Add script to update all local branches

.bin/git-ffwd-update

@@ -0,0 +1,35 @@
+#!/bin/bash
+# src: https://stackoverflow.com/a/9076361
+
+main() {
+  REMOTES="$@";
+  if [ -z "$REMOTES" ]; then
+    REMOTES=$(git remote);
+  fi
+  REMOTES=$(echo "$REMOTES" | xargs -n1 echo)
+  CLB=$(git rev-parse --abbrev-ref HEAD);
+  echo "$REMOTES" | while read REMOTE; do
+    git remote update $REMOTE
+    git remote show $REMOTE -n \
+    | awk '/merges with remote/{print $5" "$1}' \
+    | while read RB LB; do
+      ARB="refs/remotes/$REMOTE/$RB";
+      ALB="refs/heads/$LB";
+      NBEHIND=$(( $(git rev-list --count $ALB..$ARB 2>/dev/null) +0));
+      NAHEAD=$(( $(git rev-list --count $ARB..$ALB 2>/dev/null) +0));
+      if [ "$NBEHIND" -gt 0 ]; then
+        if [ "$NAHEAD" -gt 0 ]; then
+          echo " branch $LB is $NBEHIND commit(s) behind and $NAHEAD commit(s) ahead of $REMOTE/$RB. could not be fast-forwarded";
+        elif [ "$LB" = "$CLB" ]; then
+          echo " branch $LB was $NBEHIND commit(s) behind of $REMOTE/$RB. fast-forward merge";
+          git merge -q $ARB;
+        else
+          echo " branch $LB was $NBEHIND commit(s) behind of $REMOTE/$RB. resetting local branch to remote";
+          git branch -f $LB -t $ARB >/dev/null;
+        fi
+      fi
+    done
+  done
+}
+
+main $@