cmake: package_helper: add -R option to run additional commands

The 'package_helper.cmake' script is used to load a certain subset of
Zephyr modules, as required by the caller. Some use cases may require
additional commands to be executed in the same context after the modules
have been loaded, because not enough information is reported or saved
in the build directory by default.

This patch adds a new '-R' option to 'package_helper.cmake', which
allows the caller to specify a script to be executed in the current
context after the modules have been loaded.

Signed-off-by: Luca Burelli <l.burelli@arduino.cc>

Author: pillo79

cmake/package_helper.cmake

@@ -19,6 +19,9 @@
 # The build directory will default to current working directory but can be
 # controlled with: '-B <path-to-build>'
 #
+# After the modules have been loaded, additional commands can be optionally
+# executed in the current context by providing the '-R <path-to-script>' option.
+#
 # For example, if you were invoking CMake for 'hello_world' sample as:
 #   $ cmake -DBOARD=<board> -B build -S samples/hello_world
 #
@@ -49,10 +52,12 @@ foreach(i RANGE ${CMAKE_ARGC})
   if(CMAKE_ARGV${i} MATCHES "^-B(.*)")
     set(argB ${CMAKE_MATCH_1})
     set(argB_index ${i})
-  elseif()
   elseif(CMAKE_ARGV${i} MATCHES "^-S(.*)")
     set(argS_index ${i})
     set(argS ${CMAKE_MATCH_1})
+  elseif(CMAKE_ARGV${i} MATCHES "^-R(.*)")
+    set(argR_index ${i})
+    set(argR ${CMAKE_MATCH_1})
   endif()
 endforeach()
 
@@ -76,6 +81,16 @@ if(DEFINED argS_index)
   endif()
 endif()
 
+if(DEFINED argR_index)
+  if(DEFINED argR)
+    set(RUN_SCRIPT ${argR})
+  else()
+    # value of -R follows in next index
+    math(EXPR argR_value_index "${argR_index} + 1")
+    set(RUN_SCRIPT ${CMAKE_ARGV${argR_value_index}})
+  endif()
+endif()
+
 if(NOT DEFINED APPLICATION_SOURCE_DIR)
   message(FATAL_ERROR
     "Source directory not defined, please use '-S <path-to-source>' to the "
@@ -99,3 +114,7 @@ endif()
 
 string(REPLACE ";" "," MODULES "${MODULES}")
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE} COMPONENTS zephyr_default:${MODULES})
+
+if (DEFINED RUN_SCRIPT)
+  include(${RUN_SCRIPT})
+endif()