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feat: respect NO_COLOR env var and TERM=dumb (#4079)

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Add should_use_color() function to hermes_cli/colors.py that checks
NO_COLOR (https://no-color.org/) and TERM=dumb before emitting ANSI
escapes. The existing color() helper now uses this function instead
of a bare isatty() check.

This is the foundation — cli.py and banner.py still have inline ANSI
constants that bypass this module (tracked in #4071).

Closes #4066

Co-authored-by: SHL0MS <SHL0MS@users.noreply.github.com>
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SHL0MS 2026-03-30 17:07:21 -07:00 • committed by GitHub
parent 13f3e67165
commit 3c8f910973
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1 changed files with 18 additions and 2 deletions
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20
hermes_cli/colors.py
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@ -1,8 +1,24 @@
"""Shared ANSI color utilities for Hermes CLI modules."""
import os
import sys
def should_use_color() -> bool:
"""Return True when colored output is appropriate.
Respects the NO_COLOR environment variable (https://no-color.org/)
and TERM=dumb, in addition to the existing TTY check.
"""
if os.environ.get("NO_COLOR") is not None:
return False
if os.environ.get("TERM") == "dumb":
return False
if not sys.stdout.isatty():
return False
return True
class Colors:
RESET = "\033[0m"
BOLD = "\033[1m"
@ -16,7 +32,7 @@ class Colors:
def color(text: str, *codes) -> str:
"""Apply color codes to text (only when output is a TTY)."""
if not sys.stdout.isatty():
"""Apply color codes to text (only when color output is appropriate)."""
if not should_use_color():
return text
return "".join(codes) + text + Colors.RESET