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130 lines
3.7 KiB
Python
130 lines
3.7 KiB
Python
"""Public API for jq"""
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load("//lib/private:jq.bzl", _jq_lib = "jq_lib")
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_jq_rule = rule(
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attrs = _jq_lib.attrs,
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implementation = _jq_lib.implementation,
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toolchains = ["@aspect_bazel_lib//lib:jq_toolchain_type"],
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)
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def jq(name, srcs, filter = None, filter_file = None, args = [], out = None, **kwargs):
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"""Invoke jq with a filter on a set of json input files.
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For jq documentation, see https://stedolan.github.io/jq/.
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To use this rule you must register the jq toolchain in your WORKSPACE:
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```starlark
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load("@aspect_bazel_lib//lib:repositories.bzl", "register_jq_toolchains")
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register_jq_toolchains()
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```
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Usage examples:
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```starlark
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load("@aspect_bazel_lib//lib:jq.bzl", "jq")
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# Remove fields from package.json
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jq(
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name = "no_dev_deps",
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srcs = ["package.json"],
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filter = "del(.devDependencies)",
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)
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# Merge bar.json on top of foo.json
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jq(
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name = "merged",
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srcs = ["foo.json", "bar.json"],
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filter = ".[0] * .[1]",
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args = ["--slurp"],
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out = "foobar.json",
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)
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# Long filters can be split over several lines with comments
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jq(
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name = "complex",
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srcs = ["a.json", "b.json"],
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filter = \"\"\"
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.[0] as $a
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# Take select fields from b.json
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| (.[1] | {foo, bar, tags}) as $b
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# Merge b onto a
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| ($a * $b)
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# Combine 'tags' array from both
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| .tags = ($a.tags + $b.tags)
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# Add new field
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+ {\\\"aspect_is_cool\\\": true}
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\"\"\",
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args = ["--slurp"],
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)
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# Load filter from a file
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jq(
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name = "merged",
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srcs = ["foo.json", "bar.json"],
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filter_file = "filter.txt",
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args = ["--slurp"],
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out = "foobar.json",
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)
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# Convert genquery output to json
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genquery(
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name = "deps",
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expression = "deps(//some:target)",
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scope = ["//some:target"],
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)
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jq(
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name = "deps_json",
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srcs = [":deps"],
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args = [
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"--raw-input",
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"--slurp",
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],
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filter = "{ deps: split(\"\\n\") | map(select(. | length > 0)) }",
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)
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# With --stamp, causes properties to be replaced by version control info.
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jq(
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name = "stamped",
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srcs = ["package.json"],
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filter = "|".join([
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# Don't directly reference $STAMP as it's only set when stamping
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# This 'as' syntax results in $stamp being null in unstamped builds.
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"$ARGS.named.STAMP as $stamp",
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# Provide a default using the "alternative operator" in case $stamp is null.
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".version = ($stamp.BUILD_EMBED_LABEL // \"<unstamped>\")",
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]),
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)
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```
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Args:
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name: Name of the rule
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srcs: List of input files
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filter: Filter expression (https://stedolan.github.io/jq/manual/#Basicfilters).
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Subject to stamp variable replacements, see [Stamping](./stamping.md).
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When stamping is enabled, a variable named "STAMP" will be available in the filter.
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Be careful to write the filter so that it handles unstamped builds, as in the example above.
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filter_file: File containing filter expression (alternative to `filter`)
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args: Additional args to pass to jq
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out: Name of the output json file; defaults to the rule name plus ".json"
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**kwargs: Other common named parameters such as `tags` or `visibility`
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"""
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default_name = name + ".json"
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if not out and not default_name in srcs:
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out = default_name
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_jq_rule(
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name = name,
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srcs = srcs,
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filter = filter,
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filter_file = filter_file,
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args = args,
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out = out,
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**kwargs
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)
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