From cf75b209bac8b1f5c13636d08e0a936ffeb41747 Mon Sep 17 00:00:00 2001
From: Jeremy Ruston <jeremy@osmosoft.com>
Date: Mon, 27 May 2013 17:59:33 +0100
Subject: [PATCH] Add `eachday` and `sameday` filter operators

These operators will enable us to group the recent changes list by day
---
 core/modules/filters/eachday.js | 42 ++++++++++++++++++++++++++++++
 core/modules/filters/sameday.js | 46 +++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 core/modules/filters/eachday.js
 create mode 100644 core/modules/filters/sameday.js

diff --git a/core/modules/filters/eachday.js b/core/modules/filters/eachday.js
new file mode 100644
index 000000000..dae0f26af
--- /dev/null
+++ b/core/modules/filters/eachday.js
@@ -0,0 +1,42 @@
+/*\
+title: $:/core/modules/filters/eachday.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator that selects one tiddler for each unique day covered by the specified date field
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.eachday = function(source,operator,options) {
+	// Convert the source to an array if necessary
+	if(!$tw.utils.isArray(source)) {
+		var copy = [];
+		$tw.utils.each(source,function(element,title) {
+			copy.push(title);
+		});
+		source = copy;
+	}
+	// Collect up the first tiddler with each unique day value of the specified field
+	var results = [],values = {};
+	$tw.utils.each(source,function(title) {
+		var tiddler = options.wiki.getTiddler(title);
+		if(tiddler) {
+			var value = tiddler.getFieldString(operator.operand).substr(0,8);
+			if(!$tw.utils.hop(values,value)) {
+				values[value] = true;
+				results.push(title);
+			}
+		}
+	});
+	return results;
+};
+
+})();
diff --git a/core/modules/filters/sameday.js b/core/modules/filters/sameday.js
new file mode 100644
index 000000000..6fdb2d30c
--- /dev/null
+++ b/core/modules/filters/sameday.js
@@ -0,0 +1,46 @@
+/*\
+title: $:/core/modules/filters/sameday.js
+type: application/javascript
+module-type: filteroperator
+
+Filter operator that selects tiddlers with a modified date field on the same day as the provided value.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports.sameday = function(source,operator,options) {
+	var results = [];
+	// Function to check an individual title
+	function checkTiddler(title) {
+		var tiddler = options.wiki.getTiddler(title);
+		if(tiddler) {
+			var match = tiddler.getFieldString("modified").substr(0,8) === operator.operand.substr(0,8);
+			if(operator.prefix === "!") {
+				match = !match;
+			}
+			if(match) {
+				results.push(title);
+			}
+		}
+	};
+	// Iterate through the source tiddlers
+	if($tw.utils.isArray(source)) {
+		$tw.utils.each(source,function(title) {
+			checkTiddler(title);
+		});
+	} else {
+		$tw.utils.each(source,function(element,title) {
+			checkTiddler(title);
+		});
+	}
+	return results;
+};
+
+})();