1 files changed, 248 insertions, 0 deletions
diff --git a/vendor/git2/src/object.rs b/vendor/git2/src/object.rs
new file mode 100644
index 0000000..fcae006
--- /dev/null
+++ b/vendor/git2/src/object.rs
@@ -0,0 +1,248 @@
+use std::marker;
+use std::mem;
+use std::ptr;
+
+use crate::util::Binding;
+use crate::{raw, Blob, Buf, Commit, Error, ObjectType, Oid, Repository, Tag, Tree};
+use crate::{Describe, DescribeOptions};
+
+/// A structure to represent a git [object][1]
+///
+/// [1]: http://git-scm.com/book/en/Git-Internals-Git-Objects
+pub struct Object<'repo> {
+    raw: *mut raw::git_object,
+    _marker: marker::PhantomData<&'repo Repository>,
+}
+
+impl<'repo> Object<'repo> {
+    /// Get the id (SHA1) of a repository object
+    pub fn id(&self) -> Oid {
+        unsafe { Binding::from_raw(raw::git_object_id(&*self.raw)) }
+    }
+
+    /// Get the object type of an object.
+    ///
+    /// If the type is unknown, then `None` is returned.
+    pub fn kind(&self) -> Option<ObjectType> {
+        ObjectType::from_raw(unsafe { raw::git_object_type(&*self.raw) })
+    }
+
+    /// Recursively peel an object until an object of the specified type is met.
+    ///
+    /// If you pass `Any` as the target type, then the object will be
+    /// peeled until the type changes (e.g. a tag will be chased until the
+    /// referenced object is no longer a tag).
+    pub fn peel(&self, kind: ObjectType) -> Result<Object<'repo>, Error> {
+        let mut raw = ptr::null_mut();
+        unsafe {
+            try_call!(raw::git_object_peel(&mut raw, &*self.raw(), kind));
+            Ok(Binding::from_raw(raw))
+        }
+    }
+
+    /// Recursively peel an object until a blob is found
+    pub fn peel_to_blob(&self) -> Result<Blob<'repo>, Error> {
+        self.peel(ObjectType::Blob)
+            .map(|o| o.cast_or_panic(ObjectType::Blob))
+    }
+
+    /// Recursively peel an object until a commit is found
+    pub fn peel_to_commit(&self) -> Result<Commit<'repo>, Error> {
+        self.peel(ObjectType::Commit)
+            .map(|o| o.cast_or_panic(ObjectType::Commit))
+    }
+
+    /// Recursively peel an object until a tag is found
+    pub fn peel_to_tag(&self) -> Result<Tag<'repo>, Error> {
+        self.peel(ObjectType::Tag)
+            .map(|o| o.cast_or_panic(ObjectType::Tag))
+    }
+
+    /// Recursively peel an object until a tree is found
+    pub fn peel_to_tree(&self) -> Result<Tree<'repo>, Error> {
+        self.peel(ObjectType::Tree)
+            .map(|o| o.cast_or_panic(ObjectType::Tree))
+    }
+
+    /// Get a short abbreviated OID string for the object
+    ///
+    /// This starts at the "core.abbrev" length (default 7 characters) and
+    /// iteratively extends to a longer string if that length is ambiguous. The
+    /// result will be unambiguous (at least until new objects are added to the
+    /// repository).
+    pub fn short_id(&self) -> Result<Buf, Error> {
+        unsafe {
+            let buf = Buf::new();
+            try_call!(raw::git_object_short_id(buf.raw(), &*self.raw()));
+            Ok(buf)
+        }
+    }
+
+    /// Attempt to view this object as a commit.
+    ///
+    /// Returns `None` if the object is not actually a commit.
+    pub fn as_commit(&self) -> Option<&Commit<'repo>> {
+        self.cast(ObjectType::Commit)
+    }
+
+    /// Attempt to consume this object and return a commit.
+    ///
+    /// Returns `Err(self)` if this object is not actually a commit.
+    pub fn into_commit(self) -> Result<Commit<'repo>, Object<'repo>> {
+        self.cast_into(ObjectType::Commit)
+    }
+
+    /// Attempt to view this object as a tag.
+    ///
+    /// Returns `None` if the object is not actually a tag.
+    pub fn as_tag(&self) -> Option<&Tag<'repo>> {
+        self.cast(ObjectType::Tag)
+    }
+
+    /// Attempt to consume this object and return a tag.
+    ///
+    /// Returns `Err(self)` if this object is not actually a tag.
+    pub fn into_tag(self) -> Result<Tag<'repo>, Object<'repo>> {
+        self.cast_into(ObjectType::Tag)
+    }
+
+    /// Attempt to view this object as a tree.
