ao-mud/spells/read-magic

#!/bin/sh

# This spell reads the enchanted attributes from the specified file.
# If a field name is provided as the second argument, it reads the attribute with that name.
# If the file or attribute does not exist, it raises an error.

# Check that the correct number of arguments was provided
if [ $# -lt 1 ] || [ $# -gt 2 ]; then
  echo "Error: This spell requires one or two arguments: a file path and an optional attribute name."
  exit 1
fi

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

# 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 read the attribute value using the available commands
read_attribute_value() {
  # Try to read the attribute using the 'attr' command
  real_path=$(readlink -f "$file")
  attribute_value=$(attr -g "$attribute" "$real_path" 2> /dev/null | cut -d ":" -f 2 | xargs)

  # If the 'attr' command is not available, try using the 'xattr' command
  if [ -z "$attribute_value" ]; then
    attribute_value=$(xattr -p "$attribute" "$real_path" 2> /dev/null | cut -d ":" -f 2 | xargs)
  fi

  # If the 'xattr' command is not available, try using the 'getfattr' command
  if [ -z "$attribute_value" ]; then
    attribute_value=$(getfattr -h -n "$attribute" --only-values "$file" 2> /dev/null)
  fi

  # Return the attribute value
  echo "$attribute_value"
}

# If an attribute name was not provided, print all attributes in YAML format
if [ -z "$attribute" ]; then
  attributes_found=0

  # Define a function to process each attribute
  process_attribute() {
    # Read the attribute value using the read_attribute_value function
    value=$(read_attribute_value "$attribute" "$file")

    # Check if the attribute value was set
    if [ -n "$value" ]; then
      # Print the attribute and value in YAML format
      printf "%s: %s\n" "$1" "$value"
      attributes_found=$((attributes_found + 1))
    fi
  }

  # Call the process_attribute function for each attribute
  for attribute in $(getfattr -h -m ".*" -e hex "$file" | cut -d ":" -f 1 | cut -d "." -f 2 | tr -d ' '); do
    process_attribute "$attribute"
  done

  # Check if no extended attributes were found
  if [ "$attributes_found" -eq 0 ]; then
    echo "No enchanted attributes found."
  fi

# If an attribute name was provided, print the attribute value
else
  # Read the attribute value using the read_attribute_value function
  value=$(read_attribute_value "$attribute" "$file")

  # Check if the attribute value was set
  if [ -z "$value" ]; then
    echo "Error: The attribute does not exist."
    exit 1
  fi

  # Print the attribute value
  echo "$value"
fi