feat: add support for other ADT types and destructuring patterns

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

@@ -6,6 +6,7 @@ use ide_db::{
     imports::insert_use::{insert_use, ImportScope},
     search::{FileReference, UsageSearchResult},
     source_change::SourceChangeBuilder,
+    FxHashSet,
 };
 use itertools::Itertools;
 use syntax::{
@@ -17,6 +18,7 @@ use syntax::{
     },
     ted, AstNode, NodeOrToken, SyntaxNode, T,
 };
+use text_edit::TextRange;
 
 use crate::assist_context::{AssistContext, Assists};
 
@@ -52,7 +54,7 @@ use crate::assist_context::{AssistContext, Assists};
 pub(crate) fn bool_to_enum(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
     let BoolNodeData { target_node, name, ty_annotation, initializer, definition } =
         find_bool_node(ctx)?;
-    let target_module = ctx.sema.scope(&target_node)?.module();
+    let target_module = ctx.sema.scope(&target_node)?.module().nearest_non_block_module(ctx.db());
 
     let target = name.syntax().text_range();
     acc.add(
@@ -70,9 +72,8 @@ pub(crate) fn bool_to_enum(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option
             }
 
             let usages = definition.usages(&ctx.sema).all();
-
             add_enum_def(edit, ctx, &usages, target_node, &target_module);
-            replace_usages(edit, ctx, &usages, &target_module);
+            replace_usages(edit, ctx, &usages, definition, &target_module);
         },
     )
 }
@@ -144,14 +145,14 @@ fn find_bool_node(ctx: &AssistContext<'_>) -> Option<BoolNodeData> {
             return None;
         }
 
-        let strukt = field.syntax().ancestors().find_map(ast::Struct::cast)?;
+        let adt = field.syntax().ancestors().find_map(ast::Adt::cast)?;
         let def = ctx.sema.to_def(&field)?;
         if !def.ty(ctx.db()).is_bool() {
             cov_mark::hit!(not_applicable_non_bool_field);
             return None;
         }
         Some(BoolNodeData {
-            target_node: strukt.syntax().clone(),
+            target_node: adt.syntax().clone(),
             name,
             ty_annotation: field.ty(),
             initializer: None,
@@ -192,78 +193,171 @@ fn replace_usages(
     edit: &mut SourceChangeBuilder,
     ctx: &AssistContext<'_>,
     usages: &UsageSearchResult,
+    target_definition: Definition,
     target_module: &hir::Module,
 ) {
     for (file_id, references) in usages.iter() {
         edit.edit_file(*file_id);
 
-        // add imports across modules where needed
-        references
-            .iter()
-            .filter_map(|FileReference { name, .. }| {
-                ctx.sema.scope(name.syntax()).map(|scope| (name, scope.module()))
-            })
-            .unique_by(|name_and_module| name_and_module.1)
-            .filter(|(_, module)| module != target_module)
-            .filter_map(|(name, module)| {
-                let import_scope = ImportScope::find_insert_use_container(name.syntax(), &ctx.sema);
-                let mod_path = module.find_use_path_prefixed(
-                    ctx.sema.db,
-                    ModuleDef::Module(*target_module),
-                    ctx.config.insert_use.prefix_kind,
-                    ctx.config.prefer_no_std,
-                );
-                import_scope.zip(mod_path)
-            })
-            .for_each(|(import_scope, mod_path)| {
-                let import_scope = match import_scope {
-                    ImportScope::File(it) => ImportScope::File(edit.make_mut(it)),
-                    ImportScope::Module(it) => ImportScope::Module(edit.make_mut(it)),
-                    ImportScope::Block(it) => ImportScope::Block(edit.make_mut(it)),
-                };
-                let path =
-                    make::path_concat(mod_path_to_ast(&mod_path), make::path_from_text("Bool"));
-                insert_use(&import_scope, path, &ctx.config.insert_use);
-            });
+        let refs_with_imports =
+            augment_references_with_imports(edit, ctx, references, target_module);
 
-        // replace the usages in expressions
-        references
-            .into_iter()
-            .filter_map(|FileReference { range, name, .. }| match name {
-                ast::NameLike::NameRef(name) => Some((*range, name)),
-                _ => None,
-            })
-            .rev()
-            .for_each(|(range, name_ref)| {
-                if let Some(initializer) = find_assignment_usage(name_ref) {
+        refs_with_imports.into_iter().rev().for_each(
+            |FileReferenceWithImport { range, old_name, new_name, import_data }| {
+                // replace the usages in patterns and expressions
+                if let Some(ident_pat) = old_name.syntax().ancestors().find_map(ast::IdentPat::cast)
+                {
+                    cov_mark::hit!(replaces_record_pat_shorthand);
+
+                    let definition = ctx.sema.to_def(&ident_pat).map(Definition::Local);
+                    if let Some(def) = definition {
+                        replace_usages(
+                            edit,
+                            ctx,
+                            &def.usages(&ctx.sema).all(),
+                            target_definition,
+                            target_module,
+                        )
+                    }
+                } else if let Some(initializer) = find_assignment_usage(&new_name) {
                     cov_mark::hit!(replaces_assignment);
 
