Create incremental file from input text (for Alfred Workflow)

fileFromSelection.sh

cd ~/Desktop

# incremental filename

# http://stackoverflow.com/a/806923/1628796
isnumeric() {
    re='^[0-9]+$'
    if ! [[ $1 =~ $re ]] ; then
       echo 0
    else
       echo 1
    fi
}
biggestNum=0
for f in ls text_*.txt; do
    filename="${f%.*}"
    filenum=${filename:5:10}
    if [[ $(isnumeric "$filenum") == 1 ]] ; then
        if [[ $biggestNum -lt $filenum ]] ; then
            biggestNum=$filenum
        fi
    fi
done

# create and open file
newFilename="text_$(($biggestNum + 1)).txt"
touch $newFilename
echo "{query}" >> "$newFilename"
open $newFilename