Simple bash installing addon script

installer.sh

#!/bin/bash

# Function to echo colored text
color_echo() {
  local color=$1
  local message=$2

  case "$color" in
    "red")
      echo -e "\033[0;31m$message\033[0m"
      ;;
    "green")
      echo -e "\033[0;32m$message\033[0m"
      ;;
    "yellow")
      echo -e "\033[0;33m$message\033[0m"
      ;;
    "blue")
      echo -e "\033[0;34m$message\033[0m"
      ;;
    "purple")
      echo -e "\033[0;35m$message\033[0m"
      ;;
    "cyan")
      echo -e "\033[0;36m$message\033[0m"
      ;;
    "white")
      echo -e "\033[0;37m$message\033[0m"
      ;;
    *)
      echo "Unsupported color: $color"
      ;;
  esac
}

# Function to download a file
download_file() {
  local url=$1
  local destination=$2

  color_echo "cyan" "Downloading $url to $destination"
  if command -v curl &>/dev/null; then
    curl -s -o "$destination" "$url" && color_echo "green" "Download successful" || { color_echo "red" "Download failed"; exit 1; }
  elif command -v wget &>/dev/null; then
    wget -q -O "$destination" "$url" && color_echo "green" "Download successful" || { color_echo "red" "Download failed"; exit 1; }
  else
    color_echo "red" "Error: Neither curl nor wget found for downloading."
    exit 1
  fi
}

# Function to unzip a file
unzip_file() {
  local file=$1
  local destination=$2

  color_echo "cyan" "Unzipping $file to $destination"
  if command -v unzip &>/dev/null; then
    unzip -q "$file" -d "$destination" && color_echo "green" "Unzip successful" || { color_echo "red" "Unzip failed"; exit 1; }
  else
    color_echo "red" "Error: unzip command not found."
    exit 1
  fi
}

# Function to untar a file
untar_file() {
  local file=$1
  local destination=$2

  color_echo "cyan" "Untarring $file to $destination"
  tar -xzf "$file" -C "$destination" && color_echo "green" "Untar successful" || { color_echo "red" "Untar failed"; exit 1; }
}

# Function to copy a file
copy_file() {
  local source=$1
  local destination=$2

  color_echo "cyan" "Copying $source to $destination"
  cp "$source" "$destination" && color_echo "green" "Copy successful" || { color_echo "red" "Copy failed"; exit 1; }
}

# Function to remove a file
remove_file() {
  local file=$1

  color_echo "cyan" "Removing $file"
  rm "$file" && color_echo "green" "Remove successful" || { color_echo "red" "Remove failed"; exit 1; }
}

# Function to remove a directory
remove_directory() {
  local directory=$1

  color_echo "cyan" "Removing directory $directory"
  rm -rf "$directory" && color_echo "green" "Remove directory successful" || { color_echo "red" "Remove directory failed"; exit 1; }
}

# Function for force removal (ignores non-existent files)
force_remove() {
  local target=$1

  color_echo "cyan" "Force removing $target"
  rm -rf "$target" && color_echo "green" "Force remove successful" || { color_echo "red" "Force remove failed"; exit 1; }
}

# Function to move/rename a file or directory
move() {
  local source=$1
  local destination=$2

  color_echo "cyan" "Moving $source to $destination"
  mv "$source" "$destination" && color_echo "green" "Move successful" || { color_echo "red" "Move failed"; exit 1; }
}

# Function to create a directory
make_directory() {
  local directory=$1

  color_echo "cyan" "Creating directory $directory"
  mkdir -p "$directory" && color_echo "green" "Create directory successful" || { color_echo "red" "Create directory failed"; exit 1; }
}

# Function to check if a file exists
file_exists() {
  local file=$1

  color_echo "cyan" "Checking if $file exists"
  [ -e "$file" ]
}

# Function to check if a directory exists
directory_exists() {
  local directory=$1

  color_echo "cyan" "Checking if directory $directory exists"
  [ -d "$directory" ]
}

function ask() {
  local message=$1
  
  local default=${FALSE}

  read -p "${message} [Yes/no]: " yn
  result=''
  if [ "${yn}" == "" ]; then
        result="true"
  fi
  if [ "${yn}" == "Yes" ]; then
        result="true"
  fi
  if [ "${yn}" == "No" ]; then
        result="false"
  fi;
    
  [ "${result}" ==  "true" ]

  # Ctrl-D pressed.
  return ${default}
}

function read_variable() {
  local message=$1
  
  local default=${FALSE}

  read -p "${message}: " yn
  echo "${yn}"
}

function read_secure_variable() {
  local message=$1
  
  local default=${FALSE}

  read -p "${message}: " -s yn
  echo "${yn}"
}




# Example usage:
if ask "Are you sure?"; then
  password=$(read_variable "Enter variable")
  echo "$password"
  download_file "https://src.fedoraproject.org/lookaside/extras/nss_db/db-4.7.25.NC.tar.gz/073ab7f20d24b3872a51ca762f5090e7/db-4.7.25.NC.tar.gz" "./somefile.tar.gz"
    #unzip_file "./somefile.zip" "."
    untar_file "./somefile.tar.gz" "."
    remove_file "./somefile.tar.gz"
    remove_directory db-4.7.25.N*
    copy_file "./source.txt" "./destination.txt"
    remove_file "./unwanted_file.txt"
    remove_directory "./unwanted_directory"
    force_remove "./nonexistent_file_or_directory"
    move "./old_name.txt" "./new_name.txt"
    make_directory "./new_directory"
    if file_exists "./existing_file.txt"; then
    color_echo "green" "File exists!"
    else
    color_echo "red" "File does not exist."
    fi
    if directory_exists "./existing_directory"; then
    color_echo "green" "Directory exists!"
    else
    color_echo "red" "Directory does not exist."
    fi
fi