linkrr

#!/bin/bash

# Functions
echo_italic()
{
  echo -e "\e[3m$@\e[0m"
}

print_help()
{
  echo Usage:	linkrr COMMAND [POSITIONAL_ARGUMENTS]
  echo Commands:
  echo -e "  inspect\tInspect existing hardlinks between two folders."
  echo -e "  mirror\tMirrors hardlinks between two folders into two destination folders while correcting link targets."
  echo -e "  help\t\tPrints this help menu."

  echo Usages:
  echo -n "  inspect "; echo_italic "SOURCE_FILES_FOLDER SOURCE_LINKS_FOLDER"
  echo -n "  mirror "; echo_italic "SOURCE_FILES_FOLDER SOURCE_LINKS_FOLDER DESTINATION_FILES_FOLDER DESTINATION_LINKS_FOLDER"
  echo -e "  help"
}

args_error()
{
  echo -e "Missing or too many arguments. Check the usages by running 'linkrr help'."
  exit 0
}

help()
{
  # Show Help menu action
  if [ "$command" = "help" ] || [ $# -eq 0 ]; then
    print_help
    exit 0
  fi
}

mirror()
{
  # Show error message if incorrect number of parameters was entered
  if [ $# -ne 5 ]; then
    args_error
  fi

  # Parse positional parameters
  SRC_FILES_FOLDER=$2
  SRC_LINKS_FOLDER=$3
  DST_FILES_FOLDER=$4
  DST_LINKS_FOLDER=$5

  # Output the parameters for now.
  echo -e "$SRC_FILES_FOLDER"
  echo -e "$SRC_LINKS_FOLDER"
  echo -e "$DST_FILES_FOLDER"
  echo -e "$DST_LINKS_FOLDER"

  #TODO: Most of the logic for finding files to create will be in inspect(), implement that first.
  # Then just implement the same generic logic but apply it to create the new hardlinks.
  # We don't delete anything or overwrite anything, rather be safe than sorry approach.
}

inspect()
{
  if [ $# -ne 3 ]; then
    args_error
  fi

  # Parse positional parameters
  SRC_FILES_FOLDER=$2
  SRC_LINKS_FOLDER=$3
  DST_FILES_FOLDER=$3

  # Output the parameters for now.
  echo -e "$SRC_FILES_FOLDER"
  echo -e "$SRC_LINKS_FOLDER"
  echo -e "$DST_FILES_FOLDER"

  #TODO: Find the "samefile" between destination and source that will be affected,
  # by listing all files in source folder and looking for an equivalent in the dst
  # Use to store finding results:
  # RESULT=$(find DST_FOLDER -xdev -samefile SRC_FILE)
  # Check found/matching with:
  # [ -z "${RESULT}" ]; then SOMETHING; fi
  # Then output all the files matching / found. This tells us what the new hardlinks would be.
  # We should also find the HARDLINK<=>SRC_FILE link so we can reuse the same name and location (relative to the SRC_LINKS_FOLDER) to mirror.
  # This should output a "what we're going to do / create" kind of view.
}

main()
{
  # Args Validation
  command=$1

  case "$command" in
    mirror) mirror $@;;
    inspect) inspect $@;;
    help) help;;
  esac
}

# Program Execution
cat << EOF
*********************
|      Linkrr       |
*********************
EOF

main $@