two bash helper functions for searching git commit messages and commit history

search_git_log.sh

function commit_messages {
  if [ -z "$1" ]
  then
    echo "Please pass in a string to search for in all of this repository's log messages."
  else
    echo "Searching commit messages for \"$1\""
    git log --grep "$1" --all
  fi
}

function commit_history {
  if [ -z "$1" ]
  then
    echo "Please pass in a string to search for in all of this repository's commits."
  else
    echo "Searching commit history for \"$1\""
    git log -S "$1" --all
  fi
}