1 //! Read configurations files.
3 #![deny(missing_docs_in_private_items)]
5 use lazy_static::lazy_static;
6 use std::{env, fmt, fs, io, path};
8 use syntax::{ast, codemap};
12 /// Get the configuration file from arguments.
13 pub fn file_from_args(
14 args: &[codemap::Spanned<ast::NestedMetaItemKind>],
15 ) -> Result<Option<path::PathBuf>, (&'static str, codemap::Span)> {
16 for arg in args.iter().filter_map(|a| a.meta_item()) {
17 if arg.name() == "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) => if let ast::LitKind::Str(ref file, _) = value.node {
23 Ok(Some(file.to_string().into()))
25 Err(("`conf_file` value must be a string", value.span))
34 /// Error from reading a configuration file.
39 /// Not valid toml or doesn't fit the expected conf format
43 /// The name of the key.
45 /// The expected type.
47 /// The type we got instead.
50 /// There is an unknown key is the file.
54 impl fmt::Display for Error {
55 fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
57 Error::Io(ref err) => err.fmt(f),
58 Error::Toml(ref err) => err.fmt(f),
59 Error::Type(key, expected, got) => {
60 write!(f, "`{}` is expected to be a `{}` but is a `{}`", key, expected, got)
62 Error::UnknownKey(ref key) => write!(f, "unknown key `{}`", key),
67 impl From<io::Error> for Error {
68 fn from(e: io::Error) -> Self {
74 static ref ERRORS: Mutex<Vec<Error>> = Mutex::new(Vec::new());
77 macro_rules! define_Conf {
78 ($(#[$doc: meta] ($rust_name: ident, $rust_name_str: expr, $default: expr => $($ty: tt)+),)+) => {
79 pub use self::helpers::Conf;
80 // FIXME(mati865): remove #[allow(rust_2018_idioms)] when it's fixed:
82 // warning: `extern crate` is not idiomatic in the new edition
83 // --> src/utils/conf.rs:82:22
85 // 82 | #[derive(Deserialize)]
86 // | ^^^^^^^^^^^ help: convert it to a `use`
88 #[allow(rust_2018_idioms)]
90 use serde_derive::Deserialize;
91 /// Type used to store lint configuration.
92 #[derive(Deserialize)]
93 #[serde(rename_all="kebab-case", deny_unknown_fields)]
95 $(#[$doc] #[serde(default=$rust_name_str)] #[serde(with=$rust_name_str)]
96 pub $rust_name: define_Conf!(TY $($ty)+),)+
99 third_party: Option<::toml::Value>,
104 use serde::Deserialize;
105 crate fn deserialize<'de, D: serde::Deserializer<'de>>(deserializer: D)
106 -> Result<define_Conf!(TY $($ty)+), D::Error> {
107 type T = define_Conf!(TY $($ty)+);
108 Ok(T::deserialize(deserializer).unwrap_or_else(|e| {
109 crate::utils::conf::ERRORS.lock().expect("no threading here")
110 .push(crate::utils::conf::Error::Toml(e.to_string()));
116 fn $rust_name() -> define_Conf!(TY $($ty)+) {
117 define_Conf!(DEFAULT $($ty)+, $default)
123 // hack to convert tts
124 (TY $ty: ty) => { $ty };
126 // provide a nicer syntax to declare the default value of `Vec<String>` variables
127 (DEFAULT Vec<String>, $e: expr) => { $e.iter().map(|&e| e.to_owned()).collect() };
128 (DEFAULT $ty: ty, $e: expr) => { $e };
132 /// Lint: BLACKLISTED_NAME. The list of blacklisted names to lint about
133 (blacklisted_names, "blacklisted_names", ["foo", "bar", "baz", "quux"] => Vec<String>),
134 /// Lint: CYCLOMATIC_COMPLEXITY. The maximum cyclomatic complexity a function can have
135 (cyclomatic_complexity_threshold, "cyclomatic_complexity_threshold", 25 => u64),
136 /// Lint: DOC_MARKDOWN. The list of words this lint should not consider as identifiers needing ticks
137 (doc_valid_idents, "doc_valid_idents", [
138 "KiB", "MiB", "GiB", "TiB", "PiB", "EiB",
147 "OpenGL", "OpenSSH", "OpenSSL", "OpenStreetMap",
150 "TeX", "LaTeX", "BibTeX", "BibLaTeX",
