Add rustfmt config and travis integration.

Author: valentinewallace

.travis.yml

@@ -11,6 +11,9 @@ before_install:
   - sudo apt-get install -y binutils-dev libunwind8-dev libcurl4-openssl-dev libelf-dev libdw-dev cmake gcc binutils-dev libiberty-dev
 
 script:
+     # Check formatting.
+     - if [ "$(rustup show | grep default | grep stable)" != "" ]; then rustup component add rustfmt && cargo fmt --all -- --check; fi
+     - if [ "$(rustup show | grep default | grep 1.34.2)" != "" ]; then rustup component add rustfmt && cd fuzz && cargo fmt --all -- --check && cd ../; fi
      # Build workspaces with Rust stable, beta, and 1.34.0
      - if [ "$(rustup show | grep default | grep 1.22.0)" == "" ]; then RUSTFLAGS="-C link-dead-code" cargo build --verbose; fi
      # Build lightning workspace with Rust 1.22.0

fuzz/rustfmt.toml

@@ -0,0 +1,10 @@
+# Non-default stable features
+hard_tabs = true # use tab characters for indentation, spaces for alignment
+use_field_init_shorthand = true
+max_width = 5000 # Initially set this to a big number to split the diff of the formatter into multiple commits.
+
+# Non-default unstable features
+unstable_features = true
+fn_single_line = true
+match_block_trailing_comma = true
+format_macro_bodies = false

rustfmt.toml

@@ -0,0 +1,10 @@
+# Non-default stable features
+hard_tabs = true # use tab characters for indentation, spaces for alignment
+use_field_init_shorthand = true
+max_width = 5000 # Initially set this to a big number to split the diff of the formatter into multiple commits.
+
+# Non-default unstable features
+unstable_features = true
+fn_single_line = true
+match_block_trailing_comma = true
+format_macro_bodies = false