10 files changed, 147 insertions, 140 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 55016ccf7..847277118 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -678,7 +678,6 @@ dependencies = [
  "either",
  "expect-test",
  "hir",
- "ide_assists",
  "ide_db",
  "itertools",
  "profile",
diff --git a/crates/ide_assists/src/lib.rs b/crates/ide_assists/src/lib.rs
index 804918284..fa378a622 100644
--- a/crates/ide_assists/src/lib.rs
+++ b/crates/ide_assists/src/lib.rs
@@ -17,139 +17,16 @@ mod tests;
 pub mod utils;
 pub mod path_transform;
 
-use std::str::FromStr;
-
 use hir::Semantics;
-use ide_db::{base_db::FileRange, label::Label, source_change::SourceChange, RootDatabase};
+use ide_db::{base_db::FileRange, RootDatabase};
 use syntax::TextRange;
 
 pub(crate) use crate::assist_context::{AssistContext, Assists};
 
 pub use assist_config::AssistConfig;
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum AssistKind {
-    // FIXME: does the None variant make sense? Probably not.
-    None,
-
-    QuickFix,
-    Generate,
-    Refactor,
-    RefactorExtract,
-    RefactorInline,
-    RefactorRewrite,
-}
-
-impl AssistKind {
-    pub fn contains(self, other: AssistKind) -> bool {
-        if self == other {
-            return true;
-        }
-
-        match self {
-            AssistKind::None | AssistKind::Generate => true,
-            AssistKind::Refactor => match other {
-                AssistKind::RefactorExtract
-                | AssistKind::RefactorInline
-                | AssistKind::RefactorRewrite => true,
-                _ => false,
-            },
-            _ => false,
-        }
-    }
-
-    pub fn name(&self) -> &str {
-        match self {
-            AssistKind::None => "None",
-            AssistKind::QuickFix => "QuickFix",
-            AssistKind::Generate => "Generate",
-            AssistKind::Refactor => "Refactor",
-            AssistKind::RefactorExtract => "RefactorExtract",
-            AssistKind::RefactorInline => "RefactorInline",
-            AssistKind::RefactorRewrite => "RefactorRewrite",
-        }
-    }
-}
-
-impl FromStr for AssistKind {
-    type Err = String;
-
-    fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s {
-            "None" => Ok(AssistKind::None),
-            "QuickFix" => Ok(AssistKind::QuickFix),
-            "Generate" => Ok(AssistKind::Generate),
-            "Refactor" => Ok(AssistKind::Refactor),
-            "RefactorExtract" => Ok(AssistKind::RefactorExtract),
-            "RefactorInline" => Ok(AssistKind::RefactorInline),
-            "RefactorRewrite" => Ok(AssistKind::RefactorRewrite),
-            unknown => Err(format!("Unknown AssistKind: '{}'", unknown)),
-        }
-    }
-}
-
-/// Unique identifier of the assist, should not be shown to the user
-/// directly.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct AssistId(pub &'static str, pub AssistKind);
-
-/// A way to control how many asssist to resolve during the assist resolution.
-/// When an assist is resolved, its edits are calculated that might be costly to always do by default.
-#[derive(Debug)]
-pub enum AssistResolveStrategy {
-    /// No assists should be resolved.
-    None,
-    /// All assists should be resolved.
-    All,
-    /// Only a certain assist should be resolved.
-    Single(SingleResolve),
-}
-
-/// Hold the [`AssistId`] data of a certain assist to resolve.
-/// The original id object cannot be used due to a `'static` lifetime
-/// and the requirement to construct this struct dynamically during the resolve handling.
-#[derive(Debug)]
-pub struct SingleResolve {
-    /// The id of the assist.
-    pub assist_id: String,
-    // The kind of the assist.
-    pub assist_kind: AssistKind,
-}
-
-impl AssistResolveStrategy {
-    pub fn should_resolve(&self, id: &AssistId) -> bool {
-        match self {
-            AssistResolveStrategy::None => false,
-            AssistResolveStrategy::All => true,
-            AssistResolveStrategy::Single(single_resolve) => {
-                single_resolve.assist_id == id.0 && single_resolve.assist_kind == id.1
-            }
-        }
-    }
-}
-
-#[derive(Clone, Debug)]
-pub struct GroupLabel(pub String);
-
-#[derive(Debug, Clone)]
-pub struct Assist {
-    pub id: AssistId,
-    /// Short description of the assist, as shown in the UI.
-    pub label: Label,
-    pub group: Option<GroupLabel>,
-    /// Target ranges are used to sort assists: the smaller the target range,
-    /// the more specific assist is, and so it should be sorted first.
-    pub target: TextRange,
-    /// Computing source change sometimes is much more costly then computing the
-    /// other fields. Additionally, the actual change is not required to show
-    /// the lightbulb UI, it only is needed when the user tries to apply an
-    /// assist. So, we compute it lazily: the API allow requesting assists with
-    /// or without source change. We could (and in fact, used to) distinguish
-    /// between resolved and unresolved assists at the type level, but this is
-    /// cumbersome, especially if you want to embed an assist into another data
-    /// structure, such as a diagnostic.
-    pub source_change: Option<SourceChange>,
-}
+pub use ide_db::assists::{
+    Assist, AssistId, AssistKind, AssistResolveStrategy, GroupLabel, SingleResolve,
+};
 
