#!/bin/sh

# This spell enchants the specified file with the given attribute and value.
# If the attribute already exists, it is overwritten.
# If the file or attribute does not exist, it raises an error.

# Check that the correct number of arguments was provided
if [ $# -lt 3 ] | [ $# -gt 4 ]; then
  echo "Error: This spell requires three or four arguments: a file path, an attribute name, and a value."
  exit 1
fi

# Set the file path, attribute name, and attribute value variables
file=$1
attribute=$2
value=$3

# Check that the file exists
if [ ! -f "$file" ] && [ ! -d "$file" ]; then
  echo "Error: The file does not exist."
  exit 1
fi

# Define a function to set the attribute value using the available commands
set_attribute_value() {
  # Try to set the attribute using the 'attr' command
  attr -s "$1" -V "$2" "$3" 2>&1 >/dev/null ||

  # If the 'attr' command is not available, try using the 'xattr' command
  xattr -w "$1" "$2" "$3" 2>&1 > /dev/null ||

  # If the 'xattr' command is not available, try using the 'setfattr' command
  setfattr -n "$1" -v "$2" "$3" 2>&1 > /dev/null ||

  # If none of the commands are available, raise an error
  (
    echo "Error: This spell requires the 'attr', 'xattr', or 'setfattr' command to be installed."
    exit 1
  )
}

# Set the attribute value using the set_attribute_value function
value=$(printf "%q\n" "$value")
set_attribute_value "$attribute" "$value" "$file"

echo "The file has been enchanted with the attribute '$attribute' and value '$value'."