Install rustfmt

.rustfmt.toml

@@ -0,0 +1,10 @@
+chain_one_line_max = 100
+single_line_if_else_max_width = 100
+array_width = 100
+fn_call_width = 100
+reorder_import_names = true
+reorder_imports_in_group = true
+trailing_comma = "Never"
+trailing_semicolon = true
+fn_args_density = "CompressedIfEmpty"
+imports_indent = "Visual"

.travis.yml

@@ -2,7 +2,13 @@ language: rust
 rust:
   - stable
 cache: cargo
+
+before_script:
+  - export PATH="$PATH:$HOME/.cargo/bin"
+  - which rustfmt || cargo install rustfmt
+
 script:
+  - cargo fmt -- --write-mode=diff
   - cargo build
   - cargo build --release
   - cargo test