1 //! Read configurations files.
3 #![deny(clippy::missing_docs_in_private_items)]
5 use lazy_static::lazy_static;
6 use rustc_span::source_map;
7 use std::default::Default;
10 use std::{env, fmt, fs, io, path};
13 /// Gets the configuration file from arguments.
14 pub fn file_from_args(args: &[ast::NestedMetaItem]) -> Result<Option<path::PathBuf>, (&'static str, source_map::Span)> {
15 for arg in args.iter().filter_map(syntax::ast::NestedMetaItem::meta_item) {
16 if arg.check_name(sym!(conf_file)) {
17 return match arg.kind {
18 ast::MetaItemKind::Word | ast::MetaItemKind::List(_) => {
19 Err(("`conf_file` must be a named value", arg.span))
21 ast::MetaItemKind::NameValue(ref value) => {
22 if let ast::LitKind::Str(ref file, _) = value.kind {
23 Ok(Some(file.to_string().into()))
25 Err(("`conf_file` value must be a string", value.span))
35 /// Error from reading a configuration file.
40 /// Not valid toml or doesn't fit the expected conf format
44 impl fmt::Display for Error {
45 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
47 Self::Io(ref err) => err.fmt(f),
48 Self::Toml(ref err) => err.fmt(f),
53 impl From<io::Error> for Error {
54 fn from(e: io::Error) -> Self {
60 static ref ERRORS: Mutex<Vec<Error>> = Mutex::new(Vec::new());
63 macro_rules! define_Conf {
64 ($(#[$doc: meta] ($rust_name: ident, $rust_name_str: expr, $default: expr => $($ty: tt)+),)+) => {
65 pub use self::helpers::Conf;
67 use serde::Deserialize;
68 /// Type used to store lint configuration.
69 #[derive(Deserialize)]
70 #[serde(rename_all="kebab-case", deny_unknown_fields)]
72 $(#[$doc] #[serde(default=$rust_name_str)] #[serde(with=$rust_name_str)]
73 pub $rust_name: define_Conf!(TY $($ty)+),)+
76 third_party: Option<::toml::Value>,
80 use serde::Deserialize;
81 crate fn deserialize<'de, D: serde::Deserializer<'de>>(deserializer: D)
82 -> Result<define_Conf!(TY $($ty)+), D::Error> {
83 type T = define_Conf!(TY $($ty)+);
84 Ok(T::deserialize(deserializer).unwrap_or_else(|e| {
85 crate::utils::conf::ERRORS.lock().expect("no threading here")
86 .push(crate::utils::conf::Error::Toml(e.to_string()));
93 fn $rust_name() -> define_Conf!(TY $($ty)+) {
94 define_Conf!(DEFAULT $($ty)+, $default)
100 // hack to convert tts
101 (TY $ty: ty) => { $ty };
103 // provide a nicer syntax to declare the default value of `Vec<String>` variables
104 (DEFAULT Vec<String>, $e: expr) => { $e.iter().map(|&e| e.to_owned()).collect() };
105 (DEFAULT $ty: ty, $e: expr) => { $e };
109 /// Lint: BLACKLISTED_NAME. The list of blacklisted names to lint about
110 (blacklisted_names, "blacklisted_names", ["foo", "bar", "baz", "quux"] => Vec<String>),
111 /// Lint: COGNITIVE_COMPLEXITY. The maximum cognitive complexity a function can have
112 (cognitive_complexity_threshold, "cognitive_complexity_threshold", 25 => u64),
113 /// DEPRECATED LINT: CYCLOMATIC_COMPLEXITY. Use the Cognitive Complexity lint instead.
