From e37bd54df43461cd84f0f11e369daf4d459b100f Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Sun, 19 Apr 2015 10:44:03 -0700
Subject: [PATCH] Add Python to Rust example

---
 python-to-rust/Cargo.toml  | 8 ++++++++
 python-to-rust/Makefile    | 9 +++++++++
 python-to-rust/src/lib.rs  | 4 ++++
 python-to-rust/src/main.py | 8 ++++++++
 4 files changed, 29 insertions(+)
 create mode 100644 python-to-rust/Cargo.toml
 create mode 100644 python-to-rust/Makefile
 create mode 100644 python-to-rust/src/lib.rs
 create mode 100644 python-to-rust/src/main.py

diff --git a/python-to-rust/Cargo.toml b/python-to-rust/Cargo.toml
new file mode 100644
index 0000000..e1f1675
--- /dev/null
+++ b/python-to-rust/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "python-to-rust"
+version = "0.1.0"
+authors = ["Alex Crichton <alex@alexcrichton.com>"]
+
+[lib]
+name = "double_input"
+crate-type = ["dylib"]
diff --git a/python-to-rust/Makefile b/python-to-rust/Makefile
new file mode 100644
index 0000000..583a843
--- /dev/null
+++ b/python-to-rust/Makefile
@@ -0,0 +1,9 @@
+all: target/libdouble_input.so
+	python src/main.py
+
+target/libdouble_input.so: src/lib.rs Cargo.toml
+	cargo build
+	(cd target && ln -nsf debug/libdouble_input-* libdouble_input.so)
+
+clean:
+	rm -rf target
diff --git a/python-to-rust/src/lib.rs b/python-to-rust/src/lib.rs
new file mode 100644
index 0000000..bf573d1
--- /dev/null
+++ b/python-to-rust/src/lib.rs
@@ -0,0 +1,4 @@
+#[no_mangle]
+pub extern fn double_input(input: i32) -> i32 {
+    input * 2
+}
diff --git a/python-to-rust/src/main.py b/python-to-rust/src/main.py
new file mode 100644
index 0000000..19a02c6
--- /dev/null
+++ b/python-to-rust/src/main.py
@@ -0,0 +1,8 @@
+from ctypes import cdll
+
+lib = cdll.LoadLibrary('target/libdouble_input.so')
+double_input = lib.double_input
+
+input = 4
+output = double_input(input)
+print(str(input) + " * 2 = " + str(output))