From 5525f63f02352a3347911d0d179657983ea5171a Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Thu, 27 Apr 2017 03:02:41 +1000
Subject: src/liolib: Add file:write()

---
 README.md     |  2 +-
 src/liolib.js | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 804136a..d62d8d4 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@
         - [ ] `file:read()`
         - [ ] `file:read()`
         - [ ] `file:setvbuf()`
-        - [ ] `file:write()`
+        - [x] `file:write()`
         - [ ] `file:__gc()`
         - [x] `file:__tostring()`
 - [ ] C API
diff --git a/src/liolib.js b/src/liolib.js
index f581323..9940583 100644
--- a/src/liolib.js
+++ b/src/liolib.js
@@ -1,5 +1,6 @@
 "use strict";
 
+const assert  = require('assert');
 const fs      = require('fs');
 
 const lua     = require('./lua.js');
@@ -27,6 +28,14 @@ const f_tostring = function(L) {
     return 1;
 };
 
+const tofile = function(L) {
+    let p = tolstream(L);
+    if (isclosed(p))
+        lauxlib.luaL_error(L, "attempt to use a closed file");
+    assert(p.f);
+    return p.f;
+};
+
 const newprefile = function(L) {
     let p = lua.lua_newuserdata(L);
     p.f = null;
@@ -64,11 +73,18 @@ const io_write = function(L) {
     return g_write(L, getiofile(L, IO_OUTPUT), 1);
 };
 
+const f_write = function(L) {
+    let f = tofile(L);
+    lua.lua_pushvalue(L, 1); /* push file at the stack top (to be returned) */
+    return g_write(L, f, 2);
+};
+
 const iolib = {
     "write": io_write
 };
 
 const flib = {
+    "write": f_write,
     "__tostring": f_tostring
 };
 
-- 
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