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filesystem: read_text_file head/tail mishandle line endings (tail drops a line after a final newline; head keeps \r on CRLF)

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难度
3/5
预计耗时
1-2 天
新手友好度
78/100
Issue 类型
缺陷
描述清晰度
描述清楚
活跃度
活跃
技术栈
typescript
领域
backend

调研方向

Start with tailFile in src/filesystem/lib.ts and the trailing newline test in src/filesystem/__tests__/server-tools.test.ts; trace how the decoded tail is split, including LF, CRLF, and the chunk boundary. Update the test to capture the expected behavior, then verify tail: 1 and tail: 2 return the final lines without counting a trailing newline as an extra line.

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描述

bug server-filesystem v2
Problem

tailFile in src/filesystem/lib.ts splits the decoded tail on \n and keeps the last N segments. For a file that ends with a newline, the empty segment after the final \n counts as one of the N lines: tail: 1 on "a\nb\nc\n" returns an empty string, and tail: 2 returns only c. The test in src/filesystem/__tests__/server-tools.test.ts that counts the trailing newline as a line pins this today. head does not have the problem.

Expected

A final newline ends the last line and is not counted as an extra empty line, for LF and CRLF files and across the chunk boundary tailFile reads in. The pinning test changes with the fix.

Prior work
  • #4674 by @jstar0
  • #4643 by @teddiesloco

The PR(s) above targeted the pre-refactor code and are closed as part of the backlog triage in #4875; this issue is where the work continues, with the PR(s) as a prototype. Thank you to their authors.

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TypeScript
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  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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