added CMakeLists.txt to support building via cmake

CMakeLists.txt

@@ -0,0 +1,53 @@
+cmake_minimum_required(VERSION 3.4)
+project(linenoise C)
+
+include(GNUInstallDirs)
+
+option(LINENOISE_BUILD_EXAMPLE OFF)
+
+# -----------------
+# LIBRARY
+# -----------------
+add_library(${PROJECT_NAME} linenoise.c)
+target_include_directories(${PROJECT_NAME}
+    INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/linenoise>
+)
+target_compile_options(${PROJECT_NAME}
+    PRIVATE -Wall -W
+)
+
+# -----------------
+# EXAMPLE
+# -----------------
+if(LINENOISE_BUILD_EXAMPLE)
+    add_executable(${PROJECT_NAME}-example example.c)
+    target_link_libraries(${PROJECT_NAME}-example
+        PRIVATE ${PROJECT_NAME}
+    )
+    target_compile_options(${PROJECT_NAME}
+        PRIVATE -Wall -W
+    )
+endif()
+
+# -----------------
+# INSTALLATION
+# -----------------
+if(TARGET ${PROJECT_NAME}-example)
+    install (TARGETS ${PROJECT_NAME}-example
+        DESTINATION ${CMAKE_INSTALL_BINDIR}
+    )
+endif()
+
+install (TARGETS ${PROJECT_NAME}
+    EXPORT ${PROJECT_NAME}Config
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}
+)
+
+install (FILES ${CMAKE_CURRENT_SOURCE_DIR}/linenoise.h
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/linenoise/
+)
+
+install(EXPORT ${PROJECT_NAME}Config
+        NAMESPACE ${PROJECT_NAME}::
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+)