Add rustfmt to CI to unify code formatting

.github/workflows/rust.yml

@@ -24,6 +24,9 @@ jobs:
           toolchain: ${{ matrix.rust }}
           components: clippy
           cache: true
+      - if: matrix.rust == 'stable'
+        run: cargo fmt -- --check
+
       # test project with default + extra features
       - if: matrix.rust == 'stable' || matrix.rust == 'beta'
         run: cargo test --features image,ndarray,sop-class,rle,cli,jpegxl

.rustfmt.toml

@@ -0,0 +1,2 @@
+newline_style = "Unix"
+max_width = 100

.rustfmt_nightly.toml

@@ -0,0 +1,6 @@
+newline_style = "Unix"
+max_width = 100
+
+# Enable only with nightly channel via - cargo +nightly fmt
+imports_granularity = "Crate"
+group_imports = "StdExternalCrate"

justfile

@@ -0,0 +1,11 @@
+check:
+    cargo fmt -- --check
+    cargo clippy
+
+fix:
+    cargo fmt
+    cargo clippy --fix --allow-dirty --allow-staged
+
+fix_nightly:
+    cargo +nightly fmt -- --config-path .rustfmt_nightly.toml
+    #cargo +nightly clippy --fix --allow-dirty --allow-staged # To enable, after running format on nightly