From 5d4b124a2fd10e3c156a5cf440a901cff13bfadf Mon Sep 17 00:00:00 2001
From: Benoit Giannangeli <giann008@gmail.com>
Date: Fri, 28 Apr 2017 15:29:41 +0200
Subject: os.getenv

---
 README.md       |  2 +-
 src/loslib.js   |  8 +++++++-
 tests/loslib.js | 31 +++++++++++++++++++++++++++++++
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 98874ec..a92dd46 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,7 @@
     - [ ] Package
     - [ ] os
         - [x] `os.exit()`
+        - [x] `os.getenv()`
         - [x] `os.remove()`
         - [x] `os.rename()`
         - [x] `os.time()`
@@ -33,7 +34,6 @@
         - [ ] `os.date()`
         - [ ] `os.difftime()`
         - [ ] `os.execute()`
-        - [ ] `os.getenv()`
         - [ ] `os.setlocale()`
     - [ ] io
         - [ ] `io.stdin`
diff --git a/src/loslib.js b/src/loslib.js
index aa868f5..1cc7d84 100644
--- a/src/loslib.js
+++ b/src/loslib.js
@@ -67,7 +67,7 @@ const syslib = {
 };
 
 // Only with Node
-if (process && process.exit) {
+if (process && process.exit && process.env) {
     const os_exit = function(L) {
         let status;
         if (lua.lua_isboolean(L, 1))
@@ -80,7 +80,13 @@ if (process && process.exit) {
         return 0;
     };
 
+    const os_getenv = function(L) {
+        lua.lua_pushliteral(L, process.env[lua.to_jsstring(lauxlib.luaL_checkstring(L, 1))]);  /* if NULL push nil */
+        return 1;
+    };
+
     syslib.exit = os_exit;
+    syslib.getenv = os_getenv;
 }
 
 
diff --git a/tests/loslib.js b/tests/loslib.js
index 968a338..c460919 100644
--- a/tests/loslib.js
+++ b/tests/loslib.js
@@ -34,3 +34,34 @@ test('os.time', function (t) {
     );
 
 });
+
+
+test('os.getenv', function (t) {
+    let luaCode = `
+        return os.getenv('HOME')
+    `, L;
+    
+    t.plan(3);
+
+    t.doesNotThrow(function () {
+
+        L = lauxlib.luaL_newstate();
+
+        lauxlib.luaL_openlibs(L);
+
+        lauxlib.luaL_loadstring(L, lua.to_luastring(luaCode));
+
+    }, "Lua program loaded without error");
+
+    t.doesNotThrow(function () {
+
+        lua.lua_call(L, 0, -1);
+
+    }, "Lua program ran without error");
+
+    t.ok(
+        lua.lua_isstring(L, -1),
+        "Correct element(s) on the stack"
+    );
+
+});
-- 
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