meta: add Azure Pipelines CI config (#191)

* First draft of Azure Pipelines CI config

You'll have to follow the instructions over at
https://github.com/crate-ci/azure-pipelines to get it fully set up.
Might also run into some weirdness with having to change the "default"
branch once merged. But 🎉

Oh, yeah, and need to also update Cargo.toml, README badge, etc.

* Also check benchmarks

* Pool is set per job, not per stage

* Not a template anymore

* Use correct service connection name

* Disable readme doctest pending rewrite

* Fully remove old doctest readme

* Don't run cargo check yet

We need support for _not_ running with `--all-features` due to the
nightly requirement for async/await which is enabled by a feature in
`tracing`. This will eventually land with
https://github.com/crate-ci/azure-pipelines/pull/42.

* Hack dependency chain

Closes #177

.travis.yml

@@ -25,9 +25,6 @@ jobs:
     install: rustup component add rustfmt-preview
     name: "rustfmt"
     rust: stable
-  - script: cargo test --features=doctest-readme --all
-    name: "doctest readme"
-    rust: nightly
   - script: (cd tracing-futures/test_std_future && cargo test)
     name: "futures nightly"
     rust: nightly

azure-pipelines.yml

@@ -0,0 +1,89 @@
+stages:
+# Blocked on https://github.com/crate-ci/azure-pipelines/pull/42
+# See also https://github.com/tokio-rs/tracing/pull/191#issuecomment-513872071
+# When we bring these back, add check as a dependency for the other stages
+# - stage: check
+#   displayName: Compilation check
+#   dependsOn: []
+#   jobs:
+#     - template: azure/cargo-check.yml@templates
+#       parameters:
+#         name: cargo_check
+#         benches: true
+# # This represents the minimum Rust version supported.
+# # Tests are not run as tests may require newer versions of rust.
+# - stage: msrv
+#   displayName: "Minimum supported Rust version"
+#   dependsOn: []
+#   jobs:
+#     - template: azure/cargo-check.yml@templates
+#       parameters:
+#        rust: 1.34.0
+ - stage: custom
+   displayName: "Special tests"
+   # dependsOn: check
+   dependsOn: []
+   jobs:
+     - job: custom_stable
+       pool:
+         vmImage: ubuntu-16.04
+       displayName: "Stable custom tests"
+       steps:
+         - template: azure/install-rust.yml@templates
+           parameters:
+            rust: stable
+         - bash: cd tracing/test-log-support && cargo test
+           displayName: "Test log support"
+         - bash: cd tracing/test_static_max_level_features && cargo test
+           displayName: "Test static max level features"
+     - job: custom_nightly
+       pool:
+         vmImage: ubuntu-16.04
+       displayName: "Nightly custom tests"
+       continueOnError: true
+       steps:
+         - template: azure/install-rust.yml@templates
+           parameters:
+            rust: nightly
+         # TODO: add back README doctest
+         # https://github.com/tokio-rs/tracing/pull/191#issuecomment-513394436
+         - bash: cd tracing-futures/test_std_future && cargo test
+           displayName: "Test std::future support for tracing-futures"
+ - stage: style
+   displayName: Style linting
+   # dependsOn: check
+   dependsOn: []
+   jobs:
+    - template: azure/rustfmt.yml@templates
+      parameters:
+        name: rustfmt
+    - template: azure/rustfmt.yml@templates
+      parameters:
+        name: rustfmt_beta
+        rust: beta
+        allow_fail: true
+    - template: azure/cargo-check.yml@templates
+      parameters:
+        name: warning_free
+        err_on_warn: true
+        allow_fail: true
+ - stage: test
+   displayName: Test suite
+   # dependsOn: check
+   dependsOn: []
+   jobs:
+     - template: azure/tests.yml@templates
+ - stage: coverage
+   displayName: Code coverage
+   dependsOn: test
+   jobs:
+     - template: azure/coverage.yml@templates
+       parameters:
+         codecov_token: $(CODECOV_TOKEN_SECRET)
+
+resources:
+  repositories:
+    - repository: templates
+      type: github
+      name: crate-ci/azure-pipelines
+      endpoint: tracing

tracing/Cargo.toml

@@ -53,8 +53,6 @@ release_max_level_info  = []
 release_max_level_debug = []
 release_max_level_trace = []
 
-doctest-readme = []
-
 [[bench]]
 name = "subscriber"
 harness = false

tracing/src/lib.rs

@@ -1,7 +1,6 @@
 #![doc(html_root_url = "https://docs.rs/tracing/0.1.3")]
 #![deny(missing_debug_implementations, missing_docs, unreachable_pub)]
 #![cfg_attr(test, deny(warnings))]
-#![cfg_attr(feature = "doctest-readme", feature(external_doc))]
 
 //! A scoped, structured logging and diagnostics system.
 //!
@@ -399,9 +398,6 @@ pub mod level_filters;
 pub mod span;
 pub mod subscriber;
 
-#[cfg(feature = "doctest-readme")]
-mod readme_doctest;
-
 mod sealed {
     pub trait Sealed {}
 }

tracing/src/readme_doctest.rs

@@ -1,2 +0,0 @@
-#![cfg_attr(feature = "doctest-readme", doc(include = "../README.md"))]
-type _DoctestReadme = ();