CI tool usage (#3876)

# Objective

- Original objective was to add doc build warning check to the ci local execution
- I somewhat deviated and changed other things...

## Solution

`cargo run -p ci` can now take more parameters:
* `format` - cargo fmt
* `clippy` - clippy
* `compile-fail` - bevy_ecs_compile_fail_tests tests
* `test` - tests but not doc tests and do not build examples
* `doc-test` - doc tests
* `doc-check` - doc build and warnings
* `bench-check` - check that benches build
* `example-check` - check that examples build
* `lints` - group - run lints and format and clippy
* `doc` - group - run doc-test and doc-check
* `compile` - group - run compile-fail and bench-check and example-check
* not providing a parameter will run everything

Ci is using those when possible:
* `build` jobs now don't run doc tests and don't build examples. it makes this job faster, but doc tests and examples are not built for each architecture target
* `ci` job doesn't run the `compile-fail` part but only format and clippy, taking less time
* `check-benches` becomes `check-compiles` and runs the `compile` tasks. It takes longer. I also fixed how it was using cache
* `check-doc` job is now independent and also run the doc tests, so it takes longer. I commented out the deadlinks check as it takes 2.5 minutes (to install) and doesn't work

.github/bors.toml

@@ -14,7 +14,7 @@ status = [
     "check-unused-dependencies",
     "ci",
     "miri",
-    "check-benches",
+    "check-compiles",
 ]
 
 use_squash_merge = true

.github/workflows/ci.yml

@@ -41,7 +41,8 @@ jobs:
         run: sudo apt-get update; sudo apt-get install --no-install-recommends libasound2-dev libudev-dev
         if: runner.os == 'linux'
       - name: Build & run tests
-        run: cargo test --workspace
+        # See tools/ci/src/main.rs for the commands this runs
+        run: cargo run -p ci -- test
         env:
           CARGO_INCREMENTAL: 0
           RUSTFLAGS: "-C debuginfo=0 -D warnings"
@@ -68,7 +69,7 @@ jobs:
         run: sudo apt-get update; sudo apt-get install --no-install-recommends libasound2-dev libudev-dev libwayland-dev libxkbcommon-dev
       - name: CI job
         # See tools/ci/src/main.rs for the commands this runs
-        run: cargo run -p ci -- nonlocal
+        run: cargo run -p ci -- lints
 
   miri:
     runs-on: ubuntu-latest
@@ -102,7 +103,7 @@ jobs:
           # to raw pointer aliasing rules that we should be trying to uphold.
           MIRIFLAGS: -Zmiri-disable-isolation -Zmiri-ignore-leaks -Zmiri-tag-raw-pointers
 
-  check-benches:
+  check-compiles:
     runs-on: ubuntu-latest
     needs: ci
     steps:
@@ -115,15 +116,17 @@ jobs:
             ~/.cargo/registry/cache/
             ~/.cargo/git/db/
             target/
-          key: ${{ runner.os }}-cargo-check-benches-${{ hashFiles('**/Cargo.toml') }}
+            crates/bevy_ecs_compile_fail_tests/target/
+          key: ${{ runner.os }}-cargo-check-compiles-${{ hashFiles('**/Cargo.toml') }}
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
           override: true
       - name: Install alsa and udev
         run: sudo apt-get update; sudo apt-get install --no-install-recommends libasound2-dev libudev-dev
-      - name: Check Benches
-        run: cd benches && cargo check --benches
+      - name: Check Compile
+        # See tools/ci/src/main.rs for the commands this runs
+        run: cargo run -p ci -- compile
 
   build-wasm:
     strategy:
@@ -292,23 +295,36 @@ jobs:
 
