Add nightly-only template

README.md

@@ -21,10 +21,12 @@ code compiles with and without any features it may have, and ensures
 that your code works with an older Rust version. You can also
 mix-and-match these checks if you wish.
 
-The repository provides two main templates:
+The repository provides three main templates:
 
  - `default.yml`, which is a highly opinionated default CI that you can
    use for most "normal" Rust projects.
+ - `nightly-only.yml`, which is a highly opinionated default CI that you
+   can use for Rust projects that only support nightly versions of Rust.
  - `install-rust.yml`, a minimal template that just installs Rust and
    has you write out the commands you want CI to run (see
    `default.yml` for inspiration). You can specify a Rust version,
@@ -253,7 +255,7 @@ with
 Then you can tweak it to your heart's desire!
 
 There are some smaller configuration parameters available for `default.yml`
-too:
+too. Most of these also apply to `nightly-only.yml`.
 
 ### Testing on multiple platforms
 
@@ -285,6 +287,20 @@ you would give that version number as the `minrust` parameter to
 `default.yml`. If you wish to disable the MSRV check, set `minrust`
 to `false`.
 
+#### Minimum supported nightly
+
+If you are using the `nightly-only.yml` template, the equivalent of MSRV
+checking is to check that you support some particular "oldest" nightly.
+You can check this by specifying a date for the `min` parameter:
+
+```yaml
+jobs:
+ - template: nightly-only.yml@templates
+   parameters:
+     minrust: <false | YYYY-MM-DD> = false
+```
+
+
 ### Environment variables
 
 ```yaml

nightly-only.yml

@@ -0,0 +1,117 @@
+parameters:
+  min: false
+  setup: []
+  services: {}
+  env: {}
+  cross: true
+  dir: "."
+
+jobs:
+ - job: style
+   displayName: Style linting
+   pool:
+     vmImage: ubuntu-18.04
+   continueOnError: true
+   steps:
+     # latest nightly may not have rustfmt/clippy
+     # we can't check for both:
+     # https://github.com/rust-lang/rustup-components-history/issues/9
+     # but we at least check for one.
+     # rustfmt _seems_ to break most often:
+     - bash: |
+         echo '##vso[task.setvariable variable=nightly]nightly-'$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/rustfmt)
+       displayName: "Determine latest style nightly"
+     - template: install-rust.yml
+       parameters:
+         rust: $(nightly)
+         components:
+           - rustfmt
+           - clippy
+     # Run any user-specific setup steps
+     - ${{ parameters.setup }}
+     - script: cargo fmt --all -- --check
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo fmt --check
+     - script: cargo clippy --all
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo clippy -- -D warnings
+ - job: main
+   displayName: Compile and test
+   dependsOn: []
+   ${{ if eq('true', parameters.cross) }}:
+     strategy:
+       matrix:
+         Linux:
+           vmImage: ubuntu-18.04
+           rust: nightly
+         MacOS:
+           vmImage: macOS-10.15
+           rust: nightly
+         Windows:
+           vmImage: windows-2019
+           rust: nightly
+   ${{ if ne('true', parameters.cross) }}:
+     strategy:
+       matrix:
+         Linux:
+           vmImage: ubuntu-18.04
+           rust: nightly
+   pool:
+     vmImage: $(vmImage)
+   services:
+     ${{ insert }}: ${{ parameters.services }}
+   steps:
+     - template: install-rust.yml
+       parameters:
+         rust: $(rust)
+     # Run any user-specific setup steps
+     - ${{ parameters.setup }}
+     - script: cargo check
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo check
+     - script: cargo check --no-default-features
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo check --no-default-features
+     - script: cargo check --all-features
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo check --all-features
+     - script: cargo test --all-features
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo test
+       env:
+         ${{ insert }}: ${{ parameters.env }}
+     - script: cargo doc --no-deps
+       workingDirectory: ${{ parameters.dir }}
+       displayName: cargo doc
+ - ${{ if ne('false', parameters.min) }}:
+   - job: msrv
+     displayName: "${{ format('Minimum supported Rust nightly: {0}', parameters.min) }}"
+     dependsOn: []
+     # This represents the minimum Rust version supported.
+     # Tests are not run as tests may require newer versions of nightly.
+     pool:
+       vmImage: ubuntu-18.04
+     steps:
+       - template: install-rust.yml
+         parameters:
+           rust: "${{ format('nightly-{0}', parameters.min) }}"
+       # Run any user-specific setup steps
+       - ${{ parameters.setup }}
+       - script: cargo check
+         workingDirectory: ${{ parameters.dir }}
+         displayName: cargo check
+       - script: cargo check --no-default-features
+         workingDirectory: ${{ parameters.dir }}
+         displayName: cargo check --no-default-features
+       - script: cargo check --all-features
+         workingDirectory: ${{ parameters.dir }}
+         displayName: cargo check --all-features
+ - ${{ if ne('', parameters.codecov_token) }}:
+   - template: coverage.yml
+     parameters:
+       token: ${{ parameters.codecov_token }}
+       setup: ${{ parameters.setup }}
+       services: ${{ parameters.services }}
+       env: ${{ parameters.env }}
+       dir: ${{ parameters.dir }}
+       nightly: true