Remove special nilItem

src/core.go

@@ -85,29 +85,30 @@ func Run(opts *Options, revision string) {
 	var chunkList *ChunkList
 	header := make([]string, 0, opts.HeaderLines)
 	if len(opts.WithNth) == 0 {
-		chunkList = NewChunkList(func(data []byte, index int) Item {
+		chunkList = NewChunkList(func(item *Item, data []byte, index int) bool {
 			if len(header) < opts.HeaderLines {
 				header = append(header, string(data))
 				eventBox.Set(EvtHeader, header)
-				return nilItem
+				return false
 			}
-			chars, colors := ansiProcessor(data)
-			chars.Index = int32(index)
-			return Item{text: chars, colors: colors}
+			item.text, item.colors = ansiProcessor(data)
+			item.text.Index = int32(index)
+			return true
 		})
 	} else {
-		chunkList = NewChunkList(func(data []byte, index int) Item {
+		chunkList = NewChunkList(func(item *Item, data []byte, index int) bool {
 			tokens := Tokenize(string(data), opts.Delimiter)
 			trans := Transform(tokens, opts.WithNth)
 			transformed := joinTokens(trans)
 			if len(header) < opts.HeaderLines {
 				header = append(header, transformed)
 				eventBox.Set(EvtHeader, header)
-				return nilItem
+				return false
 			}
-			trimmed, colors := ansiProcessor([]byte(transformed))
-			trimmed.Index = int32(index)
-			return Item{text: trimmed, colors: colors, origText: &data}
+			item.text, item.colors = ansiProcessor([]byte(transformed))
+			item.text.Index = int32(index)
+			item.origText = &data
+			return true
 		})
 	}
 
@@ -151,8 +152,8 @@ func Run(opts *Options, revision string) {
 			slab := util.MakeSlab(slab16Size, slab32Size)
 			reader := Reader{
 				func(runes []byte) bool {
-					item := chunkList.trans(runes, 0)
-					if !item.Nil() {
+					item := Item{}
+					if chunkList.trans(&item, runes, 0) {
 						if result, _, _ := pattern.MatchItem(&item, false, slab); result != nil {
 							opts.Printer(item.text.ToString())
 							found = true