Introduce an improved but temporary cache invalidation method for palettes

core/modules/filters/accumulate-palette-entries.js

@@ -0,0 +1,45 @@
+/*\
+title: $:/core/modules/filters/accumulate-palette-entries.js
+type: application/javascript
+module-type: filteroperator
+
+A temporary filter operator for accumulating palette entries into a unique signature that can be used for cache invalidation. The signature is opaque, and should not be used for anything other than cache invalidation.
+
+Hopefully we can figure out a way to do this within TW's filter language; it might be a good way to stretch the capabilities of the language.
+
+\*/
+(function(){
+
+/*jslint node: true, browser: true */
+/*global $tw: false */
+"use strict";
+
+/*
+Export our filter function
+*/
+exports["accumulate-palette-entries"] = function(source,operator,options) {
+	var paletteTitle = operator.operand,
+		wiki = options.wiki,
+		visitedPalettes = [];
+	// Recursive function to accumulate the palette entries from a single palette
+	function accumulatePaletteEntries(title) {
+		var tiddler = wiki.getTiddler(title),
+			results = [];
+		if(visitedPalettes.indexOf(title) === -1 && tiddler) {
+			visitedPalettes.push(title);
+			if(tiddler.fields["palette-import"]) {
+				Array.prototype.push.apply(results,accumulatePaletteEntries(tiddler.fields["palette-import"]));
+			}
+			var json = wiki.getTiddlerData(tiddler,{});
+			$tw.utils.each(Object.keys(json),function(key) {
+				results.push(key + ":" + json[key]);
+			});
+		}
+		return results;
+	}
+	var results = JSON.stringify(accumulatePaletteEntries(paletteTitle));
+	results += wiki.getTiddlerAsJson(paletteTitle);
+	return [results];
+};
+
+})();

core/wiki/background-actions/AutoCompilePalette.tid

@@ -1,6 +1,6 @@
 title: $:/core/background-actions/AutoCompilePalette
 tags: $:/tags/BackgroundAction $:/tags/StartupAction
-track-filter: [{$:/palette}indexes[]] :map[{$:/palette}getindex<currentTiddler>]
+track-filter: [accumulate-palette-entries[$:/palette]]
 
 \import [subfilter{$:/core/config/GlobalImportFilter}]
 <<actions-recompile-current-palette>>

editions/test/tiddlers/tests/data/palettes/Accumulate.tid

@@ -0,0 +1,40 @@
+
+title: Operators/Palettes/Accumulate
+description: Recursively accumulate palette definitions
+type: text/vnd.tiddlywiki-multiple
+tags: [[$:/tags/wiki-test-spec]]
+
+title: Output
+
+\import [subfilter{$:/core/config/GlobalImportFilter}]
+\parsermode inline
+<$text text={{{ [accumulate-palette-entries[MyPalette]] }}}/>
++
+title: $:/palette
+
+MyPalette
++
+title: MyPalette
+name: My Palette
+description: My custom palette
+tags: $:/tags/Palette
+type: application/x-tiddler-dictionary
+palette-import: MyOtherPalette
+color-scheme: light
+
+page-background: <<colour custom>>
+custom: #f4e4d4
++
+title: MyOtherPalette
+name: My Other Palette
+description: My other custom palette
+tags: $:/tags/Palette
+type: application/x-tiddler-dictionary
+color-scheme: light
+
+page-background: #d4e4f4
+background: red
++
+title: ExpectedResult
+
+["page-background:#d4e4f4","background:red","page-background:&lt;&lt;colour custom&gt;&gt;","custom:#f4e4d4"]{"title":"MyPalette","name":"My Palette","description":"My custom palette","tags":"$:/tags/Palette","type":"application/x-tiddler-dictionary","palette-import":"MyOtherPalette","color-scheme":"light","text":"page-background: &lt;&lt;colour custom&gt;&gt;\ncustom: #f4e4d4"}

editions/test/tiddlers/tests/data/palettes/BasicLookup.tid

@@ -1,6 +1,6 @@
 
 title: Operators/Palettes/BasicLookup
-description: Compute the 
+description: Basic palette lookups
 type: text/vnd.tiddlywiki-multiple
 tags: [[$:/tags/wiki-test-spec]]