Make preview part of the selector API

crates/flake8_to_ruff/src/plugin.rs

@@ -4,6 +4,7 @@ use std::str::FromStr;
 
 use anyhow::anyhow;
 use ruff::registry::Linter;
+use ruff::settings::types::PreviewMode;
 use ruff::RuleSelector;
 
 #[derive(Copy, Clone, Ord, PartialOrd, Eq, PartialEq)]
@@ -331,7 +332,7 @@ pub(crate) fn infer_plugins_from_codes(selectors: &HashSet<RuleSelector>) -> Vec
     .filter(|plugin| {
         for selector in selectors {
             if selector
-                .into_iter()
+                .rules(PreviewMode::Disabled)
                 .any(|rule| Linter::from(plugin).rules().any(|r| r == rule))
             {
                 return true;

crates/ruff/src/rule_selector.rs

@@ -9,6 +9,7 @@ use crate::codes::RuleCodePrefix;
 use crate::codes::RuleIter;
 use crate::registry::{Linter, Rule, RuleNamespace};
 use crate::rule_redirects::get_redirect;
+use crate::settings::types::PreviewMode;
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum RuleSelector {
@@ -168,11 +169,9 @@ impl Visitor<'_> for SelectorVisitor {
     }
 }
 
-impl IntoIterator for &RuleSelector {
-    type Item = Rule;
-    type IntoIter = RuleSelectorIter;
-
-    fn into_iter(self) -> Self::IntoIter {
+impl RuleSelector {
+    /// Return all matching rules, regardless of whether they're in preview.
+    pub fn all_rules(&self) -> impl Iterator<Item = Rule> + '_ {
         match self {
             RuleSelector::All => RuleSelectorIter::All(Rule::iter()),
             RuleSelector::Preview => {
@@ -194,6 +193,13 @@ impl IntoIterator for &RuleSelector {
             }
         }
     }
+
+    /// Returns rules matching the selector, taking into account whether preview mode is enabled.
+    pub fn rules(&self, preview: PreviewMode) -> impl Iterator<Item = Rule> + '_ {
+        self.all_rules().filter(move |rule| {
+            matches!(self, RuleSelector::Rule { .. }) || preview.is_enabled() || !rule.is_preview()
+        })
+    }
 }
 
 pub enum RuleSelectorIter {

crates/ruff/src/settings/defaults.rs

@@ -70,7 +70,10 @@ pub static INCLUDE: Lazy<Vec<FilePattern>> = Lazy::new(|| {
 impl Default for Settings {
     fn default() -> Self {
         Self {
-            rules: PREFIXES.iter().flat_map(IntoIterator::into_iter).collect(),
+            rules: PREFIXES
+                .iter()
+                .flat_map(|selector| selector.rules(PreviewMode::default()))
+                .collect(),
             allowed_confusables: FxHashSet::from_iter([]),
             builtins: vec![],
             dummy_variable_rgx: DUMMY_VARIABLE_RGX.clone(),

crates/ruff/src/settings/types.rs

@@ -194,7 +194,7 @@ pub struct PerFileIgnore {
 
 impl PerFileIgnore {
     pub fn new(pattern: String, prefixes: &[RuleSelector], project_root: Option<&Path>) -> Self {
-        let rules: RuleSet = prefixes.iter().flat_map(IntoIterator::into_iter).collect();
+        let rules: RuleSet = prefixes.iter().flat_map(RuleSelector::all_rules).collect();
         let path = Path::new(&pattern);
         let absolute = match project_root {
             Some(project_root) => fs::normalize_path_to(path, project_root),

crates/ruff_workspace/src/configuration.rs

@@ -440,11 +440,17 @@ impl Configuration {
     }
 
     pub fn as_rule_table(&self) -> RuleTable {
+        let preview = self.preview.unwrap_or_default();
+
         // The select_set keeps track of which rules have been selected.
-        let mut select_set: RuleSet = defaults::PREFIXES.iter().flatten().collect();
+        let mut select_set: RuleSet = defaults::PREFIXES
+            .iter()
+            .map(|selector| selector.rules(preview))
+            .flatten()
+            .collect();
 
         // The fixable set keeps track of which rules are fixable.
-        let mut fixable_set: RuleSet = RuleSelector::All.into_iter().collect();
+        let mut fixable_set: RuleSet = RuleSelector::All.rules(preview).collect();
 
         // Ignores normally only subtract from the current set of selected
         // rules.  By that logic the ignore in `select = [], ignore = ["E501"]`
@@ -472,9 +478,6 @@ impl Configuration {
             let carriedover_unfixables = carryover_unfixables.take();
 
             for spec in Specificity::iter() {
-                let include_preview_rules =
-                    self.preview.is_some_and(|preview| preview.is_enabled());
-
                 // Iterate over rule selectors in order of specificity.
                 for selector in selection
                     .select
@@ -483,13 +486,7 @@ impl Configuration {
                     .chain(selection.extend_select.iter())
                     .filter(|s| s.specificity() == spec)
                 {
-                    for rule in selector {
-                        if !matches!(spec, Specificity::Rule)
-                            && !include_preview_rules
-                            && rule.is_preview()
-                        {
-                            continue;
-                        }
+                    for rule in selector.rules(preview) {
                         select_map_updates.insert(rule, true);
                     }
                 }
@@ -499,7 +496,7 @@ impl Configuration {
                     .chain(carriedover_ignores.into_iter().flatten())
                     .filter(|s| s.specificity() == spec)
                 {
-                    for rule in selector {
+                    for rule in selector.rules(preview) {
                         select_map_updates.insert(rule, false);
                     }
                 }
@@ -511,7 +508,7 @@ impl Configuration {
                     .chain(selection.extend_fixable.iter())
                     .filter(|s| s.specificity() == spec)
                 {
-                    for rule in selector {
+                    for rule in selector.rules(preview) {
                         fixable_map_updates.insert(rule, true);
                     }
                 }
@@ -521,7 +518,7 @@ impl Configuration {
                     .chain(carriedover_unfixables.into_iter().flatten())
                     .filter(|s| s.specificity() == spec)
                 {
-                    for rule in selector {
+                    for rule in selector.rules(preview) {
                         fixable_map_updates.insert(rule, false);
                     }
                 }