+    ///
+    /// Returns `None` if the object is not actually a tree.
+    pub fn as_tree(&self) -> Option<&Tree<'repo>> {
+        self.cast(ObjectType::Tree)
+    }
+
+    /// Attempt to consume this object and return a tree.
+    ///
+    /// Returns `Err(self)` if this object is not actually a tree.
+    pub fn into_tree(self) -> Result<Tree<'repo>, Object<'repo>> {
+        self.cast_into(ObjectType::Tree)
+    }
+
+    /// Attempt to view this object as a blob.
+    ///
+    /// Returns `None` if the object is not actually a blob.
+    pub fn as_blob(&self) -> Option<&Blob<'repo>> {
+        self.cast(ObjectType::Blob)
+    }
+
+    /// Attempt to consume this object and return a blob.
+    ///
+    /// Returns `Err(self)` if this object is not actually a blob.
+    pub fn into_blob(self) -> Result<Blob<'repo>, Object<'repo>> {
+        self.cast_into(ObjectType::Blob)
+    }
+
+    /// Describes a commit
+    ///
+    /// Performs a describe operation on this commitish object.
+    pub fn describe(&self, opts: &DescribeOptions) -> Result<Describe<'_>, Error> {
+        let mut ret = ptr::null_mut();
+        unsafe {
+            try_call!(raw::git_describe_commit(&mut ret, self.raw, opts.raw()));
+            Ok(Binding::from_raw(ret))
+        }
+    }
+
+    fn cast<T>(&self, kind: ObjectType) -> Option<&T> {
+        assert_eq!(mem::size_of::<Object<'_>>(), mem::size_of::<T>());
+        if self.kind() == Some(kind) {
+            unsafe { Some(&*(self as *const _ as *const T)) }
+        } else {
+            None
+        }
+    }
+
+    fn cast_into<T>(self, kind: ObjectType) -> Result<T, Object<'repo>> {
+        assert_eq!(mem::size_of_val(&self), mem::size_of::<T>());
+        if self.kind() == Some(kind) {
+            Ok(unsafe {
+                let other = ptr::read(&self as *const _ as *const T);
+                mem::forget(self);
+                other
+            })
+        } else {
+            Err(self)
+        }
+    }
+}
+
+/// This trait is useful to export cast_or_panic into crate but not outside
+pub trait CastOrPanic {
+    fn cast_or_panic<T>(self, kind: ObjectType) -> T;
+}
+
+impl<'repo> CastOrPanic for Object<'repo> {
+    fn cast_or_panic<T>(self, kind: ObjectType) -> T {
+        assert_eq!(mem::size_of_val(&self), mem::size_of::<T>());
+        if self.kind() == Some(kind) {
+            unsafe {
+                let other = ptr::read(&self as *const _ as *const T);
+                mem::forget(self);
+                other
+            }
+        } else {
+            let buf;
+            let akind = match self.kind() {
+                Some(akind) => akind.str(),
+                None => {
+                    buf = format!("unknown ({})", unsafe { raw::git_object_type(&*self.raw) });
+                    &buf
+                }
+            };
+            panic!(
+                "Expected object {} to be {} but it is {}",
+                self.id(),
+                kind.str(),
+                akind
+            )
+        }
+    }
+}
+
+impl<'repo> Clone for Object<'repo> {
+    fn clone(&self) -> Object<'repo> {
+        let mut raw = ptr::null_mut();
+        unsafe {
+            let rc = raw::git_object_dup(&mut raw, self.raw);
+            assert_eq!(rc, 0);
+            Binding::from_raw(raw)
+        }
+    }
+}
+
+impl<'repo> std::fmt::Debug for Object<'repo> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
+        let mut ds = f.debug_struct("Object");
+        match self.kind() {
+            Some(kind) => ds.field("kind", &kind),
+            None => ds.field(
+                "kind",
+                &format!("Unknow ({})", unsafe { raw::git_object_type(&*self.raw) }),
+            ),
+        };
+        ds.field("id", &self.id());
+        ds.finish()
+    }
+}
+
+impl<'repo> Binding for Object<'repo> {
+    type Raw = *mut raw::git_object;
+
+    unsafe fn from_raw(raw: *mut raw::git_object) -> Object<'repo> {
+        Object {
+            raw,
+            _marker: marker::PhantomData,
+        }
+    }
+    fn raw(&self) -> *mut raw::git_object {
+        self.raw
+    }
+}
+
+impl<'repo> Drop for Object<'repo> {
+    fn drop(&mut self) {
+        unsafe { raw::git_object_free(self.raw) }
+    }
+}