git のコミットを検索して emacs で表示する

#!/bin/bash

[ -z `which emacsclient 2>&1` ] && { echo 'emacsclient not found' >&2; exit 1; }
[ -z `which git 2>&1` ] && { echo 'git not found' >&2; exit 1; }
[ -z `which peco 2>&1` ] && { echo 'peco not found' >&2; exit 1; }

function open_emacsclient {
  if [ $# -eq 0 ]; then
    TMP_FILE=`mktemp /tmp/emacsclient.XXXXXX`
    cat > $TMP_FILE
    sexp=$(cat <<EOF
      (let ((b (create-file-buffer "*stdin*")))
        (switch-to-buffer b)
        (insert-file-contents "${TMP_FILE}")
        (delete-file "${TMP_FILE}")
        (diff-mode))
EOF
    )
    emacsclient -a emacs -e "$sexp"
  fi
}

# copy from https://gist.github.com/fukajun/edea3c4f36e37bf36e8b
hash=`git log --graph --pretty=format:'%d %an: %s %ar %h' | peco | awk -F ' ' '{ print $NF }'`
git show $hash | open_emacsclient
exit 0