From 5cc8349f1d24ce7b81a619511819ec631c921642 Mon Sep 17 00:00:00 2001
From: Luca Schlecker <luca.schlecker@hotmail.com>
Date: Sun, 29 Aug 2021 16:20:45 +0200
Subject: [PATCH] add find_package support.

---
 CMakeLists.txt            | 25 ++++++++++++++++++++++++-
 cmake/CrowConfig.cmake.in | 24 ++++++++++++++++++++++++
 2 files changed, 48 insertions(+), 1 deletion(-)
 create mode 100644 cmake/CrowConfig.cmake.in

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2759db0da..f667c5124 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,7 +31,12 @@ option(CROW_INSTALL        "Add install step for Crow"         ON )
 #####################################
 add_library(Crow INTERFACE)
 add_library(Crow::Crow ALIAS Crow)
-target_include_directories(Crow INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/include)
+
+target_include_directories(Crow
+	INTERFACE
+		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+		$<INSTALL_INTERFACE:include>
+)
 
 find_package(Boost 1.64 COMPONENTS system date_time REQUIRED)
 find_package(Threads REQUIRED)
@@ -81,7 +86,25 @@ endif()
 # Install Files
 #####################################
 if(CROW_INSTALL)
+	install(TARGETS Crow EXPORT CrowTargets)
 	install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/ DESTINATION include)
+
+	install(EXPORT CrowTargets
+		FILE CrowTargets.cmake
+		NAMESPACE Crow::
+		DESTINATION lib/cmake/Crow
+	)
+
+	include(CMakePackageConfigHelpers)
+	configure_package_config_file(
+		"${CMAKE_CURRENT_SOURCE_DIR}/cmake/CrowConfig.cmake.in"
+		"${CMAKE_CURRENT_BINARY_DIR}/CrowConfig.cmake"
+		INSTALL_DESTINATION lib/cmake/Crow
+	)
+	install(FILES
+    "${CMAKE_CURRENT_BINARY_DIR}/CrowConfig.cmake"
+    DESTINATION lib/cmake/Crow
+  )
 endif()
 
 set(CPACK_GENERATOR "DEB")
diff --git a/cmake/CrowConfig.cmake.in b/cmake/CrowConfig.cmake.in
new file mode 100644
index 000000000..4b4485dd7
--- /dev/null
+++ b/cmake/CrowConfig.cmake.in
@@ -0,0 +1,24 @@
+@PACKAGE_INIT@
+
+include(CMakeFindDependencyMacro)
+find_dependency(Boost 1.64 COMPONENTS system date_time)
+find_dependency(Threads)
+find_dependency(ZLIB)
+find_dependency(OpenSSL)
+
+include("${CMAKE_CURRENT_LIST_DIR}/CrowTargets.cmake")
+check_required_components("@PROJECT_NAME@")
+
+set(CROW_DEPLIBS Boost::boost Boost::system Boost::date_time Threads::Threads)
+
+if(OPENSSL_FOUND)
+  list(APPEND CROW_DEPLIBS OpenSSL::SSL)
+endif()
+
+if(ZLIB_FOUND)
+  list(APPEND CROW_DEPLIBS ZLIB::ZLIB)
+endif()
+
+set_target_properties(Crow::Crow PROPERTIES
+  INTERFACE_LINK_LIBRARIES "${CROW_DEPLIBS}"
+)