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use crate::{make, session::SessionInfo, utils, Metadata, Report, Rule, Suggestion};
use if_chain::if_chain;
use macros::lint;
use rnix::{
types::{Inherit, TypedNode},
NodeOrToken, SyntaxElement, SyntaxKind,
};
/// ## What it does
/// Checks for empty inherit statements.
///
/// ## Why is this bad?
/// Useless code, probably the result of a refactor.
///
/// ## Example
///
/// ```nix
/// inherit;
/// ```
///
/// Remove it altogether.
#[lint(
name = "empty_inherit",
note = "Found empty inherit statement",
code = 14,
match_with = SyntaxKind::NODE_INHERIT
)]
struct EmptyInherit;
impl Rule for EmptyInherit {
fn validate(&self, node: &SyntaxElement, _sess: &SessionInfo) -> Option<Report> {
if_chain! {
if let NodeOrToken::Node(node) = node;
if let Some(inherit_stmt) = Inherit::cast(node.clone());
if inherit_stmt.from().is_none();
if inherit_stmt.idents().count() == 0;
then {
let at = node.text_range();
let replacement = make::empty().node().clone();
let replacement_at = utils::with_preceeding_whitespace(node);
let message = "Remove this empty `inherit` statement";
Some(
self
.report()
.suggest(at, message, Suggestion::new(replacement_at, replacement))
)
} else {
None
}
}
}
}
|
