Prototype of file inclusion and exclusion

Cargo.lock

@@ -3935,10 +3935,13 @@ dependencies = [
  "anyhow",
  "crossbeam",
  "glob",
+ "globset",
+ "ignore",
  "insta",
  "notify",
  "pep440_rs",
  "rayon",
+ "regex-automata 0.4.9",
  "ruff_cache",
  "ruff_db",
  "ruff_macros",

Cargo.toml

@@ -126,6 +126,7 @@ quote = { version = "1.0.23" }
 rand = { version = "0.9.0" }
 rayon = { version = "1.10.0" }
 regex = { version = "1.10.2" }
+regex-automata = { version = "0.4.9" }
 rustc-hash = { version = "2.0.0" }
 rustc-stable-hash = { version = "0.1.2" }
 # When updating salsa, make sure to also update the revision in `fuzz/Cargo.toml`
@@ -165,7 +166,7 @@ tracing-subscriber = { version = "0.3.18", default-features = false, features =
     "env-filter",
     "fmt",
     "ansi",
-    "smallvec"
+    "smallvec",
 ] }
 tryfn = { version = "0.2.1" }
 typed-arena = { version = "2.0.2" }
@@ -175,11 +176,7 @@ unicode-width = { version = "0.2.0" }
 unicode_names2 = { version = "1.2.2" }
 unicode-normalization = { version = "0.1.23" }
 url = { version = "2.5.0" }
-uuid = { version = "1.6.1", features = [
+uuid = { version = "1.6.1", features = ["v4", "fast-rng", "macro-diagnostics"] }
-    "v4",
-    "fast-rng",
-    "macro-diagnostics",
-] }
 walkdir = { version = "2.3.2" }
 wasm-bindgen = { version = "0.2.92" }
 wasm-bindgen-test = { version = "0.3.42" }

crates/ruff_db/src/diagnostic/mod.rs

@@ -652,6 +652,8 @@ pub enum DiagnosticId {
     /// Some I/O operation failed
     Io,
 
+    NoFiles,
+
     /// Some code contains a syntax error
     InvalidSyntax,
 
@@ -699,6 +701,7 @@ impl DiagnosticId {
             DiagnosticId::Lint(name) => name.as_str(),
             DiagnosticId::RevealedType => "revealed-type",
             DiagnosticId::UnknownRule => "unknown-rule",
+            DiagnosticId::NoFiles => "no-files",
         }
     }
 

crates/ruff_db/src/system/path.rs

@@ -534,6 +534,10 @@ impl SystemPathBuf {
         self.0
     }
 
+    pub fn into_string(self) -> String {
+        self.0.into_string()
+    }
+
     pub fn into_std_path_buf(self) -> PathBuf {
         self.0.into_std_path_buf()
     }
@@ -822,7 +826,7 @@ impl ruff_cache::CacheKey for SystemVirtualPathBuf {
 ///
 /// # Examples
 /// ```rust
-/// use ruff_db::system::{SystemPath, deduplicate_nested_paths};///
+/// use ruff_db::system::{SystemPath, deduplicate_nested_paths};
 ///
 /// let paths = vec![SystemPath::new("/a/b/c"), SystemPath::new("/a/b"), SystemPath::new("/a/beta"), SystemPath::new("/a/b/c")];
 /// assert_eq!(deduplicate_nested_paths(paths).collect::<Vec<_>>(), &[SystemPath::new("/a/b"), SystemPath::new("/a/beta")]);

crates/ty/docs/configuration.md

@@ -143,6 +143,23 @@ typeshed = "/path/to/custom/typeshed"
 
 ## `src`
 
+#### `files`
+
+TODO
+
+**Default value**: `null`
+
+**Type**: `list[pattern]`
+
+**Example usage** (`pyproject.toml`):
+
+```toml
+[tool.ty.src]
+files = ["./app", "!app/build"]
+```
+
+---
+
 #### `respect-ignore-files`
 
