[Scons-users] Dependencie with Sconscripts and builder's environment

[Vasily]

Maybe varlist should be taken into account for all actions then? What's the
motivation for it working only for some actions but not for other?
12 окт. 2016 г. 10:12 пользователь "Dirk Bächle" <tshortik at gmx.de> написал:

> Hi Albert,
>
> On 12.10.2016 01:27, Albert Arquer wrote:
>
>> Hi Dirk,
>>
>> sorry for all the questions but I am not that experienced in python.
>>
>> I have been looking around the scons sources and I have found the
>> get_presig function implemented in FunctionAction.
>>
>> However my question is, how can I overrinde this class from my
>> sconscripts? Modifying the scons libraries is not an option...
>>
>>
> okay...what you basically need is the knowledge that functions are
> first-class objects in Python. So you can assign them and treat them in the
> same way as normal variables. So, in your SConscript you do
>
>     import SCons.Action
>     import SCons.Builder
>
>     def myBuildMethod():
>         ...
>
>     # Create Action
>     myFuncAct = SCons.Action.Action(myBuildMethod)
>     # Get at the original presig function
>     origPresig = myFuncAct.get_presig
>
>     # Define our own version of it, where we append the variable of
> interest
>     def wrappedPresig():
>         return origPresig + env.subst("$COMMAND")
>
>     # Set this as our new presig method
>     myFuncAct.get_presig = wrappedPresig
>
>     # Now create a proper Builder with our monkey-patched presig function
>     myBuilder = SCons.Builder.Builder(myFuncAct)
>
>
> , all from the top of my head and untested. ;)
> I hope this helps you further already, but other Python experts might
> chime in on this as well.
>
> Best regards,
>
> Dirk
>
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