cmake: use tt

Tarantool CLI - new modern command line utility for managing Tarantool
packages and Tarantool-based applications [1]. It will replace
tarantoolctl some day.

1. https://github.com/tarantool/tt

Author: DifferentialOrange

CMakeLists.txt

@@ -77,6 +77,8 @@ add_custom_target(coveralls
 ## Install ####################################################################
 ###############################################################################
 
+find_package(TTCtl)
+
 if(NOT DEFINED TARANTOOL_INSTALL_LUADIR)
     set(TARANTOOL_INSTALL_LUADIR "${PROJECT_SOURCE_DIR}/.rocks/share/tarantool")
 endif()
@@ -99,9 +101,9 @@ install(
 # Don't include to rockspec as some Tarantool versions (e.g. 2.2 and 2.3)
 # don't have symbols required by "tuple-merger" and "tuple-keydef" modules.
 execute_process(
-    COMMAND bash "-c" "tarantoolctl rocks install tuple-keydef 0.0.2"
+    COMMAND bash "-c" "${TTCTL} rocks install tuple-keydef 0.0.2"
 )
 
 execute_process(
-    COMMAND bash "-c" "tarantoolctl rocks install tuple-merger 0.0.2"
+    COMMAND bash "-c" "${TTCTL} rocks install tuple-merger 0.0.2"
 )

cmake/FindTTCtl.cmake

@@ -0,0 +1,11 @@
+find_program(TTCTL
+    NAMES tt tarantoolctl
+    DOC "Utility for managing Tarantool packages"
+)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(TTCtl
+    REQUIRED_VARS TTCTL
+)
+
+mark_as_advanced(TTCTL)