Add support for default-groups (#8471)

## Summary

This PR adds support for `tool.uv.default-groups`, which defaults to
`["dev"]` for backwards-compatibility. These represent the groups we
sync by default.

Author: charliermarsh

crates/uv-configuration/src/dev.rs

@@ -15,19 +15,16 @@ pub enum DevMode {
 }
 
 impl DevMode {
-    /// Iterate over the group names to include.
-    pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
-        match self {
-            Self::Exclude => Either::Left(std::iter::empty()),
-            Self::Include | Self::Only => Either::Right(std::iter::once(&*DEV_DEPENDENCIES)),
-        }
-    }
-
     /// Returns `true` if the specification allows for production dependencies.
     pub fn prod(&self) -> bool {
         matches!(self, Self::Exclude | Self::Include)
     }
 
+    /// Returns `true` if the specification only includes development dependencies.
+    pub fn only(&self) -> bool {
+        matches!(self, Self::Only)
+    }
+
     /// Returns the flag that was used to request development dependencies.
     pub fn as_flag(&self) -> &'static str {
         match self {
@@ -36,9 +33,26 @@ impl DevMode {
             Self::Only => "--only-dev",
         }
     }
+
+    /// Iterate over the group names to include.
+    pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
+        <&Self as IntoIterator>::into_iter(self)
+    }
+}
+
+impl<'a> IntoIterator for &'a DevMode {
+    type Item = &'a GroupName;
+    type IntoIter = Either<std::iter::Empty<&'a GroupName>, std::iter::Once<&'a GroupName>>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        match self {
+            DevMode::Exclude => Either::Left(std::iter::empty()),
+            DevMode::Include | DevMode::Only => Either::Right(std::iter::once(&*DEV_DEPENDENCIES)),
+        }
+    }
 }
 
-#[derive(Debug, Clone)]
+#[derive(Default, Debug, Clone)]
 pub struct DevGroupsSpecification {
     /// Legacy option for `dependency-group.dev` and `tool.uv.dev-dependencies`.
     ///
@@ -48,37 +62,31 @@ pub struct DevGroupsSpecification {
     /// The groups to include.
     ///
     /// Requested via the `--group` and `--only-group` options.
-    groups: GroupsSpecification,
+    groups: Option<GroupsSpecification>,
 }
 
 #[derive(Debug, Clone)]
 pub enum GroupsSpecification {
     /// Include dependencies from the specified groups.
     Include(Vec<GroupName>),
-    /// Do not include dependencies from groups.
-    Exclude,
     /// Only include dependencies from the specified groups, exclude all other dependencies.
     Only(Vec<GroupName>),
 }
 
 impl GroupsSpecification {
-    /// Returns an [`Iterator`] over the group names to include.
-    pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
-        match self {
-            Self::Exclude => Either::Left(std::iter::empty()),
-            Self::Include(groups) | Self::Only(groups) => Either::Right(groups.iter()),
-        }
-    }
-
     /// Returns `true` if the specification allows for production dependencies.
     pub fn prod(&self) -> bool {
-        matches!(self, Self::Exclude | Self::Include(_))
+        matches!(self, Self::Include(_))
+    }
+
+    /// Returns `true` if the specification is limited to a select set of groups.
+    pub fn only(&self) -> bool {
+        matches!(self, Self::Only(_))
     }
 
     /// Returns the option that was used to request the groups, if any.
     pub fn as_flag(&self) -> Option<Cow<'_, str>> {
         match self {
-            Self::Exclude => None,
             Self::Include(groups) => match groups.as_slice() {
                 [] => None,
                 [group] => Some(Cow::Owned(format!("--group {group}"))),
@@ -91,17 +99,27 @@ impl GroupsSpecification {
             },
         }
     }
-}
 
-impl DevGroupsSpecification {
-    /// Returns an [`Iterator`] over the group names to include.
+    /// Iterate over the group names to include.
     pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
-        match self.dev {
-            None => Either::Left(self.groups.iter()),
-            Some(ref dev_mode) => Either::Right(self.groups.iter().chain(dev_mode.iter())),
+        <&Self as IntoIterator>::into_iter(self)
+    }
+}
+
+impl<'a> IntoIterator for &'a GroupsSpecification {
+    type Item = &'a GroupName;
+    type IntoIter = std::slice::Iter<'a, GroupName>;
+
+    fn into_iter(self) -> Self::IntoIter {
+        match self {
+            GroupsSpecification::Include(groups) | GroupsSpecification::Only(groups) => {
+                groups.iter()
+            }
         }
     }
+}
 
