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// Copyright 2026 AlphaOne LLC
// SPDX-License-Identifier: Apache-2.0
//! ANSI color output for CLI — zero dependencies.
//!
//! pm-v3.1 PR8 (issue #1174) — color enablement is determined ONCE at
//! process boot from `std::io::stdout().is_terminal()` and frozen for
//! the lifetime of the process via `OnceLock<bool>`. The pre-PR8
//! shape used a mutable `AtomicBool` which gave production callers no
//! protection against accidental late mutation. Tests that need to
//! force colour off route through a thread-local override consulted
//! by `enabled()` (compiled out of non-test builds).
use std::io::IsTerminal;
use std::sync::OnceLock;
/// One-shot snapshot of the boot-time `stdout` is-a-terminal probe.
/// Set exactly once by [`init`]; subsequent calls are no-ops thanks
/// to `OnceLock::set` semantics (first-writer-wins). Production code
/// SHOULD call [`init`] exactly once at process start (see
/// `src/main.rs`).
static COLOR_ENABLED: OnceLock<bool> = OnceLock::new();
pub fn init() {
// `OnceLock::set` returns `Err` if already initialised; benign
// for double-init paths (tests, repeat embedder bootstrap), so
// the return value is intentionally discarded.
let _ = COLOR_ENABLED.set(std::io::stdout().is_terminal());
}
fn enabled() -> bool {
#[cfg(test)]
if let Some(forced) = test_override::get() {
return forced;
}
// Default true matches the pre-PR8 `AtomicBool::new(true)` posture
// — if production code reads colour state before `init` runs the
// colourised path stays on (the prior behaviour).
*COLOR_ENABLED.get().unwrap_or(&true)
}
#[cfg(test)]
mod test_override {
use std::cell::Cell;
thread_local! {
static OVERRIDE: Cell<Option<bool>> = const { Cell::new(None) };
}
pub(super) fn get() -> Option<bool> {
OVERRIDE.with(Cell::get)
}
pub(super) fn set(value: Option<bool>) {
OVERRIDE.with(|cell| cell.set(value));
}
}
fn wrap(code: &str, text: &str) -> String {
if enabled() {
format!("\x1b[{code}m{text}\x1b[0m")
} else {
text.to_string()
}
}
// Tier colors
pub fn short(text: &str) -> String {
wrap("91", text)
} // red
pub fn mid(text: &str) -> String {
wrap("93", text)
} // yellow
pub fn long(text: &str) -> String {
wrap("92", text)
} // green
// Semantic colors
pub fn dim(text: &str) -> String {
wrap("2", text)
}
pub fn bold(text: &str) -> String {
wrap("1", text)
}
pub fn cyan(text: &str) -> String {
wrap("96", text)
}
/// Colorize `text` according to the caller-supplied tier wire string.
///
/// The string literals in the match arms below are the **canonical
/// deserializer** for the `Tier` enum's wire form — they pair with
/// `crate::models::Tier::as_str` (Short → "short" / Mid → "mid" /
/// Long → "long"). They MUST stay as raw literals here because this
/// is the boundary where a caller-supplied `&str` (config, CLI flag,
/// JSON value) gets dispatched; the enum has nothing to plug in at
/// this point. Anywhere else that constructs a tier wire value should
/// route through `Tier::<X>.as_str()`. See pm-v3.1 PR6 (#1174) for the
/// sweep that pinned this invariant.
pub fn tier_color(tier: &str, text: &str) -> String {
match tier {
"short" => short(text),
"mid" => mid(text),
"long" => long(text),
_ => text.to_string(),
}
}
/// Priority as a colored bar: ████░░░░░░
pub fn priority_bar(p: i32) -> String {
// B4 (R2-LOW) — clamp range is 1..=10 so try_from is infallible;
// use `unwrap_or` to align with the campaign's no-panic discipline
// (defensive against future refactors that drop the `clamp` call).
let filled = usize::try_from(p.clamp(1, 10)).unwrap_or(1);
let empty = 10 - filled;
let bar = format!("{}{}", "█".repeat(filled), "░".repeat(empty));
if p >= 8 {
wrap("92", &bar)
} else if p >= 5 {
wrap("93", &bar)
} else {
wrap("91", &bar)
}
}
#[cfg(test)]
mod tests {
use super::*;
/// pm-v3.1 PR8 (issue #1174) — thread-local override removes the
/// need for a process-wide `Mutex<()>` to serialise tests. Each
/// `cargo test` worker gets its own override slot, so the
/// previously-required `--test-threads=1` style of serialisation
/// is gone.
fn with_color_off<F: FnOnce()>(f: F) {
test_override::set(Some(false));
f();
test_override::set(None);
}
#[test]
fn tier_colors_no_ansi() {
with_color_off(|| {
assert_eq!(short("test"), "test");
assert_eq!(mid("test"), "test");
assert_eq!(long("test"), "test");
});
}
#[test]
fn semantic_colors_no_ansi() {
with_color_off(|| {
assert_eq!(dim("test"), "test");
assert_eq!(bold("test"), "test");
assert_eq!(cyan("test"), "test");
});
}
#[test]
fn tier_color_dispatch() {
use crate::models::Tier;
with_color_off(|| {
assert_eq!(tier_color(Tier::Short.as_str(), "x"), "x");
assert_eq!(tier_color(Tier::Mid.as_str(), "x"), "x");
assert_eq!(tier_color(Tier::Long.as_str(), "x"), "x");
assert_eq!(tier_color("unknown", "x"), "x");
});
}
#[test]
fn priority_bar_length() {
with_color_off(|| {
let bar = priority_bar(5);
// 5 filled + 5 empty = 10 chars (each is multi-byte unicode)
assert!(bar.contains("█"));
assert!(bar.contains("░"));
});
}
#[test]
fn priority_bar_clamps() {
with_color_off(|| {
let bar_min = priority_bar(0); // clamps to 1
let bar_max = priority_bar(15); // clamps to 10
assert!(bar_min.contains("░"));
assert!(!bar_max.contains("░")); // all filled
});
}
#[test]
fn wrap_with_color_enabled() {
test_override::set(Some(true));
let result = wrap("91", "red");
assert!(result.contains("\x1b[91m"));
assert!(result.contains("\x1b[0m"));
assert!(result.contains("red"));
test_override::set(None);
}
}