From 30264bbc1998ab6640afdc31c348ca6167ca6191 Mon Sep 17 00:00:00 2001
From: Benoit Giannangeli <giann008@gmail.com>
Date: Fri, 28 Apr 2017 15:57:31 +0200
Subject: os.execute

---
 README.md      |  3 +--
 src/lauxlib.js | 23 ++++++++++++++++++++---
 src/loslib.js  | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 54 insertions(+), 5 deletions(-)

diff --git a/README.md b/README.md
index a92dd46..c14ff90 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@
     - [x] utf8
     - [ ] Package
     - [ ] os
+        - [x] `os.execute()`
         - [x] `os.exit()`
         - [x] `os.getenv()`
         - [x] `os.remove()`
@@ -33,7 +34,6 @@
         - [ ] `os.clock()`
         - [ ] `os.date()`
         - [ ] `os.difftime()`
-        - [ ] `os.execute()`
         - [ ] `os.setlocale()`
     - [ ] io
         - [ ] `io.stdin`
@@ -75,7 +75,6 @@
     - [ ] luaL_checkversion
     - [ ] luaL_dofile
     - [ ] luaL_dostring
-    - [ ] luaL_execresult
     - [ ] luaL_gsub
     - [ ] luaL_newlibtable
     - [ ] luaL_optnumber
diff --git a/src/lauxlib.js b/src/lauxlib.js
index bb2cd00..68e7c12 100644
--- a/src/lauxlib.js
+++ b/src/lauxlib.js
@@ -200,8 +200,7 @@ const luaL_fileresult = function(L, stat, fname, e) {
     if (stat) {
         lua.lua_pushboolean(L, 1);
         return 1;
-    }
-    else {
+    } else {
         lua.lua_pushnil(L);
         if (fname)
             lua.lua_pushstring(L, lua.to_luastring(`${lua.to_jsstring(fname)}: ${e.message}`));
@@ -212,6 +211,23 @@ const luaL_fileresult = function(L, stat, fname, e) {
     }
 };
 
+/* Unlike normal lua, we pass in an error object */
+const luaL_execresult = function(L, stat, e) {
+    let what = lua.to_luastring("exit");  /* type of termination */
+    if (e && e.status === -1)  /* error? */
+        return luaL_fileresult(L, 0, null, e);
+    else {
+        if (e && e.signal) {
+            lua.lua_pushnil(L);
+            lua.lua_pushliteral(L, "signal");
+        } else {
+            lua.lua_pushboolean(L, 1);
+            lua.lua_pushliteral(L, "exit");
+        }
+        lua.lua_pushinteger(L, e ? e.status : 0);
+        return 3;
+    }
+};
 
 const luaL_getmetatable = function(L, n) {
     return lua.lua_getfield(L, lua.LUA_REGISTRYINDEX, n);
@@ -693,8 +709,8 @@ const lua_writestringerror = function(s) {
     else console.error(s);
 };
 
-module.exports.LUA_LOADED_TABLE     = LUA_LOADED_TABLE;
 module.exports.LUA_FILEHANDLE       = LUA_FILEHANDLE;
+module.exports.LUA_LOADED_TABLE     = LUA_LOADED_TABLE;
 module.exports.luaL_Buffer          = luaL_Buffer;
 module.exports.luaL_addchar         = luaL_addchar;
 module.exports.luaL_addlstring      = luaL_addlstring;
@@ -714,6 +730,7 @@ module.exports.luaL_checkstring     = luaL_checkstring;
 module.exports.luaL_checktype       = luaL_checktype;
 module.exports.luaL_checkudata      = luaL_checkudata;
 module.exports.luaL_error           = luaL_error;
+module.exports.luaL_execresult      = luaL_execresult;
 module.exports.luaL_fileresult      = luaL_fileresult;
 module.exports.luaL_getmetafield    = luaL_getmetafield;
 module.exports.luaL_getmetatable    = luaL_getmetatable;
diff --git a/src/loslib.js b/src/loslib.js
index 1cc7d84..cb82bc3 100644
--- a/src/loslib.js
+++ b/src/loslib.js
@@ -95,9 +95,11 @@ if (typeof require === "function") {
 
     let fs = false;
     let tmp = false;
+    let child_process = false;
     try {
         fs = require('fs');
         tmp = require('tmp');
+        child_process = require('child_process');
     } catch (e) {}
 
     if (fs && tmp) {
@@ -144,6 +146,37 @@ if (typeof require === "function") {
         syslib.tmpname = os_tmpname;
     }
 
+    if (child_process) {
+        const os_execute = function(L) {
+            let cmd = lauxlib.luaL_optstring(L, 1, null);
+            let out = false;
+            if (cmd !== null) {
+                try {
+                    out = child_process.execSync(lua.to_jsstring(cmd));
+                } catch (e) {
+                    return lauxlib.luaL_execresult(L, false, e);
+                }
+
+                // if (out) console.log(out);
+
+                return lauxlib.luaL_execresult(L, true);
+            } else {
+                try {
+                    out = child_process.execSync(lua.to_jsstring(cmd));
+                    lua.lua_pushboolean(L, 1);
+                } catch (e) {
+                    lua.lua_pushboolean(L, 0);
+                }
+
+                // if (out) console.log(out);
+
+                return 1;
+            }
+        };
+
+        syslib.execute = os_execute;
+    }
+
 }
 
 const luaopen_os = function(L) {
-- 
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