git-sgrep

#!/bin/bash -e
USAGE='git sgrep [<options>] [-e] <pattern> [<rev>...] [[--] <path>...]'
NONGIT_OK=1
SUBDIRECTORY_OK=1
. "$(git --exec-path)/git-sh-setup"

declare -a opts=() patterns=() revpaths=()
git config --get-colorbool diff && opts+=(--color=always) || opts+=(--color=never)
while (($#)); do
    arg=$1; shift
    case "$arg" in
        -e|-f)
            (($#)) || die "error: switch \`$arg' requires a value"
            patterns+=("$arg" "$1")
            shift
            ;;
        --and|--or|--not)
            patterns+=("$arg")
            ;;
        \()
            lvl=1 patterns+=("$arg")
            while (($#)); do
                arg=$1; shift
                patterns+=("$arg")
                if [[ $arg = '(' ]]; then
                    ((++lvl))
                elif [[ $arg = ')' ]] && ((--lvl<1)); then
                    break
                fi
            done
            ((lvl<1)) || die 'fatal: unmatched parenthesis'
            ;;
        --)
            revpaths+=(-- "$@")
            set --
            ;;
        --color=auto)
            if [[ -t $1 ]]; then
                opts+=(--color=always)
            else
                opts+=(--color=never)
            fi
            ;;
        -*)
            opts+=("$arg")
            ;;
        *)
            if ((${#patterns[*]})); then
                revpaths+=("$arg")
            else
                patterns+=("$arg")
            fi
    esac
done

((${#patterns[*]})) || die 'fatal: no pattern given.'

doit() {
    set +e
    git --no-pager grep "$@"
    if [[ $(git rev-parse --is-inside-work-tree 2>/dev/null) = true ]]; then
        git --no-pager submodule --quiet foreach --recursive 'git --no-pager grep --full-name '"$(printf '%q ' "$@")"'| sed "i\\
$path/" || :'
    fi
}

: ${GIT_PAGER:=$(git config core.pager)}
if [[ ${GIT_PAGER} = '' || ${GIT_PAGER} = cat ]]; then
    doit "${opts[@]}" "${patterns[@]}" "${revpaths[@]}"
else
    doit "${opts[@]}" "${patterns[@]}" "${revpaths[@]}" | LESS=${LESS:-FXR} ${GIT_PAGER}
fi