153 /// Lint: TOO_MANY_ARGUMENTS. The maximum number of argument a function or method can have
154 (too_many_arguments_threshold, "too_many_arguments_threshold", 7 => u64),
155 /// Lint: TYPE_COMPLEXITY. The maximum complexity a type can have
156 (type_complexity_threshold, "type_complexity_threshold", 250 => u64),
157 /// Lint: MANY_SINGLE_CHAR_NAMES. The maximum number of single char bindings a scope may have
158 (single_char_binding_names_threshold, "single_char_binding_names_threshold", 5 => u64),
159 /// Lint: BOXED_LOCAL. The maximum size of objects (in bytes) that will be linted. Larger objects are ok on the heap
160 (too_large_for_stack, "too_large_for_stack", 200 => u64),
161 /// Lint: ENUM_VARIANT_NAMES. The minimum number of enum variants for the lints about variant names to trigger
162 (enum_variant_name_threshold, "enum_variant_name_threshold", 3 => u64),
163 /// Lint: LARGE_ENUM_VARIANT. The maximum size of a emum's variant to avoid box suggestion
164 (enum_variant_size_threshold, "enum_variant_size_threshold", 200 => u64),
165 /// Lint: VERBOSE_BIT_MASK. The maximum allowed size of a bit mask before suggesting to use 'trailing_zeros'
166 (verbose_bit_mask_threshold, "verbose_bit_mask_threshold", 1 => u64),
167 /// Lint: DECIMAL_LITERAL_REPRESENTATION. The lower bound for linting decimal literals
168 (literal_representation_threshold, "literal_representation_threshold", 16384 => u64),
169 /// Lint: TRIVIALLY_COPY_PASS_BY_REF. The maximum size (in bytes) to consider a `Copy` type for passing by value instead of by reference.
170 (trivial_copy_size_limit, "trivial_copy_size_limit", None => Option<u64>),
173 /// Search for the configuration file.
174 pub fn lookup_conf_file() -> io::Result<Option<path::PathBuf>> {
175 /// Possible filename to search for.
176 const CONFIG_FILE_NAMES: [&str; 2] = [".clippy.toml", "clippy.toml"];
178 let mut current = path::PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set"));
181 for config_file_name in &CONFIG_FILE_NAMES {
182 let config_file = current.join(config_file_name);
183 match fs::metadata(&config_file) {
184 // Only return if it's a file to handle the unlikely situation of a directory named
186 Ok(ref md) if md.is_file() => return Ok(Some(config_file)),
187 // Return the error if it's something other than `NotFound`; otherwise we didn't
188 // find the project file yet, and continue searching.
189 Err(e) => if e.kind() != io::ErrorKind::NotFound {
196 // If the current directory has no parent, we're done searching.
203 /// Produces a `Conf` filled with the default values and forwards the errors
205 /// Used internally for convenience
206 fn default(errors: Vec<Error>) -> (Conf, Vec<Error>) {
207 (toml::from_str("").expect("we never error on empty config files"), errors)
210 /// Read the `toml` configuration file.
212 /// In case of error, the function tries to continue as much as possible.
213 pub fn read(path: Option<&path::Path>) -> (Conf, Vec<Error>) {
214 let path = if let Some(path) = path {
217 return default(Vec::new());
220 let file = match fs::File::open(path) {
222 let mut buf = String::new();
224 if let Err(err) = file.read_to_string(&mut buf) {
225 return default(vec![err.into()]);
230 Err(err) => return default(vec![err.into()]),
236 .expect("no threading -> mutex always safe")
239 match toml::from_str(&file) {
244 .expect("no threading -> mutex always safe")
248 let mut errors = ERRORS
250 .expect("no threading -> mutex always safe")
252 errors.push(Error::Toml(e.to_string()));