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https://github.com/bazel-contrib/bazel-lib
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70 lines
3.7 KiB
Markdown
70 lines
3.7 KiB
Markdown
# Aspect's Bazel helpers library
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Base Starlark libraries and basic Bazel rules which are useful for constructing rulesets and BUILD files.
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This module depends on [bazel-skylib](https://github.com/bazelbuild/bazel-skylib).
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In theory all these utilities could be upstreamed to bazel-skylib, but the declared scope of that project
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is narrow and it's very difficult to get anyone's attention to review PRs there.
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bazel-lib is just a part of what Aspect provides:
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- _Need help?_ This ruleset has support provided by https://aspect.dev.
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- See our other Bazel rules: https://github.com/aspect-build
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## Installation
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Installation instructions are included on each release:
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<https://github.com/aspect-build/bazel-lib/releases>
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To use a commit rather than a release, you can point at any SHA of the repo.
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For example to use commit `abc123`:
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1. Replace `url = "https://github.com/aspect-build/bazel-lib/releases/download/v0.1.0/bazel-lib-v0.1.0.tar.gz"`
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with a GitHub-provided source archive like
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`url = "https://github.com/aspect-build/bazel-lib/archive/abc123.tar.gz"`
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1. Replace `strip_prefix = "bazel-lib-0.1.0"` with `strip_prefix = "bazel-lib-abc123"`
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1. Update the `sha256`. The easiest way to do this is to comment out the line, then Bazel will
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print a message with the correct value.
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> Note that GitHub source archives don't have a strong guarantee on the sha256 stability, see
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> <https://github.blog/2023-02-21-update-on-the-future-stability-of-source-code-archives-and-hashes>
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# Public API
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## Copying files
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- [copy_directory](docs/copy_directory.md) Copies directories to another package.
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- [copy_file](docs/copy_file.md) Copies files to another package.
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- [copy_to_bin](docs/copy_to_bin.md) Copies a source file to output tree at the same workspace-relative path.
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- [copy_to_directory](docs/copy_to_directory.md) Copies and arranges files and directories into a new directory.
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- [write_source_files](docs/write_source_files.md) Write to one or more files or folders in the source tree. Stamp out tests that ensure the sources exist and are up to date.
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## Transforming files
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- [jq](docs/jq.md) A toolchain and custom rule for running [jq](https://stedolan.github.io/jq/), a tool that is "like sed for json".
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- [yq](docs/yq.md) A toolchain and custom rule for running [yq](https://github.com/mikefarah/yq), a "YAML, JSON and XML processor".
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## Manipulating paths
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- [directory_path](docs/directory_path.md) Provide a label to reference some path within a directory, via DirectoryPathInfo.
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- [output_files](docs/output_files.md) Forwards a subset of the files (via the DefaultInfo provider) from a given target's DefaultInfo or OutputGroupInfo.
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## Writing rules
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- [expand_make_vars](docs/expand_make_vars.md) Perform make variable and location substitions in strings..
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- [expand_template](docs/expand_template.md) Substitute templates with make variables, location resolves, stamp variables, and arbitrary strings.
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- [paths](docs/paths.md) Useful path resolution methods.
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- [transitions](docs/transitions.md) Transition sources to a provided platform.
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- [lists](docs/lists.md) Functional-style helpers for working with list data structures.
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- [utils](docs/utils.md) Various utils for labels and globs.
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- [params_file](docs/params_file.md) Generate encoded params file from a list of arguments.
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- [repo_utils](docs/repo_utils.md) Useful methods for repository rule implementations.
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- [run_binary](docs/run_binary.md) Like skylib's run_binary but adds directory output support.
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- [stamping](docs/stamping.md) Support version stamping in custom rules.
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- [base64](docs/base64.md) Starlark Base64 encoder & decoder.
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## Generating documentation
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- [docs](docs/docs.md) Rules for generating docs and stamping tests to ensure they are up to date.
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