Bummer.
I'm at pycon.
Didn't know any other SCons folks are here.
Anyone sprinting?
-Bill
On 03/17/2013 02:50 AM, anatoly techtonik wrote:
Congratulations to Kenny with his lightning talk about parts on PyCon! =)
Now I understand what's going on with it a little bit more and I like
the stuff. It will be awesome to have these slides with examples
online and linked from SCons website. http://parts.tigris.org
I have a long standing idea of teaching SCons to understand the
declarative format (like JSON) that can be used to describe and
compile simple dependencies, such as zlib:
http://wiki.openttd.org/Compiling_on_Windows_using_MinGW#Compiling_zlib
Why the need of the declarative format? To know the inputs and outputs
of the package like zlib and connect them to the inputs and outputs of
other dependencies. Like I know the dependency graph of the package,
but when I look into SCons - there is no way to get that high-level
overview of these. Even low level dependency tree requires a dry run.
Of course, the SCons powers are not squeezable into such format and it
is impossible. But for the purpose of clarity and studying dependency
problems, such format would be very welcome.
For example, there are no _dependency level input_s for zlib - it is
self-contained, but there are can be several outputs. Required output
is affected by some generic (or specific) condition. As a user, I only
know that a zlib is a library, and it is pretty dark to know the
shared/unshared details. I understand that parts already cares about
these underlying details automatically.
So, the question - is it technically feasible with parts to fulfill
this scenario:
- take zlib description in JSON format
- show input and output dependencies of the package
- show user level info about possible outputs
- show low level switches that affect the outputs
- show how these switches are connected to other parts
(dependencies), because some dependencies set these switches and they
can not be changed
- download and compile
In the end it might look like (sorry, not time to polish this):
[switches]
+------+
+------+ |
+------+ | |
| | | [outputs]
[inputs] +----+-+-+-+ +-----------+
+----+ +--shared-+ | |
| part | +=====+ part |
shared ---+ +==static=+=====+ | |
lib +----------+ ^ +-----------+
input |
|
+
line powered when parts
are connected
--
anatoly t.
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