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|
use hir::ModPath;
use ra_ide_db::imports_locator::ImportsLocator;
use ra_syntax::{
ast::{self, AstNode},
SyntaxNode,
};
use crate::{
assist_ctx::{ActionBuilder, Assist, AssistCtx},
auto_import_text_edit, AssistId,
};
use std::collections::BTreeSet;
// Assist: auto_import
//
// If the name is unresolved, provides all possible imports for it.
//
// ```
// fn main() {
// let map = HashMap<|>::new();
// }
// # pub mod std { pub mod collections { pub struct HashMap { } } }
// ```
// ->
// ```
// use std::collections::HashMap;
//
// fn main() {
// let map = HashMap::new();
// }
// # pub mod std { pub mod collections { pub struct HashMap { } } }
// ```
pub(crate) fn auto_import(ctx: AssistCtx) -> Option<Assist> {
let path_to_import: ast::Path = ctx.find_node_at_offset()?;
let path_to_import_syntax = path_to_import.syntax();
if path_to_import_syntax.ancestors().find_map(ast::UseItem::cast).is_some() {
return None;
}
let name_to_import =
path_to_import_syntax.descendants().find_map(ast::NameRef::cast)?.syntax().to_string();
let module = path_to_import_syntax.ancestors().find_map(ast::Module::cast);
let position = match module.and_then(|it| it.item_list()) {
Some(item_list) => item_list.syntax().clone(),
None => {
let current_file = path_to_import_syntax.ancestors().find_map(ast::SourceFile::cast)?;
current_file.syntax().clone()
}
};
let source_analyzer = ctx.source_analyzer(&position, None);
let module_with_name_to_import = source_analyzer.module()?;
if source_analyzer.resolve_path(ctx.db, &path_to_import).is_some() {
return None;
}
let mut imports_locator = ImportsLocator::new(ctx.db);
let proposed_imports = imports_locator
.find_imports(&name_to_import)
.into_iter()
.filter_map(|module_def| module_with_name_to_import.find_use_path(ctx.db, module_def))
.filter(|use_path| !use_path.segments.is_empty())
.take(20)
.collect::<BTreeSet<_>>();
if proposed_imports.is_empty() {
return None;
}
ctx.add_assist_group(AssistId("auto_import"), format!("Import {}", name_to_import), || {
proposed_imports
.into_iter()
.map(|import| import_to_action(import, &position, &path_to_import_syntax))
.collect()
})
}
fn import_to_action(import: ModPath, position: &SyntaxNode, anchor: &SyntaxNode) -> ActionBuilder {
let mut action_builder = ActionBuilder::default();
action_builder.label(format!("Import `{}`", &import));
auto_import_text_edit(position, anchor, &import, action_builder.text_edit_builder());
action_builder
}
#[cfg(test)]
mod tests {
use crate::helpers::{check_assist, check_assist_not_applicable};
use super::*;
#[test]
fn applicable_when_found_an_import() {
check_assist(
auto_import,
r"
<|>PubStruct
pub mod PubMod {
pub struct PubStruct;
}
",
r"
<|>use PubMod::PubStruct;
PubStruct
pub mod PubMod {
pub struct PubStruct;
}
",
);
}
#[test]
fn auto_imports_are_merged() {
check_assist(
auto_import,
r"
use PubMod::PubStruct1;
struct Test {
test: Pub<|>Struct2<u8>,
}
pub mod PubMod {
pub struct PubStruct1;
pub struct PubStruct2<T> {
_t: T,
}
}
",
r"
use PubMod::{PubStruct2, PubStruct1};
struct Test {
test: Pub<|>Struct2<u8>,
}
pub mod PubMod {
pub struct PubStruct1;
pub struct PubStruct2<T> {
_t: T,
}
}
",
);
}
#[test]
fn applicable_when_found_multiple_imports() {
check_assist(
auto_import,
r"
PubSt<|>ruct
pub mod PubMod1 {
pub struct PubStruct;
}
pub mod PubMod2 {
pub struct PubStruct;
}
pub mod PubMod3 {
pub struct PubStruct;
}
",
r"
use PubMod1::PubStruct;
PubSt<|>ruct
pub mod PubMod1 {
pub struct PubStruct;
}
pub mod PubMod2 {
pub struct PubStruct;
}
pub mod PubMod3 {
pub struct PubStruct;
}
",
);
}
#[test]
fn not_applicable_for_already_imported_types() {
check_assist_not_applicable(
auto_import,
r"
use PubMod::PubStruct;
PubStruct<|>
pub mod PubMod {
pub struct PubStruct;
}
",
);
}
#[test]
fn not_applicable_for_types_with_private_paths() {
check_assist_not_applicable(
auto_import,
r"
PrivateStruct<|>
pub mod PubMod {
struct PrivateStruct;
}
",
);
}
#[test]
fn not_applicable_when_no_imports_found() {
check_assist_not_applicable(
auto_import,
"
PubStruct<|>",
);
}
#[test]
fn not_applicable_in_import_statements() {
check_assist_not_applicable(
auto_import,
r"
use PubStruct<|>;
pub mod PubMod {
pub struct PubStruct;
}",
);
}
#[test]
fn function_import() {
check_assist(
auto_import,
r"
test_function<|>
pub mod PubMod {
pub fn test_function() {};
}
",
r"
use PubMod::test_function;
test_function<|>
pub mod PubMod {
pub fn test_function() {};
}
",
);
}
}
|