   check-doc:
     runs-on: ubuntu-latest
-    needs: check-markdown-links
-    if: always()
     steps:
       - uses: actions/checkout@v3
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-check-doc-${{ hashFiles('**/Cargo.toml') }}
       - uses: actions-rs/toolchain@v1
         with:
           toolchain: stable
       - name: Install alsa and udev
         run: sudo apt-get update; sudo apt-get install --no-install-recommends libasound2-dev libudev-dev libwayland-dev libxkbcommon-dev
         if: runner.os == 'linux'
-      - name: Installs cargo-deadlinks
-        run: cargo install --force cargo-deadlinks
       - name: Build and check doc
-        run: RUSTDOCFLAGS='-D warnings' cargo doc --workspace --all-features --no-deps --document-private-items
-      - name: Checks dead links
-        run: cargo deadlinks --dir target/doc/bevy
-        continue-on-error: true
+        # See tools/ci/src/main.rs for the commands this runs
+        run: cargo run -p ci -- doc
+        env:
+          CARGO_INCREMENTAL: 0
+          RUSTFLAGS: "-C debuginfo=0"
+      # This currently report a lot of false positives
+      # Enable it again once it's fixed - https://github.com/bevyengine/bevy/issues/1983
+      # - name: Installs cargo-deadlinks
+      #   run: cargo install --force cargo-deadlinks
+      # - name: Checks dead links
+      #   run: cargo deadlinks --dir target/doc/bevy
+      #   continue-on-error: true
 
   check-missing-examples-in-docs:
     runs-on: ubuntu-latest

CONTRIBUTING.md

@@ -280,10 +280,13 @@ If you're new to Bevy, here's the workflow we use:
 1. Fork the `bevyengine/bevy` repository on GitHub. You'll need to create a GitHub account if you don't have one already.
 2. Make your changes in a local clone of your fork, typically in its own new branch.
    1. Try to split your work into separate commits, each with a distinct purpose. Be particularly mindful of this when responding to reviews so it's easy to see what's changed.
-3. To test CI validations locally, run the `cargo run -p ci` command. You can also run sub-commands manually:
-    1. `cargo fmt --all -- --check` (remove `--check` to let the command fix found problems)
-    2. `cargo clippy --workspace --all-targets --all-features -- -D warnings -A clippy::type_complexity`
-    3. `cargo test --all-targets --workspace`
+3. To test CI validations locally, run the `cargo run -p ci` command. This will run most checks that happen in CI, but can take some time. You can also run sub-commands to iterate faster depending on what you're contributing:
+    * `cargo run -p ci -- lints` - to run formatting and clippy
+    * `cargo run -p ci -- test` - to run tests
+    * `cargo run -p ci -- doc` - to run doc tests and doc checks
+    * `cargo run -p ci -- compile` - to check that everything that must compile still does (examples and benches), and that some that shouldn't still don't ([`crates/bevy_ecs_compile_fail_tests`](./crates/bevy_ecs_compile_fail_tests))
+    * to get more informations on commands available and what is run, check the [tools/ci crate](./tools/ci)
+
 4. When working with Markdown (`.md`) files, Bevy's CI will check markdown files (like this one) using [markdownlint](https://github.com/DavidAnson/markdownlint).
 To locally lint your files using the same workflow as our CI:
    1. Install [markdownlint-cli](https://github.com/igorshubovych/markdownlint-cli).

tools/ci/Cargo.toml

@@ -8,3 +8,4 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 xshell = "0.1"
+bitflags = "1.3"

tools/ci/src/main.rs

@@ -1,44 +1,99 @@
 use xshell::{cmd, pushd};
 
+use bitflags::bitflags;
+
+bitflags! {
+    struct Check: u32 {
+        const FORMAT = 0b00000001;
+        const CLIPPY = 0b00000010;
+        const COMPILE_FAIL = 0b00000100;
+        const TEST = 0b00001000;
+        const DOC_TEST = 0b00010000;
+        const DOC_CHECK = 0b00100000;
+        const BENCH_CHECK = 0b01000000;
+        const EXAMPLE_CHECK = 0b10000000;
+    }
+}
+
 fn main() {
     // When run locally, results may differ from actual CI runs triggered by
     // .github/workflows/ci.yml
     // - Official CI runs latest stable
     // - Local runs use whatever the default Rust is locally
 
