From 58774c366dd33932ff1aaa635b5de6bb51896850 Mon Sep 17 00:00:00 2001
From: Dave C-J <dave@conway-jones.co.uk>
Date: Thu, 20 Feb 2014 21:00:54 +0000
Subject: [PATCH] Add .delete property to File output node Fix to close #162

---
 nodes/core/storage/50-file.html | 11 ++++----
 nodes/core/storage/50-file.js   | 49 +++++++++++++++++++--------------
 2 files changed, 34 insertions(+), 26 deletions(-)

diff --git a/nodes/core/storage/50-file.html b/nodes/core/storage/50-file.html
index f68a8f50f..d1ba80fda 100644
--- a/nodes/core/storage/50-file.html
+++ b/nodes/core/storage/50-file.html
@@ -36,11 +36,12 @@
 </script>
 
 <script type="text/x-red" data-help-name="file">
-	<p>Writes <b>msg.payload</b> to the file specified, e.g. to create a log.</p>
-	<p>The filename can be overridden by the <code>filename</code> property 
-	of the incoming message.</p> 
-	<p>A newline is added to every message. But this can be turned off if required, for example, to allow binary files to be written.</p>
-	<p>The default behaviour is to append to the file. This can be changed to overwrite the file each time, for example if you want to output a "static" web page or report.</p>
+    <p>Writes <b>msg.payload</b> to the file specified, e.g. to create a log.</p>
+    <p>The filename can be overridden by the <code>.filename</code> property
+    of the incoming message.</p>
+    <p>A newline is added to every message. But this can be turned off if required, for example, to allow binary files to be written.</p>
+    <p>The default behaviour is to append to the file. This can be changed to overwrite the file each time, for example if you want to output a "static" web page or report.</p>
+    <p>If a <code>.delete</code> property exists then the file will be deleted instead.</p>
 </script>
 
 <script type="text/javascript">
diff --git a/nodes/core/storage/50-file.js b/nodes/core/storage/50-file.js
index 318fc4435..bbd3dcf6a 100644
--- a/nodes/core/storage/50-file.js
+++ b/nodes/core/storage/50-file.js
@@ -18,36 +18,43 @@ var RED = require(process.env.NODE_RED_HOME+"/red/red");
 var fs = require("fs");
 
 function FileNode(n) {
-	RED.nodes.createNode(this,n);
+    RED.nodes.createNode(this,n);
 
-	this.filename = n.filename;
-	this.appendNewline = n.appendNewline;
-	this.overwriteFile = n.overwriteFile;
-	var node = this;
-	this.on("input",function(msg) {
-	    var filename = msg.filename || this.filename;
-	    
-	    if (filename == "") {
-	        node.warn('No filename specified');
-	    } else {
+    this.filename = n.filename;
+    this.appendNewline = n.appendNewline;
+    this.overwriteFile = n.overwriteFile;
+    var node = this;
+    this.on("input",function(msg) {
+        var filename = msg.filename || this.filename;
+
+        if (filename == "") {
+            node.warn('No filename specified');
+        } else {
             var data = msg.payload;
             if (this.appendNewline) {
                 data += "\n";
             }
-            if (this.overwriteFile) {
-                fs.writeFile(filename, data, function (err) {
-                    if (err) node.warn('Failed to write to file : '+err);
-                    //console.log('Message written to file',this.filename);
+            if (msg.hasOwnProperty('delete')) {
+                fs.unlink(filename, function (err) {
+                    if (err) node.warn('Failed to delete file : '+err);
+                    //console.log('Deleted file",filename);
                 });
             }
             else {
-                fs.appendFile(filename, data, function (err) {
-                    if (err) node.warn('Failed to append to file : '+err);
-                    //console.log('Message appended to file',this.filename);
-                });
+                if (this.overwriteFile) {
+                    fs.writeFile(filename, data, function (err) {
+                        if (err) node.warn('Failed to write to file : '+err);
+                        //console.log('Message written to file',filename);
+                    });
+                }
+                else {
+                    fs.appendFile(filename, data, function (err) {
+                        if (err) node.warn('Failed to append to file : '+err);
+                        //console.log('Message appended to file',filename);
+                    });
+                }
             }
         }
-	});
+    });
 }
-
 RED.nodes.registerType("file",FileNode);