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git submodule add GIT_URL RELATIVE_PATH

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# Usage:
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#   git_lines
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#   git_lines -a author -d dir
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#
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# Install `gawk` first
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function git_lines {
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    local name=""
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    local dir=""
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    while getopts "a:d:" arg
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    do
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        case $arg in
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            a)
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                name=$OPTARG
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                ;;
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            d)
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                dir=$OPTARG
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                ;;
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            ?)
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                echo "unkonw argument"
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                exit 1
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                ;;
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        esac
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    done
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    if [ -z "$name" ]; then
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        name=$(git config user.name)
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    fi
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    if [ -z "$dir" ]; then
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        dir="."
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    fi
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    echo "User [\033[33m$name\033[0m] at [\033[32m$dir\033[0m]"
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    git log --author="$name" --pretty=tformat: --numstat -- $dir | gawk '{ add += $1 ; subs += $2 ; loc += $1 + $2 } END { printf "added lines: \033[34m%d\033[0m, removed lines: \033[31m%d\033[0m, total lines: \033[32m%d\033[0m\n", add, subs, loc }'
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}

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function git_first {
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    echo "Git First"
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    first_commit=$(git rev-list --max-parents=0 HEAD)
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    echo "Hash: [\033[33m$first_commit\033[0m]"
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    echo "Date: [\033[32m$(git show -s --format=%ci $first_commit)\033[0m]"
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    files_changed=$(git show --pretty="" --name-only $first_commit)
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    first_file=$(echo "$files_changed" | sed -n 1p)
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    echo "File: [\033[34m$first_file\033[0m]"
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    first_line=$(git show $first_commit:$first_file | head -1)
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    echo "Line: [\033[35m$first_line\033[0m]"
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}

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git checkout <commit_id> -- <folder_path>

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git log --oneline <file_path> | wc -l