Warn the user if an explicitly selected check code is ignored (#356)

src/cli.rs

@@ -0,0 +1,136 @@
+use std::fmt;
+use std::path::PathBuf;
+
+use clap::{command, Parser};
+use log::warn;
+use regex::Regex;
+
+use crate::checks::CheckCode;
+use crate::printer::SerializationFormat;
+use crate::pyproject::StrCheckCodePair;
+use crate::settings::PythonVersion;
+use crate::RawSettings;
+
+#[derive(Debug, Parser)]
+#[command(author, about = "ruff: An extremely fast Python linter.")]
+#[command(version)]
+pub struct Cli {
+    #[arg(required = true)]
+    pub files: Vec<PathBuf>,
+    /// Enable verbose logging.
+    #[arg(short, long)]
+    pub verbose: bool,
+    /// Disable all logging (but still exit with status code "1" upon detecting errors).
+    #[arg(short, long)]
+    pub quiet: bool,
+    /// Exit with status code "0", even upon detecting errors.
+    #[arg(short, long)]
+    pub exit_zero: bool,
+    /// Run in watch mode by re-running whenever files change.
+    #[arg(short, long)]
+    pub watch: bool,
+    /// Attempt to automatically fix lint errors.
+    #[arg(short, long)]
+    pub fix: bool,
+    /// Disable cache reads.
+    #[arg(short, long)]
+    pub no_cache: bool,
+    /// List of error codes to enable.
+    #[arg(long, value_delimiter = ',')]
+    pub select: Vec<CheckCode>,
+    /// Like --select, but adds additional error codes on top of the selected ones.
+    #[arg(long, value_delimiter = ',')]
+    pub extend_select: Vec<CheckCode>,
+    /// List of error codes to ignore.
+    #[arg(long, value_delimiter = ',')]
+    pub ignore: Vec<CheckCode>,
+    /// Like --ignore, but adds additional error codes on top of the ignored ones.
+    #[arg(long, value_delimiter = ',')]
+    pub extend_ignore: Vec<CheckCode>,
+    /// List of paths, used to exclude files and/or directories from checks.
+    #[arg(long, value_delimiter = ',')]
+    pub exclude: Vec<String>,
+    /// Like --exclude, but adds additional files and directories on top of the excluded ones.
+    #[arg(long, value_delimiter = ',')]
+    pub extend_exclude: Vec<String>,
+    /// List of mappings from file pattern to code to exclude
+    #[arg(long, value_delimiter = ',')]
+    pub per_file_ignores: Vec<StrCheckCodePair>,
+    /// Output serialization format for error messages.
+    #[arg(long, value_enum, default_value_t=SerializationFormat::Text)]
+    pub format: SerializationFormat,
+    /// See the files ruff will be run against with the current settings.
+    #[arg(long)]
+    pub show_files: bool,
+    /// See ruff's settings.
+    #[arg(long)]
+    pub show_settings: bool,
+    /// Enable automatic additions of noqa directives to failing lines.
+    #[arg(long)]
+    pub add_noqa: bool,
+    /// Regular expression matching the name of dummy variables.
+    #[arg(long)]
+    pub dummy_variable_rgx: Option<Regex>,
+    /// The minimum Python version that should be supported.
+    #[arg(long)]
+    pub target_version: Option<PythonVersion>,
+    /// Round-trip auto-formatting.
+    // TODO(charlie): This should be a sub-command.
+    #[arg(long, hide = true)]
+    pub autoformat: bool,
+}
+
+pub enum Warnable {
+    Select,
+    ExtendSelect,
+}
+
+impl fmt::Display for Warnable {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Warnable::Select => fmt.write_str("--select"),
+            Warnable::ExtendSelect => fmt.write_str("--extend-select"),
+        }
+    }
+}
+
+/// Warn the user if they attempt to enable a code that won't be respected.
+pub fn warn_on(
+    flag: Warnable,
+    codes: &Vec<CheckCode>,
+    cli_ignore: &Vec<CheckCode>,
+    cli_extend_ignore: &Vec<CheckCode>,
+    pyproject_settings: &RawSettings,
+    pyproject_path: &Option<PathBuf>,
+) {
+    for code in codes {
+        if !cli_ignore.is_empty() {
+            if cli_ignore.contains(code) {
+                warn!("{code:?} was passed to {flag}, but ignored via --ignore")
+            }
+        } else if pyproject_settings.ignore.contains(code) {
+            if let Some(path) = pyproject_path {
+                warn!(
+                    "{code:?} was passed to {flag}, but ignored by the `ignore` field in {}",
+                    path.to_string_lossy()
+                )
+            } else {
+                warn!("{code:?} was passed to {flag}, but ignored by the default `ignore` field",)
+            }
+        }
+        if !cli_extend_ignore.is_empty() {
+            if cli_extend_ignore.contains(code) {
+                warn!("{code:?} was passed to {flag}, but ignored via --extend-ignore")
+            }
+        } else if pyproject_settings.extend_ignore.contains(code) {
+            if let Some(path) = pyproject_path {
+                warn!(
+                    "{code:?} was passed to {flag}, but ignored by the `extend_ignore` field in {}",
+                    path.to_string_lossy()
+                )
+            } else {
+                warn!("{code:?} was passed to {flag}, but ignored by the default `extend_ignore` field")
+            }
+        }
+    }
+}

