Remove git submodules in favor of cmake's ExternalProject

.gitignore

@@ -91,3 +91,6 @@ compile_commands.json
 *.rpm
 *.deb
 package.dir
+
+# Dependencies
+.third-party

CMakeLists.txt

@@ -45,13 +45,6 @@ else()
     find_package_handle_standard_args(LMDB DEFAULT_MSG LMDB_INCLUDE_DIR LMDB_LIBRARY)
 endif()
 
-if (NOT EXISTS "${CMAKE_SOURCE_DIR}/libs/lmdbxx/.git" OR
-    NOT EXISTS "${CMAKE_SOURCE_DIR}/libs/matrix-structs/.git")
-    message(WARNING "The git submodules are not available.")
-    message(STATUS "Running git submodule update --init --recursive ...")
-    execute_process(COMMAND git submodule update --init --recursive)
-endif()
-
 #
 # Discover Qt dependencies.
 #
@@ -219,10 +212,21 @@ set(SRC_FILES
     src/main.cc
 )
 
+#
+# matrix-structs
+#
+include(${CMAKE_SOURCE_DIR}/cmake/MatrixStructs.cmake)
+include_directories(${MATRIX_STRUCTS_INCLUDE_DIRS})
+
+#
+# lmdbxx
+#
+include(${CMAKE_SOURCE_DIR}/cmake/LMDBXX.cmake)
+include_directories(${LMDBXX_INCLUDE_DIRS})
+
 include_directories(include)
 include_directories(include/ui)
 
-include_directories(libs/lmdbxx)
 include_directories(${LMDB_INCLUDE_DIR})
 
 qt5_wrap_cpp(MOC_HEADERS
@@ -317,10 +321,6 @@ endif()
 qt5_add_resources(LANG_QRC ${_qrc})
 qt5_add_resources(QRC resources/res.qrc)
 
-add_subdirectory(libs/matrix-structs)
-include_directories(${matrix_structs_SOURCE_DIR}/include)
-include_directories(${matrix_structs_SOURCE_DIR}/deps)
-
 set(COMMON_LIBS matrix_structs Qt5::Widgets Qt5::Network Qt5::Concurrent)
 
 if(APPVEYOR_BUILD)
@@ -342,6 +342,8 @@ else()
     target_link_libraries (nheko ${NHEKO_LIBS} Qt5::Multimedia)
 endif()
 
+add_dependencies(nheko MatrixStructs lmdbxx)
+
 if(UNIX AND NOT APPLE)
     install (TARGETS nheko RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
     install (FILES "resources/nheko-16.png" DESTINATION "${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/16x16/apps" RENAME "nheko.png")

cmake/LMDBXX.cmake

@@ -0,0 +1,25 @@
+include(ExternalProject)
+
+#
+# Build lmdbxx.
+#
+
+set(THIRD_PARTY_ROOT ${CMAKE_SOURCE_DIR}/.third-party)
+set(LMDBXX_ROOT ${THIRD_PARTY_ROOT}/lmdbxx)
+
+set(LMDBXX_INCLUDE_DIRS ${LMDBXX_ROOT})
+
+ExternalProject_Add(
+  lmdbxx
+
+  GIT_REPOSITORY https://github.com/bendiken/lmdbxx
+  GIT_TAG 0b43ca87d8cfabba392dfe884eb1edb83874de02
+
+  BUILD_IN_SOURCE 1
+  SOURCE_DIR ${LMDBXX_ROOT}
+  CONFIGURE_COMMAND ""
+  BUILD_COMMAND ""
+  INSTALL_COMMAND ""
+)
+
+include_directories(SYSTEM ${LMDBXX_ROOT})

cmake/MatrixStructs.cmake

@@ -0,0 +1,27 @@
+include(ExternalProject)
+
+#
+# Build matrix-structs.
+#
+
+set(THIRD_PARTY_ROOT ${CMAKE_SOURCE_DIR}/.third-party)
+set(MATRIX_STRUCTS_ROOT ${THIRD_PARTY_ROOT}/matrix_structs)
+
+set(MATRIX_STRUCTS_INCLUDE_DIRS ${MATRIX_STRUCTS_ROOT}/deps)
+
+ExternalProject_Add(
+  MatrixStructs
+
+  GIT_REPOSITORY https://github.com/mujx/matrix-structs
+  GIT_TAG 83be1388e632a43f0570857cb79313c09fb3da0b
+
+  BUILD_IN_SOURCE 1
+  SOURCE_DIR ${MATRIX_STRUCTS_ROOT}
+  CONFIGURE_COMMAND ${CMAKE_COMMAND} -DCMAKE_BUILD_TYPE=Release ${MATRIX_STRUCTS_ROOT}
+  BUILD_COMMAND ${CMAKE_COMMAND} --build ${MATRIX_STRUCTS_ROOT}
+  INSTALL_COMMAND ""
+)
+
+include_directories(SYSTEM ${MATRIX_STRUCTS_ROOT}/deps)
+include_directories(SYSTEM ${MATRIX_STRUCTS_ROOT}/include)
+link_directories(${MATRIX_STRUCTS_ROOT})