Merge pull request #5 from plorth/fetch-content

Switch to CMake's FetchContent

CMakeLists.txt

@@ -8,8 +8,27 @@ PROJECT(
   LANGUAGES CXX
 )
 
+INCLUDE(FetchContent)
 INCLUDE(GNUInstallDirs)
 
+FETCHCONTENT_DECLARE(
+  PeeloResult
+  GIT_REPOSITORY
+    https://github.com/peelonet/peelo-result.git
+  GIT_TAG
+    v0.6.0
+)
+FETCHCONTENT_DECLARE(
+  PeeloUnicode
+  GIT_REPOSITORY
+    https://github.com/peelonet/peelo-unicode.git
+  GIT_TAG
+    v2.0.0
+)
+
+FETCHCONTENT_MAKEAVAILABLE(PeeloResult)
+FETCHCONTENT_MAKEAVAILABLE(PeeloUnicode)
+
 ADD_LIBRARY(${PROJECT_NAME} INTERFACE)
 
 TARGET_INCLUDE_DIRECTORIES(
@@ -19,6 +38,13 @@ TARGET_INCLUDE_DIRECTORIES(
     $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 
+TARGET_LINK_LIBRARIES(
+  ${PROJECT_NAME}
+  INTERFACE
+    PeeloResult
+    PeeloUnicode
+)
+
 TARGET_COMPILE_FEATURES(
   ${PROJECT_NAME}
   INTERFACE
@@ -71,5 +97,7 @@ INSTALL(
     include
 )
 
-ENABLE_TESTING()
-ADD_SUBDIRECTORY(test)
+IF(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
+  ENABLE_TESTING()
+  ADD_SUBDIRECTORY(test)
+ENDIF()