From 3c4aeef1cc179135155fc4292dd7282c64a30ca2 Mon Sep 17 00:00:00 2001
From: soup <code@soup.land>
Date: Tue, 14 May 2024 22:54:13 -0400
Subject: [PATCH] Initial commit

---
 .gitignore |  1 +
 Cargo.lock |  7 +++++++
 Cargo.toml |  6 ++++++
 src/lib.rs | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 66 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5e3385c
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "stilts"
+version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..f36477e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "stilts"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..da9c8d3
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,52 @@
+pub struct OutOfSpace;
+pub trait Push<T> {
+    fn push(&mut self, value: T) {
+        let _ = self.push_checked(value);
+    }
+
+    fn push_checked(&mut self, value: T) -> Result<(), OutOfSpace> {
+        self.push(value);
+
+        Ok(())
+    }
+}
+
+impl<T> Push<T> for () {
+    fn push(&mut self, _: T) {
+    }
+}
+
+impl<T> Push<T> for Vec<T> {
+    fn push(&mut self, value: T) {
+        self.push(value)
+    }
+}
+
+impl<T> Push<T> for Option<T> {
+    fn push(&mut self, value: T) {
+        *self = Some(value);
+    }
+
+    fn push_checked(&mut self, value: T) -> Result<(), OutOfSpace> {
+        match self {
+            Some(_) => Err(OutOfSpace),
+            None => {
+                self.push(value);
+                Ok(())
+            },
+        }
+    }
+}
+
+impl<'a, R, T> Push<T> for &'a mut R
+where
+    R: Push<T>,
+{
+    fn push(&mut self, value: T) {
+        (**self).push(value)
+    }
+
+    fn push_checked(&mut self, value: T) -> Result<(), OutOfSpace> {
+        (**self).push_checked(value)
+    }
+}