crate-inspector 0.4.0

pub mod format;

use std::io::Write;
use std::ops::Deref;
use std::path::Path;

use rustdoc_json::Color;
use rustdoc_types::{Id, Type};

pub trait CrateItem<'a> {
    type Inner;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner>;
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, inner: &'a Self::Inner) -> Self;
    fn krate(&self) -> &'a Crate;
    fn item(&self) -> &'a rustdoc_types::Item;
    fn inner(&self) -> &'a Self::Inner;
    fn is_public(&self) -> bool {
        self.item().visibility == rustdoc_types::Visibility::Public
    }
    fn is_crate_item(&self) -> bool {
        self.item().crate_id == 0
    }
    fn is_root_item(&self) -> bool {
        self.module()
            .is_some_and(|module| module.id() == &self.krate().root)
    }
    fn is_external_item(&self) -> bool {
        self.item().crate_id != 0
    }
    fn id(&'a self) -> &'a Id {
        &self.item().id
    }
    fn module(&self) -> Option<ModuleItem<'a>> {
        self.krate()
            .all_modules()
            .find(|module| module.module.items.contains(&self.item().id))
    }
}

pub trait HasType {
    fn type_(&self) -> &Type;
}

pub trait HasName {
    fn name(&self) -> &str;
}

macro_rules! impl_items {
    ($ty: ident < $l: lifetime >) => {
        impl<$l> $ty<$l> {
            pub fn constants(&self) -> impl Iterator<Item = ConstantItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<ConstantItem>(item))
            }

            pub fn functions(&self) -> impl Iterator<Item = FunctionItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<FunctionItem>(item))
            }

            pub fn structs(&self) -> impl Iterator<Item = StructItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<StructItem>(item))
            }

            pub fn enums(&self) -> impl Iterator<Item = EnumItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<EnumItem>(item))
            }

            pub fn traits(&self) -> impl Iterator<Item = TraitItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<TraitItem>(item))
            }

            pub fn type_aliases(&self) -> impl Iterator<Item = TypeAliasItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<TypeAliasItem>(item))
            }

            pub fn trait_aliases(&self) -> impl Iterator<Item = TraitAliasItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<TraitAliasItem>(item))
            }

            pub fn unions(&self) -> impl Iterator<Item = UnionItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<UnionItem>(item))
            }

            pub fn modules(&self) -> impl Iterator<Item = ModuleItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<ModuleItem>(item))
            }

            pub fn impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<ImplItem>(item))
            }

            pub fn uses(&self) -> impl Iterator<Item = UseItem<'_>> {
                self.items()
                    .filter_map(|item| self.krate().downcast::<UseItem>(item))
            }

            /// Get an item by its name.
            pub fn get_item(&self, name: &str) -> Option<&rustdoc_types::Item> {
                self.items()
                    .find(|item| item.name.as_ref().is_some_and(|n| n == name))
            }

            /// Get a constant by its name.
            pub fn get_constant(&self, name: &str) -> Option<ConstantItem<'_>> {
                self.constants().find(|constant| constant.name() == name)
            }

            /// Get a function by its name.
            pub fn get_function(&self, name: &str) -> Option<FunctionItem<'_>> {
                self.functions().find(|func| func.name() == name)
            }

            /// Get a struct by its name.
            pub fn get_struct(&self, name: &str) -> Option<StructItem<'_>> {
                self.structs().find(|struct_| struct_.name() == name)
            }

            /// Get an enum by its name.
            pub fn get_enum(&self, name: &str) -> Option<EnumItem<'_>> {
                self.enums().find(|enum_| enum_.name() == name)
            }

            /// Get a trait by its name.
            pub fn get_trait(&self, name: &str) -> Option<TraitItem<'_>> {
                self.traits().find(|trait_| trait_.name() == name)
            }

            /// Get a type alias by its name.
            pub fn get_type_alias(&self, name: &str) -> Option<TypeAliasItem<'_>> {
                self.type_aliases()
                    .find(|type_alias| type_alias.name() == name)
            }

            /// Get a trait alias by its name.
            pub fn get_trait_alias(&self, name: &str) -> Option<TraitAliasItem<'_>> {
                self.trait_aliases()
                    .find(|trait_alias| trait_alias.name() == name)
            }

            /// Get a union by its name.
            pub fn get_union(&self, name: &str) -> Option<UnionItem<'_>> {
                self.unions().find(|union| union.name() == name)
            }