 /// Return all the assists applicable at the given position.
 pub fn assists(
diff --git a/crates/ide_db/src/assists.rs b/crates/ide_db/src/assists.rs
new file mode 100644
index 000000000..7881d8369
--- /dev/null
+++ b/crates/ide_db/src/assists.rs
@@ -0,0 +1,136 @@
+//! This module defines the `Assist` data structure. The actual assist live in
+//! the `ide_assists` downstream crate. We want to define the data structures in
+//! this low-level crate though, because `ide_diagnostics` also need them
+//! (fixits for diagnostics and assists are the same thing under the hood). We
+//! want to compile `ide_assists` and `ide_diagnostics` in parallel though, so
+//! we pull the common definitions upstream, to this crate.
+
+use std::str::FromStr;
+
+use syntax::TextRange;
+
+use crate::{label::Label, source_change::SourceChange};
+
+#[derive(Debug, Clone)]
+pub struct Assist {
+    pub id: AssistId,
+    /// Short description of the assist, as shown in the UI.
+    pub label: Label,
+    pub group: Option<GroupLabel>,
+    /// Target ranges are used to sort assists: the smaller the target range,
+    /// the more specific assist is, and so it should be sorted first.
+    pub target: TextRange,
+    /// Computing source change sometimes is much more costly then computing the
+    /// other fields. Additionally, the actual change is not required to show
+    /// the lightbulb UI, it only is needed when the user tries to apply an
+    /// assist. So, we compute it lazily: the API allow requesting assists with
+    /// or without source change. We could (and in fact, used to) distinguish
+    /// between resolved and unresolved assists at the type level, but this is
+    /// cumbersome, especially if you want to embed an assist into another data
+    /// structure, such as a diagnostic.
+    pub source_change: Option<SourceChange>,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum AssistKind {
+    // FIXME: does the None variant make sense? Probably not.
+    None,
+
+    QuickFix,
+    Generate,
+    Refactor,
+    RefactorExtract,
+    RefactorInline,
+    RefactorRewrite,
+}
+
+impl AssistKind {
+    pub fn contains(self, other: AssistKind) -> bool {
+        if self == other {
+            return true;
+        }
+
+        match self {
+            AssistKind::None | AssistKind::Generate => true,
+            AssistKind::Refactor => match other {
+                AssistKind::RefactorExtract
+                | AssistKind::RefactorInline
+                | AssistKind::RefactorRewrite => true,
+                _ => false,
+            },
+            _ => false,
+        }
+    }
+
+    pub fn name(&self) -> &str {
+        match self {
+            AssistKind::None => "None",
