#!/bin/sh
obj_name="$1"
shift
git ls-files --stage \
    | if grep -q "$obj_name"; then
    echo Found in staging area. Run git ls-files --stage to see.
fi

git log "$@" --pretty=format:'%T %h %s' \
    | while read tree commit subject ; do
    if git ls-tree -r $tree | grep -q "$obj_name" ; then
        echo $commit "$subject"
    fi
done