bazel-lib/docs/expand_template.md

Public API for expand template

expand_template_rule

expand_template_rule(name, data, is_executable, out, stamp, stamp_substitutions, substitutions,
                     template)

Template expansion

This performs a simple search over the template file for the keys in substitutions, and replaces them with the corresponding values.

Values may also use location templates as documented in expand_locations as well as configuration variables such as $(BINDIR), $(TARGET_CPU), and $(COMPILATION_MODE) as documented in expand_variables.

ATTRIBUTES

Name	Description	Type	Mandatory	Default
name	A unique name for this target.	Name	required
data	List of targets for additional lookup information.	List of labels	optional	[]
is_executable	Whether to mark the output file as executable.	Boolean	optional	False
out	Where to write the expanded file. If unset, the template must be a source file and the output file will be named the same as the template file and outputted to the same workspace-relative path. In this case there will be no pre-declared label for the output file. It can be referenced by the target label instead. This pattern is similar to copy_to_bin but with substitutions on the copy.	Label	optional
stamp	Whether to encode build information into the output. Possible values: - stamp = 1: Always stamp the build information into the output, even in --nostamp builds. This setting should be avoided, since it is non-deterministic. It potentially causes remote cache misses for the target and any downstream actions that depend on the result. - stamp = 0: Never stamp, instead replace build information by constant values. This gives good build result caching. - stamp = -1: Embedding of build information is controlled by the --[no]stamp flag. Stamped targets are not rebuilt unless their dependencies change.	Integer	optional	-1
stamp_substitutions	Mapping of strings to substitutions. There are overlayed on top of substitutions when stamping is enabled for the target. Substitutions can contain $(execpath :target) and $(rootpath :target) expansions, $(MAKEVAR) expansions and {{STAMP_VAR}} expansions when stamping is enabled for the target.	Dictionary: String -> String	optional	{}
substitutions	Mapping of strings to substitutions. Substitutions can contain $(execpath :target) and $(rootpath :target) expansions, $(MAKEVAR) expansions and {{STAMP_VAR}} expansions when stamping is enabled for the target.	Dictionary: String -> String	optional	{}
template	The template file to expand.	Label	required

expand_template

expand_template(name, template, kwargs)

Wrapper macro for expand_template_rule.

PARAMETERS

Name	Description	Default Value
name	name of resulting rule	none
template	the label of a template file, or a list of strings which are lines representing the content of the template.	none
kwargs	other named parameters to expand_template_rule.	none