 Whether to automatically exclude files that are ignored by `.ignore`,

crates/ty/src/lib.rs

@@ -19,7 +19,7 @@ use colored::Colorize;
 use crossbeam::channel as crossbeam_channel;
 use rayon::ThreadPoolBuilder;
 use ruff_db::Upcast;
-use ruff_db::diagnostic::{Diagnostic, DisplayDiagnosticConfig, Severity};
+use ruff_db::diagnostic::{Diagnostic, DiagnosticId, DisplayDiagnosticConfig, Severity};
 use ruff_db::max_parallelism;
 use ruff_db::system::{OsSystem, SystemPath, SystemPathBuf};
 use salsa::plumbing::ZalsaDatabase;
@@ -276,7 +276,7 @@ impl MainLoop {
                 }
 
                 MainLoopMessage::CheckCompleted {
-                    result,
+                    mut result,
                     revision: check_revision,
                 } => {
                     let terminal_settings = db.project().settings(db).terminal();
@@ -286,7 +286,11 @@ impl MainLoop {
 
                     if check_revision == revision {
                         if db.project().files(db).is_empty() {
-                            tracing::warn!("No python files found under the given path(s)");
+                            result.push(Diagnostic::new(
+                                DiagnosticId::NoFiles,
+                                Severity::Warning,
+                                "No python files found under the given path(s)",
+                            ));
                         }
 
                         let mut stdout = stdout().lock();

crates/ty_project/Cargo.toml

@@ -25,7 +25,9 @@ ty_vendored = { workspace = true }
 
 anyhow = { workspace = true }
 crossbeam = { workspace = true }
+ignore = { workspace = true }
 glob = { workspace = true }
+globset = { workspace = true }
 notify = { workspace = true }
 pep440_rs = { workspace = true, features = ["version-ranges"] }
 rayon = { workspace = true }
@@ -35,6 +37,7 @@ schemars = { workspace = true, optional = true }
 serde = { workspace = true }
 thiserror = { workspace = true }
 toml = { workspace = true }
+regex-automata = { workspace = true }
 tracing = { workspace = true }
 
 [dev-dependencies]

crates/ty_project/src/db/changes.rs

@@ -7,7 +7,7 @@ use std::collections::BTreeSet;
 use crate::walk::ProjectFilesWalker;
 use ruff_db::Db as _;
 use ruff_db::files::{File, Files};
-use ruff_db::system::SystemPath;
+use ruff_db::system::{FileType, SystemPath};
 use rustc_hash::FxHashSet;
 use ty_python_semantic::Program;
 
@@ -113,8 +113,16 @@ impl ProjectDatabase {
                     // should be included in the project. We can skip this check for
                     // paths that aren't part of the project or shouldn't be included
                     // when checking the project.
-                    if project.is_path_included(self, &path) {
+                    let metadata = self
-                        if self.system().is_file(&path) {
+                        .system()
+                        .path_metadata(&path)
+                        .map(|metadata| metadata.file_type());
+                    if project.is_path_included(
+                        self,
+                        &path,
+                        matches!(metadata, Ok(FileType::Directory)),
+                    ) {
+                        if matches!(metadata, Ok(FileType::File)) {
                             // Add the parent directory because `walkdir` always visits explicitly passed files
                             // even if they match an exclude filter.
                             added_paths.insert(path.parent().unwrap().to_path_buf());
@@ -153,7 +161,7 @@ impl ProjectDatabase {
                             result.custom_stdlib_changed = true;
                         }
 
-                        if project.is_path_included(self, &path) || path == project_root {
+                        if project.is_path_included(self, &path, true) || path == project_root {
                             // TODO: Shouldn't it be enough to simply traverse the project files and remove all
                             // that start with the given path?
                             tracing::debug!(

crates/ty_project/src/lib.rs

@@ -127,7 +127,7 @@ impl Reporter for DummyReporter {
 #[salsa::tracked]
 impl Project {
     pub fn from_metadata(db: &dyn Db, metadata: ProjectMetadata) -> Self {
-        let (settings, settings_diagnostics) = metadata.options().to_settings(db);
+        let (settings, settings_diagnostics) = metadata.options().to_settings(db, metadata.root());
 
