Hello all,
I have a set of files in a project that need to be preprocessed through
`envsubst` to render their output. The targets of these templated files
are a mix of different file types, so they aren't rendered to files with
a consistent extension. Further, not all files with those target
extensions need to be rendered from templates. For example:
a.yaml.envsubst // a.yaml should be rendered from this
b.json.envsubst // b.json should be rendered from this
c.json // should not pass through a rendering step
I would like to express this in a make rule. Instinctually, I want to
reach for something like
%: %.envsubst
envsubst < $< > $@
Obviously this rule isn't correct. But I'm a bit at a loss for how to
express what I want through make rules. One approach that I considered
was using `$(shell find ...)` to get a list of these templates and
generate rules for each one. Unfortunately in my case, that would be
quite difficult because one file might go through *multiple*
preprocessing steps:
d.json.envsubst.gz // d.json should be decompressed then rendered
So now I'd need to have some overcomplicated logic to write out the
resulting rules:
d.json: d.json.envsubst
...
d.json.envsubst: d.json.envsubst.gz
...
I'm happy to change the naming scheme of these files for a reasonable
solution, but I'm feeling a bit stuck by the combination that a) files
which should be rendered through `gzip -d` and `envsubst` don't have
consistent target suffixes, b) a final target might go through either or
both of these steps, and c) not every target requires rendering.
Any ideas?
--
Stephen Touset <step...@touset.org>
