branchを最終更新順に並べてpecoで選択してcheckoutする

peco-select-branch.sh

function peco-switch-branch() {
  local branch=$(
    (
      for i in `git branch | colrm 1 2|grep -v detached`;
      do
        echo `git log --date=iso8601 -n 1 --pretty="format:[%ai] %h" $i` $i;
        done
    ) | sort -r|peco --query "$LBUFFER" | cut -f 5 -d" ")
  if [ -n "$branch" ]; then
    BUFFER="git checkout ${branch}"
    CURSOR=$#BUFFER
    zle accept-line
  fi
  zle clear-screen
}
zle -N peco-switch-branch
bindkey '^x^b' peco-switch-branch

元ネタは http://d.hatena.ne.jp/kazuhooku/20130205/1360039870 です