From 7c6f5dba63a4cf54a785090c26479003118f0046 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Sat, 22 Apr 2023 15:06:22 +0900
Subject: Fixed --track when used with --tac

Fix #3234
---
 src/merger.go | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

(limited to 'src/merger.go')

diff --git a/src/merger.go b/src/merger.go
index cdf00acc..5c12575c 100644
--- a/src/merger.go
+++ b/src/merger.go
@@ -60,17 +60,30 @@ func (mg *Merger) Length() int {
 	return mg.count
 }
 
+func (mg *Merger) First() Result {
+	if mg.tac && !mg.sorted {
+		return mg.Get(mg.count - 1)
+	}
+	return mg.Get(0)
+}
+
 // FindIndex returns the index of the item with the given item index
 func (mg *Merger) FindIndex(itemIndex int32) int {
+	index := -1
 	if mg.pass {
-		return int(itemIndex)
-	}
-	for i := 0; i < mg.count; i++ {
-		if mg.Get(i).item.Index() == itemIndex {
-			return i
+		index = int(itemIndex)
+		if mg.tac {
+			index = mg.count - index - 1
+		}
+	} else {
+		for i := 0; i < mg.count; i++ {
+			if mg.Get(i).item.Index() == itemIndex {
+				index = i
+				break
+			}
 		}
 	}
-	return -1
+	return index
 }
 
 // Get returns the pointer to the Result object indexed by the given integer
-- 
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