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Starlark is a Python-like configuration language originally developed for use in Bazel and since adopted by other tools. Bazel's BUILD and .bzl files are written in a dialect of Starlark properly known as the "Build Language", though it is often simply referred to as "Starlark", especially when emphasizing that a feature is expressed in the Build Language as opposed to being a built-in or "native" part of Bazel. Bazel augments the core language with numerous build-related functions such as glob, genrule, java_binary, and so on.

See the Bazel and Starlark documentation for more details, and the Rules SIG template as a starting point for new rulesets.

To create your first rule, create the file foo.bzl:

When you call the rule function, you must define a callback function. The logic will go there, but you can leave the function empty for now. The ctx argument provides information about the target.

You can load the rule and use it from a BUILD file.

Create a BUILD file in the same directory:

Now, the target can be built:

Even though the rule does nothing, it already behaves like other rules: it has a mandatory name, it supports common attributes like visibility, testonly, and tags.

Before going further, it's important to understand how the code is evaluated.

Update foo.bzl with some print statements:

and BUILD:

ctx.label corresponds to the label of the target being analyzed. The ctx object has many useful fields and methods; you can find an exhaustive list in the API reference.

Query the code:

Make a few observations:

To analyze the targets, use the cquery ("configured query") or the build command:

As you can see, _foo_binary_impl is now called twice - once for each target.

Notice that neither "bzl file evaluation" nor "BUILD file" are printed again, because the evaluation of foo.bzl is cached after the call to bazel query. Bazel only emits print statements when they are actually executed.

To make your rule more useful, update it to generate a file. First, declare the file and give it a name. In this example, create a file with the same name as the target:

If you run bazel build :all now, you will get an error:

Whenever you declare a file, you have to tell Bazel how to generate it by creating an action. Use ctx.actions.write, to create a file with the given content.

The code is valid, but it won't do anything:

The ctx.actions.write function registered an action, which taught Bazel how to generate the file. But Bazel won't create the file until it is actually requested. So the last thing to do is tell Bazel that the file is an output of the rule, and not a temporary file used within the rule implementation.

Look at the DefaultInfo and depset functions later. For now, assume that the last line is the way to choose the outputs of a rule.

Now, run Bazel:

You have successfully generated a file!

To make the rule more useful, add new attributes using the attr module and update the rule definition.

Add a string attribute called username:

Next, set it in the BUILD file:

To access the value in the callback function, use ctx.attr.username. For example:

Note that you can make the attribute mandatory or set a default value. Look at the documentation of attr.string. You may also use other types of attributes, such as boolean or list of integers.

Dependency attributes, such as attr.label and attr.label_list, declare a dependency from the target that owns the attribute to the target whose label appears in the attribute's value. This kind of attribute forms the basis of the target graph.

In the BUILD file, the target label appears as a string object, such as //pkg:name. In the implementation function, the target will be accessible as a Target object. For example, view the files returned by the target using Target.files.

By default, only targets created by rules may appear as dependencies (such as a foo_library() target). If you want the attribute to accept targets that are input files (such as source files in the repository), you can do it with allow_files and specify the list of accepted file extensions (or True to allow any file extension):

The list of files can be accessed with ctx.files.. For example, the list of files in the srcs attribute can be accessed through

If you need only one file, use allow_single_file:

This file is then accessible under ctx.file.:

You can create a rule that generates a .cc file based on a template. Also, you can use ctx.actions.write to output a string constructed in the rule implementation function, but this has two problems. First, as the template gets bigger, it becomes more memory efficient to put it in a separate file and avoid constructing large strings during the analysis phase. Second, using a separate file is more convenient for the user. Instead, use ctx.actions.expand_template, which performs substitutions on a template file.

Create a template attribute to declare a dependency on the template file:

Users can use the rule like this:

If you don't want to expose the template to the end-user and always use the same one, you can set a default value and make the attribute private:

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