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use crate::{
make,
session::{SessionInfo, Version},
Metadata, Report, Rule, Suggestion,
};
use if_chain::if_chain;
use macros::lint;
use rnix::{
types::{Select, TypedNode},
NodeOrToken, SyntaxElement, SyntaxKind,
};
/// ## What it does
/// Checks for `lib.zipAttrsWith`.
///
/// ## Why is this bad?
/// Nix 2.6 introduces `builtins.zipAttrsWith` which is faster and does
/// not require a lib import.
///
/// ## Example
///
/// ```nix
/// lib.zipAttrsWith (name: values: values) [ {a = "x";} {a = "y"; b = "z";} ]
/// # { a = ["x" "y"]; b = ["z"] }
/// ```
///
/// Replace `lib.zipAttrsWith` with `builtins.zipAttrsWith`:
///
/// ```nix
/// builtins.zipAttrsWith (name: values: values) [ {a = "x";} {a = "y"; b = "z";} ]
/// ```
#[lint(
name = "faster_zipattrswith",
note = "Found lib.zipAttrsWith",
code = 16,
match_with = SyntaxKind::NODE_SELECT
)]
struct FasterZipAttrsWith;
impl Rule for FasterZipAttrsWith {
fn validate(&self, node: &SyntaxElement, sess: &SessionInfo) -> Option<Report> {
let lint_version = "2.6".parse::<Version>().unwrap();
if_chain! {
if sess.version() >= &lint_version;
if let NodeOrToken::Node(node) = node;
if let Some(select_expr) = Select::cast(node.clone());
if let Some(select_from) = select_expr.set();
if let Some(zip_attrs_with) = select_expr.index();
// a heuristic to lint on nixpkgs.lib.zipAttrsWith
// and lib.zipAttrsWith and its variants
if select_from.text().to_string() != "builtins";
if zip_attrs_with.text().to_string() == "zipAttrsWith";
then {
let at = node.text_range();
let replacement = {
let builtins = make::ident("builtins");
make::select(builtins.node(), &zip_attrs_with).node().clone()
};
let message = format!("Prefer `builtins.zipAttrsWith` over `{}.zipAttrsWith`", select_from);
Some(
self.report()
.suggest(at, message, Suggestion::new(at, replacement)),
)
} else {
None
}
}
}
}
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