            /// Get a module by its name.
            pub fn get_module(&self, name: &str) -> Option<ModuleItem<'_>> {
                self.modules().find(|module| module.name() == name)
            }
        }
    };
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct ModuleItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    module: &'a rustdoc_types::Module,
}

impl<'a> CrateItem<'a> for ModuleItem<'a> {
    type Inner = rustdoc_types::Module;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Module(module) => Some(module),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, module: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            module,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.module
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for ModuleItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> ModuleItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn item_ids(&self) -> impl Iterator<Item = &Id> {
        self.module.items.iter()
    }

    pub fn items(&self) -> impl Iterator<Item = &rustdoc_types::Item> {
        self.item_ids().map(|id| &self.krate.index[id])
    }

    pub fn parent(&self) -> Option<ModuleItem<'a>> {
        self.krate
            .all_modules()
            .find(|module| module.module.items.contains(&self.item.id))
    }

    pub fn is_crate(&self) -> bool {
        self.module.is_crate
    }

    pub fn is_stripped(&self) -> bool {
        self.module.is_stripped
    }
}

impl_items!(ModuleItem<'a>);

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct FunctionItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    func: &'a rustdoc_types::Function,
}

impl<'a> CrateItem<'a> for FunctionItem<'a> {
    type Inner = rustdoc_types::Function;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Function(func) => Some(func),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, func: &'a Self::Inner) -> Self {
        Self { krate, item, func }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.func
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for FunctionItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> FunctionItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn is_method(&self) -> bool {
        self.func
            .sig
            .inputs
            .first()
            .is_some_and(|(name, _)| name == "self")
    }

    pub fn is_associated(&self) -> bool {
        self.krate
            .all_impls()
            .any(|imp| imp.item_ids().any(|id| id == &self.item.id))
    }

    pub fn associated_impl(&self) -> Option<ImplItem<'a>> {
        self.krate
            .all_impls()
            .find(|imp| imp.item_ids().any(|id| id == &self.item.id))
    }

    pub fn inputs(&self) -> impl Iterator<Item = &(String, Type)> {
        self.func.sig.inputs.iter()
    }

    pub fn output(&self) -> Option<&Type> {
        self.func.sig.output.as_ref()
    }

    pub fn sig(&self) -> &rustdoc_types::FunctionSignature {
        &self.func.sig
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.func.generics
    }

    pub fn header(&self) -> &rustdoc_types::FunctionHeader {
        &self.func.header
    }

    pub fn has_body(&self) -> bool {
        self.func.has_body
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct ConstantItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    constant_item: &'a rustdoc_types::ItemEnum,
}

impl<'a> CrateItem<'a> for ConstantItem<'a> {
    type Inner = rustdoc_types::ItemEnum;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Constant { .. } => Some(inner),
            _ => None,
        }
    }
    fn new(
        krate: &'a Crate,
        item: &'a rustdoc_types::Item,
        constant_item: &'a Self::Inner,
    ) -> Self {
        Self {
            krate,
            item,
            constant_item,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.constant_item
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for ConstantItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl HasType for ConstantItem<'_> {
    fn type_(&self) -> &Type {
        let rustdoc_types::ItemEnum::Constant { type_, .. } = &self.constant_item else {
            unreachable!();
        };
        type_
    }
}

impl<'a> ConstantItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn type_(&self) -> &Type {
        let rustdoc_types::ItemEnum::Constant { type_, .. } = &self.constant_item else {
            unreachable!();
        };
        type_
    }

    pub fn expr(&self) -> &str {
        let rustdoc_types::ItemEnum::Constant { const_, .. } = &self.constant_item else {
            unreachable!();
        };
        &const_.expr
    }

    pub fn value(&self) -> Option<&str> {
        let rustdoc_types::ItemEnum::Constant { const_, .. } = &self.constant_item else {
            unreachable!();
        };
        const_.value.as_deref()
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct StaticItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    static_: &'a rustdoc_types::Static,
}

impl<'a> CrateItem<'a> for StaticItem<'a> {
    type Inner = rustdoc_types::Static;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Static(static_) => Some(static_),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, static_: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            static_,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.static_
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for StaticItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl HasType for StaticItem<'_> {
    fn type_(&self) -> &Type {
        &self.static_.type_
    }
}

