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buildroot/share/git/mfclean

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+#!/usr/bin/env bash
+#
+# mfclean
+#
+# Prune all your merged branches and any branches whose remotes are gone
+# Great way to clean up your branches after messing around a lot
+#
+
+KEEP="RC|RCBugFix|dev|master|bugfix-1|bugfix-2"
+
+echo "Fetching latest upstream and origin..."
+git fetch upstream
+git fetch origin
+echo
+
+echo "Pruning Merged Branches..."
+git branch --merged | egrep -v "^\*|$KEEP" | xargs -n 1 git branch -d
+echo
+
+echo "Pruning Remotely-deleted Branches..."
+git branch -vv | egrep -v "^\*|$KEEP" | grep ': gone]' | gawk '{print $1}' | xargs -n 1 git branch -D
+echo
+
+# List fork branches that don't match local branches
+echo "You may want to remove (or checkout) these refs..."
+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; print "git checkout origin/" $1 " -b " $1; print ""; }'
+echo