         Project::builder(metadata, settings, settings_diagnostics)
             .durability(Durability::MEDIUM)
@@ -160,8 +160,8 @@ impl Project {
     /// the project's include and exclude settings as well as the paths that were passed to `ty check <paths>`.
     /// This means, that this method is an over-approximation of `Self::files` and may return `true` for paths
     /// that won't be included when checking the project because they're ignored in a `.gitignore` file.
-    pub fn is_path_included(self, db: &dyn Db, path: &SystemPath) -> bool {
+    pub fn is_path_included(self, db: &dyn Db, path: &SystemPath, is_directory: bool) -> bool {
-        ProjectFilesFilter::from_project(db, self).is_included(path)
+        ProjectFilesFilter::from_project(db, self).is_included(path, is_directory)
     }
 
     pub fn reload(self, db: &mut dyn Db, metadata: ProjectMetadata) {
@@ -169,7 +169,8 @@ impl Project {
         assert_eq!(self.root(db), metadata.root());
 
         if &metadata != self.metadata(db) {
-            let (settings, settings_diagnostics) = metadata.options().to_settings(db);
+            let (settings, settings_diagnostics) =
+                metadata.options().to_settings(db, metadata.root());
 
             if self.settings(db) != &settings {
                 self.set_settings(db).to(settings);

crates/ty_project/src/metadata/options.rs

@@ -1,5 +1,9 @@
 use crate::Db;
-use crate::metadata::value::{RangedValue, RelativePathBuf, ValueSource, ValueSourceGuard};
+use crate::metadata::settings::SrcSettings;
+use crate::metadata::value::{
+    RangedValue, RelativePathBuf, RelativePathPattern, ValueSource, ValueSourceGuard,
+};
+use crate::walk::FilePatternsBuilder;
 use ruff_db::diagnostic::{Annotation, Diagnostic, DiagnosticFormat, DiagnosticId, Severity, Span};
 use ruff_db::files::system_path_to_file;
 use ruff_db::system::{System, SystemPath, SystemPathBuf};
@@ -199,10 +203,20 @@ impl Options {
     }
 
     #[must_use]
-    pub(crate) fn to_settings(&self, db: &dyn Db) -> (Settings, Vec<OptionDiagnostic>) {
+    pub(crate) fn to_settings(
+        &self,
+        db: &dyn Db,
+        project_root: &SystemPath,
+    ) -> (Settings, Vec<OptionDiagnostic>) {
         let (rules, diagnostics) = self.to_rule_selection(db);
 
-        let mut settings = Settings::new(rules, self.src.as_ref());
+        let mut settings = Settings::new(rules);
+
+        if let Some(src) = self.src.as_ref() {
+            tracing::debug!("found src options: {src:?}");
+            // TODO: Error handling
+            settings.set_src(src.to_settings(db.system(), project_root).unwrap());
+        }
 
         if let Some(terminal) = self.terminal.as_ref() {
             settings.set_terminal(TerminalSettings {
@@ -408,6 +422,17 @@ pub struct SrcOptions {
     )]
     pub root: Option<RelativePathBuf>,
 
+    /// TODO
+    #[serde(skip_serializing_if = "Option::is_none")]
+    #[option(
+        default = r#"null"#,
+        value_type = "list[pattern]",
+        example = r#"
+            files = ["./app", "!app/build"]
+        "#
+    )]
+    pub files: Option<Vec<RelativePathPattern>>,
+
     /// Whether to automatically exclude files that are ignored by `.ignore`,
     /// `.gitignore`, `.git/info/exclude`, and global `gitignore` files.
     /// Enabled by default.
@@ -422,6 +447,31 @@ pub struct SrcOptions {
     pub respect_ignore_files: Option<bool>,
 }
 
+impl SrcOptions {
+    fn to_settings(
+        &self,
+        system: &dyn System,
+        project_root: &SystemPath,
+        // diagnostics: &mut Vec<OptionDiagnostic>,
+    ) -> Result<SrcSettings, ()> {
+        // TODO: Error handling, default exclusions
+        let mut files = FilePatternsBuilder::new();
+
+        for pattern in self.files.iter().flatten() {
+            files.add(&pattern.absolute(project_root, system)).unwrap();
+        }
+
+        let src = SrcSettings {
+            respect_ignore_files: self.respect_ignore_files.unwrap_or(true),
+            files: files.build().unwrap(),
+        };
+
+        tracing::debug!("Resolved src settings: {src:?}");
+
+        Ok(src)
+    }
+}
+
 #[derive(Debug, Default, Clone, Eq, PartialEq, Combine, Serialize, Deserialize)]
 #[serde(rename_all = "kebab-case", transparent)]
 #[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]

crates/ty_project/src/metadata/settings.rs

@@ -1,9 +1,9 @@
-use std::sync::Arc;
-
-use crate::metadata::options::SrcOptions;
 use ruff_db::diagnostic::DiagnosticFormat;
+use std::sync::Arc;
 use ty_python_semantic::lint::RuleSelection;
 