                     replace_bool_expr(edit, initializer);
-                } else if let Some((prefix_expr, inner_expr)) = find_negated_usage(name_ref) {
+                } else if let Some((prefix_expr, inner_expr)) = find_negated_usage(&new_name) {
                     cov_mark::hit!(replaces_negation);
 
                     edit.replace(
                         prefix_expr.syntax().text_range(),
                         format!("{} == Bool::False", inner_expr),
                     );
-                } else if let Some((record_field, initializer)) = find_record_expr_usage(name_ref) {
+                } else if let Some((record_field, initializer)) = old_name
+                    .as_name_ref()
+                    .and_then(ast::RecordExprField::for_field_name)
+                    .and_then(|record_field| ctx.sema.resolve_record_field(&record_field))
+                    .and_then(|(got_field, _, _)| {
+                        find_record_expr_usage(&new_name, got_field, target_definition)
+                    })
+                {
                     cov_mark::hit!(replaces_record_expr);
 
                     let record_field = edit.make_mut(record_field);
                     let enum_expr = bool_expr_to_enum_expr(initializer);
                     record_field.replace_expr(enum_expr);
-                } else if name_ref.syntax().ancestors().find_map(ast::UseTree::cast).is_none() {
+                } else if let Some(pat) = find_record_pat_field_usage(&old_name) {
+                    match pat {
+                        ast::Pat::IdentPat(ident_pat) => {
+                            cov_mark::hit!(replaces_record_pat);
+
+                            let definition = ctx.sema.to_def(&ident_pat).map(Definition::Local);
+                            if let Some(def) = definition {
+                                replace_usages(
+                                    edit,
+                                    ctx,
+                                    &def.usages(&ctx.sema).all(),
+                                    target_definition,
+                                    target_module,
+                                )
+                            }
+                        }
+                        ast::Pat::LiteralPat(literal_pat) => {
+                            cov_mark::hit!(replaces_literal_pat);
+
+                            if let Some(expr) = literal_pat.literal().and_then(|literal| {
+                                literal.syntax().ancestors().find_map(ast::Expr::cast)
+                            }) {
+                                replace_bool_expr(edit, expr);
+                            }
+                        }
+                        _ => (),
+                    }
+                } else if new_name.syntax().ancestors().find_map(ast::UseTree::cast).is_none() {
                     // for any other usage in an expression, replace it with a check that it is the true variant
-                    edit.replace(range, format!("{} == Bool::True", name_ref.text()));
-                }
+                    if let Some((record_field, expr)) = new_name
+                        .as_name_ref()
+                        .and_then(ast::RecordExprField::for_field_name)
+                        .and_then(|record_field| {
+                            record_field.expr().map(|expr| (record_field, expr))
                         })
+                    {
+                        record_field.replace_expr(
+                            make::expr_bin_op(
+                                expr,
+                                ast::BinaryOp::CmpOp(ast::CmpOp::Eq { negated: false }),
+                                make::expr_path(make::path_from_text("Bool::True")),
+                            )
+                            .clone_for_update(),
+                        );
+                    } else {
+                        edit.replace(range, format!("{} == Bool::True", new_name.text()));
                     }
                 }
 
-fn find_assignment_usage(name_ref: &ast::NameRef) -> Option<ast::Expr> {
-    let bin_expr = name_ref.syntax().ancestors().find_map(ast::BinExpr::cast)?;
+                // add imports across modules where needed
+                if let Some((import_scope, path)) = import_data {
+                    insert_use(&import_scope, path, &ctx.config.insert_use);
+                }
+            },
+        )
+    }
+}
 
