gj.bash

#!/bin/bash
 
MAXBRANCHES=30
 
function __list {
  git reflog | grep ': checkout:' | awk '{print $8}' | grep -v submit_branch | uniq | head -$MAXBRANCHES | sort | uniq -c | sort -nr | awk '{print $2}' | cat -n
}
 
git branch 2>&1 > /dev/null || exit 1
 
CUR_BRANCH=`git branch | egrep '^\* ' | cut -d' ' -f2`
 
if [ "$1" == "" ]; then
  echo "On $CUR_BRANCH" 1>&2
  echo "Popular recent branches:" 1>&2
  __list
else
  NEWBR=`__list | head -n $1 | tail -1 | awk '{print $2}'`
  git checkout $NEWBR
fi