[tarantool-patches] [PATCH] use TarantoolConfig instead of FindTarantool

[Konstantin Belyavskiy <k.belyavskiy@tarantool.org>]

Use TarantoolConfig.cmake instead of FindTarantool.cmake and
distribute it within tarantool-dev package.
Module, which requires tarantool id its deps now can simply do:
 find_package(Tarantool CONFIG REQUIRED)
and does not obligate to have FindTarantool.cmake any more.
Tested with following modules:
avro-schema, cbench

Proposal for #3147
---
Ticket: https://github.com/tarantool/tarantool/issues/3147
Branch: https://github.com/tarantool/tarantool/tree/kbelyavs/gh-3147-use-tarantoolconfig-instead-findtarantool
 CMakeLists.txt        |  1 +
 TarantoolConfig.cmake | 44 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)
 create mode 100644 TarantoolConfig.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0cae0f01..f3f002f86 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -218,6 +218,7 @@ set(MODULE_LIBSUFFIX "${CMAKE_SHARED_LIBRARY_SUFFIX}")
 
 install(DIRECTORY DESTINATION ${MODULE_LUADIR})
 install(DIRECTORY DESTINATION ${MODULE_LIBDIR})
+install(FILES TarantoolConfig.cmake DESTINATION cmake)
 
 include(cmake/multilib.cmake)
 
diff --git a/TarantoolConfig.cmake b/TarantoolConfig.cmake
new file mode 100644
index 000000000..f0595c5c3
--- /dev/null
+++ b/TarantoolConfig.cmake
@@ -0,0 +1,44 @@
+# Define GNU standard installation directories
+include(GNUInstallDirs)
+
+macro(extract_definition name output input)
+    string(REGEX MATCH "#define[\t ]+${name}[\t ]+\"([^\"]*)\""
+        _t "${input}")
+    string(REGEX REPLACE "#define[\t ]+${name}[\t ]+\"(.*)\"" "\\1"
+        ${output} "${_t}")
+endmacro()
+
+find_path(TARANTOOL_INCLUDE_DIR tarantool/module.h
+  HINTS ENV TARANTOOL_DIR /usr/local/include
+)
+
+if(TARANTOOL_INCLUDE_DIR)
+    set(_config "-")
+    file(READ "${TARANTOOL_INCLUDE_DIR}/tarantool/module.h" _config0)
+    string(REPLACE "\\" "\\\\" _config ${_config0})
+    unset(_config0)
+    extract_definition(PACKAGE_VERSION TARANTOOL_VERSION ${_config})
+    extract_definition(INSTALL_PREFIX _install_prefix ${_config})
+    unset(_config)
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(TARANTOOL
+    REQUIRED_VARS TARANTOOL_INCLUDE_DIR VERSION_VAR TARANTOOL_VERSION)
+if(TARANTOOL_FOUND)
+    set(TARANTOOL_INCLUDE_DIRS "${TARANTOOL_INCLUDE_DIR}"
+                               "${TARANTOOL_INCLUDE_DIR}/tarantool/"
+        CACHE PATH "Include directories for Tarantool")
+    set(TARANTOOL_INSTALL_LIBDIR "${CMAKE_INSTALL_LIBDIR}/tarantool"
+        CACHE PATH "Directory for storing Lua modules written in Lua")
+    set(TARANTOOL_INSTALL_LUADIR "${CMAKE_INSTALL_DATADIR}/tarantool"
+        CACHE PATH "Directory for storing Lua modules written in C")
+
+    if (NOT TARANTOOL_FIND_QUIETLY AND NOT FIND_TARANTOOL_DETAILS)
+        set(FIND_TARANTOOL_DETAILS ON CACHE INTERNAL "Details about TARANTOOL")
+        message(STATUS "Tarantool LUADIR is ${TARANTOOL_INSTALL_LUADIR}")
+        message(STATUS "Tarantool LIBDIR is ${TARANTOOL_INSTALL_LIBDIR}")
+    endif ()
+endif()
+mark_as_advanced(TARANTOOL_INCLUDE_DIRS TARANTOOL_INSTALL_LIBDIR
+    TARANTOOL_INSTALL_LUADIR)
-- 
2.14.3 (Apple Git-98)