impl<'a> StaticItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn type_(&self) -> &Type {
        &self.static_.type_
    }

    pub fn expr(&self) -> &str {
        &self.static_.expr
    }

    pub fn is_mutable(&self) -> bool {
        self.static_.is_mutable
    }

    pub fn is_unsafe(&self) -> bool {
        self.static_.is_unsafe
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct StructItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    struct_: &'a rustdoc_types::Struct,
}

impl<'a> CrateItem<'a> for StructItem<'a> {
    type Inner = rustdoc_types::Struct;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Struct(struct_) => Some(struct_),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, struct_: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            struct_,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.struct_
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for StructItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> StructItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn field_ids(&self) -> Option<impl Iterator<Item = &Id>> {
        match &self.struct_.kind {
            rustdoc_types::StructKind::Unit => None,
            rustdoc_types::StructKind::Tuple(_) => None,
            rustdoc_types::StructKind::Plain { fields, .. } => Some(fields.iter()),
        }
    }

    pub fn fields(&self) -> Option<impl Iterator<Item = FieldItem<'_>>> {
        self.field_ids().map(|ids| {
            ids.map(|id| {
                let item = &self.krate.index[id];
                let rustdoc_types::ItemEnum::StructField(field) = &item.inner else {
                    panic!("expected struct field, got {:?}", item.inner);
                };
                FieldItem {
                    krate: self.krate,
                    item,
                    field,
                }
            })
        })
    }

    pub fn impl_ids(&self) -> impl Iterator<Item = &Id> {
        self.struct_.impls.iter()
    }

    pub fn impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impl_ids().map(|id| {
            let item = &self.krate.index[id];
            let rustdoc_types::ItemEnum::Impl(imp) = &item.inner else {
                panic!("expected impl, got {:?}", item.inner);
            };
            ImplItem {
                krate: self.krate,
                item,
                impl_: imp,
            }
        })
    }

    /// Iterate over struct impls that are trait impls (`impl <Trait> for <Struct> { ... }`).
    /// These may include auto/blanket impls.
    pub fn trait_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impls().filter(|imp| imp.trait_().is_some())
    }

    /// Iterate over struct blanket impls (`impl<T: ...> <Trait> for <Struct<T>> { ... }`).
    pub fn blanket_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.trait_impls()
            .filter(|imp| imp.impl_.blanket_impl.is_some())
    }

    /// Iterate over struct non-blanket impls (`impl <Trait> for <Struct> { ... }`).
    pub fn non_blanket_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.trait_impls()
            .filter(|imp| imp.impl_.blanket_impl.is_none())
    }

    /// Iterator over struct impls that are not trait impls.
    pub fn associated_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impls().filter(|imp| imp.trait_().is_none())
    }

    pub fn kind(&self) -> &rustdoc_types::StructKind {
        &self.struct_.kind
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.struct_.generics
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct FieldItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    field: &'a rustdoc_types::Type,
}

impl<'a> CrateItem<'a> for FieldItem<'a> {
    type Inner = rustdoc_types::Type;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::StructField(field) => Some(field),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, field: &'a Self::Inner) -> Self {
        Self { krate, item, field }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.field
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl<'a> HasType for FieldItem<'a> {
    fn type_(&self) -> &Type {
        self.field
    }
}

impl HasName for FieldItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> FieldItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn type_(&self) -> &Type {
        self.field
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct TraitItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    trait_: &'a rustdoc_types::Trait,
}

impl<'a> CrateItem<'a> for TraitItem<'a> {
    type Inner = rustdoc_types::Trait;
    fn downcast(inner: &'a rustdoc_types::ItemEnum) -> Option<&'a Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Trait(trait_) => Some(trait_),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, trait_: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            trait_,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.trait_
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for TraitItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> TraitItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn item_ids(&self) -> impl Iterator<Item = &Id> {
        self.trait_.items.iter()
    }

    pub fn items(&self) -> impl Iterator<Item = &rustdoc_types::Item> {
        self.item_ids().map(|id| &self.krate.index[id])
    }

    pub fn impl_ids(&self) -> impl Iterator<Item = &Id> {
        self.trait_.implementations.iter()
    }

    pub fn impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impl_ids().map(|id| {
            let item = &self.krate.index[id];
            let rustdoc_types::ItemEnum::Impl(imp) = &item.inner else {
                panic!("expected impl, got {:?}", item.inner);
            };
            ImplItem {
                krate: self.krate,
                item,
                impl_: imp,
            }
        })
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.trait_.generics
    }

