//! TOML lint source.

use std::fs;
use std::path::Path;

use anyhow::Context as _;
use lint_policy::cargo;

use crate::source::LintGroups;

/// Query a TOML file for the list of included lints, panicking on any error.
///
/// # Panics
/// If an error occurs while reading the file or parsing the content.
pub(crate) fn read_lints(filepath: &Path) -> cargo::Lints {
	#[expect(
		clippy::expect_used,
		reason = "errors here are not deisgned to be recoverable"
	)]
	private_read_lints(filepath)
		.with_context(|| format!("reading lints from {}", filepath.display()))
		.expect("toml source error")
}

/// Query a TOML file for the list of included lints.
///
/// # Errors
/// IO can fail while reading the file, and TOML parsing can fail.
fn private_read_lints(filepath: &Path) -> anyhow::Result<cargo::Lints> {
	let contents = fs::read_to_string(filepath)?;
	let manifest: cargo::Manifest = toml::from_str(&contents)?;
	Ok(manifest.workspace.lints)
}

/// Query a TOML file for the list of included groups.
///
/// There is currently no differentiator between lints and groups so this function
/// just returns [Default].
pub(crate) fn read_groups(_: &Path) -> LintGroups {
	LintGroups::default()
}