+            AssistKind::QuickFix => "QuickFix",
+            AssistKind::Generate => "Generate",
+            AssistKind::Refactor => "Refactor",
+            AssistKind::RefactorExtract => "RefactorExtract",
+            AssistKind::RefactorInline => "RefactorInline",
+            AssistKind::RefactorRewrite => "RefactorRewrite",
+        }
+    }
+}
+
+impl FromStr for AssistKind {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "None" => Ok(AssistKind::None),
+            "QuickFix" => Ok(AssistKind::QuickFix),
+            "Generate" => Ok(AssistKind::Generate),
+            "Refactor" => Ok(AssistKind::Refactor),
+            "RefactorExtract" => Ok(AssistKind::RefactorExtract),
+            "RefactorInline" => Ok(AssistKind::RefactorInline),
+            "RefactorRewrite" => Ok(AssistKind::RefactorRewrite),
+            unknown => Err(format!("Unknown AssistKind: '{}'", unknown)),
+        }
+    }
+}
+
+/// Unique identifier of the assist, should not be shown to the user
+/// directly.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct AssistId(pub &'static str, pub AssistKind);
+
+/// A way to control how many asssist to resolve during the assist resolution.
+/// When an assist is resolved, its edits are calculated that might be costly to always do by default.
+#[derive(Debug)]
+pub enum AssistResolveStrategy {
+    /// No assists should be resolved.
+    None,
+    /// All assists should be resolved.
+    All,
+    /// Only a certain assist should be resolved.
+    Single(SingleResolve),
+}
+
+/// Hold the [`AssistId`] data of a certain assist to resolve.
+/// The original id object cannot be used due to a `'static` lifetime
+/// and the requirement to construct this struct dynamically during the resolve handling.
+#[derive(Debug)]
+pub struct SingleResolve {
+    /// The id of the assist.
+    pub assist_id: String,
+    // The kind of the assist.
+    pub assist_kind: AssistKind,
+}
+
+impl AssistResolveStrategy {
+    pub fn should_resolve(&self, id: &AssistId) -> bool {
+        match self {
+            AssistResolveStrategy::None => false,
+            AssistResolveStrategy::All => true,
+            AssistResolveStrategy::Single(single_resolve) => {
+                single_resolve.assist_id == id.0 && single_resolve.assist_kind == id.1
+            }
+        }
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct GroupLabel(pub String);
diff --git a/crates/ide_db/src/lib.rs b/crates/ide_db/src/lib.rs
index 105607dca..2ac215c06 100644
--- a/crates/ide_db/src/lib.rs
+++ b/crates/ide_db/src/lib.rs
@@ -3,6 +3,7 @@
 //! It is mainly a `HirDatabase` for semantic analysis, plus a `SymbolsDatabase`, for fuzzy search.
 