    pub fn bounds(&self) -> &[rustdoc_types::GenericBound] {
        &self.trait_.bounds
    }

    pub fn is_auto(&self) -> bool {
        self.trait_.is_auto
    }

    pub fn is_unsafe(&self) -> bool {
        self.trait_.is_unsafe
    }

    pub fn is_dyn_compatible(&self) -> bool {
        self.trait_.is_dyn_compatible
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct EnumItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    enum_: &'a rustdoc_types::Enum,
}

impl<'a> CrateItem<'a> for EnumItem<'a> {
    type Inner = rustdoc_types::Enum;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Enum(enum_) => Some(enum_),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, enum_: &'a Self::Inner) -> Self {
        Self { krate, item, enum_ }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.enum_
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for EnumItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> EnumItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn variant_ids(&self) -> impl Iterator<Item = &Id> {
        self.enum_.variants.iter()
    }

    pub fn variants(&self) -> impl Iterator<Item = VariantItem<'_>> {
        self.variant_ids().map(|id| {
            let item = &self.krate.index[id];
            let rustdoc_types::ItemEnum::Variant(variant) = &item.inner else {
                panic!("expected variant, got {:?}", item.inner);
            };
            VariantItem {
                krate: self.krate,
                item,
                variant,
            }
        })
    }

    pub fn impl_ids(&self) -> impl Iterator<Item = &Id> {
        self.enum_.impls.iter()
    }

    pub fn impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impl_ids().map(|id| {
            let item = &self.krate.index[id];
            let rustdoc_types::ItemEnum::Impl(imp) = &item.inner else {
                panic!("expected impl, got {:?}", item.inner);
            };
            ImplItem {
                krate: self.krate,
                item,
                impl_: imp,
            }
        })
    }

    pub fn trait_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impls().filter(|imp| imp.trait_().is_some())
    }

    pub fn blanket_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.trait_impls()
            .filter(|imp| imp.impl_.blanket_impl.is_some())
    }

    pub fn non_blanket_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.trait_impls()
            .filter(|imp| imp.impl_.blanket_impl.is_none())
    }

    /// Iterator over struct impls that are not trait impls.
    pub fn associated_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impls().filter(|imp| imp.trait_().is_none())
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.enum_.generics
    }

    pub fn has_stripped_variants(&self) -> bool {
        self.enum_.has_stripped_variants
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct VariantItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    variant: &'a rustdoc_types::Variant,
}

impl<'a> CrateItem<'a> for VariantItem<'a> {
    type Inner = rustdoc_types::Variant;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Variant(variant) => Some(variant),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, variant: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            variant,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.variant
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for VariantItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> VariantItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn kind(&self) -> &rustdoc_types::VariantKind {
        &self.variant.kind
    }

    pub fn discriminant(&self) -> Option<&rustdoc_types::Discriminant> {
        self.variant.discriminant.as_ref()
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct UnionItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    union: &'a rustdoc_types::Union,
}

impl<'a> CrateItem<'a> for UnionItem<'a> {
    type Inner = rustdoc_types::Union;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Union(union) => Some(union),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, union: &'a Self::Inner) -> Self {
        Self { krate, item, union }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.union
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for UnionItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> UnionItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn field_ids(&self) -> impl Iterator<Item = &Id> {
        self.union.fields.iter()
    }

    pub fn fields(&self) -> impl Iterator<Item = FieldItem<'_>> {
        self.field_ids().map(|id| {
            let item = &self.krate.index[id];
            let rustdoc_types::ItemEnum::StructField(field) = &item.inner else {
                panic!("expected struct field, got {:?}", item.inner);
            };
            FieldItem {
                krate: self.krate,
                item,
                field,
            }
        })
    }

    pub fn impl_ids(&self) -> impl Iterator<Item = &Id> {
        self.union.impls.iter()
    }

    pub fn impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impl_ids().map(|id| {
            let item = &self.krate.index[id];
            let rustdoc_types::ItemEnum::Impl(imp) = &item.inner else {
                panic!("expected impl, got {:?}", item.inner);
            };
            ImplItem {
                krate: self.krate,
                item,
                impl_: imp,
            }
        })
    }

    pub fn trait_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impls().filter(|imp| imp.trait_().is_some())
    }

    pub fn blanket_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.trait_impls()
            .filter(|imp| imp.impl_.blanket_impl.is_some())
    }

    pub fn non_blanket_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.trait_impls()
            .filter(|imp| imp.impl_.blanket_impl.is_none())
    }

