feat(rust): use rustfmt.toml for configuring cargo fmt

Replace fmt.toml with new rustfmt.toml

Signed-off-by: Egor Lazarchuk <yegorlz@amazon.co.uk>

Author: ShadowCurse

rustfmt.toml

@@ -0,0 +1,8 @@
+comment_width = 100
+wrap_comments = true
+format_code_in_doc_comments = true
+format_strings = true
+imports_granularity = "Module"
+normalize_comments = true
+normalize_doc_attributes = true
+group_imports = "StdExternalCrate"

tests/fmt.toml

@@ -18,11 +18,8 @@ def test_rust_order():
 
 def test_rust_style():
     """Test that rust code passes style checks."""
-
-    #  ../src/io_uring/src/bindings.rs
-    config = open("fmt.toml", encoding="utf-8").read().replace("\n", ",")
     # Check that the output is empty.
-    _, stdout, _ = utils.check_output(f"cargo fmt --all -- --check --config {config}")
+    _, stdout, _ = utils.check_output(f"cargo fmt --all -- --check")
 
     # rustfmt prepends `"Diff in"` to the reported output.
     assert "Diff in" not in stdout

tests/integration_tests/style/test_rust.py

@@ -942,7 +942,7 @@ cmd_test_debug() {
 # Example: `devtool fmt`
 #
 cmd_fmt() {
-    cmd_sh "cargo fmt --all -- --config $(tr '\n' ',' <tests/fmt.toml)"
+    cmd_sh "cargo fmt --all"
     cmd_sh "cargo sort"
     cmd_sh "cd tests; black --config pyproject.toml . ../tools ../.buildkite"
     cmd_sh "cd tests; isort . ../tools ../.buildkite"