+impl DevGroupsSpecification {
     /// Determine the [`DevGroupsSpecification`] policy from the command-line arguments.
     pub fn from_args(
         dev: bool,
@@ -110,7 +128,7 @@ impl DevGroupsSpecification {
         group: Vec<GroupName>,
         only_group: Vec<GroupName>,
     ) -> Self {
-        let dev_mode = if only_dev {
+        let dev = if only_dev {
             Some(DevMode::Only)
         } else if no_dev {
             Some(DevMode::Exclude)
@@ -121,70 +139,141 @@ impl DevGroupsSpecification {
         };
 
         let groups = if !group.is_empty() {
-            if matches!(dev_mode, Some(DevMode::Only)) {
+            if matches!(dev, Some(DevMode::Only)) {
                 unreachable!("cannot specify both `--only-dev` and `--group`")
             };
-            GroupsSpecification::Include(group)
+            Some(GroupsSpecification::Include(group))
         } else if !only_group.is_empty() {
-            if matches!(dev_mode, Some(DevMode::Include)) {
+            if matches!(dev, Some(DevMode::Include)) {
                 unreachable!("cannot specify both `--dev` and `--only-group`")
             };
-            GroupsSpecification::Only(only_group)
+            Some(GroupsSpecification::Only(only_group))
         } else {
-            GroupsSpecification::Exclude
+            None
         };
 
-        Self {
-            dev: dev_mode,
-            groups,
-        }
+        Self { dev, groups }
     }
 
     /// Return a new [`DevGroupsSpecification`] with development dependencies included by default.
     ///
     /// This is appropriate in projects, where the `dev` group is synced by default.
     #[must_use]
-    pub fn with_default_dev(self) -> Self {
-        match self.dev {
-            Some(_) => self,
-            None => match self.groups {
-                // Only include the default `dev` group if `--only-group` wasn't used
-                GroupsSpecification::Only(_) => self,
-                GroupsSpecification::Exclude | GroupsSpecification::Include(_) => Self {
-                    dev: Some(DevMode::Include),
-                    ..self
-                },
-            },
+    pub fn with_defaults(self, defaults: Vec<GroupName>) -> DevGroupsManifest {
+        DevGroupsManifest {
+            spec: self,
+            defaults,
         }
     }
 
     /// Returns `true` if the specification allows for production dependencies.
     pub fn prod(&self) -> bool {
-        (self.dev.is_none() || self.dev.as_ref().is_some_and(DevMode::prod)) && self.groups.prod()
+        self.dev.as_ref().map_or(true, DevMode::prod)
+            && self.groups.as_ref().map_or(true, GroupsSpecification::prod)
     }
 
-    /// Returns the flag that was used to request development dependencies.
+    /// Returns `true` if the specification is limited to a select set of groups.
+    pub fn only(&self) -> bool {
+        self.dev.as_ref().is_some_and(DevMode::only)
+            || self.groups.as_ref().is_some_and(GroupsSpecification::only)
+    }
+
+    /// Returns the flag that was used to request development dependencies, if specified.
     pub fn dev_mode(&self) -> Option<&DevMode> {
         self.dev.as_ref()
     }
 
-    /// Returns the list of groups to include.
-    pub fn groups(&self) -> &GroupsSpecification {
-        &self.groups
+    /// Returns the list of groups to include, if specified.
+    pub fn groups(&self) -> Option<&GroupsSpecification> {
+        self.groups.as_ref()
+    }
+
+    /// Returns an [`Iterator`] over the group names to include.
+    pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
+        <&Self as IntoIterator>::into_iter(self)
+    }
+}
+
+impl<'a> IntoIterator for &'a DevGroupsSpecification {
+    type Item = &'a GroupName;
+    type IntoIter = std::iter::Chain<
+        std::iter::Flatten<std::option::IntoIter<&'a DevMode>>,
+        std::iter::Flatten<std::option::IntoIter<&'a GroupsSpecification>>,
+    >;
+
+    fn into_iter(self) -> Self::IntoIter {
+        self.dev
+            .as_ref()
+            .into_iter()
+            .flatten()
+            .chain(self.groups.as_ref().into_iter().flatten())
     }
 }
 
 impl From<DevMode> for DevGroupsSpecification {
     fn from(dev: DevMode) -> Self {
         Self {
             dev: Some(dev),
-            groups: GroupsSpecification::Exclude,
+            groups: None,
         }
     }
 }
 
