docs: Add printing to console example.

example/printing-to-console/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "printing-to-console"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+gmod = {version = "10.2.1", features = ["gmcl"], default-features = false}

example/printing-to-console/README.md

@@ -0,0 +1,4 @@
+# Printing to Console Example
+
+This is an example of using a module to print to console.
+Compiling should follow the instructions in [my-first-binary-module](../my-first-binary-module/README.md).

example/printing-to-console/rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "nightly"

example/printing-to-console/src/lib.rs

@@ -0,0 +1,29 @@
+#![feature(c_unwind)]
+
+use gmod::gmcl::override_stdout;
+use gmod::lua::State;
+
+#[macro_use] extern crate gmod;
+
+#[gmod13_open]
+fn gmod13_open(lua: State) -> i32 {
+    // Here, if this module is running on the client.
+    if lua.is_client() {
+        // We overwrite println! so it prints to the console.
+        override_stdout()
+    }
+
+    if lua.is_server() {
+        println!("Hello Server, this is a binary module!")
+    } else {
+        println!("Hello Client, this is a binary module!")
+    }
+
+    0
+}
+
+#[gmod13_close]
+fn gmod13_close(lua: State) -> i32 {
+    println!("Goodbye from binary module!");
+    0
+}