Added initial port of original OSX project.

- This is a copy of the [OSX](https://github.com/bkuhlmann/osx) project
  originally released on 2012-03-31. The OSX project has been
  deprecated. All future development and support will take place with
  this project instead.
- This project uses the *macOS* name in order to better match the
  updated branding and terminology used by Apple.

lib/uninstallers.sh

@@ -0,0 +1,53 @@
+#! /bin/bash
+
+# DESCRIPTION
+# Defines uninstall functions.
+
+# Uninstalls selected application.
+uninstall_application() {
+  # Only use environment keys that end with "APP_NAME".
+  local keys=($(set | awk -F "=" '{print $1}' | grep ".*APP_NAME"))
+
+  printf "Select application to uninstall:\n"
+  for ((index = 0; index < ${#keys[*]}; index++)); do
+    local app_file="${!keys[$index]}"
+    printf "  $index: ${app_file}\n"
+  done
+  printf "  q: Quit/Exit\n\n"
+
+  read -p "Enter selection: " response
+  printf "\n"
+
+  local regex="^[0-9]+$"
+  if [[ $response =~ $regex ]]; then
+    local app_file="${!keys[$response]}"
+    local app_path=$(get_install_path "${app_file}")
+    sudo rm -rf "$app_path"
+    printf "Uninstalled: ${app_path}\n"
+  fi
+}
+export -f uninstall_application
+
+# Uninstalls selected extension.
+uninstall_extension() {
+  # Only use environment keys that end with "EXTENSION_PATH".
+  local keys=($(set | awk -F "=" '{print $1}' | grep ".*EXTENSION_PATH"))
+
+  printf "Select extension to uninstall:\n"
+  for ((index = 0; index < ${#keys[*]}; index++)); do
+    local extension_path="${!keys[$index]}"
+    printf "  $index: ${extension_path}\n"
+  done
+  printf "  q: Quit/Exit\n\n"
+
+  read -p "Enter selection: " response
+  printf "\n"
+
+  local regex="^[0-9]+$"
+  if [[ $response =~ $regex ]]; then
+    local extension_path="${!keys[$response]}"
+    rm -rf "${extension_path}"
+    printf "Uninstalled: ${extension_path}\n"
+  fi
+}
+export -f uninstall_extension