 mod apply_change;
+pub mod assists;
 pub mod label;
 pub mod line_index;
 pub mod symbol_index;
diff --git a/crates/ide_diagnostics/Cargo.toml b/crates/ide_diagnostics/Cargo.toml
index 738fca14e..fa2adf212 100644
--- a/crates/ide_diagnostics/Cargo.toml
+++ b/crates/ide_diagnostics/Cargo.toml
@@ -22,7 +22,6 @@ text_edit = { path = "../text_edit", version = "0.0.0" }
 cfg = { path = "../cfg", version = "0.0.0" }
 hir = { path = "../hir", version = "0.0.0" }
 ide_db = { path = "../ide_db", version = "0.0.0" }
-ide_assists = { path = "../ide_assists", version = "0.0.0" }
 
 [dev-dependencies]
 expect-test = "1.1"
diff --git a/crates/ide_diagnostics/src/incorrect_case.rs b/crates/ide_diagnostics/src/incorrect_case.rs
index 04fc779ce..8e1a93aa7 100644
--- a/crates/ide_diagnostics/src/incorrect_case.rs
+++ b/crates/ide_diagnostics/src/incorrect_case.rs
@@ -1,6 +1,5 @@
 use hir::{db::AstDatabase, InFile};
-use ide_assists::Assist;
-use ide_db::base_db::FilePosition;
+use ide_db::{assists::Assist, base_db::FilePosition};
 use syntax::AstNode;
 
 use crate::{
diff --git a/crates/ide_diagnostics/src/lib.rs b/crates/ide_diagnostics/src/lib.rs
index 0d98307a2..2a16c73a8 100644
--- a/crates/ide_diagnostics/src/lib.rs
+++ b/crates/ide_diagnostics/src/lib.rs
@@ -28,6 +28,7 @@ mod field_shorthand;
 
 use hir::{diagnostics::AnyDiagnostic, Semantics};
 use ide_db::{
+    assists::{Assist, AssistId, AssistKind, AssistResolveStrategy},
     base_db::{FileId, SourceDatabase},
     label::Label,
     source_change::SourceChange,
@@ -42,8 +43,6 @@ use syntax::{
 use text_edit::TextEdit;
 use unlinked_file::UnlinkedFile;
 
-use ide_assists::{Assist, AssistId, AssistKind, AssistResolveStrategy};
-
 #[derive(Copy, Clone, Debug, PartialEq)]
 pub struct DiagnosticCode(pub &'static str);
 
@@ -265,8 +264,8 @@ fn unresolved_fix(id: &'static str, label: &str, target: TextRange) -> Assist {
 #[cfg(test)]
 mod tests {
     use expect_test::Expect;
-    use ide_assists::AssistResolveStrategy;
     use ide_db::{
+        assists::AssistResolveStrategy,
         base_db::{fixture::WithFixture, SourceDatabaseExt},
         RootDatabase,
     };
diff --git a/crates/ide_diagnostics/src/missing_fields.rs b/crates/ide_diagnostics/src/missing_fields.rs
index f242ee481..5af67f461 100644
--- a/crates/ide_diagnostics/src/missing_fields.rs
+++ b/crates/ide_diagnostics/src/missing_fields.rs
@@ -1,7 +1,6 @@
 use either::Either;
 use hir::{db::AstDatabase, InFile};
-use ide_assists::Assist;
-use ide_db::source_change::SourceChange;
+use ide_db::{assists::Assist, source_change::SourceChange};
 use stdx::format_to;
 use syntax::{algo, ast::make, AstNode, SyntaxNodePtr};
 use text_edit::TextEdit;
diff --git a/crates/ide_diagnostics/src/missing_ok_or_some_in_tail_expr.rs b/crates/ide_diagnostics/src/missing_ok_or_some_in_tail_expr.rs
index 9e36ca296..01c79b6f5 100644
--- a/crates/ide_diagnostics/src/missing_ok_or_some_in_tail_expr.rs
+++ b/crates/ide_diagnostics/src/missing_ok_or_some_in_tail_expr.rs
@@ -1,6 +1,5 @@
 use hir::db::AstDatabase;
-use ide_assists::Assist;
-use ide_db::source_change::SourceChange;
+use ide_db::{assists::Assist, source_change::SourceChange};
 use syntax::AstNode;
 use text_edit::TextEdit;
 
diff --git a/crates/ide_diagnostics/src/unresolved_module.rs b/crates/ide_diagnostics/src/unresolved_module.rs
index b11e71b3e..5aa9dae17 100644
--- a/crates/ide_diagnostics/src/unresolved_module.rs
+++ b/crates/ide_diagnostics/src/unresolved_module.rs
@@ -1,6 +1,5 @@
 use hir::db::AstDatabase;
-use ide_assists::Assist;
-use ide_db::{base_db::AnchoredPathBuf, source_change::FileSystemEdit};
+use ide_db::{assists::Assist, base_db::AnchoredPathBuf, source_change::FileSystemEdit};
 use syntax::AstNode;
 
 use crate::{fix, Diagnostic, DiagnosticsContext};