+    let what_to_run = match std::env::args().nth(1).as_deref() {
+        Some("format") => Check::FORMAT,
+        Some("clippy") => Check::CLIPPY,
+        Some("compile-fail") => Check::COMPILE_FAIL,
+        Some("test") => Check::TEST,
+        Some("doc-test") => Check::DOC_TEST,
+        Some("doc-check") => Check::DOC_CHECK,
+        Some("bench-check") => Check::BENCH_CHECK,
+        Some("example-check") => Check::EXAMPLE_CHECK,
+        Some("lints") => Check::FORMAT | Check::CLIPPY,
+        Some("doc") => Check::DOC_TEST | Check::DOC_CHECK,
+        Some("compile") => Check::COMPILE_FAIL | Check::BENCH_CHECK | Check::EXAMPLE_CHECK,
+        _ => Check::all(),
+    };
+
+    if what_to_run.contains(Check::FORMAT) {
         // See if any code needs to be formatted
         cmd!("cargo fmt --all -- --check")
             .run()
             .expect("Please run 'cargo fmt --all' to format your code.");
+    }
 
+    if what_to_run.contains(Check::CLIPPY) {
         // See if clippy has any complaints.
         // - Type complexity must be ignored because we use huge templates for queries
-    cmd!("cargo clippy --workspace --all-targets --all-features -- -D warnings -A clippy::type_complexity -W clippy::doc_markdown")
+        cmd!("cargo clippy --workspace --all-targets --all-features -- -A clippy::type_complexity -W clippy::doc_markdown -D warnings")
         .run()
         .expect("Please fix clippy errors in output above.");
+    }
 
+    if what_to_run.contains(Check::COMPILE_FAIL) {
         // Run UI tests (they do not get executed with the workspace tests)
         // - See crates/bevy_ecs_compile_fail_tests/README.md
-    {
         let _bevy_ecs_compile_fail_tests = pushd("crates/bevy_ecs_compile_fail_tests")
             .expect("Failed to navigate to the 'bevy_ecs_compile_fail_tests' crate");
-        cmd!("cargo test")
+        cmd!("cargo test --target-dir ../../target")
             .run()
             .expect("Compiler errors of the ECS compile fail tests seem to be different than expected! Check locally and compare rust versions.");
     }
 
-    // These tests are already run on the CI
-    // Using a double-negative here allows end-users to have a nicer experience
-    // as we can pass in the extra argument to the CI script
-    let args: Vec<String> = std::env::args().collect();
-    if args.get(1) != Some(&"nonlocal".to_string()) {
-        // Run tests
-        cmd!("cargo test --workspace")
+    if what_to_run.contains(Check::TEST) {
+        // Run tests (except doc tests and without building examples)
+        cmd!("cargo test --workspace --lib --bins --tests --benches")
             .run()
             .expect("Please fix failing tests in output above.");
+    }
 
-        // Run doc tests: these are ignored by `cargo test`
-        cmd!("cargo test --doc --workspace")
+    if what_to_run.contains(Check::DOC_TEST) {
+        // Run doc tests
+        cmd!("cargo test --workspace --doc")
+            .run()
+            .expect("Please fix failing doc-tests in output above.");
+    }
+
+    if what_to_run.contains(Check::DOC_CHECK) {
+        // Check that building docs work and does not emit warnings
+        std::env::set_var("RUSTDOCFLAGS", "-D warnings");
+        cmd!("cargo doc --workspace --all-features --no-deps --document-private-items")
+            .run()
+            .expect("Please fix doc warnings in output above.");
+    }
+
+    if what_to_run.contains(Check::COMPILE_FAIL) {
+        // Check that benches are building
+        let _benches = pushd("benches").expect("Failed to navigate to the 'benches' folder");
+        cmd!("cargo check --benches --target-dir ../target")
+            .run()
+            .expect("Failed to check the benches.");
+    }
+
+    if what_to_run.contains(Check::EXAMPLE_CHECK) {
+        // Build examples and check they compile
+        cmd!("cargo check --workspace --examples")
             .run()
             .expect("Please fix failing doc-tests in output above.");
     }