#!/bin/bash

get_help=false
recursive=false

function get_args(){
# get arguments
for var in "$@"
do
case $var in
-h|-help) get_help=true;;
-r|-recursive) recursive=true;;
*) search_dir=$var
esac
done
}

function print_help_text(){
# print help text and exit
echo "format filenames in a directory, perhaps recursively"
echo "usage: format_directory [options] PATH"
echo "	-h | -help		print this help text and exit"
echo "	-r | -recursive		format files recursively"
exit
}

# if user hasn't passed any arguments, print help text and exit
if [ $# -eq 0 ]; then
echo "error--you haven't passed any arguments"
print_help_text
exit 1
fi

get_args "$@"

# if passed help flag, print help text and exit
if $get_help
then
print_help_text
fi

# write find command
find_command="find "$search_dir
if $recursive
then
echo "formatting files recursively"$'\n'
else
echo "only formatting paths in directory you've specified"$'\n'
find_command="$find_command"" -maxdepth 1"
fi
echo "find command:"$'\n'"${find_command}"$'\n'$'\n'"formatted paths:"$'\n'

# run find command and loop through results
$find_command | while read line; do

# get directory and filename
directory=$(dirname "${line}");
filename=$(basename "${line}");

# skip hidden files with folder info
if [ "$filename" != '.DS_Store' ] &&  [ "$filename" != 'desktop.ini' ]
then

# make filename lowercase
filename=$(echo "$filename" | tr '[A-Z]' '[a-z]')

# for files, replace spaces and dashes with underscores
if [ -f "${line}" ]
then
filename=$(echo "${filename}" | tr ' ' _)
filename=$(echo "${filename}" | tr - _)

# for directories, replace spaces and underscores with dashes
elif [ -d "${line}" ]
then
filename=$(echo "${filename}" | tr ' ' -)
filename=$(echo "${filename}" | tr _ -)

fi

# get new name, print old and new paths, move file
new_path="$directory"/"$filename"
echo "old path: ""${line}"
echo "new path: ""${new_path}"

move_command='mv ''"'"$line"'" "'"$new_path"'"'
echo $move_command
"$move_command"
echo ""

fi
done