Refactor development dependency configuration (#8309)

Part of #8090 
Unblocks #8274

Refactors `DevMode` and `DevSpecification` into a shared type
`DevGroupsSpecification` that allows us to track if `--dev` was
implicitly or explicitly provided.

crates/uv-configuration/src/dev.rs

@@ -13,31 +13,44 @@ pub enum DevMode {
 }
 
 impl DevMode {
-    /// Determine the [`DevMode`] policy from the command-line arguments.
-    pub fn from_args(dev: bool, no_dev: bool, only_dev: bool) -> Self {
-        if only_dev {
-            Self::Only
-        } else if no_dev {
-            Self::Exclude
-        } else if dev {
-            Self::Include
-        } else {
-            Self::default()
+    /// 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)
+    }
 }
 
 #[derive(Debug, Clone)]
-pub enum DevSpecification {
-    /// Include dev dependencies from the specified group.
+pub struct DevGroupsSpecification {
+    /// Legacy option for `dependency-group.dev` and `tool.uv.dev-dependencies`.
+    ///
+    /// Requested via the `--dev`, `--no-dev`, and `--only-dev` flags.
+    dev: Option<DevMode>,
+
+    /// The groups to include.
+    ///
+    /// Requested via the `--group` and `--only-group` options.
+    groups: GroupsSpecification,
+}
+
+#[derive(Debug, Clone)]
+pub enum GroupsSpecification {
+    /// Include dependencies from the specified groups.
     Include(Vec<GroupName>),
-    /// Do not include dev dependencies.
+    /// Do not include dependencies from groups.
     Exclude,
-    /// Include dev dependencies from the specified groups, and exclude all non-dev dependencies.
+    /// Only include dependencies from the specified groups, exclude all other dependencies.
     Only(Vec<GroupName>),
 }
 
-impl DevSpecification {
+impl GroupsSpecification {
     /// Returns an [`Iterator`] over the group names to include.
     pub fn iter(&self) -> impl Iterator<Item = &GroupName> {
         match self {
@@ -52,48 +65,92 @@ impl DevSpecification {
     }
 }
 
-impl From<DevMode> for DevSpecification {
-    fn from(mode: DevMode) -> Self {
-        match mode {
-            DevMode::Include => Self::Include(vec![DEV_DEPENDENCIES.clone()]),
-            DevMode::Exclude => Self::Exclude,
-            DevMode::Only => Self::Only(vec![DEV_DEPENDENCIES.clone()]),
+impl DevGroupsSpecification {
+    /// Returns an [`Iterator`] 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())),
         }
     }
-}
 
-impl DevSpecification {
-    /// Determine the [`DevSpecification`] policy from the command-line arguments.
+    /// Determine the [`DevGroupsSpecification`] policy from the command-line arguments.
     pub fn from_args(
         dev: bool,
         no_dev: bool,
         only_dev: bool,
         group: Vec<GroupName>,
         only_group: Vec<GroupName>,
     ) -> Self {
-        let from_mode = DevSpecification::from(DevMode::from_args(dev, no_dev, only_dev));
-        if !group.is_empty() {
-            match from_mode {
-                DevSpecification::Exclude => Self::Include(group),
-                DevSpecification::Include(dev) => {
-                    Self::Include(group.into_iter().chain(dev).collect())
-                }
-                DevSpecification::Only(_) => {
-                    unreachable!("cannot specify both `--only-dev` and `--group`")
-                }
-            }
+        let dev_mode = if only_dev {
+            Some(DevMode::Only)
+        } else if no_dev {
+            Some(DevMode::Exclude)
+        } else if dev {
+            Some(DevMode::Include)
+        } else {
+            None
+        };
+
+        let groups = if !group.is_empty() {
+            if matches!(dev_mode, Some(DevMode::Only)) {
+                unreachable!("cannot specify both `--only-dev` and `--group`")
+            };
+            GroupsSpecification::Include(group)
         } else if !only_group.is_empty() {
-            match from_mode {
-                DevSpecification::Exclude => Self::Only(only_group),
-                DevSpecification::Only(dev) => {
-                    Self::Only(only_group.into_iter().chain(dev).collect())
-                }
-                // TODO(zanieb): `dev` defaults to true we can't tell if `--dev` was provided in
-                // conflict with `--only-group` here
-                DevSpecification::Include(_) => Self::Only(only_group),
-            }
+            if matches!(dev_mode, Some(DevMode::Include)) {
+                unreachable!("cannot specify both `--dev` and `--only-group`")
+            };
+            GroupsSpecification::Only(only_group)
         } else {
-            from_mode
+            GroupsSpecification::Exclude
+        };
+
+        Self {
+            dev: dev_mode,
+            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
+                },
+            },
         }
     }
+
+    /// 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()
+    }
+
+    pub fn dev_mode(&self) -> Option<&DevMode> {
+        self.dev.as_ref()
+    }
+}
+
+impl From<DevMode> for DevGroupsSpecification {
+    fn from(dev: DevMode) -> Self {
+        Self {
+            dev: Some(dev),
+            groups: GroupsSpecification::Exclude,
+        }
+    }
+}
+
+impl From<GroupsSpecification> for DevGroupsSpecification {
+    fn from(groups: GroupsSpecification) -> Self {
+        Self { dev: None, groups }
+    }
 }