+use crate::walk::FilePatterns;
+
 /// The resolved [`super::Options`] for the project.
 ///
 /// Unlike [`super::Options`], the struct has default values filled in and
@@ -23,19 +23,15 @@ pub struct Settings {
 
     terminal: TerminalSettings,
 
-    respect_ignore_files: bool,
+    src: SrcSettings,
 }
 
 impl Settings {
-    pub fn new(rules: RuleSelection, src_options: Option<&SrcOptions>) -> Self {
+    pub fn new(rules: RuleSelection) -> Self {
-        let respect_ignore_files = src_options
-            .and_then(|src| src.respect_ignore_files)
-            .unwrap_or(true);
-
         Self {
             rules: Arc::new(rules),
             terminal: TerminalSettings::default(),
-            respect_ignore_files,
+            src: SrcSettings::default(),
         }
     }
 
@@ -43,8 +39,12 @@ impl Settings {
         &self.rules
     }
 
-    pub fn respect_ignore_files(&self) -> bool {
+    pub fn src(&self) -> &SrcSettings {
-        self.respect_ignore_files
+        &self.src
+    }
+
+    pub fn set_src(&mut self, src: SrcSettings) {
+        self.src = src;
     }
 
     pub fn to_rules(&self) -> Arc<RuleSelection> {
@@ -65,3 +65,20 @@ pub struct TerminalSettings {
     pub output_format: DiagnosticFormat,
     pub error_on_warning: bool,
 }
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct SrcSettings {
+    pub respect_ignore_files: bool,
+
+    pub files: FilePatterns,
+}
+
+impl Default for SrcSettings {
+    fn default() -> Self {
+        Self {
+            respect_ignore_files: true,
+            // TODO: This should include all files by default
+            files: FilePatterns::empty(),
+        }
+    }
+}

crates/ty_project/src/metadata/value.rs

@@ -344,3 +344,49 @@ impl RelativePathBuf {
         SystemPath::absolute(&self.0, relative_to)
     }
 }
+
+/// A relative path pattern that allows for negative patterns (git ignore style).
+#[derive(
+    Debug,
+    Clone,
+    serde::Serialize,
+    serde::Deserialize,
+    PartialEq,
+    Eq,
+    PartialOrd,
+    Ord,
+    Hash,
+    Combine,
+)]
+#[serde(transparent)]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
+pub struct RelativePathPattern(RangedValue<String>);
+
+impl RelativePathPattern {
+    pub fn new(pattern: String, source: ValueSource) -> Self {
+        Self(RangedValue::new(pattern, source))
+    }
+
+    pub fn cli(pattern: String) -> Self {
+        Self::new(pattern, ValueSource::Cli)
+    }
+
+    /// Returns the relative pattern.
+    pub fn pattern(&self) -> &str {
+        &self.0
+    }
+
+    /// Resolves the relative pattern to an absolute pattern.
+    pub fn absolute(&self, project_root: &SystemPath, system: &dyn System) -> String {
+        let relative_to = match &self.0.source {
+            ValueSource::File(_) => project_root,
+            ValueSource::Cli => system.current_directory(),
+        };
+
+        if let Some(after) = self.0.strip_prefix('!') {
+            format!("!{}", SystemPath::absolute(after, relative_to))
+        } else {
+            SystemPath::absolute(&self.0, relative_to).into_string()
+        }
+    }
+}

