Update patch set from installer

ui/install

@@ -1,5 +1,6 @@
 #!/bin/bash
 # Rebuild custom UI files using patches
+# -u, --update to update the patch set with new changes
 
 GAME_PATH=/mnt/d/EverQuest
 UI_NAME=isuldor
@@ -21,6 +22,21 @@ fi
 SCRIPT_PATH=$(dirname ${0})
 UI_FOLDER="${GAME_PATH}/uifiles/${UI_NAME}"
 
+# We can update our patch set with changes
+if [[ "-u" == ${1} || "--update" == ${1} ]]
+then
+    echo "Updating patch set!"
+    rm -v "${SCRIPT_PATH}/EQUI_*.diff"
+    UI_FILES=( $( find "${UI_FOLDER}" -name '*.xml' -exec basename {} .xml \; ))
+    for UI_FILE in "${UI_FILES[@]}"
+    do
+        diff -u "${GAME_PATH}/uifiles/default/${UI_FILE}.xml" \
+            "${UI_FOLDER}/${UI_FILE}.xml" > ${SCRIPT_PATH}/${UI_FILE}.diff 
+    done
+    exit 0
+fi
+
+# Build custom UI directory
 mkdir -vp "${UI_FOLDER}"
 cp ${SCRIPT_PATH}/*.tga "${UI_FOLDER}/"