 impl From<GroupsSpecification> for DevGroupsSpecification {
     fn from(groups: GroupsSpecification) -> Self {
-        Self { dev: None, groups }
+        Self {
+            dev: None,
+            groups: Some(groups),
+        }
+    }
+}
+
+/// The manifest of `dependency-groups` to include, taking into account the user-provided
+/// [`DevGroupsSpecification`] and the project-specific default groups.
+#[derive(Debug, Clone)]
+pub struct DevGroupsManifest {
+    /// The specification for the development dependencies.
+    pub(crate) spec: DevGroupsSpecification,
+    /// The default groups to include.
+    pub(crate) defaults: Vec<GroupName>,
+}
+
+impl DevGroupsManifest {
+    /// Returns a new [`DevGroupsManifest`] with the given default groups.
+    pub fn from_defaults(defaults: Vec<GroupName>) -> Self {
+        Self {
+            spec: DevGroupsSpecification::default(),
+            defaults,
+        }
+    }
+
+    /// Returns a new [`DevGroupsManifest`] with the given specification.
+    pub fn from_spec(spec: DevGroupsSpecification) -> Self {
+        Self {
+            spec,
+            defaults: Vec::new(),
+        }
+    }
+
+    /// Returns `true` if the specification allows for production dependencies.
+    pub fn prod(&self) -> bool {
+        self.spec.prod()
+    }
+
+    /// Returns an [`Iterator`] over the group names to include.
+    pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
+        if self.spec.only() {
+            Either::Left(self.spec.iter())
+        } else {
+            Either::Right(
+                self.spec
+                    .iter()
+                    .chain(self.defaults.iter().filter(|default| {
+                        // If `--no-dev` was provided, exclude the `dev` group from the list of defaults.
+                        !matches!(self.spec.dev_mode(), Some(DevMode::Exclude))
+                            || *default != &*DEV_DEPENDENCIES
+                    })),
+            )
+        }
     }
 }

crates/uv-resolver/src/lock/mod.rs

@@ -15,7 +15,7 @@ use toml_edit::{value, Array, ArrayOfTables, InlineTable, Item, Table, Value};
 use url::Url;
 
 use uv_cache_key::RepositoryUrl;
-use uv_configuration::{BuildOptions, DevGroupsSpecification, ExtrasSpecification, InstallOptions};
+use uv_configuration::{BuildOptions, DevGroupsManifest, ExtrasSpecification, InstallOptions};
 use uv_distribution::DistributionDatabase;
 use uv_distribution_filename::{DistExtension, ExtensionError, SourceDistExtension, WheelFilename};
 use uv_distribution_types::{
@@ -575,7 +575,7 @@ impl Lock {
         marker_env: &ResolverMarkerEnvironment,
         tags: &Tags,
         extras: &ExtrasSpecification,
-        dev: &DevGroupsSpecification,
+        dev: &DevGroupsManifest,
         build_options: &BuildOptions,
         install_options: &InstallOptions,
     ) -> Result<Resolution, LockError> {

crates/uv-resolver/src/lock/requirements_txt.rs

@@ -10,7 +10,7 @@ use petgraph::{Directed, Graph};
 use rustc_hash::{FxBuildHasher, FxHashMap, FxHashSet};
 use url::Url;
 
-use uv_configuration::{DevGroupsSpecification, EditableMode, ExtrasSpecification, InstallOptions};
+use uv_configuration::{DevGroupsManifest, EditableMode, ExtrasSpecification, InstallOptions};
 use uv_distribution_filename::{DistExtension, SourceDistExtension};
 use uv_fs::Simplified;
 use uv_git::GitReference;
@@ -43,7 +43,7 @@ impl<'lock> RequirementsTxtExport<'lock> {
         lock: &'lock Lock,
         root_name: &PackageName,
         extras: &ExtrasSpecification,
-        dev: &DevGroupsSpecification,
+        dev: &DevGroupsManifest,
         editable: EditableMode,
         hashes: bool,
         install_options: &'lock InstallOptions,

crates/uv-resolver/src/lock/tree.rs

@@ -4,7 +4,7 @@ use std::collections::BTreeSet;
 use itertools::Itertools;
 use rustc_hash::{FxHashMap, FxHashSet};
 
-use uv_configuration::DevGroupsSpecification;
+use uv_configuration::DevGroupsManifest;
 use uv_normalize::{ExtraName, GroupName, PackageName};
 use uv_pypi_types::ResolverMarkerEnvironment;
 
@@ -26,7 +26,7 @@ pub struct TreeDisplay<'env> {
     /// Maximum display depth of the dependency tree.
     depth: usize,
     /// Whether to include development dependencies in the display.
-    dev: DevGroupsSpecification,
+    dev: DevGroupsManifest,
     /// Prune the given packages from the display of the dependency tree.
     prune: Vec<PackageName>,
     /// Display only the specified packages.
@@ -43,7 +43,7 @@ impl<'env> TreeDisplay<'env> {
         depth: usize,
         prune: Vec<PackageName>,
         packages: Vec<PackageName>,
-        dev: DevGroupsSpecification,
+        dev: DevGroupsManifest,
         no_dedupe: bool,
         invert: bool,
     ) -> Self {