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Add suggestion/fix to suspicious_open_options

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Also rebase and fix conflicts
This commit is contained in:
atwam 2023-10-26 11:30:12 +01:00
parent 2ec8729962
commit 84588a8815
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6 changed files with 89 additions and 70 deletions
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66
clippy_lints/src/methods/open_options.rs
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@ -2,23 +2,24 @@ use rustc_data_structures::fx::FxHashMap;
use clippy_utils::diagnostics::{span_lint, span_lint_and_then};
use clippy_utils::paths;
use clippy_utils::ty::is_type_diagnostic_item;
use clippy_utils::ty::{is_type_diagnostic_item, match_type};
use rustc_ast::ast::LitKind;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::LateContext;
use rustc_middle::ty::Ty;
use rustc_span::source_map::Spanned;
use rustc_span::{sym, Span};
use super::{NONSENSICAL_OPEN_OPTIONS, SUSPICIOUS_OPEN_OPTIONS};
fn is_open_options(cx: &LateContext<'_>, ty: Ty<'_>) -> bool {
is_type_diagnostic_item(cx, ty, sym::FsOpenOptions) || match_type(cx, ty, &paths::TOKIO_IO_OPEN_OPTIONS)
}
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, recv: &'tcx Expr<'_>) {
if let Some(method_id) = cx.typeck_results().type_dependent_def_id(e.hir_id)
&& let Some(impl_id) = cx.tcx.impl_of_method(method_id)
&& (
is_type_diagnostic_item(cx, cx.tcx.type_of(impl_id).instantiate_identity(), sym::FsOpenOptions) ||
match_type(cx, cx.tcx.type_of(impl_id).instantiate_identity(), &paths::TOKIO_IO_OPEN_OPTIONS)
)
&& is_open_options(cx, cx.tcx.type_of(impl_id).instantiate_identity())
{
let mut options = Vec::new();
get_open_options(cx, recv, &mut options);
@ -59,7 +60,7 @@ fn get_open_options(cx: &LateContext<'_>, argument: &Expr<'_>, options: &mut Vec
let obj_ty = cx.typeck_results().expr_ty(receiver).peel_refs();
// Only proceed if this is a call on some object of type std::fs::OpenOptions
if !arguments.is_empty() && (is_type_diagnostic_item(cx, obj_ty, sym::FsOpenOptions)) {
if !arguments.is_empty() && is_open_options(cx, obj_ty) {
let argument_option = match arguments[0].kind {
ExprKind::Lit(span) => {
if let Spanned {
@ -121,36 +122,39 @@ fn check_open_options(cx: &LateContext<'_>, settings: &[(OpenOption, Argument, S
if let Some((Argument::Set(true), _)) = options.get(&OpenOption::Read)
&& let Some((Argument::Set(true), _)) = options.get(&OpenOption::Truncate)
&& let None | Some((Argument::Set(false), _)) = options.get(&OpenOption::Write)
{
span_lint(
cx,
NONSENSICAL_OPEN_OPTIONS,
span,
"file opened with `truncate` and `read`",
);
}
{
span_lint(
cx,
NONSENSICAL_OPEN_OPTIONS,
span,
"file opened with `truncate` and `read`",
);
}
if let Some((Argument::Set(true), _)) = options.get(&OpenOption::Append)
&& let Some((Argument::Set(true), _)) = options.get(&OpenOption::Truncate)
{
span_lint(
cx,
NONSENSICAL_OPEN_OPTIONS,
span,
"file opened with `append` and `truncate`",
);
{
span_lint(
cx,
NONSENSICAL_OPEN_OPTIONS,
span,
"file opened with `append` and `truncate`",
);
}
if let Some((Argument::Set(true), create_span)) = options.get(&OpenOption::Create)
&& let None = options.get(&OpenOption::Truncate)
{
span_lint_and_help(
cx,
SUSPICIOUS_OPEN_OPTIONS,
*create_span,
"file opened with `create`, but `truncate` behavior not defined",
Some(span),
"if you intend to overwrite an existing file entirely, call `.truncate(true)`. if you instead know that you may want to keep some parts of the old file, call `.truncate(false)`"
);
{
span_lint_and_then(
cx,
SUSPICIOUS_OPEN_OPTIONS,
*create_span,
"file opened with `create`, but `truncate` behavior not defined",
|diag| {
diag
.span_suggestion(create_span.shrink_to_hi(), "add", ".truncate(true)".to_string(), rustc_errors::Applicability::MaybeIncorrect)
.help("if you intend to overwrite an existing file entirely, call `.truncate(true)`. if you instead know that you may want to keep some parts of the old file, call `.truncate(false)`");
},
);
}
}