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