Merge pull request #180 from mgeisler/simplify-ci

Simplify CI, drop Rust 1.31 compatibility

.appveyor.yml

@@ -3,21 +3,13 @@ environment:
   - TOOLCHAIN: stable
   - TOOLCHAIN: nightly
 
-matrix:
-  allow_failures:
-    - TOOLCHAIN: nightly
-
 install:
   - ps: Start-FileDownload 'https://static.rust-lang.org/rustup/dist/i686-pc-windows-gnu/rustup-init.exe'
-  - rustup-init.exe -y --default-toolchain %TOOLCHAIN%
+  - rustup-init.exe -y --profile minimal --default-toolchain %TOOLCHAIN%
   - set PATH=%PATH%;%USERPROFILE%\.cargo\bin
 
 build_script:
-  - cargo build --verbose --all-features
+  - cargo build --all-features
 
 test_script:
-  - cargo test --verbose --all-features
-
-cache:
-  - '%USERPROFILE%\.cargo'
-  - target
+  - cargo test --all-features

.travis.yml

@@ -3,11 +3,10 @@ language: rust
 rust:
   - stable
   - nightly
-  - 1.31.0  # Rust 2018
 
-cache: cargo
+install:
+  - cargo build --all-features
 
 script:
-  - cargo build --verbose --all-features
-  - cargo test --verbose --all-features
+  - cargo test --all-features
   - if [[ $TRAVIS_RUST_VERSION == "nightly" ]]; then cargo build --benches; fi

Cargo.toml

@@ -36,4 +36,3 @@ lipsum = "0.6"
 rand = "0.6"
 rand_xorshift = "0.1"
 version-sync = "0.8"
-yaml-rust = "0.4"

README.md

@@ -5,7 +5,6 @@
 [![](https://codecov.io/gh/mgeisler/textwrap/branch/master/graph/badge.svg)][codecov]
 [![](https://img.shields.io/crates/v/textwrap.svg)][crates-io]
 [![](https://docs.rs/textwrap/badge.svg)][api-docs]
-[![](https://img.shields.io/badge/rustc-1.31.0-4d76ae.svg)][rust-1.31]
 
 Textwrap is a small Rust crate for word wrapping text. You can use it
 to format strings for display in commandline applications. The crate
@@ -185,8 +184,16 @@ This section lists the largest changes per release.
 
 ### Unreleased ###
 
-We now require the [Rust 2018 edition][rust-1.31]. This will be a
-stable baseline going forward.
+We now require the [Rust 2018 edition][rust-2018]. Over the years,
+we’ve repeatedly seen build failures in our CI, even when nothing
+changed in `textwrap`. The failures happened because we tested against
+a fixed version of Rust, but our dependencies kept releasing new patch
+it has versions that would push up the minimum required Rust version.
+
+The build failures makes it infeasible to keep `textwrap` compatible
+with any particular version of Rust. We will therefore track the
+latest stable version of Rust from now on.
+
 
 ### Version 0.11.0 — December 9th, 2018
 
@@ -321,7 +328,7 @@ Contributions will be accepted under the same license.
 [py-textwrap]: https://docs.python.org/library/textwrap
 [patterns]: https://github.com/tapeinosyne/hyphenation/tree/master/patterns-tex
 [api-docs]: https://docs.rs/textwrap/
-[rust-1.31]: https://github.com/rust-lang/rust/blob/master/RELEASES.md#version-1310-2018-12-06
+[rust-2018]: https://doc.rust-lang.org/edition-guide/rust-2018/
 [issue-13]: https://github.com/mgeisler/textwrap/issues/13
 [issue-14]: https://github.com/mgeisler/textwrap/issues/14
 [issue-19]: https://github.com/mgeisler/textwrap/issues/19

tests/version-numbers.rs

@@ -1,7 +1,3 @@
-use std::fs::File;
-use std::io::Read;
-use yaml_rust::YamlLoader;
-
 #[test]
 fn test_readme_deps() {
     version_sync::assert_markdown_deps_updated!("README.md");
@@ -15,33 +11,6 @@ fn test_readme_changelog() {
     );
 }
 
-#[test]
-fn test_readme_rustc_min_version() {
-    let mut file = File::open(".travis.yml").expect("Could not open");
-    let mut buf = String::new();
-    file.read_to_string(&mut buf).expect("Could not read");
-
-    let yaml = YamlLoader::load_from_str(&buf).expect("Could not parse");
-    assert_eq!(yaml.len(), 1, "Expected a single YAML document");
-
-    let rust_versions = &yaml[0]["rust"]
-        .as_vec()
-        .expect("Could not find vector with Rust versions");
-
-    let min_rust_version = rust_versions
-        .iter()
-        .filter_map(|version| match version.as_str() {
-            Some("stable") | Some("beta") | Some("nightly") => None,
-            version => version,
-        })
-        .last()
-        .expect("No minimum Rust version found");
-
-    let pattern = "https://img.shields.io/badge/rustc-{version}-4d76ae.svg";
-    version_sync::check_contains_regex("README.md", pattern, "", min_rust_version)
-        .expect("Minimum Rust version not found");
-}
-
 #[test]
 fn test_html_root_url() {
     version_sync::assert_html_root_url_updated!("src/lib.rs");