crates/ty_project/src/walk.rs

@@ -1,10 +1,15 @@
 use crate::{Db, IOErrorDiagnostic, IOErrorKind, Project};
+use globset::{Candidate, GlobBuilder, GlobSet, GlobSetBuilder};
+use regex_automata::util::pool::Pool;
 use ruff_db::files::{File, system_path_to_file};
 use ruff_db::system::walk_directory::{ErrorKind, WalkDirectoryBuilder, WalkState};
-use ruff_db::system::{FileType, SystemPath, SystemPathBuf};
+use ruff_db::system::{FileType, SystemPath, SystemPathBuf, deduplicate_nested_paths};
 use ruff_python_ast::PySourceType;
 use rustc_hash::{FxBuildHasher, FxHashSet};
+use std::borrow::Cow;
+use std::collections::BTreeSet;
 use std::path::PathBuf;
+use std::sync::Arc;
 use thiserror::Error;
 
 /// Filter that decides which files are included in the project.
@@ -13,11 +18,15 @@ use thiserror::Error;
 ///
 /// This struct mainly exists because `dyn Db` isn't `Send` or `Sync`, making it impossible
 /// to access fields from within the walker.
-#[derive(Default, Debug)]
+#[derive(Debug)]
 pub(crate) struct ProjectFilesFilter<'a> {
     /// The same as [`Project::included_paths_or_root`].
     included_paths: &'a [SystemPathBuf],
 
+    files_patterns: &'a FilePatterns,
+
+    project_root: &'a SystemPath,
+
     /// The filter skips checking if the path is in `included_paths` if set to `true`.
     ///
     /// Skipping this check is useful when the walker only walks over `included_paths`.
@@ -28,6 +37,8 @@ impl<'a> ProjectFilesFilter<'a> {
     pub(crate) fn from_project(db: &'a dyn Db, project: Project) -> Self {
         Self {
             included_paths: project.included_paths_or_root(db),
+            project_root: project.root(db),
+            files_patterns: &project.settings(db).src().files,
             skip_included_paths: false,
         }
     }
@@ -45,7 +56,7 @@ impl<'a> ProjectFilesFilter<'a> {
     /// This method may return `true` for files that don't end up being included when walking the
     /// project tree because it doesn't consider `.gitignore` and other ignore files when deciding
     /// if a file's included.
-    pub(crate) fn is_included(&self, path: &SystemPath) -> bool {
+    pub(crate) fn is_included(&self, path: &SystemPath, is_directory: bool) -> bool {
         #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
         enum CheckPathMatch {
             /// The path is a partial match of the checked path (it's a sub path)
@@ -78,8 +89,26 @@ impl<'a> ProjectFilesFilter<'a> {
         match m {
             None => false,
             Some(CheckPathMatch::Partial) => {
+                if path == self.project_root {
+                    return true;
+                }
+
+                // TODO: Do we need to use `matched_path_or_any_parents` when not walking?
+
+                let matched = self.files_patterns.matches(path, is_directory);
+                tracing::debug!("path `{path} matches {matched:?}");
                 // TODO: For partial matches, only include the file if it is included by the project's include/exclude settings.
-                true
+                match matched {
+                    // We need to traverse directories that don't match because `a` doesn't match the pattern `a/b/c/d.py`
+                    // but we need to traverse the directory to successfully match `a/b/c/d.py`.
+                    // This is very unfortunate because it means ty traverses all directories when e.g. using `files = ["src"]`.
+                    // TODO(micha): 04.06.2025: It would be nice if we could avoid traversing directories
+                    // that are known can never match because they don't share a common prefix with any of the globs.
+                    // But we'd need to be careful in the precense of `**/test` patterns because they can match any path.
+                    PatternMatch::None => true,
+                    PatternMatch::Exclude(_) => false,
+                    PatternMatch::Include => true,
+                }
             }
             Some(CheckPathMatch::Full) => true,
         }
@@ -132,7 +161,7 @@ impl<'a> ProjectFilesWalker<'a> {
         let mut walker = db
             .system()
             .walk_directory(paths.next()?.as_ref())
-            .standard_filters(db.project().settings(db).respect_ignore_files())
+            .standard_filters(db.project().settings(db).src().respect_ignore_files)
             .ignore_hidden(false);
 
