From 7cacb3c303eb857d3d0572a8c69570116d848d55 Mon Sep 17 00:00:00 2001
From: Song <35002409+jingangdidi@users.noreply.github.com>
Date: Tue, 2 Dec 2025 16:02:37 +0800
Subject: [PATCH 1/2] Update tail_file.rs: read from the ending not beginning

---
 src/tools/tail_file.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tools/tail_file.rs b/src/tools/tail_file.rs
index bc40e55..f5816d7 100644
--- a/src/tools/tail_file.rs
+++ b/src/tools/tail_file.rs
@@ -24,7 +24,7 @@ use crate::fs_service::FileSystemService;
 pub struct TailFile {
     /// The path of the file to get information for.
     pub path: String,
-    /// The number of lines to read from the beginning of the file.
+    /// The number of lines to read from the ending of the file.
     pub lines: u64,
 }
 

From 80aee1963c47c9b6b5c327ab15762c1a11e551e5 Mon Sep 17 00:00:00 2001
From: Song <35002409+jingangdidi@users.noreply.github.com>
Date: Tue, 2 Dec 2025 17:06:35 +0800
Subject: [PATCH 2/2] fix: `tail_file` return the first n lines, not last n
 lines

`newline_positions` is already in reverse order
---
 src/fs_service/io/read.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/fs_service/io/read.rs b/src/fs_service/io/read.rs
index 575d5b9..45616e2 100644
--- a/src/fs_service/io/read.rs
+++ b/src/fs_service/io/read.rs
@@ -116,7 +116,7 @@ impl FileSystemService {
         let start_pos = if line_count <= n {
             0 // Read from start if fewer than n lines
         } else {
-            *newline_positions.get(line_count - n).unwrap_or(&0) + 1
+            *newline_positions.get(n).unwrap_or(&0) + 1
         };
 
         // Read forward from start_pos