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"""
Defines the postprocessing build rule for the Google Maps APIs.
"""
def maps_assembly_pkg(name, srcs, language, visibility = None):
"""Target to build a post-processed ads-specific GAPIC assembly package.
Explodes a GAPIC assembly package, runs language-specific post-processing, and repackages.
This macro assumes srcs contains in a single input, namely a {{language}}_assembly_pkg target
produced by a gapic-generator build target.
There must be a corresponding postprocessing_{language}.sh script to invoke.
Args:
name: defines the name of the main target
srcs: collection containing exactly 1 build target, namely a
{{language}}_assembly_pkg target produced by gapic-generator
language: the programming language to post-process
(e.g., "java", "csharp", "php", etc.); there must be a matching
post-processin script of the form `postprocessing_{language}.sh
in this package
visibility (optional): marco visibility setting;
(see https://docs.bazel.build/versions/master/skylark/macros.html)
"""
cmd = """
set -eu
tar xzf $(SRCS);
$(location //google/maps:postprocessing_%s) %s;
tar czf $@ %s
"""
dir_name = _extract_path(srcs)
native.genrule(
name = name,
srcs = srcs,
outs = ["%s.tar.gz" % name],
cmd = cmd % (language, dir_name, dir_name),
tools = ["//google/maps:postprocessing_%s" % language],
visibility = visibility,
)
def _extract_path(srcs):
"""Takes the first label in srcs and returns its target name.
Args:
srcs: a collection of build labels of the form "//package/name:target"
Returns:
The first element's target (i.e.- the part after the ":"), else None if empty.
"""
for s in srcs:
toks = s.split(":")
if len(toks) == 2:
return toks[1]
return None
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