From 4f055167837f26e87ad1da77dc295769399a7aac Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sat, 17 Jun 2017 01:19:21 +0200
Subject: [PATCH 1/3] Add a simple repl example

---
 examples/repl.rs | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 examples/repl.rs

diff --git a/examples/repl.rs b/examples/repl.rs
new file mode 100644
index 0000000..6691f0b
--- /dev/null
+++ b/examples/repl.rs
@@ -0,0 +1,30 @@
+//! This example shows a simple read-evaluate-print-loop (REPL).
+
+extern crate rlua;
+
+use rlua::*;
+use std::io::prelude::*;
+use std::io::{stdin, stdout, stderr, BufReader};
+
+fn main() {
+    let lua = Lua::new();
+    let mut stdout = stdout();
+    let mut stdin = BufReader::new(stdin());
+
+    loop {
+        write!(stdout, "> ").unwrap();
+        stdout.flush().unwrap();
+
+        let mut line = String::new();
+        stdin.read_line(&mut line).unwrap();
+
+        match lua.eval::<LuaMultiValue>(&line) {
+            Ok(values) => {
+                println!("{}", values.iter().map(|value| format!("{:?}", value)).collect::<Vec<_>>().join("\t"));
+            }
+            Err(e) => {
+                writeln!(stderr(), "error: {}", e).unwrap();
+            }
+        }
+    }
+}

From 2cddfecfb2db291836c61d28a20130d923732768 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sat, 17 Jun 2017 01:53:51 +0200
Subject: [PATCH 2/3] Enable `io.popen` on Linux

---
 build.rs | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/build.rs b/build.rs
index 1dec803..fd4f1d2 100644
--- a/build.rs
+++ b/build.rs
@@ -1,8 +1,17 @@
 extern crate gcc;
 
+use std::env;
+
 fn main() {
-    gcc::Config::new()
-        .define("LUA_USE_APICHECK", None)
+    let mut config = gcc::Config::new();
+
+    if env::var("CARGO_CFG_TARGET_OS") == Ok("linux".to_string()) {
+        // Among other things, this enables `io.popen` support.
+        // Despite the name, we could enable this on more platforms.
+        config.define("LUA_USE_LINUX", None);
+    }
+
+    config.define("LUA_USE_APICHECK", None)
         .include("lua")
         .file("lua/lapi.c")
         .file("lua/lauxlib.c")

From 4a980de0edebb8de93531d0af9bc286c73053313 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sat, 17 Jun 2017 14:43:05 +0200
Subject: [PATCH 3/3] Allow multiline input in the REPL example

---
 examples/repl.rs | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/examples/repl.rs b/examples/repl.rs
index 6691f0b..17b9e3a 100644
--- a/examples/repl.rs
+++ b/examples/repl.rs
@@ -16,14 +16,24 @@ fn main() {
         stdout.flush().unwrap();
 
         let mut line = String::new();
-        stdin.read_line(&mut line).unwrap();
 
-        match lua.eval::<LuaMultiValue>(&line) {
-            Ok(values) => {
-                println!("{}", values.iter().map(|value| format!("{:?}", value)).collect::<Vec<_>>().join("\t"));
-            }
-            Err(e) => {
-                writeln!(stderr(), "error: {}", e).unwrap();
+        loop {
+            stdin.read_line(&mut line).unwrap();
+
+            match lua.eval::<LuaMultiValue>(&line) {
+                Ok(values) => {
+                    println!("{}", values.iter().map(|value| format!("{:?}", value)).collect::<Vec<_>>().join("\t"));
+                    break;
+                }
+                Err(LuaError(LuaErrorKind::IncompleteStatement(_), _)) => {
+                    // continue reading input and append it to `line`
+                    write!(stdout, ">> ").unwrap();
+                    stdout.flush().unwrap();
+                }
+                Err(e) => {
+                    writeln!(stderr(), "error: {}", e).unwrap();
+                    break;
+                }
             }
         }
     }