WIP: Speed up PR feedback

This drops us down to just a handlful of jobs, allowing us to full
parallelism (github caps max parallel jobs).

There is a balance in what to run.  We should consider what is most
likely to break for the widest variety of PRs.  Contributors that expect
an uncovered case to fail can always specify `@bors try`

Motivation
- Mac is similar enough to Linux, we only need to run one of them and
  Linux has more parallel runners on Github.
- Since we deal with `OsStr`, test Windows because its different than
  the others.
- People are most likely to make changes on `stable` and break support
  for MSRV, so we should verify that
- Still test on `stable` to not block feedback if we run into problems
  with dependencies and our MSRV run.
- On the other hand, beta and nightly are less likely to break on an
  individual PR.

This is depednent on us using bors to run the ci-full before merging
into master.

Fixes #2801

.github/workflows/ci-full.yml

@@ -0,0 +1,235 @@
+name: CI Full
+on:
+  push:
+    branches: [master, staging, trying]
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+jobs:
+  ci-full:
+    name: CI Full
+    needs: [test, wasm, lint]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Done
+        run: exit 0
+  test:
+    name: Tests
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [1.54.0, stable, beta]
+        os: [windows-latest, macos-latest, ubuntu-latest]
+        target:
+          - i686-pc-windows-msvc
+          - x86_64-pc-windows-msvc
+          - i686-pc-windows-gnu
+          - x86_64-pc-windows-gnu
+          - x86_64-unknown-linux-gnu
+          - i686-unknown-linux-gnu
+          - x86_64-apple-darwin
+        features:
+          - none
+          - all
+          - release
+        exclude:
+          - features: release
+            rust: stable
+          - features: release
+            rust: beta
+          - os: windows-latest
+            target: x86_64-apple-darwin
+          - os: windows-latest
+            target: x86_64-unknown-linux-gnu
+          - os: windows-latest
+            target: i686-unknown-linux-gnu
+          - os: macos-latest
+            target: i686-pc-windows-msvc
+          - os: macos-latest
+            target: x86_64-pc-windows-msvc
+          - os: macos-latest
+            target: i686-pc-windows-gnu
+          - os: macos-latest
+            target: x86_64-pc-windows-gnu
+          - os: macos-latest
+            target: x86_64-unknown-linux-gnu
+          - os: macos-latest
+            target: i686-unknown-linux-gnu
+          - os: ubuntu-latest
+            target: i686-pc-windows-msvc
+          - os: ubuntu-latest
+            target: x86_64-pc-windows-msvc
+          - os: ubuntu-latest
+            target: i686-pc-windows-gnu
+          - os: ubuntu-latest
+            target: x86_64-pc-windows-gnu
+          - os: ubuntu-latest
+            target: x86_64-apple-darwin
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          override: true
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install linker
+        if: matrix.target == 'i686-pc-windows-gnu'
+        uses: egor-tensin/setup-mingw@v2
+        with:
+          platform: x86
+      - name: Install linker
+        if: matrix.target == 'x86_64-pc-windows-gnu'
+        uses: egor-tensin/setup-mingw@v2
+      - name: Install linker
+        if: matrix.target == 'i686-unknown-linux-gnu'
+        run: |
+          sudo apt-get update
+          sudo apt-get install gcc-multilib
+      - name: Test almost no features
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'none'
+        with:
+          command: test
+          args: --target ${{ matrix.target }} --no-default-features --features "std cargo" -p clap:3.0.0-beta.4
+      - name: Test all features
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'all'
+        with:
+          command: test
+          args: --target ${{ matrix.target }} --features "wrap_help yaml regex"
+      - name: Check debug
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'all'
+        with:
+          command: check
+          args: --target ${{ matrix.target }} --features "wrap_help yaml regex debug"
+      - name: Test release
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'release'
+        with:
+          command: test
+          args: --target ${{ matrix.target }} --features "wrap_help yaml regex" --release
+  nightly:
+    name: Nightly Tests
+    strategy:
+      fail-fast: false
+      matrix:
+        features:
+          - none
+          - all
+          - release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Test almost no features
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'none'
+        with:
+          command: test
+          args: --no-default-features --features "std cargo" -p clap:3.0.0-beta.4
+      - name: Test all features
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'all'
+        with:
+          command: test
+          args: --features "wrap_help yaml regex"
+      - name: Check debug
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'all'
+        with:
+          command: check
+          args: --features "wrap_help yaml regex debug"
+      - name: Test release
+        uses: actions-rs/cargo@v1
+        if: matrix.features == 'release'
+        with:
+          command: test
+          args: --features "wrap_help yaml regex" --release
+  wasm:
+    name: Wasm Check
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        target: [wasm32-unknown-unknown, wasm32-wasi]
+    steps:
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: 1.54.0
+          target: ${{ matrix.target }}
+          override: true
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Check
+        uses: actions-rs/cargo@v1
+        with:
+          command: check
+          args: --target ${{ matrix.target }} --features "yaml regex"
+  lint:
+    name: Linting
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt, clippy
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Clippy for almost no features
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --no-default-features --features "std cargo" -p clap:3.0.0-beta.4
+      - name: Clippy for all features
+        uses: actions-rs/cargo@v1
+        with:
+          command: clippy
+          args: --features "wrap_help yaml regex" -- -D warnings
+      - name: Format check
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: -- --check
+  coverage:
+    name: Coverage
+    continue-on-error: true
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install rust
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          components: llvm-tools-preview
+          override: true
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Install llvm-cov
+        uses: actions-rs/[email protected]
+        with:
+          crate: cargo-llvm-cov
+          version: 0.1.0-alpha.4
+          use-tool-cache: true
+      - name: Coverage
+        uses: actions-rs/cargo@v1
+        with:
+          command: llvm-cov
+          args: --features "wrap_help yaml regex" --lcov --output-path lcov.info
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          path-to-lcov: lcov.info
+          github-token: ${{ secrets.github_token }}