Add rustfmt.toml to standardize formatting

Signed-off-by: Jorge Prendes <jorge.prendes@gmail.com>

.github/workflows/basic.yml

@@ -44,7 +44,9 @@ jobs:
       - name: Setup Rust toolchain and cache
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
-          components: rustfmt, clippy
+          components: clippy
+      - name: Install nightly rustfmt
+        run: rustup toolchain install nightly --component rustfmt --profile minimal --no-self-update
       - name: typos-action
         uses: crate-ci/typos@v1.14.12
       - name: Install just

rustfmt.toml

@@ -0,0 +1,6 @@
+newline_style = "Native"
+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"

scripts/cargo.sh

@@ -48,6 +48,9 @@ if [ "$1" == "fmt" ]; then
     # running cargo fmt fails when run through cross
     # also cargo fmt is platform independent
     CARGO="cargo"
+
+    # Use nightly for `cargo fmt` as `rustfmt.toml` uses unstable features.
+    set -- "+nightly" "$@"
 fi
 
 if [ "$CARGO" == "cross" ]; then