         for path in paths {
@@ -152,7 +181,10 @@ impl<'a> ProjectFilesWalker<'a> {
             Box::new(|entry| {
                 match entry {
                     Ok(entry) => {
-                        if !self.filter.is_included(entry.path()) {
+                        if !self
+                            .filter
+                            .is_included(entry.path(), entry.file_type().is_directory())
+                        {
                             tracing::debug!("Ignoring not-included path: {}", entry.path());
                             return WalkState::Skip;
                         }
@@ -258,3 +290,412 @@ pub(crate) enum WalkError {
     #[error("`{path}` is not a valid UTF-8 path")]
     NonUtf8Path { path: PathBuf },
 }
+
+#[derive(Clone)]
+pub struct FilePatterns {
+    set: GlobSet,
+    patterns: Box<[FilePattern]>,
+    matches: Option<Arc<Pool<Vec<usize>>>>,
+    static_prefixes: Option<BTreeSet<SystemPathBuf>>,
+    num_positive: usize,
+}
+
+impl FilePatterns {
+    pub(crate) fn empty() -> Self {
+        Self {
+            set: GlobSet::empty(),
+            patterns: Box::default(),
+            matches: None,
+            static_prefixes: Some(BTreeSet::new()),
+            num_positive: 0,
+        }
+    }
+
+    pub(crate) fn matches(&self, path: &SystemPath, is_directory: bool) -> PatternMatch {
+        if self.patterns.is_empty() {
+            return PatternMatch::None;
+        }
+
+        let candidate = Candidate::new(path);
+        let mut matches = self.matches.as_ref().unwrap().get();
+        self.set.matches_candidate_into(&candidate, &mut *matches);
+
+        for &i in matches.iter().rev() {
+            let pattern = &self.patterns[i];
+
+            if pattern.is_only_directory && !is_directory {
+                continue;
+            }
+
+            return if pattern.negated {
+                PatternMatch::Exclude(ExcludeReason::Match)
+            } else {
+                PatternMatch::Include
+            };
+        }
+
+        if self.num_positive > 0 {
+            if is_directory {
+                if let Some(static_prefixes) = self.static_prefixes.as_ref() {
+                    // Skip directories for which we know that no glob has a shared prefix with.
+                    // E.g. if `files = ["src"], skip `tests`
+                    if static_prefixes
+                        .range(..=path.to_path_buf())
+                        .next()
+                        .is_none()
+                    {
+                        return PatternMatch::Exclude(ExcludeReason::NoIncludePattern);
+                    }
+                }
+            } else {
+                // If this is a file and there's at least one include pattern but the file doesn't match it,
+                // then the file is excluded. If there are only exclude patterns, than the file should be included.
+                return PatternMatch::Exclude(ExcludeReason::NoIncludePattern);
+            }
+        }
+
+        PatternMatch::None
+    }
+}
+
+impl PartialEq for FilePatterns {
+    fn eq(&self, other: &Self) -> bool {
+        self.patterns == other.patterns
+    }
+}
+
+impl Eq for FilePatterns {}
+
+impl std::fmt::Debug for FilePatterns {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FilePatterns")
+            .field("patterns", &self.patterns)
+            .finish()
+    }
+}
+
+#[derive(Clone, Debug)]
+pub(crate) struct FilePatternsBuilder {
+    set: GlobSetBuilder,
+    patterns: Vec<FilePattern>,
+    static_prefixes: Option<Vec<SystemPathBuf>>,
+    num_positive: usize,
+}
+
+impl FilePatternsBuilder {
+    pub(crate) fn new() -> Self {
+        Self {
+            set: GlobSetBuilder::new(),
+            patterns: Vec::new(),
+            static_prefixes: Some(Vec::new()),
+            num_positive: 0,
+        }
+    }
+
+    pub(crate) fn add(&mut self, input: &str) -> Result<&mut Self, globset::Error> {
+        let mut pattern = FilePattern {
+            negated: false,
+            is_only_directory: false,
+            original: input.to_string(),
+        };
+
+        let mut glob = input;
+
+        if let Some(after) = glob.strip_prefix('!') {
+            pattern.negated = true;
+            glob = after;
+        }
+
+        // A pattern ending with a `/` should only match directories. E.g. `src/` only matches directories
+        // whereas `src` matches both files and directories.
+        // We need to remove the `/` to ensure that a path missing the trailing `/` matches.
+        if let Some(before) = glob.strip_suffix('/') {
+            pattern.is_only_directory = true;
+            glob = before;
+
+            // If the slash was escaped, then remove the escape.
+            // See: https://github.com/BurntSushi/ripgrep/issues/2236
