Clippy lint configuration curated for those getting started with serious projects in Rust. Just drop it at the end of your Cargo.toml!

clippy-greatest-hits.toml

[lints.clippy]
#################################### Warns #####################################
#--- suspicious, complexity, perf & style groups are warn-by-default
#--- set entire pedantic group to warn (pedantic is intended for opt-outs)
pedantic = { level = "warn", priority = -1 } # feel free to #[allow] specific lints in code
nursery = { level = "warn", priority = -1 }
#--- set selective lints from restriction group to warn (restriction is intended for opt-ins)
# restriction = { level = "warn", priority = -1 }
absolute_paths = "warn" # clippy.toml: `absolute-paths-max-segments = 2`
allow_attributes = "warn"
allow_attributes_without_reason = "warn"
clone_on_ref_ptr = "warn"
create_dir = "warn"
empty_enum_variants_with_brackets = "warn"
empty_structs_with_brackets = "warn"
error_impl_error = "warn"
filetype_is_file = "warn"
fn_to_numeric_cast_any = "warn"
format_push_string = "warn"
if_then_some_else_none = "warn"
impl_trait_in_params = "warn"
infinite_loop = "warn"
integer_division = "warn" # feel free to #[allow] where required
let_underscore_untyped = "warn"
lossy_float_literal = "warn"
map_err_ignore = "warn"
map_with_unused_argument_over_ranges = "warn"
min_ident_chars = "warn" # clippy config: `min-ident-chars-threshold = 1`
mem_forget = "warn"
missing_assert_message = "warn"
missing_asserts_for_indexing = "warn"
mixed_read_write_in_expression = "warn"
module_name_repetitions = "warn"
multiple_inherent_impl = "warn"
multiple_unsafe_ops_per_block = "warn" # combines with undocumented_unsafe_blocks to ensure each unsafe usage is documented
mutex_atomic = "warn"
non_zero_suggestions = "warn"
panic_in_result_fn = "warn"
partial_pub_fields = "warn"
pathbuf_init_then_push = "warn"
pub_without_shorthand = "warn" # choosing pub_with_shorthand as it's more concise
rc_buffer = "warn"
rc_mutex = "warn"
renamed_function_params = "warn" # clippy config: `allow-renamed-params-for = [ "..", "mycrate::myTrait" ]`
rest_pat_in_fully_bound_structs = "warn"
same_name_method = "warn"
self_named_module_files = "warn" # choosing mod_module_files as it keeps related rs files in same dir
semicolon_outside_block = "warn"
shadow_unrelated = "warn"
string_to_string = "warn"
tests_outside_test_module = "warn"
try_err = "warn"
undocumented_unsafe_blocks = "warn"
unnecessary_safety_comment = "warn"
unnecessary_safety_doc = "warn"
unnecessary_self_imports = "warn"
unneeded_field_pattern = "warn"
unseparated_literal_suffix = "warn" # choosing separated_literal_suffix for better readability
unused_result_ok = "warn"
unused_trait_names = "warn"
unwrap_in_result = "warn" # feel free to #[allow] for specific functions
unwrap_used = "warn"
# use_debug = "warn" # keeping disabled by default, can be enabled when required
verbose_file_reads = "warn"
wildcard_enum_match_arm = "warn" # feel free to #[allow] for specific blocks

#################################### Allows ####################################
#--- set selective lints from pedantic group to allow
map_unwrap_or = "allow" # This reduces readability; see https://github.com/rust-lang/rust-clippy/issues/10428