Setup rustfmt.

Included .rustfmt.toml allows `cargo fmt` to be run on `uom`.
Additionally the Travis CI build includes an additional job to validate
that any changes do not break formatting conventions. Resolves #80.

.rustfmt.toml

@@ -0,0 +1,7 @@
+#comment_width = 100
+#error_on_unformatted = true
+#format_strings = true
+#imports_indent = "Block"
+#match_block_trailing_comma = true
+newline_style = "Native"
+#reorder_imports = true

.travis.yml

@@ -23,11 +23,18 @@ rust:
 matrix:
   allow_failures:
     - rust: nightly
+  include:
+  - env: RUSTFMT
+    rust: 1.26.1
+    install:
+    - rustup component add rustfmt-preview
+    script:
+    - cargo fmt -- --write-mode=diff
 
 before_script: |
   test "${TRAVIS_RUST_VERSION//./_}" != "stable" ||
   (test -x /home/travis/.cargo/bin/cargo-coveralls || cargo install cargo-travis) ||
-  (test $(grep "cargo-travis" /home/travis/.cargo/.crates.toml | sed -r "s/\"cargo-travis ([^\ ]+).+/\1/") = $(cargo search cargo-travis --limit 1 | sed -r "s/cargo-travis \(([^\)]+)\).+/\1/") || cargoo install cargo-travis --force)
+  (test $(grep "cargo-travis" /home/travis/.cargo/.crates.toml | sed -r "s/\"cargo-travis ([^\ ]+).+/\1/") = $(cargo search cargo-travis --limit 1 | sed -r "s/cargo-travis \(([^\)]+)\).+/\1/") || cargo install cargo-travis --force)
 
 script: |
   cargo build --verbose --no-default-features --features "autoconvert usize u8 u16 u32 u64 isize i8 i16 i32 i64 bigint biguint rational rational32 rational64 bigrational f32 f64 si std use_serde" &&

examples/base.rs

@@ -8,7 +8,11 @@ use uom::si::length::{centimeter, meter};
 use uom::si::time::second;
 
 mod cgs {
-    ISQ!(uom::si, f32, (centimeter, gram, second, ampere, kelvin, mole, candela));
+    ISQ!(
+        uom::si,
+        f32,
+        (centimeter, gram, second, ampere, kelvin, mole, candela)
+    );
 }
 
 fn main() {

examples/mks.rs

@@ -82,7 +82,7 @@ system! {
 
 mod f32 {
     mod s {
-        pub use ::*;
+        pub use *;
     }
 
     Q!(f32::s, f32);

examples/si.rs

@@ -2,11 +2,11 @@
 
 extern crate uom;
 
-use uom::si::Unit;
 use uom::si::f32::*;
 use uom::si::length::{centimeter, kilometer, meter};
 use uom::si::time::second;
 use uom::si::velocity::{kilometer_per_second, meter_per_second};
+use uom::si::Unit;
 
 fn main() {
     let l1 = Length::new::<meter>(15.0);

src/lib.rs

@@ -136,7 +136,7 @@
 //!  * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
 //!    <http://www.apache.org/licenses/LICENSE-2.0>)
 //!  * MIT license ([LICENSE-MIT](LICENSE-MIT) or <http://opensource.org/licenses/MIT>)
-//! 
+//!
 //! at your option.
 //!
 //! [BIPM]: http://www.bipm.org/en/about-us/
@@ -146,23 +146,21 @@
 
 // Compile with `no_std` when the `std` feature is not specified.
 #![cfg_attr(not(feature = "std"), no_std)]
-
 // Default rustc lints.
-#![warn(
-    missing_copy_implementations,
-    missing_debug_implementations,
-    missing_docs,
-    trivial_casts,
-    trivial_numeric_casts,
-    unused_extern_crates,
-    unused_import_braces,
-    unused_qualifications,
-    unused_results)]
-
+#![warn(missing_copy_implementations)]
+#![warn(missing_debug_implementations)]
+#![warn(missing_docs)]
+#![warn(trivial_casts)]
+#![warn(trivial_numeric_casts)]
+#![warn(unused_extern_crates)]
+#![warn(unused_import_braces)]
+#![warn(unused_qualifications)]
+#![warn(unused_results)]
 // Clippy lints.
 #![cfg_attr(feature = "cargo-clippy", allow(inline_always))]
 
 // Fail to compile if no underlying storage type features are specified.
+#[cfg_attr(rustfmt, rustfmt_skip)]
 #[cfg(not(any(
     feature = "usize", feature = "u8", feature = "u16", feature = "u32", feature = "u64",
     feature = "isize", feature = "i8", feature = "i16", feature = "i32", feature = "i64",
@@ -266,6 +264,7 @@ pub trait Conversion<V> {
 /// Trait representing a [conversion factor][factor].
 ///
 /// [factor]: https://jcgm.bipm.org/vim/en/1.24.html
+#[cfg_attr(rustfmt, rustfmt_skip)]
 pub trait ConversionFactor<V>
     : lib::ops::Div<Self, Output = Self>
     + lib::ops::Mul<Self, Output = Self>

src/si/prefix.rs

@@ -8,6 +8,7 @@
 /// [si]: http://jcgm.bipm.org/vim/en/1.16.html
 /// [mult]: http://jcgm.bipm.org/vim/en/1.17.html
 /// [submult]: http://jcgm.bipm.org/vim/en/1.18.html
+#[cfg_attr(rustfmt, rustfmt_skip)]
 #[macro_export]
 macro_rules! prefix {
     (yotta) => { 1.0E24 };

src/tests.rs

@@ -1,16 +1,16 @@
 use self::length::{kilometer, meter};
 use self::mass::kilogram;
-#[allow(unused_imports)]
-use {Conversion, ConversionFactor};
+use lib::fmt::Debug;
+use lib::marker::PhantomData;
 #[allow(unused_imports)]
 use num::{Float, FromPrimitive, One, Saturating, Signed, Zero};
 use quickcheck::TestResult;
-use lib::fmt::Debug;
-use lib::marker::PhantomData;
 #[cfg(feature = "serde")]
 use serde_json;
 #[allow(unused_imports)]
 use typenum::{N1, P1, P2, P3, Z0};
+#[allow(unused_imports)]
+use {Conversion, ConversionFactor};
 
 #[macro_use]
 mod length {
@@ -47,6 +47,7 @@ system! {
 }
 
 /// Test trait to allow tests to perform storage-type sensitive comparisons.
+#[cfg_attr(rustfmt, rustfmt_skip)]
 pub trait Test
     : Debug
     + Sized