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use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::declare_lint_pass;
use rustc_span::sym;
declare_clippy_lint! {
/// ### What it does
/// Checks usage of `std::fs::create_dir` and suggest using `std::fs::create_dir_all` instead.
///
/// ### Why is this bad?
/// Sometimes `std::fs::create_dir` is mistakenly chosen over `std::fs::create_dir_all`.
///
/// ### Example
/// ```rust,ignore
/// std::fs::create_dir("foo");
/// ```
///
/// Use instead:
/// ```rust,ignore
/// std::fs::create_dir_all("foo");
/// ```
#[clippy::version = "1.48.0"]
pub CREATE_DIR,
restriction,
"calling `std::fs::create_dir` instead of `std::fs::create_dir_all`"
}
declare_lint_pass!(CreateDir => [CREATE_DIR]);
impl LateLintPass<'_> for CreateDir {
fn check_expr(&mut self, cx: &LateContext<'_>, expr: &Expr<'_>) {
if let ExprKind::Call(func, [arg, ..]) = expr.kind
&& let ExprKind::Path(ref path) = func.kind
&& let Some(def_id) = cx.qpath_res(path, func.hir_id).opt_def_id()
&& cx.tcx.is_diagnostic_item(sym::fs_create_dir, def_id)
{
span_lint_and_sugg(
cx,
CREATE_DIR,
expr.span,
"calling `std::fs::create_dir` where there may be a better way",
"consider calling `std::fs::create_dir_all` instead",
format!("create_dir_all({})", snippet(cx, arg.span, "..")),
Applicability::MaybeIncorrect,
);
}
}
}
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