#!/bin/bash
#  $HeadURL: https://svn.pasta.freemyip.com/main/ade/tags/3.0.3/share/templates/loc/bin/loc $ $LastChangedRevision: 11136 $

#  Modules
. $(miniade) || { echo "${0##*/}: ERROR: miniade failed (hint: run 'miniade' to see error)" >&2; exit 1; }

#  Configurable stuff

#  Other globals

#  The next line is extracted by 'adegmt -l'. After adegmt has been used to get this template the line can be removed.
#  ADEGMT-LIST-HINT: MINIADE-based bash script implementing lx(1)

main()
{
    local MY_ARGS UPDATE_CACHE_FLAG PROGNAME FILTER_IN_REGEXP FILTER_OUT_REGEXP ARG

    #  Defaults for options
    UPDATE_CACHE_FLAG=false
    OPT_FILTER_OUT_REGEXP=
    MAX_DB_AGE=$((3600 * 24 * 7))

    #  Process options
    special_opts_handler()
    {
        case $1 in
            --update)    UPDATE_CACHE_FLAG=true ;;
            --no-filter) OPT_FILTER_OUT_REGEXP="THIS_WONT_MATCH_ANYTHING" ;;
            *)           return 1 ;;
        esac
    }
    miniade_process_options --help-handler=help --special-opts-handler=special_opts_handler MY_ARGS "$@" && set -- "${MY_ARGS[@]}"

    #  Process arguments
    [ $# -ge 1 ] || miniade_bad_usage
    FILTER_IN_REGEXP=""
    for ARG in "$@"; do
        FILTER_IN_REGEXP+="(?=.*$ARG)"
    done

    #  Sanity checks and derivations
    miniade_get_progname PROGNAME
    #  There's no nice way to determine the .config dir. Stephen Kitt on
    #  https://unix.stackexchange.com/questions/726717 suggests to use 
    #  ${XDG_CONFIG_HOME:-$HOME/.config}.
    CONFIG_DIR=${XDG_CONFIG_HOME:-$HOME/.config}/$PROGNAME
    CONFIG_DIR=$(echo "$CONFIG_DIR" | sed "s@^~/@$HOME/@")
    CONFIG_FILE=$CONFIG_DIR/settings
    CACHE_DIR=${XDG_CACHE_HOME:-$HOME/.cache}/$PROGNAME
    CACHE_DIR=$(echo "$CACHE_DIR" | sed "s@^~/@$HOME/@")
    CACHE_FILE=$CACHE_DIR/find.out
    if [ ! -f $CONFIG_FILE ]; then
        miniade_warning "$CONFIG_FILE: not found; generating from template ..."
        mkdir -p $CONFIG_DIR
        {
            echo "#FILTER_OUT_REGEXP=\"/(not_this_dir|or_this_dir|or_this_other_dir)/\""
            echo "#MAX_DB_AGE=$((3600 * 24 * 7))     #  one week"
        } > $CONFIG_FILE
    fi
    [ "X$(bash -c ". $CONFIG_FILE 2>/dev/null && echo OK")" = XOK ] || miniade_error "$CONFIG_FILE: not loadable"
    . $CONFIG_FILE
    if $UPDATE_CACHE_FLAG; then
        :
    elif [ ! -f $CACHE_FILE ]; then
        miniade_warning "cache missing"
        UPDATE_CACHE_FLAG=true
    elif (( $(date +%s)-$(stat -c %Y $CACHE_FILE) > $MAX_DB_AGE )); then
        miniade_warning "cache old"
        UPDATE_CACHE_FLAG=true
    fi
    umask 077
    if [ "X$OPT_FILTER_OUT_REGEXP" != X ]; then
        FILTER_OUT_REGEXP="$OPT_FILTER_OUT_REGEXP"
    elif [ "X$FILTER_OUT_REGEXP" = X ]; then
        FILTER_OUT_REGEXP=THIS_WONT_MATCH_ANYTHING
    fi

    #  Guts
    mkdir -p $CACHE_DIR 
    if $UPDATE_CACHE_FLAG; then
        miniade_info "updating cache ..."
        miniade_evaler "find ~/ -type f -print | sed \"s@^\$HOME/@@\" | sort > /tmp/$PROGNAME.$$.find"
        miniade_evaler "mv /tmp/$PROGNAME.$$.find $CACHE_FILE"
    fi

    miniade_evaler "grep -P \"$FILTER_IN_REGEXP\" $CACHE_FILE | egrep -v \"$FILTER_OUT_REGEXP\""
}

help()
{
    local PROGNAME

    miniade_get_progname PROGNAME
    echo "Usage: $PROGNAME [ <standard-options> ] [ --update ] [ --no-filter ] <pattern> [ ... ]"
    exit 0
}

main "$@"