enprot 0.5.17

Engyon Protected Text (EPT) — confidentiality processor and capability ledger
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// Copyright (c) 2018-2026 [Ribose Inc](https://www.ribose.com).
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//! Colored output for diagnostic subcommands (TODO.complete/73).
//!
//! Uses raw ANSI escape codes — no external dependency. Color is
//! auto-disabled when:
//! - `NO_COLOR` environment variable is set (https://no-color.org/)
//! - stderr is not a TTY (piped output shouldn't contain escape codes)

use std::io::IsTerminal;

const GREEN: &str = "\x1b[32m";
const RED: &str = "\x1b[31m";
const YELLOW: &str = "\x1b[33m";
const RESET: &str = "\x1b[0m";

/// True if colorized output should be used on stderr.
pub fn enabled() -> bool {
    if std::env::var_os("NO_COLOR").is_some() {
        return false;
    }
    std::io::stderr().is_terminal()
}

fn paint(prefix: &str, s: &str) -> String {
    if enabled() {
        format!("{prefix}{s}{RESET}")
    } else {
        s.to_string()
    }
}

pub fn green(s: &str) -> String {
    paint(GREEN, s)
}

pub fn red(s: &str) -> String {
    paint(RED, s)
}

pub fn yellow(s: &str) -> String {
    paint(YELLOW, s)
}