From 65b5a3112a4d1bfc9c3775b3cf241ff87b49e858 Mon Sep 17 00:00:00 2001
From: Rob Napier <rob@neverwood.org>
Date: Tue, 23 Nov 2021 18:01:39 -0500
Subject: [PATCH] Basic version of NSError

---
 .gitignore     |  1 +
 src/error.rs   | 27 +++++++++++++++++++++++++++
 src/lib.rs     |  4 ++++
 src/runtime.rs |  2 ++
 4 files changed, 34 insertions(+)
 create mode 100644 src/error.rs
 create mode 100644 src/runtime.rs

diff --git a/.gitignore b/.gitignore
index 1689f08..685e1bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 doc/
 target/
 Cargo.lock
+.idea
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..23f7f56
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,27 @@
+use objc_id::Id;
+use {INSObject, NSInteger, NSDictionary, NSString, INSString};
+
+pub type NSErrorUserInfoKey = NSString;
+
+#[allow(non_snake_case)]
+pub fn NSLocalizedDescriptionKey() -> Id<NSString> {
+    NSString::from_str(&"NSLocalizedDescription")
+}
+
+pub trait INSError: INSObject {
+    fn new<T>(code: NSInteger, domain: Id<NSString>, user_info: Id<NSDictionary<NSErrorUserInfoKey, T>>) -> Id<Self> {
+        let cls = Self::class();
+        unsafe {
+            let obj: *mut Self = msg_send![cls, alloc];
+            let obj: *mut Self = msg_send![obj, initWithDomain:domain
+                                                          code:code
+                                                      userInfo:user_info];
+            Id::from_retained_ptr(obj)
+        }
+    }
+}
+
+object_struct!(NSError);
+
+impl INSError for NSError {}
+
diff --git a/src/lib.rs b/src/lib.rs
index 65bbd01..64121cf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,7 +14,9 @@ pub use self::array::{
 pub use self::data::{INSData, INSMutableData, NSData, NSMutableData};
 pub use self::dictionary::{INSDictionary, NSDictionary};
 pub use self::enumerator::{INSFastEnumeration, NSEnumerator, NSFastEnumerator};
+pub use self::error::{INSError, NSError, NSLocalizedDescriptionKey};
 pub use self::object::{INSObject, NSObject};
+pub use self::runtime::{NSInteger, NSUInteger};
 pub use self::string::{INSCopying, INSMutableCopying, INSString, NSString};
 pub use self::value::{INSValue, NSValue};
 
@@ -28,6 +30,8 @@ mod array;
 mod data;
 mod dictionary;
 mod enumerator;
+mod error;
 mod object;
+mod runtime;
 mod string;
 mod value;
diff --git a/src/runtime.rs b/src/runtime.rs
new file mode 100644
index 0000000..b36fdba
--- /dev/null
+++ b/src/runtime.rs
@@ -0,0 +1,2 @@
+pub type NSInteger = isize;
+pub type NSUInteger = usize;