src/lib.rs

@@ -15,6 +15,7 @@ pub mod cache;
 pub mod check_ast;
 mod check_lines;
 pub mod checks;
+pub mod cli;
 pub mod code_gen;
 pub mod fs;
 pub mod linter;
@@ -41,7 +42,7 @@ pub fn check(path: &Path, contents: &str) -> Result<Vec<Message>> {
         None => debug!("Unable to find pyproject.toml; using default settings..."),
     };
 
-    let settings = Settings::from_raw(RawSettings::from_pyproject(pyproject, project_root)?);
+    let settings = Settings::from_raw(RawSettings::from_pyproject(&pyproject, &project_root)?);
 
     // Tokenize once.
     let tokens: Vec<LexResult> = tokenize(contents);

src/main.rs

@@ -5,17 +5,17 @@ use std::sync::mpsc::channel;
 use std::time::Instant;
 
 use anyhow::Result;
-use clap::{command, Parser};
+use clap::Parser;
 use colored::Colorize;
 use log::{debug, error};
 use notify::{raw_watcher, RecursiveMode, Watcher};
 use rayon::prelude::*;
-use regex::Regex;
 use walkdir::DirEntry;
 
 use ruff::cache;
 use ruff::checks::CheckCode;
 use ruff::checks::CheckKind;
+use ruff::cli::{warn_on, Cli, Warnable};
 use ruff::fs::iter_python_files;
 use ruff::linter::add_noqa_to_path;
 use ruff::linter::autoformat_path;
@@ -23,84 +23,15 @@ use ruff::linter::lint_path;
 use ruff::logging::set_up_logging;
 use ruff::message::Message;
 use ruff::printer::{Printer, SerializationFormat};
-use ruff::pyproject::{self, StrCheckCodePair};
+use ruff::pyproject::{self};
+use ruff::settings::CurrentSettings;
 use ruff::settings::RawSettings;
-use ruff::settings::{CurrentSettings, PythonVersion};
 use ruff::settings::{FilePattern, PerFileIgnore, Settings};
 use ruff::tell_user;
 
 const CARGO_PKG_NAME: &str = env!("CARGO_PKG_NAME");
 const CARGO_PKG_VERSION: &str = env!("CARGO_PKG_VERSION");
 
