I have 100+ files with .idl extension and I would like to use these to generate C and C++ headers. The IDL files are considered sources and the auto-generated headers are not checked in to the repo.

Is there a way in Bazel to glob all files with .idl extension in a directory and generate corresponding headers?

The unrolled shell commands would look something like:

custom_tool ABC.idl -o out/ABC.h
custom_tool DEF.idl -o out/DEF.h
custom_tool ABC.idl -o out/ABC.hpp --cpp
custom_tool DEF.idl -o out/DEF.hpp --cpp
custom_tool ABC.idl -o out/ABC_skel.h --skel
custom_tool DEF.idl -o out/DEF_skel.h --skel
custom_tool ABC.idl -o out/ABC_skel.hpp --cpp --skel
custom_tool DEF.idl -o out/DEF_skel.hpp --cpp --skel
...

I was hoping to use genrule in an Android.bp file but I would be OK with a separate .bzl file to help with the custom commands.

I’m stuck on creating the outs list/filegroup which resembles the globed srcs filegroup of IDLs.