fix: support let-chains in replace_is_method_with_if_let_method

crates/ide-assists/src/handlers/replace_is_method_with_if_let_method.rs

@@ -1,7 +1,7 @@
 use ide_db::syntax_helpers::suggest_name;
 use syntax::ast::{self, AstNode, syntax_factory::SyntaxFactory};
 
-use crate::{AssistContext, AssistId, Assists};
+use crate::{AssistContext, AssistId, Assists, utils::cover_let_chain};
 
 // Assist: replace_is_some_with_if_let_some
 //
@@ -27,13 +27,11 @@ pub(crate) fn replace_is_method_with_if_let_method(
     let if_expr = ctx.find_node_at_offset::<ast::IfExpr>()?;
 
     let cond = if_expr.condition()?;
+    let cond = cover_let_chain(cond, ctx.selection_trimmed())?;
     let call_expr = match cond {
         ast::Expr::MethodCallExpr(call) => call,
         _ => return None,
     };
-    if ctx.offset() > if_expr.then_branch()?.stmt_list()?.l_curly_token()?.text_range().end() {
-        return None;
-    }
 
     let name_ref = call_expr.name_ref()?;
     match name_ref.text().as_str() {
@@ -195,6 +193,63 @@ fn main() {
         );
     }
 
+    #[test]
+    fn replace_is_some_with_if_let_some_in_let_chain() {
+        check_assist(
+            replace_is_method_with_if_let_method,
+            r#"
+fn main() {
+    let x = Some(1);
+    let cond = true;
+    if cond && x.is_som$0e() {}
+}
+"#,
+            r#"
+fn main() {
+    let x = Some(1);
+    let cond = true;
+    if cond && let Some(${0:x1}) = x {}
+}
+"#,
+        );
+
+        check_assist(
+            replace_is_method_with_if_let_method,
+            r#"
+fn main() {
+    let x = Some(1);
+    let cond = true;
+    if x.is_som$0e() && cond {}
+}
+"#,
+            r#"
+fn main() {
+    let x = Some(1);
+    let cond = true;
+    if let Some(${0:x1}) = x && cond {}
+}
+"#,
+        );
+
+        check_assist(
+            replace_is_method_with_if_let_method,
+            r#"
+fn main() {
+    let x = Some(1);
+    let cond = true;
+    if cond && x.is_som$0e() && cond {}
+}
+"#,
+            r#"
+fn main() {
+    let x = Some(1);
+    let cond = true;
+    if cond && let Some(${0:x1}) = x && cond {}
+}
+"#,
+        );
+    }
+
     #[test]
     fn replace_is_some_with_if_let_some_not_applicable_after_l_curly() {
         check_assist_not_applicable(

crates/ide-assists/src/utils.rs

@@ -1133,6 +1133,28 @@ pub(crate) fn tt_from_syntax(node: SyntaxNode) -> Vec<NodeOrToken<ast::TokenTree
     tt_stack.pop().expect("parent token tree was closed before it was completed").1
 }
 
+pub(crate) fn cover_let_chain(mut expr: ast::Expr, range: TextRange) -> Option<ast::Expr> {
+    if !expr.syntax().text_range().contains_range(range) {
+        return None;
+    }
+    loop {
+        let (chain_expr, rest) = if let ast::Expr::BinExpr(bin_expr) = &expr
+            && bin_expr.op_kind() == Some(ast::BinaryOp::LogicOp(ast::LogicOp::And))
+        {
+            (bin_expr.rhs(), bin_expr.lhs())
+        } else {
+            (Some(expr), None)
+        };
+
+        if let Some(chain_expr) = chain_expr
+            && chain_expr.syntax().text_range().contains_range(range)
+        {
+            break Some(chain_expr);
+        }
+        expr = rest?;
+    }
+}
+
 pub fn is_body_const(sema: &Semantics<'_, RootDatabase>, expr: &ast::Expr) -> bool {
     let mut is_const = true;
     preorder_expr(expr, &mut |ev| {