Frontend for find+grep commands

NB: works with dates is highly depends on locale. In my case i get it in form DD.MM.YYYY and translate to form YYYY-MM-DD (variable $dt in runfind function)

#! /bin/bash
#
# Frontend for find(1)
# Author: Victor Ananjevsky <ananasik@gmail.com>, 2015-2017
#

export find_cmd='@bash -c "run_find %1 %2 %3 %4 %5"'

export fpipe=$(mktemp -u --tmpdir find.XXXXXXXX)
mkfifo "$fpipe"

trap "rm -f $fpipe" EXIT

fkey=$(($RANDOM * $$))

function run_find
{
    echo "6:@disable@"
    if [[ $2 != TRUE ]]; then
        ARGS="-name '$1'"
    else
        ARGS="-regex '$1'"
    fi
    if [[ -n "$4" ]]; then
        dt=$(echo "$4" | awk -F. '{printf "%s-%s-%s", $3, $2, $1}')
        d1=$(date +%j -d $dt)
        d2=$(date +%j)
        d=$(($d1 - $d2))
        ARGS+=" -ctime $d"
    fi
    if [[ -n "$5" ]]; then
        ARGS+=" -exec grep -q -E '$5' {} \;"
    fi
    ARGS+=" -printf '%p\n%s\n%M\n%TD %TH:%TM\n%u/%g\n'"
    echo -e '\f' >> "$fpipe"
    eval find "$3" $ARGS >> "$fpipe"
    echo "6:$find_cmd"
}
export -f run_find

function open_file
{
    xdg-open "$1" &> /dev/null
}
export -f open_file

exec 3<> $fpipe

yad --plug="$fkey" --tabnum=1 --form --field="Name" '*' --field="Use regex:chk" '' \
    --field="Directory:dir" '' --field="Newer than:dt" '' \
    --field="Content" '' --field="gtk-find:fbtn" "$find_cmd" &

yad --plug="$fkey" --tabnum=2 --list --no-markup --dclick-action="bash -c 'open_file %s'" \
    --text "Search results:" --column="Name" --column="Size:sz" --column="Perms" \
    --column="Date" --column="Owner" --search-column=1 --expand-column=1 <&3 &

yad --paned --key="$fkey" --button="gtk-close:1" --width=700 --height=500 \
    --title="Find files" --window-icon="find"

exec 3>&-

[bpo]

Date translation $dt

With bash, does not need awk, delimiter independent:

dt=${4:6:4}-${4:3:2}-${4:0:2}

Or switch yad to use ISO 8601 date format ..

--date-format=%F

.. and no translation is necessary:

dt=$4

Should be independent from locale?