-#[derive(Debug, Parser)]
-#[command(author, about = "ruff: An extremely fast Python linter.")]
-#[command(version)]
-struct Cli {
-    #[arg(required = true)]
-    files: Vec<PathBuf>,
-    /// Enable verbose logging.
-    #[arg(short, long)]
-    verbose: bool,
-    /// Disable all logging (but still exit with status code "1" upon detecting errors).
-    #[arg(short, long)]
-    quiet: bool,
-    /// Exit with status code "0", even upon detecting errors.
-    #[arg(short, long)]
-    exit_zero: bool,
-    /// Run in watch mode by re-running whenever files change.
-    #[arg(short, long)]
-    watch: bool,
-    /// Attempt to automatically fix lint errors.
-    #[arg(short, long)]
-    fix: bool,
-    /// Disable cache reads.
-    #[arg(short, long)]
-    no_cache: bool,
-    /// List of error codes to enable.
-    #[arg(long, value_delimiter = ',')]
-    select: Vec<CheckCode>,
-    /// Like --select, but adds additional error codes on top of the selected ones.
-    #[arg(long, value_delimiter = ',')]
-    extend_select: Vec<CheckCode>,
-    /// List of error codes to ignore.
-    #[arg(long, value_delimiter = ',')]
-    ignore: Vec<CheckCode>,
-    /// Like --ignore, but adds additional error codes on top of the ignored ones.
-    #[arg(long, value_delimiter = ',')]
-    extend_ignore: Vec<CheckCode>,
-    /// List of paths, used to exclude files and/or directories from checks.
-    #[arg(long, value_delimiter = ',')]
-    exclude: Vec<String>,
-    /// Like --exclude, but adds additional files and directories on top of the excluded ones.
-    #[arg(long, value_delimiter = ',')]
-    extend_exclude: Vec<String>,
-    /// List of mappings from file pattern to code to exclude
-    #[arg(long, value_delimiter = ',')]
-    per_file_ignores: Vec<StrCheckCodePair>,
-    /// Output serialization format for error messages.
-    #[arg(long, value_enum, default_value_t=SerializationFormat::Text)]
-    format: SerializationFormat,
-    /// See the files ruff will be run against with the current settings.
-    #[arg(long)]
-    show_files: bool,
-    /// See ruff's settings.
-    #[arg(long)]
-    show_settings: bool,
-    /// Enable automatic additions of noqa directives to failing lines.
-    #[arg(long)]
-    add_noqa: bool,
-    /// Regular expression matching the name of dummy variables.
-    #[arg(long)]
-    dummy_variable_rgx: Option<Regex>,
-    /// The minimum Python version that should be supported.
-    #[arg(long)]
-    target_version: Option<PythonVersion>,
-    /// Round-trip auto-formatting.
-    // TODO(charlie): This should be a sub-command.
-    #[arg(long, hide = true)]
-    autoformat: bool,
-}
-
 #[cfg(feature = "update-informer")]
 fn check_for_updates() {
     use update_informer::{registry, Check};
@@ -125,8 +56,11 @@ fn check_for_updates() {
     }
 }
 
-fn show_settings(settings: RawSettings) {
+fn show_settings(settings: RawSettings, project_root: Option<PathBuf>, pyproject: Option<PathBuf>) {
-    println!("{:#?}", CurrentSettings::from_settings(settings));
+    println!(
+        "{:#?}",
+        CurrentSettings::from_settings(settings, project_root, pyproject)
+    );
 }
 
 fn show_files(files: &[PathBuf], settings: &Settings) {
@@ -292,7 +226,7 @@ fn inner_main() -> Result<ExitCode> {
         .map(|pair| PerFileIgnore::new(pair, &project_root))
         .collect();
 
-    let mut settings = RawSettings::from_pyproject(pyproject, project_root)?;
+    let mut settings = RawSettings::from_pyproject(&pyproject, &project_root)?;
     if !exclude.is_empty() {
         settings.exclude = exclude;
     }
@@ -303,9 +237,25 @@ fn inner_main() -> Result<ExitCode> {
         settings.per_file_ignores = per_file_ignores;
     }
     if !cli.select.is_empty() {
+        warn_on(
+            Warnable::Select,
+            &cli.select,
+            &cli.ignore,
+            &cli.extend_ignore,
+            &settings,
+            &pyproject,
+        );
         settings.select = cli.select;
     }
     if !cli.extend_select.is_empty() {
+        warn_on(
+            Warnable::ExtendSelect,
+            &cli.extend_select,
+            &cli.ignore,
+            &cli.extend_ignore,
+            &settings,
+            &pyproject,
+        );
         settings.extend_select = cli.extend_select;
     }
     if !cli.ignore.is_empty() {
@@ -326,7 +276,7 @@ fn inner_main() -> Result<ExitCode> {
         return Ok(ExitCode::FAILURE);
     }
     if cli.show_settings {
-        show_settings(settings);
+        show_settings(settings, project_root, pyproject);
         return Ok(ExitCode::SUCCESS);
     }
 

