From ddb8daa15a97a998c8cb99dbd716f2fd55ae1563 Mon Sep 17 00:00:00 2001
From: James Welford Anderson <james.w.anderson@gmail.com>
Date: Sun, 11 Jan 2015 06:44:56 +0900
Subject: [PATCH 1/2] add noclean parameter

deletes directory by default
---
 core/modules/commands/rendertiddlers.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/modules/commands/rendertiddlers.js b/core/modules/commands/rendertiddlers.js
index d3ec0a44a..d513688c5 100644
--- a/core/modules/commands/rendertiddlers.js
+++ b/core/modules/commands/rendertiddlers.js
@@ -38,8 +38,11 @@ Command.prototype.execute = function() {
 		pathname = path.resolve(this.commander.outputPath,this.params[2]),
 		type = this.params[3] || "text/html",
 		extension = this.params[4] || ".html",
+		deletedirectory = (this.params[5] || "") != "noclean",
 		tiddlers = wiki.filterTiddlers(filter);
-	$tw.utils.deleteDirectory(pathname);
+	if(deletedirectory){
+		$tw.utils.deleteDirectory(pathname);
+	}
 	$tw.utils.createDirectory(pathname);
 	$tw.utils.each(tiddlers,function(title) {
 		var parser = wiki.parseTiddler(template),

From e87dadd61d39f057199c342c9cd08b67f83abc1f Mon Sep 17 00:00:00 2001
From: James Welford Anderson <james.w.anderson@gmail.com>
Date: Mon, 12 Jan 2015 02:55:42 +0900
Subject: [PATCH 2/2] update docs change var name

---
 core/language/en-GB/Help/rendertiddlers.tid | 4 ++--
 core/modules/commands/rendertiddlers.js     | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/core/language/en-GB/Help/rendertiddlers.tid b/core/language/en-GB/Help/rendertiddlers.tid
index 158872f23..cb982efb3 100644
--- a/core/language/en-GB/Help/rendertiddlers.tid
+++ b/core/language/en-GB/Help/rendertiddlers.tid
@@ -4,7 +4,7 @@ description: Render tiddlers matching a filter to a specified ContentType
 Render a set of tiddlers matching a filter to separate files of a specified ContentType (defaults to `text/html`) and extension (defaults to `.html`).
 
 ```
---rendertiddlers <filter> <template> <pathname> [<type>] [<extension>]
+--rendertiddlers <filter> <template> <pathname> [<type>] [<extension>] ["noclean"]
 ```
 
 For example:
@@ -15,4 +15,4 @@ For example:
 
 By default, the pathname is resolved relative to the `output` subdirectory of the edition directory. The `--output` command can be used to direct output to a different directory.
 
-Any files in the target directory are deleted. The target directory is recursively created if it is missing.
+Any files in the target directory are deleted unless the "noclean" parameter is specified. The target directory is recursively created if it is missing.
diff --git a/core/modules/commands/rendertiddlers.js b/core/modules/commands/rendertiddlers.js
index d513688c5..d02d98417 100644
--- a/core/modules/commands/rendertiddlers.js
+++ b/core/modules/commands/rendertiddlers.js
@@ -38,9 +38,9 @@ Command.prototype.execute = function() {
 		pathname = path.resolve(this.commander.outputPath,this.params[2]),
 		type = this.params[3] || "text/html",
 		extension = this.params[4] || ".html",
-		deletedirectory = (this.params[5] || "") != "noclean",
+		deleteDirectory = (this.params[5] || "") != "noclean",
 		tiddlers = wiki.filterTiddlers(filter);
-	if(deletedirectory){
+	if(deleteDirectory){
 		$tw.utils.deleteDirectory(pathname);
 	}
 	$tw.utils.createDirectory(pathname);