lowercase-helper

#!/bin/sh
set -eu

usage() {
    echo "$0 The BF2 linux server requires all files to be in lowercase, except python files. See <bf2_installation_path>/readmes/readme-linux.txt"
    echo "   This script lowercases a given directory and all descendent folders"
    echo "Examples:"
    echo "  $0 --dir /server/bf2/mods/bf2/ESAI"
}

# Get some options
while test $# -gt 0; do
    case "$1" in
        -h|--help)
            usage
            exit 0
            ;;
        -d|--dir)
            shift
            if test $# -gt 0; then
                DIR="$1"
                shift
            fi
            ;;
        *)
            echo "Invalid option '$1'" 1>&2
            usage
            exit 1
            ;;
    esac
done

if [ -z "$DIR" ]; then
    echo "Specify a directory as the first argument"
    usage()
    exit 1
fi

# Lowercase this directory
if basename "$DIR" | grep -E '[A-Z]' > /dev/null; then
    DIR_LOWERCASED="$( dirname "$DIR" )/$( basename "$DIR" | tr '[:upper:]' '[:lower:]' )"
    mv -v "$DIR" "$DIR_LOWERCASED" 2>&1 || true
    DIR="$DIR_LOWERCASED"
fi

# Lowercase descendent directories starting from the parent-most
i=1
while true; do
    DIRS=$( find "$DIR" -mindepth "$i" -maxdepth "$i" -type d | grep -E '[A-Z]' || true )
    if [ -z "$DIRS" ]; then
        break
    fi
    echo "$DIRS" | while read -r d; do
        mv -v "$d" "$( echo "$d" | tr '[:upper:]' '[:lower:]' )"
    done
    i=$(( $i + 1 ))
done

# Lowercase descendent files starting from the parent-most
i=1
while true; do
    FILES=$( find "$DIR" -mindepth "$i" -maxdepth "$i" -type f | grep -E '[A-Z]' || true )
    if [ -z "$FILES" ]; then
        break
    fi
    echo "$FILES" | while read -r f; do
        mv -v "$f" "$( echo "$f" | tr '[:upper:]' '[:lower:]' )"
    done
    i=$(( $i + 1 ))
done