prompt user if repo has changes before upgrading

tools/upgrade.sh

@@ -20,10 +20,7 @@ else
   NORMAL=""
 fi
 
-printf "${BLUE}%s${NORMAL}\n" "Updating Oh My Zsh"
-cd "$ZSH"
-if git pull --rebase --stat origin master
-then
+success_upgrading() {
   printf '%s' "$GREEN"
   printf '%s\n' '         __                                     __   '
   printf '%s\n' '  ____  / /_     ____ ___  __  __   ____  _____/ /_  '
@@ -34,6 +31,38 @@ then
   printf "${BLUE}%s\n" "Hooray! Oh My Zsh has been updated and/or is at the current version."
   printf "${BLUE}${BOLD}%s${NORMAL}\n" "To keep up on the latest news and updates, follow us on twitter: https://twitter.com/ohmyzsh"
   printf "${BLUE}${BOLD}%s${NORMAL}\n" "Get your Oh My Zsh swag at:  http://shop.planetargon.com/"
-else
+  exit 0
+}
+
+error_upgrading() {
   printf "${RED}%s${NORMAL}\n" 'There was an error updating. Try again later?'
+  exit 1
+}
+
+run_upgrade() {
+  if git pull --rebase --stat origin master
+  then
+    success_updating
+  else
+    error_updating
+  fi
+}
+
+printf "${BLUE}%s${NORMAL}\n" "Updating Oh My Zsh"
+cd "$ZSH"
+
+if output=$(git status --porcelain); then
+  while true; do
+    printf "${RED}%s${NORMAL}\n" "You have changes that are preventing Oh My Zsh from upgrading."
+    printf "${RED}%s${NORMAL}" "Do you want to stash these changes and continue? "
+    read -p "" answer
+    case $answer in
+      [Yy]* ) git stash; run_update;;
+      [Nn]* ) exit;;
+      * ) echo "Please answer yes or no.";;
+    esac
+  done
+else
+  run_update
 fi
+