Status line leaves ─ artifacts in terminal after Ctrl+C exit

[AmethystLiang]

Description

When exiting Claude Code with Ctrl+C, the ccline status line's box-drawing characters (─) are left behind in the terminal output, creating a visual artifact on the prompt line.

Steps to reproduce

1. Configure ccline as Claude Code's status line in ~/.claude/settings.json:

   "statusLine": {
       "type": "command",
       "command": "/path/to/ccline",
       "padding": 0
   }

2. Start a Claude Code session
3. Press Ctrl+C to cancel/exit

Expected behavior

Terminal returns to a clean prompt with no leftover characters.

Actual behavior

The prompt line shows ^C followed by a long line of ─ characters extending to the terminal edge:

$ ^C────────────────────────────────────────
$

Environment

• ccline v1.1.2
• macOS (Darwin, arm64)
• Bash shell
• iTerm2 terminal

Analysis

It appears that when Claude Code's process receives SIGINT, ccline doesn't get a chance to clear its rendered status line from the terminal. The ─ fill characters that normally form the status bar background get dumped into the visible terminal output.

A possible fix would be to install a SIGINT/SIGTERM handler in ccline that writes the appropriate terminal escape sequences (e.g., \033[2K\r to clear the line) before exiting.

[Haleclipse]

A possible fix would be to install a SIGINT/SIGTERM handler in ccline that writes the appropriate terminal escape sequences (e.g., \033[2K\r to clear the line) before exiting.

In fact, we cannot do this.
We should wait for ClaudeCode to fix it.

I’ll try to analyze and fix the issue with this ClaudeCode.