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function git-branch-fzf() {
  local selected_branch=$(git for-each-ref --format='%(refname)' --sort=-committerdate refs/heads | perl -pne 's{^refs/heads/}{}' | fzf --query "$LBUFFER")

  if [ -n "$selected_branch" ]; then
    BUFFER="git checkout ${selected_branch}"
    zle accept-line
  fi

  zle reset-prompt
}

zle -N git-branch-fzf
bindkey "^b" git-branch-fzf