Add warning emoji ⚠️

[nirs]

This is a very old emoji supported since Unicode 4.0.
https://www.compart.com/en/unicode/U+26A0

We can use it for stale status, and maybe for warnings in the console, instead of error. We can keep the error status of the conclusion line.

The following info provided by Cursor/Claude Opus 4.5.

Overview

Property	Value
Character	⚠️
Unicode	U+26A0
Name	WARNING SIGN
Added	Unicode 4.0 (2003)
Emoji Version	1.0 (2015)
Category	Symbols

Platform Support

Browsers

Browser	Supported	Notes
Chrome	✅ Yes	Since ~2010
Firefox	✅ Yes	Since ~2010
Safari	✅ Yes	Since ~2010
Edge	✅ Yes	All versions
Opera	✅ Yes	Since ~2010

Operating Systems

OS	Supported	Since
macOS	✅ Yes	10.7 Lion (2011)
Windows	✅ Yes	Windows 8 (2012), better in 10+
Linux	✅ Yes	With proper fonts (Noto, Symbola)
iOS	✅ Yes	iOS 5 (2011)
Android	✅ Yes	Android 4.3 (2013)

Terminals

Terminal	Supported	Notes
iTerm2 (macOS)	✅ Yes	Full color emoji
Terminal.app (macOS)	✅ Yes	Full color emoji
Windows Terminal	✅ Yes	Full color emoji
GNOME Terminal	✅ Yes	Requires emoji font
Konsole (KDE)	✅ Yes	Requires emoji font
xterm	⚠️ Limited	Depends on font, often monochrome
PuTTY	❌ No	Shows placeholder
SSH sessions	⚠️ Varies	Depends on client terminal

Terminal requirements:

• UTF-8 locale (LANG=en_US.UTF-8 or similar)
• Font with emoji glyphs (Noto Color Emoji, Apple Color Emoji, Segoe UI Emoji)
• Terminal emulator with emoji rendering support

Code Hosting / Documentation

Platform	Supported
GitHub	✅ Yes
GitLab	✅ Yes
Bitbucket	✅ Yes
Notion	✅ Yes
Confluence	✅ Yes
VS Code	✅ Yes
JetBrains IDEs	✅ Yes

Email Clients

Client	Supported
Gmail	✅ Yes
Apple Mail	✅ Yes
Outlook	✅ Yes (web/modern), ⚠️ varies (old desktop)
Thunderbird	✅ Yes

Recommendations

Use ⚠️ when:

• Writing markdown for web viewing (GitHub, docs sites)
• Creating documentation viewed in modern editors
• Writing content for browsers
• CLI tools targeting modern users (DevOps, developers, Kubernetes ecosystem)

Many popular CLI tools use emojis: npm, yarn, pnpm, brew, cargo-based tools.

Consider text alternatives when:

• Structured output meant for parsing (JSON, YAML, CSV) - but emojis
  shouldn't be in structured data anyway
• Logs will be viewed in basic text editors
• Targeting legacy systems (RHEL 6, ancient terminals)
• Users might SSH from Windows with PuTTY

Note: Progress/status messages for human consumption are fine with emojis.
The parsing concern only applies to structured data output, which should be
separate from human-readable messages anyway.

Optional: Environment detection

Some tools detect terminal capabilities and fall back:

import sys
import os

def warning_prefix():
    # Check if output is a TTY and likely supports emoji
    if sys.stderr.isatty() and os.environ.get("TERM") != "dumb":
        return "⚠️ "
    return "WARNING: "

Text alternatives:

• WARNING:
• [WARNING]
• **Warning:** (for markdown output)

References

• Unicode Chart for Miscellaneous Symbols
• Emojipedia: Warning
• Can I Emoji