shit

#!/bin/bash
#------------------------------------------------------------------------------
# [Dylan Foster] Swap or Not
#                The purpose of this assignment is to compare the names of two
#                files and swap the files if they are not identical.
#------------------------------------------------------------------------------

file1=$1
file2=$2

function debug {
    echo "*******************************"
    echo "*  $file1" "is currently this  *"
    echo "*  $file2" "is currently this  *"
    echo "*******************************"
}

# Function to show the usage message
function show_usage {
    echo "USAGE: > bash swap.sh  file1 file2"
}


# Function to show inability to swap
function show_error {
    echo "Cannot perform swap, please check files"
    echo "------------------------------------------------------------"
    exit 1
}

# Function to swap files
function swap {
    if [ "$file1" != "$file2" ]; then
        #debug
        local TMPFILE=tmp.$$
        mv "$file1" $TMPFILE
        mv "$file2" "$file1"
        mv $TMPFILE "$file2"
        echo "$file1" "swapped with" "$file2" >> log.txt
        echo "$file1" "swapped with" "$file2"
        echo "------------------------------------------------------------"
        exit 0
    else
        show_usage
        show_error
        exit 1
    fi
}

# If no arguments are passed, prompt the user for arguments
if [ $# -eq 0 ]; then
    #debug
    echo -n "Enter two files you want to swap > "
    read file1 file2
    debug
fi

# If only the first file is supplied
if [ $# -eq 1 ]; then
    echo "The second filename was not supplied"
    show_usage
    show_error
fi

# If more than two files are input
if [ $# -gt 2 ]; then
    echo "More than two files are supplied"
    show_usage
    show_error
fi


# Checks to see if the files exist
if [[ ! -e "$1" ]]; then
    echo "$1" "does not exist"
    #debug
    show_error
elif [[ ! -e "$2" ]]; then
    echo "$2" "does not exist"
    #debug
    show_error
fi

# Check if files are both readable
if [[ ! -r "$file1" ]]; then
    echo "$file1" "is not readable"
    show_error
elif [[ ! -r "$file2" ]]; then
    echo "$file2" "is not readable"
    show_error
fi

# Check if files are both writable
if [[ ! -w "$file1" ]]; then
    echo "$file1" "is not writable"
    show_error
elif [[ ! -w "$file2" ]]; then
    echo "$file2" "is not writable"
    show_error
fi

# Check if files are both executable
if [[ ! -x "$file1" ]]; then
    echo "$file1" "is not executable"
    show_error
elif [[ ! -x "$file2" ]]; then
    echo "$file2" "is not executable"
    show_error
fi


#------------------------------------------------------------------------------
# Executes swap method if all checks are clear

swap

#------------------------------------------------------------------------------