    /// Iterator over struct impls that are not trait impls.
    pub fn associated_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.impls().filter(|imp| imp.trait_().is_none())
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.union.generics
    }

    pub fn has_stripped_fields(&self) -> bool {
        self.union.has_stripped_fields
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct TypeAliasItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    type_alias: &'a rustdoc_types::TypeAlias,
}

impl<'a> CrateItem<'a> for TypeAliasItem<'a> {
    type Inner = rustdoc_types::TypeAlias;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::TypeAlias(type_alias) => Some(type_alias),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, type_alias: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            type_alias,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.type_alias
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for TypeAliasItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> TypeAliasItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn type_(&self) -> &Type {
        &self.type_alias.type_
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.type_alias.generics
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct TraitAliasItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    trait_alias: &'a rustdoc_types::TraitAlias,
}

impl<'a> CrateItem<'a> for TraitAliasItem<'a> {
    type Inner = rustdoc_types::TraitAlias;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::TraitAlias(trait_alias) => Some(trait_alias),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, trait_alias: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            trait_alias,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.trait_alias
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for TraitAliasItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> TraitAliasItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.trait_alias.generics
    }

    pub fn params(&self) -> &[rustdoc_types::GenericBound] {
        &self.trait_alias.params
    }
}

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct ImplItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    impl_: &'a rustdoc_types::Impl,
}

impl<'a> CrateItem<'a> for ImplItem<'a> {
    type Inner = rustdoc_types::Impl;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Impl(impl_) => Some(impl_),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, impl_: &'a Self::Inner) -> Self {
        Self { krate, item, impl_ }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.impl_
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl<'a> ImplItem<'a> {
    pub fn id(&self) -> &Id {
        &self.item.id
    }

    pub fn item_ids(&self) -> impl Iterator<Item = &Id> {
        self.impl_.items.iter()
    }

    pub fn items(&self) -> impl Iterator<Item = &rustdoc_types::Item> {
        self.item_ids().map(|id| &self.krate.index[id])
    }

    pub fn trait_(&self) -> Option<&rustdoc_types::Path> {
        self.impl_.trait_.as_ref()
    }

    pub fn for_(&self) -> &rustdoc_types::Type {
        &self.impl_.for_
    }

    pub fn is_unsafe(&self) -> bool {
        self.impl_.is_unsafe
    }

    pub fn generics(&self) -> &rustdoc_types::Generics {
        &self.impl_.generics
    }

    pub fn provided_trait_methods(&self) -> &[String] {
        &self.impl_.provided_trait_methods
    }
}

impl_items!(ImplItem<'a>);

#[derive(Debug, Copy, Clone, PartialEq, Eq)]
pub struct MacroItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    macro_: &'a String,
}

impl<'a> CrateItem<'a> for MacroItem<'a> {
    type Inner = String;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Macro(macro_) => Some(macro_),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, macro_: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            macro_,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.macro_
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl HasName for MacroItem<'_> {
    fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }
}

impl<'a> MacroItem<'a> {
    pub fn name(&self) -> &str {
        self.item.name.as_ref().unwrap()
    }

    pub fn macro_(&self) -> &str {
        self.macro_
    }
}

pub struct UseItem<'a> {
    krate: &'a Crate,
    item: &'a rustdoc_types::Item,
    import: &'a rustdoc_types::Use,
}

impl<'a> CrateItem<'a> for UseItem<'a> {
    type Inner = rustdoc_types::Use;
    fn downcast(inner: &rustdoc_types::ItemEnum) -> Option<&Self::Inner> {
        match inner {
            rustdoc_types::ItemEnum::Use(import) => Some(import),
            _ => None,
        }
    }
    fn new(krate: &'a Crate, item: &'a rustdoc_types::Item, import: &'a Self::Inner) -> Self {
        Self {
            krate,
            item,
            import,
        }
    }
    fn item(&self) -> &'a rustdoc_types::Item {
        self.item
    }
    fn inner(&self) -> &'a Self::Inner {
        self.import
    }
    fn krate(&self) -> &'a Crate {
        self.krate
    }
}

impl UseItem<'_> {
    /// e.g.
    ///
    /// `pub use foo::bar;` -> as_name == "bar", source == "foo::bar", is_glob == false
    ///
    /// `pub use foo::*;` -> as_name == "foo", source == "foo", is_glob == true
    ///
    /// `pub use foo::bar as baz;` -> as_name == "baz", source == "foo::bar", is_glob == false
    pub fn as_name(&self) -> &str {
        &self.import.name
    }

