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"""Build macro for libzip."""
# forked from kythe/kythe/tools/build_rules/expand_template.bzl
def _expand_template_impl(ctx):
ctx.actions.expand_template(
template = ctx.file.template,
output = ctx.outputs.out,
substitutions = ctx.attr.substitutions,
)
expand_template = rule(
attrs = {
"out": attr.output(mandatory = True),
"substitutions": attr.string_dict(mandatory = True),
"template": attr.label(
mandatory = True,
allow_single_file = True,
),
},
output_to_genfiles = True,
implementation = _expand_template_impl,
)
def cmake_substitutions(vars, defines = {}):
"""Returns a dict of template substitutions combining `vars` and `defines`.
Args:
vars: will be turned into a dict replacing `${key}` and `@key@` with `value`.
defines: will be turned into a dict replacing `#cmakedefine` with `#define {value}`
if present is true, otherwise `/* #undef %s /*`.
Returns:
substitutions
"""
subs = {}
for key, value in vars.items():
subs["${%s}" % (key,)] = str(value) if value != None else ""
subs["@%s@" % (key,)] = str(value) if value != None else ""
# TODO(shahms): Better handling of #cmakedefine delimiters and line endings to
# avoid the prefix-substitution problem.
# Potentially allow value to be: True, False, None or string.
# True/False => Same as current
# None => assume no suffix value, include \n in sub and replacement
# string => use string to lookup in vars and assume ${} or @@ tail?
for macro, present in defines.items():
if present:
subs["#cmakedefine %s" % macro] = "#define %s" % macro
else:
subs["#cmakedefine %s" % macro] = "/* #undef %s */" % macro
return subs
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