From 23b12a57e220967acafe59f65d7599daa6fee646 Mon Sep 17 00:00:00 2001
From: Corbin Crutchley <git@crutchcorn.dev>
Date: Tue, 27 Jan 2026 23:57:37 -0800
Subject: [PATCH] chore: conditionally call code via OS build-time changes

---
 .gitignore    |  3 ++-
 build.rs      |  4 ++++
 hello/hello.c | 14 ++++++++++++++
 hello/hello.h |  1 +
 src/main.rs   | 19 +++++++++++++++++--
 5 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/.gitignore b/.gitignore
index 6b39d31..8815d3b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 /target
-.idea/
\ No newline at end of file
+.idea/
+.DS_Store
\ No newline at end of file
diff --git a/build.rs b/build.rs
index 21e0206..a0ed8da 100644
--- a/build.rs
+++ b/build.rs
@@ -3,6 +3,10 @@ use std::{env, path::PathBuf};
 fn main() {
     let target = env::var("TARGET").unwrap();
 
+    // Re-run this build script if the C source or header changes
+    println!("cargo:rerun-if-changed=hello/hello.c");
+    println!("cargo:rerun-if-changed=hello/hello.h");
+
     cc::Build::new().file("hello/hello.c").compile("hello");
 
     let bindings = bindgen::builder()
diff --git a/hello/hello.c b/hello/hello.c
index a7e61c7..ec4b9ba 100644
--- a/hello/hello.c
+++ b/hello/hello.c
@@ -1,3 +1,17 @@
 int hello() {
     return 42;
 }
+
+const char* get_os_name() {
+#if defined(_WIN32) || defined(_WIN64)
+    return "Windows";
+#elif defined(__APPLE__) && defined(__MACH__)
+    return "macOS";
+#elif defined(__linux__)
+    return "Linux";
+#elif defined(__unix__)
+    return "Unix";
+#else
+    return "Unknown";
+#endif
+}
diff --git a/hello/hello.h b/hello/hello.h
index e8035e8..5613399 100644
--- a/hello/hello.h
+++ b/hello/hello.h
@@ -1 +1,2 @@
 int hello();
+const char* get_os_name();
diff --git a/src/main.rs b/src/main.rs
index c638f22..e12addf 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,20 @@
-use rust_multi_os_template::hello;
+use std::ffi::CStr;
+use rust_multi_os_template::{hello, get_os_name};
 
 fn main() {
-    println!("Hello, world!{}", unsafe {hello()}.to_string());
+    println!("Hello, world! {}", unsafe { hello() });
+    
+    let os_name = unsafe {
+        CStr::from_ptr(get_os_name())
+    };
+    println!("Running on: {}", os_name.to_str().unwrap());
+
+    #[cfg(target_os = "macos")]
+    println!("Your wallet called—it's crying about that MacBook purchase.");
+
+    #[cfg(target_os = "windows")]
+    println!("Updating... please wait 3-5 business days.");
+
+    #[cfg(target_os = "linux")]
+    println!("I use Rust btw.");
 }
-- 
2.51.2