pygnulib: progress and some questions (func_emit_autoconf_snippets)

[Dmitry Selyutin]

Hello,

 

this is a kind reminder that python branch is still alive, though it's quite difficult to find a time for coding. :-) Anyway, I think I'll finish the "import" section in about a month: right now I'm slowly processing gnulib-comp.m4 generation part of the code. I have a question regarding a function named func_emit_autoconf_snippets.

 

TL;DR: feel free to skip to ===QUESTIONS=== section if this is a way too long introduction to the topic. :-) The questions mainly target Bruno as the original author, but I'd be very grateful for any help.

 

 

Could you please explain in details how func_emit_autoconf_snippets works? The most important for me is to understand how to map it into the API I've recently implemented: currently pygnulib can create a special object, "module database", which allows to iterate over modules and dependencies very quickly. Basically it is a hash table where each entry contains yet another hash table.

 

 

Given a dependency DEP, it is really easy to iterate over each demander DEM and condition COND like this:

 

for (dem, cond) in db.demanders(dep):

print(dem, cond)

 

One can also iterate over all dependencies of the demander DEM, acquiring each dependency DEP and the condition COND:

 

for (dep, cond) in db.dependencies(dem):

print(dep, cond)

 

So given a set of modules MODULES, I can hopefully obtain all the required information to implement func_emit_autoconf_snippets analogue. However, I can't quite understand how the modules are processed. The questions are followed; they all are relevant only for --conditional-dependencies switch since otherwise the algorithm is trivial (just treat each module as unconditional).

 

 

===QUESTIONS===

1. At line 4260, what's the place where $modules variable gets assigned? The nearest explicit assignment I've found is at line 5298; is it correct that this is the one whose result is used at 4260?

2. What's the logic for dependencies processing, starting at line 4298?

3. Do you have an idea how could the algorithm mapped to the described API, given that I have module database, main modules, tests modules and final modules (and hopefully every other bit of information)? There's no need to check whether module exists, since all the mentioned collections (database and modules lists) contain not strings, but a real module instances.

 

 

Thank you for your help!

 

 

--

With best regards,

Dmitry Selyutin

 

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