|  | book_path: /_book.yaml | 
|  | project_path: /_project.yaml | 
|  |  | 
|  | title: Extending Bazel | 
|  | landing_page: | 
|  | header: | 
|  | hide_lower_section: true | 
|  | custom_css_path: /bazel.css | 
|  |  | 
|  | rows: | 
|  | # Hero Row | 
|  | - options: | 
|  | - description-50 | 
|  | - hero | 
|  | - large-headings | 
|  | - no-image-background | 
|  | classname: bazel-hero bazel-hero-full-bleed-light | 
|  | items: | 
|  | - classname: bazel-hero | 
|  | image_path: /images/extend.svg | 
|  | heading: > | 
|  | Extending Bazel | 
|  | description: > | 
|  | Maximize Bazel's power through advanced concepts and extensions. | 
|  |  | 
|  | # Jumpdown Row | 
|  | - options: | 
|  | - centered-header | 
|  | - large-headings | 
|  | - padding-large | 
|  | classname: bazel-jumpdown-row | 
|  | custom_html: > | 
|  | <a href="#concepts">Concepts<span class="material-icons">arrow_downward</span> | 
|  | </a> | 
|  | <a href="#writing-rules">Writing rules<span class="material-icons"> | 
|  | arrow_downward</span></a> | 
|  | <a href="#distributing-rules">Distributing rules<span class="material-icons">arrow_downward</span></a> | 
|  | <a href="#design-docs">Design docs<span class="material-icons">arrow_downward</span></a> | 
|  | <a href="#apis">APIs<span class="material-icons">arrow_downward</span></a> | 
|  |  | 
|  | # Concepts row | 
|  | - options: | 
|  | - centered-header | 
|  | - cards | 
|  | background: white | 
|  | heading: Concepts | 
|  | description: > | 
|  | Understand concepts like rules and macros to extend Bazel's capabilities. | 
|  | items_across: 4 | 
|  | items: | 
|  | - heading: Overview | 
|  | path: /extending/concepts/ | 
|  | - heading: Rules | 
|  | path: /extending/rules | 
|  | - heading: Macros | 
|  | path: /extending/macros | 
|  | - heading: Depsets | 
|  | path: /extending/depsets | 
|  | - heading: Aspects | 
|  | path: /extending/aspects | 
|  | - heading: Repository rules | 
|  | path: /extending/repo | 
|  | - heading: Configurations | 
|  | path: /extending/config | 
|  |  | 
|  | # Writing rules row | 
|  | - options: | 
|  | - centered-header | 
|  | - cards | 
|  | background: white | 
|  | heading: Writing rules | 
|  | description: > | 
|  | Write custom rules and macros to customize Bazel to your needs. | 
|  | items_across: 4 | 
|  | items: | 
|  | - heading: Creating a rule | 
|  | path: /rules/rules-tutorial | 
|  | - heading: Creating a macro | 
|  | path: /rules/macro-tutorial | 
|  | - heading: Creating custom verbs | 
|  | path: /rules/verbs-tutorial | 
|  | - heading: Starlark language | 
|  | path: /rules/language | 
|  | - heading: Starlark style guide | 
|  | path: /rules/bzl-style | 
|  | - heading: Challenges | 
|  | path: /rules/challenges | 
|  | - heading: Writing rules for Windows | 
|  | path: /rules/windows | 
|  | - heading: Example rules | 
|  | path: https://github.com/bazelbuild/examples/tree/HEAD/rules | 
|  |  | 
|  | # Distributing rules row | 
|  | - options: | 
|  | - centered-header | 
|  | - cards | 
|  | background: white | 
|  | heading: Distributing rules | 
|  | description: > | 
|  | Share your custom rules to your project or the Bazel community. | 
|  | items_across: 4 | 
|  | items: | 
|  | - heading: Testing rules | 
|  | path: /rules/testing | 
|  | - heading: Lint | 
|  | path: https://github.com/bazelbuild/buildtools/tree/master/buildifier | 
|  | - heading: Optimizing performance | 
|  | path: /rules/performance | 
|  | - heading: Deploy rules | 
|  | path: /rules/deploying | 
|  | - heading: Document rules with Stardoc | 
|  | path: https://github.com/bazelbuild/stardoc | 
|  |  | 
|  | # Design docs row | 
|  | - options: | 
|  | - centered-header | 
|  | - cards | 
|  | background: white | 
|  | heading: Design docs | 
|  | description: > | 
|  | Academic or conceptual materials on advanced Bazel concepts. | 
|  | items_across: 4 | 
|  | items: | 
|  | - heading: Platforms | 
|  | path: /extending/platforms | 
|  | - heading: Execution groups | 
|  | path: /extending/exec-groups | 
|  | - heading: Toolchains | 
|  | path: /extending/toolchains | 
|  |  | 
|  | # APIs row | 
|  | - options: | 
|  | - centered-header | 
|  | - cards | 
|  | background: white | 
|  | heading: APIs | 
|  | description: > | 
|  | Connect Bazel with these API libraries. | 
|  | items_across: 4 | 
|  | items: | 
|  | - heading: Build file API | 
|  | path: /rules/lib/starlark-overview |