    /// e.g.
    ///
    /// `pub use foo::bar;` -> as_name == "bar", source == "foo::bar", is_glob == false
    ///
    /// `pub use foo::*;` -> as_name == "foo", source == "foo", is_glob == true
    ///
    /// `pub use foo::bar as baz;` -> as_name == "baz", source == "foo::bar", is_glob == false
    pub fn source(&self) -> &str {
        &self.import.source
    }

    pub fn is_glob(&self) -> bool {
        self.import.is_glob
    }
}

#[derive(Clone, PartialEq, Eq)]
pub struct Crate(rustdoc_types::Crate);

impl std::fmt::Debug for Crate {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Crate")
            .field("root", &self.root)
            .field("crate_version", &self.crate_version)
            .field("...", &"...")
            .finish()
    }
}

impl Deref for Crate {
    type Target = rustdoc_types::Crate;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl Crate {
    /// All items in the crate, including external items referenced locally.
    pub fn all_items(&self) -> impl Iterator<Item = &rustdoc_types::Item> {
        self.0.index.values()
    }

    /// Items in the crate, excluding external items referenced locally.
    pub fn items(&self) -> impl Iterator<Item = &rustdoc_types::Item> {
        self.all_items().filter(|&item| item.crate_id == 0)
    }

    pub fn krate(&self) -> &Crate {
        self
    }

    pub fn item_summary(&self) -> impl Iterator<Item = &rustdoc_types::ItemSummary> {
        self.0.paths.values()
    }

    /// Downcast an item to a specific type `T: CrateItem`.
    pub fn downcast<'a, T: CrateItem<'a> + 'a>(
        &'a self,
        item: &'a rustdoc_types::Item,
    ) -> Option<T> {
        let inner = T::downcast(&item.inner)?;
        Some(T::new(self, item, inner))
    }

    pub fn all_modules(&self) -> impl Iterator<Item = ModuleItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<ModuleItem>(item))
    }

    /// root module included
    pub fn modules(&self) -> impl Iterator<Item = ModuleItem<'_>> {
        self.all_modules().filter(|module| module.is_crate_item())
    }

    /// root module not included
    ///
    /// submodules of submodules not included
    pub fn sub_modules(&self) -> impl Iterator<Item = ModuleItem<'_>> {
        self.all_modules().filter(|module| {
            module
                .parent()
                .is_some_and(|parent| parent.id() == &self.root)
        })
    }

    /// Enumerates all functions including submodules.
    /// methods & associated functions & function declarations included
    pub fn all_functions(&self) -> impl Iterator<Item = FunctionItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<FunctionItem>(item))
    }

    /// Enumerates root module functions.
    /// methods & associated functions & function declarations not included
    pub fn functions(&self) -> impl Iterator<Item = FunctionItem<'_>> {
        self.all_functions().filter(|func| {
            func.is_root_item() && !func.is_method() && !func.is_associated() && func.func.has_body
        })
    }

    /// Enumerates all constants including submodules
    pub fn all_constants(&self) -> impl Iterator<Item = ConstantItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<ConstantItem>(item))
    }

    /// Enumerates root module constants
    pub fn constants(&self) -> impl Iterator<Item = ConstantItem<'_>> {
        self.all_constants()
            .filter(|constant| constant.is_root_item())
    }

    /// Enumerates all statics including submodules
    pub fn all_statics(&self) -> impl Iterator<Item = StaticItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<StaticItem>(item))
    }

    /// Enumerates root module statics
    pub fn statics(&self) -> impl Iterator<Item = StaticItem<'_>> {
        self.all_statics().filter(|static_| static_.is_root_item())
    }

    /// Enumerates all structs including submodules
    pub fn all_structs(&self) -> impl Iterator<Item = StructItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<StructItem>(item))
    }

