fix(user/zeropad.sh):Only zero-pad files with leading digits

[BK-2020-03.git] / user / zeropad.sh

#!/bin/bash
# Desc: Zero-pad working dir files with initial digits for sorting
# Usage: zeropad.sh
# Version: 0.0.3

# Find the maximum number of leading digits in the filenames of working dir
max_digits="$(ls -1 * | sed 's/[^0-9].*//' | awk '{ if(length > L) L=length } END { print L }')";
declare -p max_digits;

# Loop over the files and rename them
while read -r file; do
    re='^[0-9]+';
    if [[ ! "$file" =~ $re ]]; then continue; fi;

    # Extract the leading digits
    digits="$(echo "$file" | sed 's/\([0-9]*\).*/\1/')";
    # Zero-pad the digits
    padded_digits="$(printf "%0${max_digits}d" "$digits")";
    # Construct the new filename
    new_file="${padded_digits}${file#${digits}}";
    # Rename the file
    mv -n "$file" "$new_file"
    # declare -p file new_file; # debug
done < <(find . -mindepth 1 -maxdepth 1 -type f);

# Author: Steven Baltakatei Sandoval
# License: GPLv3+