search text with multiple patterns and highlights

search.sh

function m () { 
    function _usage () 
    { 
        echo "usage: COMMAND [-inHRp] -p<pattern1> -p<pattern2> <filename>";
        echo "-i : ignore case";
        echo "-n : show line number";
        echo "-H : show filename";
        echo "-h : show header";
        echo "-p : specify pattern";
        echo "-R : search recursively"
    };
    declare -a patterns;
    local ignorecase_flag recursive_flag filename linum header_flag colon result OPTIND;
    while getopts "iHhnRp:" opt; do
        case $opt in 
            i)
                ignorecase_flag=true
            ;;
            H)
                filename="FILENAME,"
            ;;
            n)
                linum="NR,"
            ;;
            p)
                patterns+=("$OPTARG")
            ;;
            h)
                header_flag=true
            ;;
            R)
                recursive_flag=true
            ;;
            \?)
                _usage;
                return
            ;;
        esac;
    done;
    if [[ -n $filename || -n $linum ]]; then
        colon="\":\",";
    fi;
    shift $(( $OPTIND - 1 ));
    if [[ $ignorecase_flag == true ]]; then
        for s in "${patterns[@]}";
        do
            result+=" && s~/${s,,}/";
        done;
        result=${result# && };
        result="{s=tolower(\$0)} $result";
    else
        for s in "${patterns[@]}";
        do
            result="$result && /$s/";
        done;
        result=${result# && };
    fi;
    result+=" { print "$filename$linum$colon"\$0 }";
    if [[ ! -t 0 ]]; then
        cat - | awk "${result}";
    else
        for f in "$@";
        do
            if [[ -d $f ]]; then
                if [[ $recursive_flag == true ]]; then
                    find -L $f -not -path '*/\.*' -type f -print0 2> /dev/null | while IFS= read -r -d '' ff; do
                        if file "$ff" | grep --color=auto --line-buffered -q "text"; then
                            [[ $header_flag == true ]] && echo "########## processing $ff ##########";
                            awk "${result}" "$ff";
                        fi;
                    done;
                fi;
            else
                if file "$f" | grep --color=auto --line-buffered -q "text"; then
                    [[ $header_flag == true ]] && echo "########## processing $f ##########";
                    awk "${result}" "$f";
                fi;
            fi;
        done;
    fi
}

function h () { 
    function _usage () 
    { 
        echo "usage: YOUR_COMMAND | h [-idn] args...
	-i : ignore case
	-d : disable regexp
	-n : invert colors"
    };
    local _OPTS OPTIND;
    if test -t 0; then
        _usage;
        return;
    fi;
    while getopts ":idnQ" opt; do
        case $opt in 
            i)
                _OPTS+=" -i "
            ;;
            d)
                _OPTS+=" -Q "
            ;;
            n)
                n_flag=true
            ;;
            Q)
                _OPTS+=" -Q "
            ;;
            \?)
                _usage;
                return
            ;;
        esac;
    done;
    shift $(($OPTIND - 1));
    if (( ${#@} > 12)); then
        echo "Too many terms. h supports a maximum of 12 groups. Consider relying on regular expression supported patterns like \"word1\\|word2\"";
        exit -1;
    fi;
    [[ -n $ZSH_VERSION ]] && setopt localoptions && setopt ksharrays && setopt ignorebraces;
    local _i=0;
    if [ -z $n_flag ]; then
        _COLORS=("underline bold red" "underline bold green" "underline bold yellow" "underline bold blue" "underline bold magenta" "underline bold cyan" "bold on_red" "bold on_green" "bold black on_yellow" "bold on_blue" "bold on_cyan" "bold on_magenta");
    else
        _COLORS=("bold on_red" "bold on_green" "bold black on_yellow" "bold on_blue" "bold on_magenta" "bold on_cyan" "bold black on_white" "underline bold red" "underline bold green" "underline bold yellow" "underline bold blue" "underline bold magenta");
    fi;
    for keyword in "$@";
    do
        local _COMMAND=$_COMMAND"ack $_OPTS --noenv --flush --passthru --color --color-match=\"${_COLORS[$_i]}\" '$keyword' |";
        _i=$_i+1;
    done;
    _COMMAND=${_COMMAND%?};
    cat - | eval $_COMMAND
}