (ignored): $1\n"
+      ;;
+    *)
+      # Default case: No more options, so break out of the loop.
+      break
+  esac
+
+  shift
+done
+
+
 mkdir -p .cache
 cd .cache
-if [ ! -f google-java-format-1.7-all-deps.jar ]
+if [ ! -f google-java-format-${VERSION}-all-deps.jar ]
 then
-    curl -LJO "https://github.com/google/google-java-format/releases/download/google-java-format-1.7/google-java-format-1.7-all-deps.jar"
-    chmod 755 google-java-format-1.7-all-deps.jar
+    curl -LJO "https://github.com/google/google-java-format/releases/download/google-java-format-${VERSION}/google-java-format-${VERSION}-all-deps.jar"
+    chmod 755 google-java-format-${VERSION}-all-deps.jar
 fi
 cd ..
 
 changed_java_files=$(git diff --cached --name-only --diff-filter=ACMR | grep ".*java$" )
 echo $changed_java_files
-java -jar .cache/google-java-format-1.7-all-deps.jar --replace $changed_java_files
+java $JVM_FLAGS -jar .cache/google-java-format-${VERSION}-all-deps.jar --replace $changed_java_files