[CMake] Copying directories as post build events without losing parent directory

[Robert Dailey]

On Mon, Dec 7, 2015 at 4:15 PM, Robert Dailey <rcdailey.lists at gmail.com> wrote:
> On Mon, Dec 7, 2015 at 3:59 PM, David Cole <DLRdave at aol.com> wrote:
>> $ cmake -E copy_directory foo bar/foo
>>
>> ?
>>
>>
>> On Mon, Dec 7, 2015 at 4:53 PM, Robert Dailey <rcdailey.lists at gmail.com> wrote:
>>> I have a custom target which runs a command similar to this:
>>>
>>> $ cmake -E copy_directory foo bar
>>>
>>> The problem is that the contents of "foo" are copied inside of "bar",
>>> instead of it creating a directory "bar/foo" and putting the contents
>>> in there.
>>>
>>> Is there a way to make copy_directory behave like this? If not, I
>>> guess my only option is to create a little CMake script that runs
>>> file(INSTALL) to copy the directories like I want.
>>> --
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>
> That's the obvious answer but due to complexity reasons I don't want
> to repeat the destination directory name. I want the copy to be
> inclusive of the source directory name. I'd have to use
> get_filename_component() to find the leaf directory name in the list
> of directories I provide to my function for copying, simply to repeat
> that name in the destination path I build. I want to avoid this.
> Another weirdness is that I like to pass in a list with a mixture of
> directories and files. Think of this is a way for me to pass in a list
> of game data resources that need to be copied to the EXE directory so
> the game can find them and run. I also have to add weird
> if(IS_DIRECTORY) checks so I can tell my custom command to use "copy"
> or "copy_directory".
>
> A simple little install.cmake script that I run is able to do this,
> but as far as complexity goes, it doesn't save me a whole lot:
>
> function( copy_data )
>     if( NOT TARGET copy_data )
>         add_custom_target( copy_data COMMENT "Copying data directories
> and files..." )
>     endif()
>
>     set( data_directories ${ARGN} )
>
>     foreach( data ${data_directories} )
>         get_filename_component( data ${data} ABSOLUTE )
>         set( output_dir "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/$<CONFIGURATION>" )
>         set( install_script "${BUILD_CMAKE_DIR}/scripts/install.cmake" )
>
>         add_custom_command( TARGET copy_data POST_BUILD
>             COMMAND ${CMAKE_COMMAND}
>             ARGS "-DSOURCE=${data}" "-DOUTPUT_DIR=${output_dir}" -P
> "${install_script}"
>         )
>     endforeach()
> endfunction()

Oh and the contents of install.cmake:

file( INSTALL ${SOURCE} DESTINATION ${OUTPUT_DIR} )