-    if !bin_expr.lhs()?.syntax().descendants().contains(name_ref.syntax()) {
+struct FileReferenceWithImport {
+    range: TextRange,
+    old_name: ast::NameLike,
+    new_name: ast::NameLike,
+    import_data: Option<(ImportScope, ast::Path)>,
+}
+
+fn augment_references_with_imports(
+    edit: &mut SourceChangeBuilder,
+    ctx: &AssistContext<'_>,
+    references: &[FileReference],
+    target_module: &hir::Module,
+) -> Vec<FileReferenceWithImport> {
+    let mut visited_modules = FxHashSet::default();
+
+    references
+        .iter()
+        .filter_map(|FileReference { range, name, .. }| {
+            ctx.sema.scope(name.syntax()).map(|scope| (*range, name, scope.module()))
+        })
+        .map(|(range, name, ref_module)| {
+            let old_name = name.clone();
+            let new_name = edit.make_mut(name.clone());
+
+            // if the referenced module is not the same as the target one and has not been seen before, add an import
+            let import_data = if ref_module.nearest_non_block_module(ctx.db()) != *target_module
+                && !visited_modules.contains(&ref_module)
+            {
+                visited_modules.insert(ref_module);
+
+                let import_scope =
+                    ImportScope::find_insert_use_container(new_name.syntax(), &ctx.sema);
+                let path = ref_module
+                    .find_use_path_prefixed(
+                        ctx.sema.db,
+                        ModuleDef::Module(*target_module),
+                        ctx.config.insert_use.prefix_kind,
+                        ctx.config.prefer_no_std,
+                    )
+                    .map(|mod_path| {
+                        make::path_concat(mod_path_to_ast(&mod_path), make::path_from_text("Bool"))
+                    });
+
+                import_scope.zip(path)
+            } else {
+                None
+            };
+
+            FileReferenceWithImport { range, old_name, new_name, import_data }
+        })
+        .collect()
+}
+
+fn find_assignment_usage(name: &ast::NameLike) -> Option<ast::Expr> {
+    let bin_expr = name.syntax().ancestors().find_map(ast::BinExpr::cast)?;
+
+    if !bin_expr.lhs()?.syntax().descendants().contains(name.syntax()) {
         cov_mark::hit!(dont_assign_incorrect_ref);
         return None;
     }
@@ -275,8 +369,8 @@ fn find_assignment_usage(name_ref: &ast::NameRef) -> Option<ast::Expr> {
     }
 }
 
-fn find_negated_usage(name_ref: &ast::NameRef) -> Option<(ast::PrefixExpr, ast::Expr)> {
-    let prefix_expr = name_ref.syntax().ancestors().find_map(ast::PrefixExpr::cast)?;
+fn find_negated_usage(name: &ast::NameLike) -> Option<(ast::PrefixExpr, ast::Expr)> {
+    let prefix_expr = name.syntax().ancestors().find_map(ast::PrefixExpr::cast)?;
 
     if !matches!(prefix_expr.expr()?, ast::Expr::PathExpr(_) | ast::Expr::FieldExpr(_)) {
         cov_mark::hit!(dont_overwrite_expression_inside_negation);
@@ -291,15 +385,31 @@ fn find_negated_usage(name_ref: &ast::NameRef) -> Option<(ast::PrefixExpr, ast::
     }
 }
 
-fn find_record_expr_usage(name_ref: &ast::NameRef) -> Option<(ast::RecordExprField, ast::Expr)> {
-    let record_field = name_ref.syntax().ancestors().find_map(ast::RecordExprField::cast)?;
+fn find_record_expr_usage(
+    name: &ast::NameLike,
+    got_field: hir::Field,
+    target_definition: Definition,
+) -> Option<(ast::RecordExprField, ast::Expr)> {
+    let name_ref = name.as_name_ref()?;
+    let record_field = ast::RecordExprField::for_field_name(name_ref)?;
     let initializer = record_field.expr()?;
 
-    if record_field.field_name()?.syntax().descendants().contains(name_ref.syntax()) {
+    if let Definition::Field(expected_field) = target_definition {
+        if got_field != expected_field {
+            return None;
+        }
+    }
+
     Some((record_field, initializer))
-    } else {
-        cov_mark::hit!(dont_overwrite_wrong_record_field);
-        None
+}
+
+fn find_record_pat_field_usage(name: &ast::NameLike) -> Option<ast::Pat> {
+    let record_pat_field = name.syntax().parent().and_then(ast::RecordPatField::cast)?;
+    let pat = record_pat_field.pat()?;
+
+    match pat {
+        ast::Pat::IdentPat(_) | ast::Pat::LiteralPat(_) | ast::Pat::WildcardPat(_) => Some(pat),
+        _ => None,
     }
 }
 
@@ -317,7 +427,7 @@ fn add_enum_def(
         .filter_map(|FileReference { name, .. }| {
             ctx.sema.scope(name.syntax()).map(|scope| scope.module())
         })
-        .any(|module| &module != target_module);
+        .any(|module| module.nearest_non_block_module(ctx.db()) != *target_module);
     let enum_def = make_bool_enum(make_enum_pub);
 
     let indent = IndentLevel::from_node(&target_node);
@@ -646,7 +756,7 @@ fn main() {
     }
 
