269 lines
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<h1 id="suggest-tests-tool"><a class="header" href="#suggest-tests-tool">Suggest tests tool</a></h1>
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<p>This chapter is about the internals of and contribution instructions for the
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<code>suggest-tests</code> tool. For a high-level overview of the tool, see <a href="../building/suggested.html#x-suggest">this
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section</a>. This tool is currently in a beta
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state and is tracked by <a href="https://github.com/rust-lang/rust/issues/109933">this</a>
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issue on Github. Currently the number of tests it will suggest are very limited
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in scope, we are looking to expand this (contributions welcome!).</p>
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<h2 id="internals"><a class="header" href="#internals">Internals</a></h2>
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<p>The tool is defined in a separate crate
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(<a href="https://github.com/rust-lang/rust/blob/master/src/tools/suggest-tests"><code>src/tools/suggest-tests</code></a>)
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which outputs suggestions which are parsed by a shim in bootstrap
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(<a href="https://github.com/rust-lang/rust/blob/master/src/bootstrap/src/core/build_steps/suggest.rs"><code>src/bootstrap/src/core/build_steps/suggest.rs</code></a>).
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The only notable thing the bootstrap shim does is (when invoked with the <code>--run</code>
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flag) use bootstrap's internal mechanisms to create a new <code>Builder</code> and uses it
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to invoke the suggested commands. The <code>suggest-tests</code> crate is where the fun
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happens, two kinds of suggestions are defined: "static" and "dynamic"
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suggestions.</p>
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<h3 id="static-suggestions"><a class="header" href="#static-suggestions">Static suggestions</a></h3>
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<p>Defined
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<a href="https://github.com/rust-lang/rust/blob/master/src/tools/suggest-tests/src/static_suggestions.rs">here</a>.
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Static suggestions are simple: they are just
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<a href="https://crates.io/crates/glob">globs</a> which map to a <code>x</code> command. In
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<code>suggest-tests</code>, this is implemented with a simple <code>macro_rules</code> macro.</p>
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<h3 id="dynamic-suggestions"><a class="header" href="#dynamic-suggestions">Dynamic suggestions</a></h3>
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<p>Defined
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<a href="https://github.com/rust-lang/rust/blob/master/src/tools/suggest-tests/src/dynamic_suggestions.rs">here</a>.
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These are more complicated than static suggestions and are implemented as
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functions with the following signature: <code>fn(&Path) -> Vec<Suggestion></code>. In other
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words, each suggestion takes a path to a modified file and (after running
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arbitrary Rust code) can return any number of suggestions, or none. Dynamic
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suggestions are useful for situations where fine-grained control over
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suggestions is needed. For example, modifications to the <code>compiler/xyz/</code> path
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should trigger the <code>x test compiler/xyz</code> suggestion. In the future, dynamic
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suggestions might even read file contents to determine if (what) tests should
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run.</p>
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<h2 id="adding-a-suggestion"><a class="header" href="#adding-a-suggestion">Adding a suggestion</a></h2>
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<p>The following steps should serve as a rough guide to add suggestions to
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<code>suggest-tests</code> (very welcome!):</p>
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<ol>
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<li>Determine the rules for your suggestion. Is it simple and operates only on a
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single path or does it match globs? Does it need fine-grained control over
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the resulting command or does "one size fit all"?</li>
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<li>Based on the previous step, decide if your suggestion should be implemented
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as either static or dynamic.</li>
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<li>Implement the suggestion. If it is dynamic then a test is highly recommended,
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to verify that your logic is correct and to give an example of the
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suggestion. See the
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<a href="https://github.com/rust-lang/rust/blob/master/src/tools/suggest-tests/src/tests.rs">tests.rs</a>
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file.</li>
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<li>Open a PR implementing your suggestion. <strong>(TODO: add example PR)</strong></li>
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</ol>
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