3 files changed, 96 insertions, 26 deletions

diff --git a/crates/ra_ide/src/completion.rs b/crates/ra_ide/src/completion.rs
index 4a1a2a04a..3be8b1903 100644
--- a/crates/ra_ide/src/completion.rs
+++ b/crates/ra_ide/src/completion.rs
@@ -94,5 +94,8 @@ pub(crate) fn completions(
     complete_macro_in_item_position::complete_macro_in_item_position(&mut acc, &ctx);
     complete_trait_impl::complete_trait_impl(&mut acc, &ctx);
 
+    // Reorder completion items if there is a sort_option
+    acc.sort();
+
     Some(acc)
 }
diff --git a/crates/ra_ide/src/completion/complete_dot.rs b/crates/ra_ide/src/completion/complete_dot.rs
index b5448af5c..cb899d8ff 100644
--- a/crates/ra_ide/src/completion/complete_dot.rs
+++ b/crates/ra_ide/src/completion/complete_dot.rs
@@ -1,14 +1,23 @@
 //! FIXME: write short doc here
 
-use hir::{HasVisibility, HirDisplay, Type};
+use hir::{
+    HasVisibility,
+    // HirDisplay,
+    Type,
+};
 
 use crate::completion::completion_item::CompletionKind;
 use crate::{
-    completion::{completion_context::CompletionContext, completion_item::Completions},
+    call_info::call_info,
+    completion::{
+        completion_context::CompletionContext,
+        completion_item::{Completions, SortOption},
+    },
+    // CallInfo,
     CompletionItem,
 };
 use rustc_hash::FxHashSet;
-use std::cmp::Ordering;
+// use std::cmp::Ordering;
 
 /// Complete dot accesses, i.e. fields or methods (and .await syntax).
 pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
@@ -38,30 +47,40 @@ pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) {
 
 fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: &Type) {
     for receiver in receiver.autoderef(ctx.db) {
-        let mut fields = receiver.fields(ctx.db);
-        if let Some(call_info) = &ctx.call_info {
-            if let Some(active_parameter_type) = call_info.active_parameter_type() {
-                let active_parameter_name = call_info.active_parameter_name().unwrap();
-                fields.sort_by(|a, b| {
-                    // For the same type
-                    if active_parameter_type == a.1.display(ctx.db).to_string() {
-                        // If same type + same name then go top position
-                        if active_parameter_name == a.0.name(ctx.db).to_string() {
-                            Ordering::Less
-                        } else {
-                            if active_parameter_type == b.1.display(ctx.db).to_string() {
-                                Ordering::Equal
-                            } else {
-                                Ordering::Less
-                            }
-                        }
-                    } else {
-                        Ordering::Greater
-                    }
-                });
-            }
+        let fields = receiver.fields(ctx.db);
+
+        // If we use this implementation we can delete call_info in the CompletionContext
+        if let Some(call_info) = call_info(ctx.db, ctx.file_position) {
+            acc.with_sort_option(SortOption::CallFn(call_info));
         }
 
+        // // For Call Fn
+        // if let Some(call_info) = &ctx.call_info {
+        //     if let Some(active_parameter_type) = call_info.active_parameter_type() {
+        //         let active_parameter_name = call_info.active_parameter_name().unwrap();
+        //         fields.sort_by(|a, b| {
+        //             // For the same type
+        //             if active_parameter_type == a.1.display(ctx.db).to_string() {
+        //                 // If same type + same name then go top position
+        //                 if active_parameter_name == a.0.name(ctx.db).to_string() {
+        //                     Ordering::Less
+        //                 } else {
+        //                     if active_parameter_type == b.1.display(ctx.db).to_string() {
+        //                         Ordering::Equal
+        //                     } else {
+        //                         Ordering::Less
+        //                     }
+        //                 }
+        //             } else {
+        //                 Ordering::Greater
+        //             }
+        //         });
+        //     }
+        // }
+
+        // For Lit struct fields
+        // ---
+
         for (field, ty) in fields {
             if ctx.scope().module().map_or(false, |m| !field.is_visible_from(ctx.db, m)) {
                 // Skip private field. FIXME: If the definition location of the
diff --git a/crates/ra_ide/src/completion/completion_item.rs b/crates/ra_ide/src/completion/completion_item.rs
index bc0f1aff5..f8e6e53f1 100644
--- a/crates/ra_ide/src/completion/completion_item.rs
+++ b/crates/ra_ide/src/completion/completion_item.rs
@@ -1,7 +1,8 @@
 //! FIXME: write short doc here
 
-use std::fmt;
+use std::{cmp::Ordering, fmt};
 
+use crate::CallInfo;
 use hir::Documentation;
 use ra_syntax::TextRange;
 use ra_text_edit::TextEdit;
@@ -297,10 +298,17 @@ impl<'a> Into<CompletionItem> for Builder {
     }
 }
 
+#[derive(Debug)]
+pub(crate) enum SortOption {
+    CallFn(CallInfo),
+    // LitStruct,
+}
+
 /// Represents an in-progress set of completions being built.
 #[derive(Debug, Default)]
 pub(crate) struct Completions {
     buf: Vec<CompletionItem>,
+    sort_option: Option<SortOption>,
 }
 
 impl Completions {
@@ -314,6 +322,46 @@ impl Completions {
     {
         items.into_iter().for_each(|item| self.add(item.into()))
     }
+
+    pub(crate) fn with_sort_option(&mut self, sort_option: SortOption) {
+        self.sort_option = Some(sort_option);
+    }
+
+    pub(crate) fn sort(&mut self) {
+        if self.sort_option.is_none() {
+            return;
+        }
+        let sort_option = self.sort_option.as_ref().unwrap();
+
+        match sort_option {
+            SortOption::CallFn(call_info) => {
+                if let Some(active_parameter_type) = call_info.active_parameter_type() {
+                    let active_parameter_name = call_info.active_parameter_name().unwrap();
+
+                    self.buf.sort_by(|a, b| {
+                        // For the same type
+                        if let Some(a_parameter_type) = &a.detail {
+                            if &active_parameter_type == a_parameter_type {
+                                // If same type + same name then go top position
+                                if active_parameter_name != a.label {
+                                    if let Some(b_parameter_type) = &b.detail {
+                                        if &active_parameter_type == b_parameter_type {
+                                            return Ordering::Equal;
+                                        }
+                                    }
+                                }
+                                Ordering::Less
+                            } else {
+                                Ordering::Greater
+                            }
+                        } else {
+                            Ordering::Greater
+                        }
+                    });
+                }
+            } // _ => unimplemented!("sort options not already implemented"),
+        }
+    }
 }
 
 impl Into<Vec<CompletionItem>> for Completions {