From 4fe5786c0cdab1273685a0668107915b843bcaf6 Mon Sep 17 00:00:00 2001
From: Kirill Bulatov <mail4score@gmail.com>
Date: Sat, 20 Feb 2021 13:53:50 +0200
Subject: Consider import prefix config settings during flyimports

---
 crates/hir/src/code_model.rs                       |  2 +-
 crates/ide_completion/src/completions/flyimport.rs | 94 +++++++++++++++++++++-
 crates/ide_completion/src/lib.rs                   |  2 +-
 3 files changed, 94 insertions(+), 4 deletions(-)

diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index 7d43d4097..021e4ad31 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -2076,7 +2076,7 @@ impl Callable {
 }
 
 /// For IDE only
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq, Hash)]
 pub enum ScopeDef {
     ModuleDef(ModuleDef),
     MacroDef(MacroDef),
diff --git a/crates/ide_completion/src/completions/flyimport.rs b/crates/ide_completion/src/completions/flyimport.rs
index c9f928483..da8375af9 100644
--- a/crates/ide_completion/src/completions/flyimport.rs
+++ b/crates/ide_completion/src/completions/flyimport.rs
@@ -53,6 +53,7 @@ use ide_db::helpers::{
     import_assets::{ImportAssets, ImportCandidate},
     insert_use::ImportScope,
 };
+use rustc_hash::FxHashSet;
 use syntax::{AstNode, SyntaxNode, T};
 use test_utils::mark;
 
@@ -91,8 +92,10 @@ pub(crate) fn import_on_the_fly(acc: &mut Completions, ctx: &CompletionContext)
         position_for_import(ctx, Some(import_assets.import_candidate()))?,
         &ctx.sema,
     )?;
+
+    let scope_definitions = scope_definitions(ctx);
     let mut all_mod_paths = import_assets
-        .search_for_relative_paths(&ctx.sema)
+        .search_for_imports(&ctx.sema, ctx.config.insert_use.prefix_kind)
         .into_iter()
         .map(|(mod_path, item_in_ns)| {
             let scope_item = match item_in_ns {
@@ -102,6 +105,7 @@ pub(crate) fn import_on_the_fly(acc: &mut Completions, ctx: &CompletionContext)
             };
             (mod_path, scope_item)
         })
+        .filter(|(_, proposed_def)| !scope_definitions.contains(proposed_def))
         .collect::<Vec<_>>();
     all_mod_paths.sort_by_cached_key(|(mod_path, _)| {
         compute_fuzzy_completion_order_key(mod_path, &user_input_lowercased)
@@ -125,6 +129,14 @@ pub(crate) fn import_on_the_fly(acc: &mut Completions, ctx: &CompletionContext)
     Some(())
 }
 
+fn scope_definitions(ctx: &CompletionContext) -> FxHashSet<ScopeDef> {
+    let mut scope_definitions = FxHashSet::default();
+    ctx.scope.process_all_names(&mut |_, scope_def| {
+        scope_definitions.insert(scope_def);
+    });
+    scope_definitions
+}
+
 pub(crate) fn position_for_import<'a>(
     ctx: &'a CompletionContext,
     import_candidate: Option<&ImportCandidate>,
@@ -192,7 +204,7 @@ mod tests {
 
     use crate::{
         item::CompletionKind,
-        test_utils::{check_edit, completion_list},
+        test_utils::{check_edit, check_edit_with_config, completion_list, TEST_CONFIG},
     };
 
     fn check(ra_fixture: &str, expect: Expect) {
@@ -685,4 +697,82 @@ fn main() {}
             expect![[]],
         );
     }
+
+    #[test]
+    fn prefix_config_usage() {
+        let fixture = r#"
+mod foo {
+    pub mod bar {
+        pub struct Item;
+    }
+}
+
+use crate::foo::bar;
+
+fn main() {
+    Ite$0
+}"#;
+        let mut config = TEST_CONFIG;
+
+        config.insert_use.prefix_kind = hir::PrefixKind::ByCrate;
+        check_edit_with_config(
+            config.clone(),
+            "Item",
+            fixture,
+            r#"
+mod foo {
+    pub mod bar {
+        pub struct Item;
+    }
+}
+
+use crate::foo::bar::{self, Item};
+
+fn main() {
+    Item
+}"#,
+        );
+
+        config.insert_use.prefix_kind = hir::PrefixKind::BySelf;
+        check_edit_with_config(
+            config.clone(),
+            "Item",
+            fixture,
+            r#"
+mod foo {
+    pub mod bar {
+        pub struct Item;
+    }
+}
+
+use crate::foo::bar;
+
+use self::foo::bar::Item;
+
+fn main() {
+    Item
+}"#,
+        );
+
+        config.insert_use.prefix_kind = hir::PrefixKind::Plain;
+        check_edit_with_config(
+            config,
+            "Item",
+            fixture,
+            r#"
+mod foo {
+    pub mod bar {
+        pub struct Item;
+    }
+}
+
+use foo::bar::Item;
+
+use crate::foo::bar;
+
+fn main() {
+    Item
+}"#,
+        );
+    }
 }
diff --git a/crates/ide_completion/src/lib.rs b/crates/ide_completion/src/lib.rs
index db8bfbbc3..76f31de9e 100644
--- a/crates/ide_completion/src/lib.rs
+++ b/crates/ide_completion/src/lib.rs
@@ -151,7 +151,7 @@ pub fn resolve_completion_edits(
     let import_path = imports_locator::find_exact_imports(&ctx.sema, current_crate, imported_name)
         .filter_map(|candidate| {
             let item: hir::ItemInNs = candidate.either(Into::into, Into::into);
-            current_module.find_use_path(db, item)
+            current_module.find_use_path_prefixed(db, item, config.insert_use.prefix_kind)
         })
         .find(|mod_path| mod_path.to_string() == full_import_path)?;
 
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