# select history
function exists { which $1 &> /dev/null }
function peco-select-history() {
    local tac
    exists gtac && tac="gtac" || { exists tac && tac="tac" || { tac="tail -r" } }
    BUFFER=$(fc -l -n 1 | eval $tac | peco --query "$LBUFFER")
    CURSOR=$#BUFFER         # move cursor
    zle -R -c               # refresh
}

zle -N peco-select-history
bindkey '^R' peco-select-history