src/settings.rs

@@ -1,4 +1,3 @@
-use serde::{Deserialize, Serialize};
 use std::collections::BTreeSet;
 use std::hash::{Hash, Hasher};
 use std::path::{Path, PathBuf};
@@ -8,6 +7,7 @@ use anyhow::{anyhow, Result};
 use glob::Pattern;
 use once_cell::sync::Lazy;
 use regex::Regex;
+use serde::{Deserialize, Serialize};
 
 use crate::checks::{CheckCode, DEFAULT_CHECK_CODES};
 use crate::fs;
@@ -94,8 +94,6 @@ pub struct RawSettings {
     pub ignore: Vec<CheckCode>,
     pub line_length: usize,
     pub per_file_ignores: Vec<PerFileIgnore>,
-    pub project_root: Option<PathBuf>,
-    pub pyproject: Option<PathBuf>,
     pub select: Vec<CheckCode>,
     pub target_version: PythonVersion,
 }
@@ -129,10 +127,10 @@ static DEFAULT_DUMMY_VARIABLE_RGX: Lazy<Regex> =
 
 impl RawSettings {
     pub fn from_pyproject(
-        pyproject: Option<PathBuf>,
+        pyproject: &Option<PathBuf>,
-        project_root: Option<PathBuf>,
+        project_root: &Option<PathBuf>,
     ) -> Result<Self> {
-        let config = load_config(&pyproject)?;
+        let config = load_config(pyproject)?;
         Ok(RawSettings {
             dummy_variable_rgx: match config.dummy_variable_rgx {
                 Some(pattern) => Regex::new(&pattern)
@@ -145,14 +143,14 @@ impl RawSettings {
                 .map(|paths| {
                     paths
                         .iter()
-                        .map(|path| FilePattern::from_user(path, &project_root))
+                        .map(|path| FilePattern::from_user(path, project_root))
                         .collect()
                 })
                 .unwrap_or_else(|| DEFAULT_EXCLUDE.clone()),
             extend_exclude: config
                 .extend_exclude
                 .iter()
-                .map(|path| FilePattern::from_user(path, &project_root))
+                .map(|path| FilePattern::from_user(path, project_root))
                 .collect(),
             extend_ignore: config.extend_ignore,
             select: config
@@ -164,10 +162,8 @@ impl RawSettings {
             per_file_ignores: config
                 .per_file_ignores
                 .into_iter()
-                .map(|pair| PerFileIgnore::new(pair, &project_root))
+                .map(|pair| PerFileIgnore::new(pair, project_root))
                 .collect(),
-            project_root,
-            pyproject,
         })
     }
 }
@@ -278,14 +274,18 @@ pub struct CurrentSettings {
     pub ignore: Vec<CheckCode>,
     pub line_length: usize,
     pub per_file_ignores: Vec<PerFileIgnore>,
-    pub project_root: Option<PathBuf>,
-    pub pyproject: Option<PathBuf>,
     pub select: Vec<CheckCode>,
     pub target_version: PythonVersion,
+    pub project_root: Option<PathBuf>,
+    pub pyproject: Option<PathBuf>,
 }
 
 impl CurrentSettings {
-    pub fn from_settings(settings: RawSettings) -> Self {
+    pub fn from_settings(
+        settings: RawSettings,
+        project_root: Option<PathBuf>,
+        pyproject: Option<PathBuf>,
+    ) -> Self {
         Self {
             dummy_variable_rgx: settings.dummy_variable_rgx,
             exclude: settings
@@ -303,10 +303,10 @@ impl CurrentSettings {
             ignore: settings.ignore,
             line_length: settings.line_length,
             per_file_ignores: settings.per_file_ignores,
-            project_root: settings.project_root,
-            pyproject: settings.pyproject,
             select: settings.select,
             target_version: settings.target_version,
+            project_root,
+            pyproject,
         }
     }
 }