+            let trailing_backslashes = glob.chars().rev().filter(|c| *c == '\\').count();
+            if trailing_backslashes % 2 == 1 {
+                glob = &glob[..glob.len() - trailing_backslashes]
+            }
+        }
+
+        // If the last component contains no wildcards or extension, consider it an implicit glob
+        // This turns `src` into `src/**/*`
+        // TODO: Should we also enable this behavior for `is_only_directory` patterns?
+        if is_implicit_glob(glob) && !pattern.negated {
+            let parsed = GlobBuilder::new(&format!("{glob}/**"))
+                .literal_separator(true)
+                .backslash_escape(true)
+                // TODO: Map the error to the pattern the user provided.
+                .build()?;
+
+            self.set.add(parsed);
+            self.patterns.push(FilePattern {
+                is_only_directory: false,
+                ..pattern.clone()
+            });
+        }
+
+        let mut actual = Cow::Borrowed(glob);
+
+        // If the glob ends with `/**`, then we should only match everything
+        // inside a directory, but not the directory itself. Standard globs
+        // will match the directory. So we add `/*` to force the issue.
+        if actual.ends_with("/**") {
+            actual = Cow::Owned(format!("{}/*", actual));
+        }
+
+        // Unlike gitignore, anchor paths (don't insert a `**` prefix).
+        let parsed = GlobBuilder::new(&*actual)
+            .literal_separator(true)
+            .backslash_escape(true)
+            // TODO: Map the error to the pattern the user provided.
+            .build()?;
+
+        if !pattern.negated {
+            self.num_positive += 1;
+
+            // Do a best effort at extracting a static prefix from a positive include match.
+            // This allows short-circuting traversal of folders that are known to not overlap with any positive
+            // match. However, we have to be careful. Any path starting with a `**` requires visiting all folders.
+            if let Some(static_prefixes) = self.static_prefixes.as_mut() {
+                let mut static_prefix = SystemPathBuf::new();
+                for component in SystemPath::new(glob).components() {
+                    if glob::Pattern::escape(component.as_str()) == component.as_str() {
+                        static_prefix.push(component);
+                    } else {
+                        break;
+                    }
+                }
+
+                if static_prefix.as_str().is_empty() {
+                    // If we see a `**/` pattern, then we have to visit all directories.
+                    self.static_prefixes.take();
+                } else {
+                    static_prefixes.push(static_prefix);
+                }
+            }
+        }
+
+        self.set.add(parsed);
+        self.patterns.push(pattern);
+
+        Ok(self)
+    }
+
+    pub(crate) fn build(self) -> Result<FilePatterns, globset::Error> {
+        let static_prefixes = self
+            .static_prefixes
+            .map(|prefixes| deduplicate_nested_paths(prefixes).collect::<BTreeSet<_>>());
+
+        Ok(FilePatterns {
+            set: self.set.build()?,
+            patterns: self.patterns.into(),
+            matches: Some(Arc::new(Pool::new(|| vec![]))),
+            static_prefixes,
+            num_positive: self.num_positive,
+        })
+    }
+}
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub(crate) enum PatternMatch {
+    /// The highest precedence pattern is an include pattern.
+    Include,
+
+    /// The highest precedence pattern is a negated pattern (the file should not be included).
+    Exclude(ExcludeReason),
+
+    /// No pattern matched the path.
+    None,
+}
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub(crate) enum ExcludeReason {
+    /// The path is excluded because it matches a negative pattern.
+    Match,
+
+    /// It's a file path that doesn't match any include pattern.
+    NoIncludePattern,
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub(crate) struct FilePattern {
+    /// The pattern as specified by the user.
+    original: String,
+
+    /// Whether the glob should only match directories (`src/` matches only directories).
+    is_only_directory: bool,
+
+    /// Whether this pattern was negated.
+    negated: bool,
+}
+
+fn is_implicit_glob(pattern: &str) -> bool {
+    let as_path = SystemPath::new(pattern);
+
+    as_path
+        .components()
+        .last()
+        .is_some_and(|last| !last.as_str().contains(['.', '*', '?']))
+}
+
+#[cfg(test)]
+mod tests {
+    use ruff_db::system::SystemPath;
+
+    use crate::walk::{ExcludeReason, FilePatterns, FilePatternsBuilder, PatternMatch};
+