    /// Enumerates root module structs
    pub fn structs(&self) -> impl Iterator<Item = StructItem<'_>> {
        self.all_structs().filter(|struct_| struct_.is_root_item())
    }

    /// Enumerates all traits including submodules
    pub fn all_traits(&self) -> impl Iterator<Item = TraitItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<TraitItem>(item))
    }

    /// Enumerates root module traits
    pub fn traits(&self) -> impl Iterator<Item = TraitItem<'_>> {
        self.all_traits().filter(|trait_| trait_.is_root_item())
    }

    /// Enumerates all enums including submodules
    pub fn all_enums(&self) -> impl Iterator<Item = EnumItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<EnumItem>(item))
    }

    /// Enumerates root module enums
    pub fn enums(&self) -> impl Iterator<Item = EnumItem<'_>> {
        self.all_enums().filter(|enum_| enum_.is_root_item())
    }

    pub fn all_type_aliases(&self) -> impl Iterator<Item = TypeAliasItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<TypeAliasItem>(item))
    }

    pub fn type_aliases(&self) -> impl Iterator<Item = TypeAliasItem<'_>> {
        self.all_type_aliases()
            .filter(|type_alias| type_alias.is_root_item())
    }

    pub fn all_trait_aliases(&self) -> impl Iterator<Item = TraitAliasItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<TraitAliasItem>(item))
    }

    pub fn trait_aliases(&self) -> impl Iterator<Item = TraitAliasItem<'_>> {
        self.all_trait_aliases()
            .filter(|trait_alias| trait_alias.is_root_item())
    }

    pub fn all_unions(&self) -> impl Iterator<Item = UnionItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<UnionItem>(item))
    }

    pub fn unions(&self) -> impl Iterator<Item = UnionItem<'_>> {
        self.all_unions().filter(|union| union.is_root_item())
    }

    /// Enumerates all referenced impls including submodules, std
    pub fn all_impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<ImplItem>(item))
    }

    /// Enumerates root module impls
    pub fn impls(&self) -> impl Iterator<Item = ImplItem<'_>> {
        self.all_impls().filter(|imp| imp.is_root_item())
    }

    /// Enumerates all macros including submodules
    pub fn all_macros(&self) -> impl Iterator<Item = MacroItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<MacroItem>(item))
    }

    /// Enumerates root module macros
    pub fn macros(&self) -> impl Iterator<Item = MacroItem<'_>> {
        self.all_macros().filter(|macro_| macro_.is_root_item())
    }

    /// Enumerates all uses including submodules
    pub fn all_uses(&self) -> impl Iterator<Item = UseItem<'_>> {
        self.all_items()
            .filter_map(|item| self.krate().downcast::<UseItem>(item))
    }

    /// Enumerates root module uses
    pub fn uses(&self) -> impl Iterator<Item = UseItem<'_>> {
        self.all_uses().filter(|import| import.is_root_item())
    }

    /// Get an item by its name.
    pub fn get_item(&self, name: &str) -> Option<&rustdoc_types::Item> {
        self.items()
            .find(|item| item.name.as_ref().is_some_and(|n| n == name))
    }

    /// Get a constant by its name.
    pub fn get_constant(&self, name: &str) -> Option<ConstantItem<'_>> {
        self.constants().find(|constant| constant.name() == name)
    }

    /// Get a function by its name.
    pub fn get_function(&self, name: &str) -> Option<FunctionItem<'_>> {
        self.functions().find(|func| func.name() == name)
    }

    /// Get a struct by its name.
    pub fn get_struct(&self, name: &str) -> Option<StructItem<'_>> {
        self.structs().find(|struct_| struct_.name() == name)
    }

    /// Get an enum by its name.
    pub fn get_enum(&self, name: &str) -> Option<EnumItem<'_>> {
        self.enums().find(|enum_| enum_.name() == name)
    }

    /// Get a trait by its name.
    pub fn get_trait(&self, name: &str) -> Option<TraitItem<'_>> {
        self.traits().find(|trait_| trait_.name() == name)
    }

    /// Get a type alias by its name.
    pub fn get_type_alias(&self, name: &str) -> Option<TypeAliasItem<'_>> {
        self.type_aliases()
            .find(|type_alias| type_alias.name() == name)
    }

    /// Get a trait alias by its name.
    pub fn get_trait_alias(&self, name: &str) -> Option<TraitAliasItem<'_>> {
        self.trait_aliases()
            .find(|trait_alias| trait_alias.name() == name)
    }

