add newline_style and unstable_features to rustfmt.toml

Signed-off-by: jiaxiao zhou <[email protected]>

.github/workflows/ci.yml

@@ -14,13 +14,15 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - uses: actions/checkout@v3
-      - uses: Swatinem/rust-cache@v2
-      - uses: dtolnay/rust-toolchain@nightly
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           components: rustfmt, clippy
       - name: Setup build env
         run: ./scripts/setup.sh
         shell: bash
+      - run: 
+          # needed to run rustfmt in nightly toolchain
+          rustup toolchain install nightly --component rustfmt
       - name: Run checks
         run: make check
   build:

crates/wasi-demo-app/src/main.rs

@@ -20,7 +20,11 @@ fn main() {
             file.write_all(args[3..].join(" ").as_bytes()).unwrap();
         }
         "daemon" => loop {
-            println!("This is a song that never ends.\nYes, it goes on and on my friends.\nSome people started singing it not knowing what it was,\nSo they'll continue singing it forever just because...\n");
+            println!(
+                "This is a song that never ends.\nYes, it goes on and on my friends.\nSome people \
+                 started singing it not knowing what it was,\nSo they'll continue singing it \
+                 forever just because...\n"
+            );
             sleep(Duration::from_secs(1));
         },
         _ => {

rustfmt.toml

@@ -1,5 +1,6 @@
-# create three groups for std, external and local crates
-group_imports = "StdExternalCrate"
-
-# https://rust-lang.github.io/rustfmt/?version=v1.4.38&search=#imports_granularity
+newline_style = "Unix"
+unstable_features = true # Cargo fmt now needs to be called with `cargo +nightly fmt`
+group_imports = "StdExternalCrate" # create three groups for std, external and local crates
+# Merge imports from the same module
+# See: https://rust-lang.github.io/rustfmt/?version=v1.4.38&search=#imports_granularity
 imports_granularity = "Module"