+    fn create_patterns(patterns: impl IntoIterator<Item = &'static str>) -> FilePatterns {
+        let mut builder = FilePatternsBuilder::new();
+
+        for pattern in patterns {
+            builder.add(pattern).unwrap_or_else(|err| {
+                panic!("Invalid pattern '{pattern}`: {err}");
+            });
+        }
+
+        builder.build().unwrap()
+    }
+
+    #[test]
+    fn all() {
+        let patterns = create_patterns(["**"]);
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src"), true),
+            PatternMatch::Include
+        );
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/"), true),
+            PatternMatch::Include
+        );
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("/"), true),
+            PatternMatch::Include
+        );
+        assert_eq!(
+            patterns.matches(SystemPath::new("/test.py"), true),
+            PatternMatch::Include
+        );
+    }
+
+    #[test]
+    fn implicit_directory_pattern() {
+        // Patterns ending with a slash only match directories with the given name, but not files.
+        // It includes all files in said directory
+        let patterns = create_patterns(["/src/"]);
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src"), true),
+            PatternMatch::Include
+        );
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/"), true),
+            PatternMatch::Include
+        );
+
+        // Don't include files, because the pattern ends with `/`
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src"), false),
+            PatternMatch::Exclude(ExcludeReason::NoIncludePattern)
+        );
+
+        // But include the content of src
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/test.py"), false),
+            PatternMatch::Include
+        );
+
+        // Deep nesting
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/glob/builder.py"), false),
+            PatternMatch::Include
+        );
+
+        // Or a file with the same name
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/src"), false),
+            PatternMatch::Include
+        );
+
+        // Or a directory with the same name
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/src"), true),
+            PatternMatch::Include
+        );
+    }
+
+    #[test]
+    fn implicit_pattern() {
+        // Patterns ending without a slash include both files and directories.
+        // It includes all files in said directory
+        let patterns = create_patterns(["/src"]);
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src"), true),
+            PatternMatch::Include
+        );
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/"), true),
+            PatternMatch::Include
+        );
+
+        // Also include files
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src"), false),
+            PatternMatch::Include
+        );
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/test.py"), false),
+            PatternMatch::Include
+        );
+
+        // Deep nesting
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/glob/builder.py"), false),
+            PatternMatch::Include
+        );
+
+        // Or a file with the same name
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/src"), false),
+            PatternMatch::Include
+        );
+
+        // Or a directory with the same name
+        assert_eq!(
+            patterns.matches(SystemPath::new("/src/src"), true),
+            PatternMatch::Include
+        );
+    }
+
+    #[test]
+    fn pattern_with_extension() {
+        // Patterns with an extension only match files or directories with the exact name.
+        let patterns = create_patterns(["test.py"]);
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("test.py"), true),
+            PatternMatch::Include
+        );
+        assert_eq!(
+            patterns.matches(SystemPath::new("test.py"), false),
+            PatternMatch::Include
+        );
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("test.py/abcd"), false),
+            PatternMatch::Exclude(ExcludeReason::NoIncludePattern)
+        );
+
+        assert_eq!(
+            patterns.matches(SystemPath::new("test.py/abcd"), true),
+            PatternMatch::None
+        );
+    }
+}

ty.schema.json

@@ -851,6 +851,16 @@
     "SrcOptions": {
       "type": "object",
       "properties": {
+        "files": {
+          "description": "TODO",
+          "type": [
+            "array",
+            "null"
+          ],
+          "items": {
+            "type": "string"
+          }
+        },
         "respect-ignore-files": {
           "description": "Whether to automatically exclude files that are ignored by `.ignore`, `.gitignore`, `.git/info/exclude`, and global `gitignore` files. Enabled by default.",
           "type": [