Add JSON Schema support (#3046)

## Summary

This PR adds JSON Schema support. The setup mirrors Ruff's own.

crates/uv-configuration/Cargo.toml

@@ -22,6 +22,7 @@ anyhow = { workspace = true }
 clap = { workspace = true, features = ["derive"], optional = true }
 itertools = { workspace = true }
 rustc-hash = { workspace = true }
+schemars = { workspace = true, optional = true }
 serde = { workspace = true, optional = true }
 serde_json = { workspace = true, optional = true }
 

crates/uv-configuration/src/authentication.rs

@@ -8,6 +8,7 @@ use uv_auth::{self, KeyringProvider};
     feature = "serde",
     serde(deny_unknown_fields, rename_all = "kebab-case")
 )]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 pub enum KeyringProviderType {
     /// Do not use keyring for credential lookup.
     #[default]

crates/uv-configuration/src/build_options.rs

@@ -203,6 +203,7 @@ impl NoBuild {
     feature = "serde",
     serde(deny_unknown_fields, rename_all = "kebab-case")
 )]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 pub enum IndexStrategy {
     /// Only use results from the first index that returns a match for a given package name.
     ///

crates/uv-configuration/src/config_settings.rs

@@ -28,6 +28,7 @@ impl FromStr for ConfigSettingEntry {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 enum ConfigSettingValue {
     /// The value consists of a single string.
     String(String),
@@ -82,6 +83,7 @@ impl<'de> serde::Deserialize<'de> for ConfigSettingValue {
 ///
 /// See: <https://peps.python.org/pep-0517/#config-settings>
 #[derive(Debug, Default, Clone)]
+#[cfg_attr(feature = "schemars", derive(schemars::JsonSchema))]
 #[cfg_attr(not(feature = "serde"), allow(dead_code))]
 pub struct ConfigSettings(BTreeMap<String, ConfigSettingValue>);
 

crates/uv-configuration/src/name_specifiers.rs

@@ -59,6 +59,29 @@ impl<'de> serde::Deserialize<'de> for PackageNameSpecifier {
     }
 }
 
+#[cfg(feature = "schemars")]
+impl schemars::JsonSchema for PackageNameSpecifier {
+    fn schema_name() -> String {
+        "PackageNameSpecifier".to_string()
+    }
+
+    fn json_schema(_gen: &mut schemars::gen::SchemaGenerator) -> schemars::schema::Schema {
+        schemars::schema::SchemaObject {
+            instance_type: Some(schemars::schema::InstanceType::String.into()),
+            string: Some(Box::new(schemars::schema::StringValidation {
+                // See: https://packaging.python.org/en/latest/specifications/name-normalization/#name-format
+                pattern: Some(
+                    r"^(:none:|:all:|([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9._-]*[a-zA-Z0-9]))$"
+                        .to_string(),
+                ),
+                ..schemars::schema::StringValidation::default()
+            })),
+            ..schemars::schema::SchemaObject::default()
+        }
+        .into()
+    }
+}
+
 /// Package name specification.
 ///
 /// Consumes both package names and selection directives for compatibility with pip flags