remove functionality

core/src/main/groovy/com/muwire/core/search/SearchIndex.groovy

@@ -6,8 +6,7 @@ class SearchIndex {
 	final Map<String, Set<String>> keywords = new HashMap<>()
 	
 	void add(String string) {
-		String name = string.replaceAll("\\."," ")
-		String [] split = name.split(" ")
+		String [] split = split(string)
 		split.each {
 			Set<String> existing = keywords.get(it)
 			if (existing == null) {
@@ -18,6 +17,24 @@ class SearchIndex {
 		}
 	}
 	
+	void remove(String string) {
+		String [] split = split(string)
+		split.each {
+			Set<String> existing = keywords.get it
+			if (existing != null) {
+				existing.remove(string)
+				if (existing.isEmpty()) {
+					keywords.remove(it)
+				}
+			}
+		}
+	}
+	
+	private static String[] split(String source) {
+		source = source.replaceAll("[\\.,_-]", " ")
+		source.split(" ")
+	}
+	
 	String[] search(List<String> terms) {
 		Set<String> rv = null;
 		

core/src/test/groovy/com/muwire/core/search/SearchIndexTest.groovy

@@ -55,4 +55,21 @@ class SearchIndexTest {
 		assert found.size() == 0
 		
 	}
+	
+	@Test
+	void testRemove() {
+		initIndex(["a b.c"])
+		index.remove("a b.c")
+		def found = index.search(["a"])
+		assert found.size() == 0
+	}
+	
+	@Test
+	void testRemoveOverlap() {
+		initIndex(["a b.c", "b c.d"])
+		index.remove("a b.c")
+		def found = index.search(["b"])
+		assert found.size() == 1
+		assert found.contains("b c.d")
+	}
 }