[pri5h]

Summary

• Handle EOF cleanly in chat mode.
• Prevent unexpected errors when the input stream reaches EOF.
• Add tests covering EOF handling in chat mode.

Related issue

Closes #1214

Testing

• Run the relevant chat tests.
• Confirm the changes pass the test suite.

[connabyss]

Tested on Windows 11 (Python 3.11.6) with llm-echo, using Ctrl+Z then Enter to send EOF:

• main: prints Aborted!, as described.

• this PR, click 8.5.0: exits cleanly. 👍

• this PR, click 8.3.1: crashes as soon as chat starts, before any input:

  File "...\llm\cli.py", line 171, in _run_chat
    prompt = click.termui._readline_prompt(
  AttributeError: module 'click.termui' has no attribute '_readline_prompt'
  

click.termui._readline_prompt is a private helper that first appears in click 8.4.0 (it's not in 8.3.1, 8.3.0, 8.2.1 or 8.1.8). llm's runtime dependency is plain "click" (only the dev group pins >=8.2.0), so anyone with an older click already installed would lose llm chat entirely. Either pinning click>=8.4 in dependencies or avoiding the private helper (for example, calling input() and catching EOFError yourself) would cover it.