On Mon, Sep 22, 2014 at 10:07 AM, Brad King <[email protected]> wrote:

> 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).
>

This all sounds reasonable to me. I'd love to see this land in a future
CMake release. I'm willing to help if you need a tester/reviewer.
-- 

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