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, DevSpecification, ExtrasSpecification, InstallOptions};
+use uv_configuration::{BuildOptions, DevGroupsSpecification, 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: &DevSpecification,
+        dev: &DevGroupsSpecification,
         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::{DevSpecification, EditableMode, ExtrasSpecification, InstallOptions};
+use uv_configuration::{DevGroupsSpecification, 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: &DevSpecification,
+        dev: &DevGroupsSpecification,
         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::DevMode;
+use uv_configuration::DevGroupsSpecification;
 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: DevMode,
+    dev: DevGroupsSpecification,
     /// 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: DevMode,
+        dev: DevGroupsSpecification,
         no_dedupe: bool,
         invert: bool,
     ) -> Self {
@@ -236,14 +236,14 @@ impl<'env> TreeDisplay<'env> {
         let dependencies: Vec<Node<'env>> = self
             .dependencies
             .get(node.package_id())
-            .filter(|_| self.dev != DevMode::Only)
+            .filter(|_| self.dev.prod())
             .into_iter()
             .flatten()
             .map(|dep| Node::Dependency(dep.as_ref()))
             .chain(
                 self.optional_dependencies
                     .get(node.package_id())
-                    .filter(|_| self.dev != DevMode::Only)
+                    .filter(|_| self.dev.prod())
                     .into_iter()
                     .flatten()
                     .flat_map(|(extra, deps)| {
@@ -254,9 +254,9 @@ impl<'env> TreeDisplay<'env> {
             .chain(
                 self.dev_dependencies
                     .get(node.package_id())
-                    .filter(|_| self.dev != DevMode::Exclude)
                     .into_iter()
                     .flatten()
+                    .filter(|(group, _)| self.dev.iter().contains(*group))
                     .flat_map(|(group, deps)| {
                         deps.iter().map(move |dep| Node::DevDependency(group, dep))
                     }),

crates/uv/src/commands/project/add.rs

@@ -13,8 +13,8 @@ use uv_cache::Cache;
 use uv_cache_key::RepositoryUrl;
 use uv_client::{BaseClientBuilder, Connectivity, FlatIndexClient, RegistryClientBuilder};
 use uv_configuration::{
-    Concurrency, Constraints, DevMode, DevSpecification, EditableMode, ExtrasSpecification,
-    InstallOptions, LowerBound, SourceStrategy,
+    Concurrency, Constraints, DevGroupsSpecification, DevMode, EditableMode, ExtrasSpecification,
+    GroupsSpecification, InstallOptions, LowerBound, SourceStrategy,
 };
 use uv_dispatch::BuildDispatch;
 use uv_distribution::DistributionDatabase;
@@ -807,22 +807,25 @@ async fn lock_and_sync(
     let (extras, dev) = match dependency_type {
         DependencyType::Production => {
             let extras = ExtrasSpecification::None;
-            let dev = DevSpecification::from(DevMode::Exclude);
+            let dev = DevGroupsSpecification::from(DevMode::Exclude);
             (extras, dev)
         }
         DependencyType::Dev => {
             let extras = ExtrasSpecification::None;
-            let dev = DevSpecification::from(DevMode::Include);
+            let dev = DevGroupsSpecification::from(DevMode::Include);
             (extras, dev)
         }
         DependencyType::Optional(ref extra_name) => {
             let extras = ExtrasSpecification::Some(vec![extra_name.clone()]);
-            let dev = DevSpecification::from(DevMode::Exclude);
+            let dev = DevGroupsSpecification::from(DevMode::Exclude);
             (extras, dev)
         }
         DependencyType::Group(ref group_name) => {
             let extras = ExtrasSpecification::None;
-            let dev = DevSpecification::Include(vec![group_name.clone()]);
+            let dev =
+                DevGroupsSpecification::from(GroupsSpecification::Include(
+                    vec![group_name.clone()],
+                ));
             (extras, dev)
         }
     };

crates/uv/src/commands/project/export.rs

@@ -8,7 +8,7 @@ use std::path::{Path, PathBuf};
 use uv_cache::Cache;
 use uv_client::Connectivity;
 use uv_configuration::{
-    Concurrency, DevMode, DevSpecification, EditableMode, ExportFormat, ExtrasSpecification,
+    Concurrency, DevGroupsSpecification, EditableMode, ExportFormat, ExtrasSpecification,
     InstallOptions, LowerBound,
 };
 use uv_normalize::PackageName;
@@ -33,7 +33,7 @@ pub(crate) async fn export(
     install_options: InstallOptions,
     output_file: Option<PathBuf>,
     extras: ExtrasSpecification,
-    dev: DevMode,
+    dev: DevGroupsSpecification,
     editable: EditableMode,
     locked: bool,
     frozen: bool,
@@ -141,7 +141,7 @@ pub(crate) async fn export(
                 &lock,
                 project.project_name(),
                 &extras,
-                &DevSpecification::from(dev),
+                &dev.with_default_dev(),
                 editable,
                 hashes,
                 &install_options,

crates/uv/src/commands/project/remove.rs

@@ -6,8 +6,8 @@ use owo_colors::OwoColorize;
 use uv_cache::Cache;
 use uv_client::Connectivity;
 use uv_configuration::{
-    Concurrency, DevMode, DevSpecification, EditableMode, ExtrasSpecification, InstallOptions,
-    LowerBound,
+    Concurrency, DevGroupsSpecification, DevMode, EditableMode, ExtrasSpecification,
+    InstallOptions, LowerBound,
 };
 use uv_fs::Simplified;
 use uv_pep508::PackageName;
@@ -215,7 +215,7 @@ pub(crate) async fn remove(
         &venv,
         &lock,
         &extras,
-        &DevSpecification::from(dev),
+        &DevGroupsSpecification::from(dev),
         EditableMode::Editable,
         install_options,
         Modifications::Exact,