Describe the bug

The Nix C library does not respect NO_COLOR. Eval error messages contain ANSI escape sequences.terminal control sequences. Eval error messages are barely readable.

Steps To Reproduce

Create an eval error with the C API.

Expected behavior

Produce evaluations errors as plain text only.

Metadata

nix-env (Nix) 2.28.4

Additional context

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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