     #[test]
-    fn field_basic() {
+    fn field_struct_basic() {
         cov_mark::check!(replaces_record_expr);
         check_assist(
             bool_to_enum,
@@ -684,6 +794,263 @@ fn main() {
         )
     }
 
+    #[test]
+    fn field_enum_basic() {
+        cov_mark::check!(replaces_record_pat);
+        check_assist(
+            bool_to_enum,
+            r#"
+enum Foo {
+    Foo,
+    Bar { $0bar: bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: true };
+
+    if let Foo::Bar { bar: baz } = foo {
+        if baz {
+            println!("foo");
+        }
+    }
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq)]
+enum Bool { True, False }
+
+enum Foo {
+    Foo,
+    Bar { bar: Bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: Bool::True };
+
+    if let Foo::Bar { bar: baz } = foo {
+        if baz == Bool::True {
+            println!("foo");
+        }
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn field_enum_cross_file() {
+        check_assist(
+            bool_to_enum,
+            r#"
+//- /foo.rs
+pub enum Foo {
+    Foo,
+    Bar { $0bar: bool },
+}
+
+fn foo() {
+    let foo = Foo::Bar { bar: true };
+}
+
+//- /main.rs
+use foo::Foo;
+
+mod foo;
+
+fn main() {
+    let foo = Foo::Bar { bar: false };
+}
+"#,
+            r#"
+//- /foo.rs
+#[derive(PartialEq, Eq)]
+pub enum Bool { True, False }
+
+pub enum Foo {
+    Foo,
+    Bar { bar: Bool },
+}
+
+fn foo() {
+    let foo = Foo::Bar { bar: Bool::True };
+}
+
+//- /main.rs
+use foo::{Foo, Bool};
+
+mod foo;
+
+fn main() {
+    let foo = Foo::Bar { bar: Bool::False };
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn field_enum_shorthand() {
+        cov_mark::check!(replaces_record_pat_shorthand);
+        check_assist(
+            bool_to_enum,
+            r#"
+enum Foo {
+    Foo,
+    Bar { $0bar: bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: true };
+
+    match foo {
+        Foo::Bar { bar } => {
+            if bar {
+                println!("foo");
+            }
+        }
+        _ => (),
+    }
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq)]
+enum Bool { True, False }
+
+enum Foo {
+    Foo,
+    Bar { bar: Bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: Bool::True };
+
+    match foo {
+        Foo::Bar { bar } => {
+            if bar == Bool::True {
+                println!("foo");
+            }
+        }
+        _ => (),
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn field_enum_replaces_literal_patterns() {
+        cov_mark::check!(replaces_literal_pat);
+        check_assist(
+            bool_to_enum,
+            r#"
+enum Foo {
+    Foo,
+    Bar { $0bar: bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: true };
+
+    if let Foo::Bar { bar: true } = foo {
+        println!("foo");
+    }
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq)]
+enum Bool { True, False }
+
+enum Foo {
+    Foo,
+    Bar { bar: Bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: Bool::True };
+
+    if let Foo::Bar { bar: Bool::True } = foo {
+        println!("foo");
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn field_enum_keeps_wildcard_patterns() {
+        check_assist(
+            bool_to_enum,
+            r#"
+enum Foo {
+    Foo,
+    Bar { $0bar: bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: true };
+
+    if let Foo::Bar { bar: _ } = foo {
+        println!("foo");
+    }
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq)]
+enum Bool { True, False }
+
+enum Foo {
+    Foo,
+    Bar { bar: Bool },
+}
+
+fn main() {
+    let foo = Foo::Bar { bar: Bool::True };
+
+    if let Foo::Bar { bar: _ } = foo {
+        println!("foo");
+    }
+}
+"#,
+        )
+    }
+
+    #[test]
+    fn field_union_basic() {
+        check_assist(
+            bool_to_enum,
+            r#"
+union Foo {
+    $0foo: bool,
+    bar: usize,
+}
+
+fn main() {
+    let foo = Foo { foo: true };
+
+    if unsafe { foo.foo } {
+        println!("foo");
+    }
+}
+"#,
+            r#"
+#[derive(PartialEq, Eq)]
+enum Bool { True, False }
+
+union Foo {
+    foo: Bool,
+    bar: usize,
+}
+
+fn main() {
+    let foo = Foo { foo: Bool::True };
+
+    if unsafe { foo.foo == Bool::True } {
+        println!("foo");
+    }
+}
+"#,
+        )
+    }
+
     #[test]
     fn field_negated() {
         check_assist(
@@ -841,7 +1208,6 @@ fn main() {
 
     #[test]
     fn field_initialized_with_other() {
-        cov_mark::check!(dont_overwrite_wrong_record_field);
         check_assist(
             bool_to_enum,
             r#"