bash function to open files modified in a git commit in vim tabs

virev.sh

# Open files modified in a git commit in vim tabs; defaults to HEAD. Pop it in your .bashrc
# Examples: 
#     virev 49808d5
#     virev HEAD~3
function virev {
    commit=$1
    if [ -z "${commit}" ]; then
      commit="HEAD"
    fi
    rootdir=$(git rev-parse --show-toplevel)
    sourceFiles=$(git show --name-only --pretty="format:" ${commit} | grep -v '^$')
    toOpen=""
    for file in ${sourceFiles}; do
      file="${rootdir}/${file}"
      if [ -e "${file}" ]; then
        toOpen="${toOpen} ${file}"
      fi
    done
    if [ -z "${toOpen}" ]; then
      echo "No files were modified in ${commit}"
      return 1
    fi
    vim -p ${toOpen}
}