MXS-1300: Build MaxCtrl if npm was found

If npm is installed on the local system, try to build MaxCtrl as a part of
the core.

cmake/FindNPM.cmake

@@ -0,0 +1,16 @@
+# Find the npm executable
+#
+# The following variables are set:
+# NPM_FOUND - True if npm was found
+# NPM_EXECUTABLE - Path to npm
+
+find_program(NPM_EXECUTABLE npm)
+
+if (${NPM_EXECUTABLE} MATCHES "NOTFOUND")
+  message(STATUS "Could not find npm")
+  set(NPM_FOUND FALSE CACHE INTERNAL "")
+  unset(NPM_EXECUTABLE)
+else()
+  message(STATUS "Found npm: ${NPM_EXECUTABLE}")
+  set(NPM_FOUND TRUE CACHE INTERNAL "")
+endif()

maxctrl/CMakeLists.txt

@@ -1 +1,13 @@
+find_package(NPM)
+
+if (NPM_FOUND)
+  add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/maxctrl/maxctrl
+    COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/build.sh ${CMAKE_SOURCE_DIR}
+    WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
+  add_custom_target(maxctrl ALL DEPENDS ${CMAKE_BINARY_DIR}/maxctrl/maxctrl)
+  install_script(${CMAKE_BINARY_DIR}/maxctrl/maxctrl core)
+else()
+  message(STATUS "Not building MaxCtrl: npm not found")
+endif()
+
 add_subdirectory(test)

maxctrl/build.sh

@@ -1,5 +1,15 @@
 #/bin/bash
 
+if [ $# -lt 1 ]
+then
+    echo "Usage: $0 SRC"
+    exit 1
+fi
+
+# Copy sources to working directory
+src=$1
+cp -r -t $PWD/maxctrl $src/maxctrl/* && cd $PWD/maxctrl
+
 npm install
 npm install pkg
 node_modules/pkg/lib-es5/bin.js -t node6-linux-x64 .