Git helper shell scripts for MarlinFirmware

Marlin/scripts/mfprune

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+#
+# mfprune
+#
+# Prune all your merged branches and any branches whose remotes are gone
+# Great way to clean up your branches after messing around a lot
+#
+
+echo "Pruning Merged Branches..."
+git branch --merged | egrep -v "^\*|RC|RCBugFix|dev" | xargs -n 1 git branch -d
+echo
+
+echo "Pruning Remotely-deleted Branches..."
+git branch -vv | egrep -v "^\*|RC|RCBugFix|dev" | grep ': gone]' | gawk '{print $1}' | xargs -n 1 git branch -D
+echo
+
+echo "You may want to remove these remote tracking references..."
+comm -23 \
+  <(git branch --all | sed 's/^[\* ] //' | grep origin/ | grep -v "\->" | awk '{ print $1; }' | sed 's/remotes\/origin\///') \
+  <(git branch --all | sed 's/^[\* ] //' | grep -v remotes/ | awk '{ print $1; }') \
+  | awk '{ print "git branch -d -r origin/" $1; }'
+echo