Convert ASCIDOC to DOCX

#!/bin/bash
INPUT_EXTENSION=adoc
OUTPUT_EXTENSION=docx

# for multiple extensions
# find . -type f -name "*.img" -o -name "*.bin" -o -name "*.txt"`;
for fullpath in $(find . -name "*.$INPUT_EXTENSION" -type f); do
    # Strip longest match of */ from start
    filename="${fullpath##*/}"
    # Substring from 0 thru pos of filename
    dir="${fullpath:0:${#fullpath}-${#filename}}"
    # Strip shortest match of . plus at least one non-dot char from end
    base="${filename%.[^.]*}"
    # Substring from len of base thru end
    ext="${filename:${#base}+1}"
    # If we have an extension and no base, it's really the base
    if [[ -z "$base" && -n "$ext" ]]; then
        base=".$ext"
        ext=""
    fi
    # echo -e "$fullpath:\n\tdir  = \"$dir\"\n\tbase = \"$base\"\n\text  = \"$ext\""
    INPUT_FILE_PATH=$dir$base
    asciidoctor --backend docbook --out-file - $INPUT_FILE_PATH.$INPUT_EXTENSION |
        pandoc --from docbook --to $OUTPUT_EXTENSION --output $INPUT_FILE_PATH.$OUTPUT_EXTENSION
    echo "Convert $INPUT_FILE_PATH.$ext to INPUT_FILE_PATH.$OUTPUT_EXTENSION sussfully"
done