Check for additional platforms does not work with complex jinja constructs

[jpfeuffer]

The following is just too simple:

bioconda-recipes/scripts/check-for-additional-platforms.sh

Lines 31 to 34 in 3d67ef3

	additional_platforms=$(cat $file \
	| sed -E 's/(.*)\{%(.*)%\}(.*)/# \1\2\3/g' \
	| tr -d '{{' | tr -d '}}' \
	| ${HOME}/bin/yq '.extra.additional-platforms[]')

This will fail for anything that uses multiline jinja functions:

{% set deps = [
    "eigen >=3.4.0"
]
+ (["libgomp", "sysroot_linux-64 =2.17"] if linux else [])
+ (["llvm-openmp"] if osx else [])
%}

[jpfeuffer]

Sure, one could workaround this. But if you are promising to support jinja, then this should work or prominently be documented.
A recipe with this renders fine with conda render.

[aliciaaevans]

I agree with you in principle. Very few Bioconda recipes are using jinja to that extent, though, so that's why we have not run into this before. Is your example something that's in an existing recipe or PR? Something like - llvm-openmp # [osx] is more commonly used and easier to read.

The purpose of that script is to have a quick way to skip the rest of the build so we don't keep runners (especially osx arm) busy installing conda, python, etc. As long as we can keep it reasonably quick, I'm on board with any suggestions for improving the jinja support. (And if not, updating documentation of course.)

[jpfeuffer]

Well, I am not really using it now since it does not work but my idea was to simplify the recipe to workaround other bugs of conda-build with subpackages.
50f0f24
I have to essentially specify the same dependencies for each subpackage since conda-build does not handle run-exports from subpackages correctly.
There have been cases already, where due to mistakes those dependencies in the subpackages became out-of-sync. Therefore a jinja list approach as in the commit above would have been nice.

Although I have discarded this approach due to even more bugs in conda-build, I have the feeling that there is a better way to get the additional platforms somehow.