On 09/19/2014 06:07 PM, Taylor Braun-Jones wrote:
> On Fri, Sep 19, 2014 at 3:04 PM, Brad King wrote:
>> I think it can be activated by a special format of an entry in
>> ExternalData_URL_TEMPLATES that specifies a lookup key that maps
>> to some kind of custom configuration of a .cmake script to include
>> or command to launch with execute_process.
>
> How about defining new URL scheme like:
>
> externaldatacommand://<*file|module*>/<*command*>
Yes, something along these lines is what I had in mind.
> list(APPEND ExternalData_URL_TEMPLATES
>
> "externaldatacommand://ArtifactoryExternalData/ARTIFACTORY_DOWNLOAD_FILE?ALGO=%(algo)&"
> )
>
> And inside Testing/CMake/ArtifactoryExternalData.cmake it would look like:
>
> function(ARTIFACTORY_DOWNLOAD_FILE file algo hash)
Since CMake does not support variable evaluation in a command name,
this would require configuring a file with code in it to launch for
each entry of this form in the url templates list.
Also CMAKE_MODULE_PATH will not be available to the ExternalData
module when it is launched at build time to do the download. The
include() will have to work with a full path, perhaps stored in
the configured copy of "ExternalData_config.cmake.in". It could
be indexed with a key. Perhaps:
list(APPEND ExternalData_URL_TEMPLATES
"ExternalDataCustomScript://MyFetch/%(algo)/%(hash)"
)
set(ExternalData_CUSTOM_SCRIPT_MyFetch /path/to/MyFetch.cmake)
The script would be include()-ed in place of the current call
to _ExternalData_download_file with the part of the URL after
the "MyFetch/" already parsed into some variable(s).
-Brad
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