114 (cyclomatic_complexity_threshold, "cyclomatic_complexity_threshold", None => Option<u64>),
115 /// Lint: DOC_MARKDOWN. The list of words this lint should not consider as identifiers needing ticks
116 (doc_valid_idents, "doc_valid_idents", [
117 "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
126 "OpenGL", "OpenSSH", "OpenSSL", "OpenStreetMap",
129 "TeX", "LaTeX", "BibTeX", "BibLaTeX",
133 /// Lint: TOO_MANY_ARGUMENTS. The maximum number of argument a function or method can have
134 (too_many_arguments_threshold, "too_many_arguments_threshold", 7 => u64),
135 /// Lint: TYPE_COMPLEXITY. The maximum complexity a type can have
136 (type_complexity_threshold, "type_complexity_threshold", 250 => u64),
137 /// Lint: MANY_SINGLE_CHAR_NAMES. The maximum number of single char bindings a scope may have
138 (single_char_binding_names_threshold, "single_char_binding_names_threshold", 5 => u64),
139 /// Lint: BOXED_LOCAL. The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
140 (too_large_for_stack, "too_large_for_stack", 200 => u64),
141 /// Lint: ENUM_VARIANT_NAMES. The minimum number of enum variants for the lints about variant names to trigger
142 (enum_variant_name_threshold, "enum_variant_name_threshold", 3 => u64),
143 /// Lint: LARGE_ENUM_VARIANT. The maximum size of a enum's variant to avoid box suggestion
144 (enum_variant_size_threshold, "enum_variant_size_threshold", 200 => u64),
145 /// Lint: VERBOSE_BIT_MASK. The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
146 (verbose_bit_mask_threshold, "verbose_bit_mask_threshold", 1 => u64),
147 /// Lint: DECIMAL_LITERAL_REPRESENTATION. The lower bound for linting decimal literals
148 (literal_representation_threshold, "literal_representation_threshold", 16384 => u64),
149 /// Lint: TRIVIALLY_COPY_PASS_BY_REF. The maximum size (in bytes) to consider a `Copy` type for passing by value instead of by reference.
150 (trivial_copy_size_limit, "trivial_copy_size_limit", None => Option<u64>),
151 /// Lint: TOO_MANY_LINES. The maximum number of lines a function or method can have
152 (too_many_lines_threshold, "too_many_lines_threshold", 100 => u64),
153 /// Lint: LARGE_STACK_ARRAYS. The maximum allowed size for arrays on the stack
154 (array_size_threshold, "array_size_threshold", 512_000 => u64),
157 impl Default for Conf {
159 fn default() -> Self {
160 toml::from_str("").expect("we never error on empty config files")
164 /// Search for the configuration file.
165 pub fn lookup_conf_file() -> io::Result<Option<path::PathBuf>> {
166 /// Possible filename to search for.
167 const CONFIG_FILE_NAMES: [&str; 2] = [".clippy.toml", "clippy.toml"];
169 // Start looking for a config file in CLIPPY_CONF_DIR, or failing that, CARGO_MANIFEST_DIR.
170 // If neither of those exist, use ".".
171 let mut current = path::PathBuf::from(
172 env::var("CLIPPY_CONF_DIR")
173 .or_else(|_| env::var("CARGO_MANIFEST_DIR"))
174 .unwrap_or_else(|_| ".".to_string()),
177 for config_file_name in &CONFIG_FILE_NAMES {
178 let config_file = current.join(config_file_name);
179 match fs::metadata(&config_file) {
180 // Only return if it's a file to handle the unlikely situation of a directory named
182 Ok(ref md) if md.is_file() => return Ok(Some(config_file)),
183 // Return the error if it's something other than `NotFound`; otherwise we didn't
184 // find the project file yet, and continue searching.
186 if e.kind() != io::ErrorKind::NotFound {
194 // If the current directory has no parent, we're done searching.
201 /// Produces a `Conf` filled with the default values and forwards the errors
203 /// Used internally for convenience
204 fn default(errors: Vec<Error>) -> (Conf, Vec<Error>) {
205 (Conf::default(), errors)
208 /// Read the `toml` configuration file.
210 /// In case of error, the function tries to continue as much as possible.
211 pub fn read(path: Option<&path::Path>) -> (Conf, Vec<Error>) {
212 let path = if let Some(path) = path {
215 return default(Vec::new());
218 let file = match fs::File::open(path) {
220 let mut buf = String::new();
222 if let Err(err) = file.read_to_string(&mut buf) {
223 return default(vec![err.into()]);
228 Err(err) => return default(vec![err.into()]),
231 assert!(ERRORS.lock().expect("no threading -> mutex always safe").is_empty());
232 match toml::from_str(&file) {
234 let mut errors = ERRORS.lock().expect("no threading -> mutex always safe").split_off(0);
236 let toml_ref: &Conf = &toml;
238 let cyc_field: Option<u64> = toml_ref.cyclomatic_complexity_threshold;
240 if cyc_field.is_some() {
241 let cyc_err = "found deprecated field `cyclomatic-complexity-threshold`. Please use `cognitive-complexity-threshold` instead.".to_string();
242 errors.push(Error::Toml(cyc_err));
248 let mut errors = ERRORS.lock().expect("no threading -> mutex always safe").split_off(0);
249 errors.push(Error::Toml(e.to_string()));