feat: add the package target

Author: JPHutchins

CMakeLists.txt

@@ -2,3 +2,33 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 # Authors: J.P. Hutchins <jp@intercreate.io>
+
+cmake_minimum_required(VERSION 3.20)
+project(ic_cmake)
+
+if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+    # We're in the root, define additional targets for developers.
+
+    # generate a package for distribution
+    # reference: https://www.foonathan.net/2022/06/cmake-fetchcontent/
+    set(package_files 
+        ic.cmake
+        LICENSE
+        dependencies/fetch_test_cmake.cmake
+        src/ic_bundle.cmake
+        src/ic_project.cmake
+        src/ic_utils.cmake
+    )
+    add_custom_command(
+        OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.zip
+        COMMAND ${CMAKE_COMMAND} -E tar
+            c ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.zip
+            --format=zip
+            -- ${package_files}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+        DEPENDS ${package_files}
+    )
+    add_custom_target(package
+        DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.zip
+    )
+endif()