    /// Get a union by its name.
    pub fn get_union(&self, name: &str) -> Option<UnionItem<'_>> {
        self.unions().find(|union| union.name() == name)
    }

    /// Get a module by its name.
    pub fn get_module(&self, name: &str) -> Option<ModuleItem<'_>> {
        self.modules().find(|module| module.name() == name)
    }
}

#[derive(Debug)]
pub enum BuildCrateError {
    RustdocJson(rustdoc_json::BuildError),
    Io(std::io::Error),
    Serde(serde_json::Error),
}

impl std::fmt::Display for BuildCrateError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            BuildCrateError::RustdocJson(err) => err.fmt(f),
            BuildCrateError::Io(err) => err.fmt(f),
            BuildCrateError::Serde(err) => err.fmt(f),
        }
    }
}

impl std::error::Error for BuildCrateError {}

impl From<rustdoc_json::BuildError> for BuildCrateError {
    fn from(err: rustdoc_json::BuildError) -> Self {
        Self::RustdocJson(err)
    }
}

impl From<std::io::Error> for BuildCrateError {
    fn from(err: std::io::Error) -> Self {
        Self::Io(err)
    }
}

impl From<serde_json::Error> for BuildCrateError {
    fn from(err: serde_json::Error) -> Self {
        Self::Serde(err)
    }
}

#[derive(Default)]
pub struct CrateBuilder {
    builder: rustdoc_json::Builder,
}

impl CrateBuilder {
    pub fn new() -> Self {
        Self {
            builder: rustdoc_json::Builder::default(),
        }
    }

    pub fn toolchain(mut self, toolchain: impl Into<String>) -> Self {
        self.builder = self.builder.toolchain(toolchain);
        self
    }

    pub fn manifest_path(mut self, manifest_path: impl AsRef<Path>) -> Self {
        self.builder = self.builder.manifest_path(manifest_path);
        self
    }

    pub fn all_features(mut self, all_features: bool) -> Self {
        self.builder = self.builder.all_features(all_features);
        self
    }

    pub fn package(mut self, package: impl AsRef<str>) -> Self {
        self.builder = self.builder.package(package);
        self
    }

    pub fn features(mut self, features: impl IntoIterator<Item = impl AsRef<str>>) -> Self {
        self.builder = self.builder.features(features);
        self
    }

    pub fn no_default_features(mut self, no_default_features: bool) -> Self {
        self.builder = self.builder.no_default_features(no_default_features);
        self
    }

    pub fn target(mut self, target: String) -> Self {
        self.builder = self.builder.target(target);
        self
    }

    pub fn target_dir(mut self, target_dir: impl AsRef<Path>) -> Self {
        self.builder = self.builder.target_dir(target_dir);
        self
    }

    pub fn document_private_items(mut self, document_private_items: bool) -> Self {
        self.builder = self.builder.document_private_items(document_private_items);
        self
    }

    pub fn quiet(mut self, quiet: bool) -> Self {
        self.builder = self.builder.quiet(quiet);
        self
    }

    pub fn silent(mut self, silent: bool) -> Self {
        self.builder = self.builder.silent(silent);
        self
    }

    pub fn color(mut self, color: Color) -> Self {
        self.builder = self.builder.color(color);
        self
    }

    pub fn color_always(mut self, color_always: bool) -> Self {
        if color_always {
            self.builder = self.builder.color(Color::Always);
        }
        self
    }

    pub fn color_never(mut self, color_never: bool) -> Self {
        if color_never {
            self.builder = self.builder.color(Color::Never);
        }
        self
    }

    pub fn cap_lints(mut self, cap_lints: Option<impl AsRef<str>>) -> Self {
        self.builder = self.builder.cap_lints(cap_lints);
        self
    }

    pub fn build(self) -> Result<Crate, BuildCrateError> {
        let path = self.builder.build()?;
        let krate = serde_json::from_reader(std::fs::File::open(path)?).map(Crate)?;
        Ok(krate)
    }

    pub fn build_with_captured_output(
        self,
        stdout: impl Write,
        stderr: impl Write,
    ) -> Result<Crate, BuildCrateError> {
        let path = self.builder.build_with_captured_output(stdout, stderr)?;
        let krate = serde_json::from_reader(std::fs::File::open(path)?).map(Crate)?;
        Ok(krate)
    }
}