From d0a782ef1c53ef5c5d3b49b02c498f7a688c3a4d Mon Sep 17 00:00:00 2001
From: Kirill Bulatov <mail4score@gmail.com>
Date: Fri, 24 Jan 2020 09:33:18 +0200
Subject: Have a better trait interface

---
 crates/ra_assists/src/assists/auto_import.rs | 26 ++++++++++++++++----------
 crates/ra_assists/src/lib.rs                 | 10 +++-------
 2 files changed, 19 insertions(+), 17 deletions(-)

(limited to 'crates/ra_assists/src')

diff --git a/crates/ra_assists/src/assists/auto_import.rs b/crates/ra_assists/src/assists/auto_import.rs
index ae216944b..d196f6c5c 100644
--- a/crates/ra_assists/src/assists/auto_import.rs
+++ b/crates/ra_assists/src/assists/auto_import.rs
@@ -1,4 +1,4 @@
-use hir::db::HirDatabase;
+use hir::{db::HirDatabase, AsName};
 use ra_syntax::{
     ast::{self, AstNode},
     SmolStr, SyntaxElement,
@@ -41,15 +41,21 @@ pub(crate) fn auto_import<F: ImportsLocator>(
             current_file.syntax().clone()
         }
     };
+    let source_analyzer = ctx.source_analyzer(&position, None);
+    let module_with_name_to_import = source_analyzer.module()?;
+    let path_to_import = ctx.covering_element().ancestors().find_map(ast::Path::cast)?;
+    if source_analyzer.resolve_path(ctx.db, &path_to_import).is_some() {
+        return None;
+    }
 
-    let module_with_name_to_import = ctx.source_analyzer(&position, None).module()?;
-    let name_to_import = hir::InFile {
-        file_id: ctx.frange.file_id.into(),
-        value: &find_applicable_name_ref(ctx.covering_element())?,
-    };
-
-    let proposed_imports =
-        imports_locator.find_imports(name_to_import, module_with_name_to_import)?;
+    let name_to_import = &find_applicable_name_ref(ctx.covering_element())?.as_name();
+    let proposed_imports = imports_locator
+        .find_imports(&name_to_import.to_string())
+        .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::<std::collections::HashSet<_>>();
     if proposed_imports.is_empty() {
         return None;
     }
@@ -57,7 +63,7 @@ pub(crate) fn auto_import<F: ImportsLocator>(
     ctx.add_assist_group(AssistId("auto_import"), "auto import", || {
         proposed_imports
             .into_iter()
-            .map(|import| import_to_action(import.to_string(), &position, &path))
+            .map(|import| import_to_action(import.to_string(), &position, &path_to_import))
             .collect()
     })
 }
diff --git a/crates/ra_assists/src/lib.rs b/crates/ra_assists/src/lib.rs
index 381a51df6..9e4ebec47 100644
--- a/crates/ra_assists/src/lib.rs
+++ b/crates/ra_assists/src/lib.rs
@@ -14,9 +14,9 @@ mod test_db;
 pub mod ast_transform;
 
 use either::Either;
-use hir::{db::HirDatabase, InFile, ModPath, Module};
+use hir::{db::HirDatabase, ModuleDef};
 use ra_db::FileRange;
-use ra_syntax::{ast::NameRef, TextRange, TextUnit};
+use ra_syntax::{TextRange, TextUnit};
 use ra_text_edit::TextEdit;
 
 pub(crate) use crate::assist_ctx::{Assist, AssistCtx};
@@ -85,11 +85,7 @@ where
 /// accessible from the ra_assists crate.
 pub trait ImportsLocator {
     /// Finds all imports for the given name and the module that contains this name.
-    fn find_imports(
-        &mut self,
-        name_to_import: InFile<&NameRef>,
-        module_with_name_to_import: Module,
-    ) -> Option<Vec<ModPath>>;
+    fn find_imports(&mut self, name_to_import: &str) -> Vec<ModuleDef>;
 }
 
 /// Return all the assists applicable at the given position
-- 
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