move assists to a separate crate

crates/ra_ide_api/src/assists.rs

@@ -1,89 +1,24 @@
-mod fill_match_arm;
+use ra_db::{FileRange, FilePosition};
 
-use ra_syntax::{
-    TextRange, SourceFile, AstNode,
-    algo::find_node_at_offset,
-};
-use ra_ide_api_light::{
-    LocalEdit,
-    assists::{
-        Assist,
-        AssistBuilder
-    }
-};
-use crate::{
-    db::RootDatabase,
-    FileId
-};
+use crate::{SourceFileEdit, SourceChange, db::RootDatabase};
 
-/// Return all the assists applicable at the given position.
-pub(crate) fn assists(
-    db: &RootDatabase,
-    file_id: FileId,
-    file: &SourceFile,
-    range: TextRange,
-) -> Vec<LocalEdit> {
-    let ctx = AssistCtx::new(db, file_id, file, range);
-    [fill_match_arm::fill_match_arm]
-        .iter()
-        .filter_map(|&assist| ctx.clone().apply(assist))
+pub(crate) fn assists(db: &RootDatabase, frange: FileRange) -> Vec<SourceChange> {
+    ra_assists::assists(db, frange)
+        .into_iter()
+        .map(|(label, action)| {
+            let file_id = frange.file_id;
+            let file_edit = SourceFileEdit {
+                file_id,
+                edit: action.edit,
+            };
+            SourceChange {
+                label: label.label,
+                source_file_edits: vec![file_edit],
+                file_system_edits: vec![],
+                cursor_position: action
+                    .cursor_position
+                    .map(|offset| FilePosition { offset, file_id }),
+            }
+        })
         .collect()
 }
-
-#[derive(Debug, Clone)]
-pub struct AssistCtx<'a> {
-    file_id: FileId,
-    source_file: &'a SourceFile,
-    db: &'a RootDatabase,
-    range: TextRange,
-    should_compute_edit: bool,
-}
-
-impl<'a> AssistCtx<'a> {
-    pub(crate) fn new(
-        db: &'a RootDatabase,
-        file_id: FileId,
-        source_file: &'a SourceFile,
-        range: TextRange,
-    ) -> AssistCtx<'a> {
-        AssistCtx {
-            source_file,
-            file_id,
-            db,
-            range,
-            should_compute_edit: false,
-        }
-    }
-
-    pub fn apply(mut self, assist: fn(AssistCtx) -> Option<Assist>) -> Option<LocalEdit> {
-        self.should_compute_edit = true;
-        match assist(self) {
-            None => None,
-            Some(Assist::Edit(e)) => Some(e),
-            Some(Assist::Applicable) => unreachable!(),
-        }
-    }
-
-    #[allow(unused)]
-    pub fn check(mut self, assist: fn(AssistCtx) -> Option<Assist>) -> bool {
-        self.should_compute_edit = false;
-        match assist(self) {
-            None => false,
-            Some(Assist::Edit(_)) => unreachable!(),
-            Some(Assist::Applicable) => true,
-        }
-    }
-
-    fn build(self, label: impl Into<String>, f: impl FnOnce(&mut AssistBuilder)) -> Option<Assist> {
-        if !self.should_compute_edit {
-            return Some(Assist::Applicable);
-        }
-        let mut edit = AssistBuilder::default();
-        f(&mut edit);
-        Some(edit.build(label))
-    }
-
-    pub(crate) fn node_at_offset<N: AstNode>(&self) -> Option<&'a N> {
-        find_node_at_offset(self.source_file.syntax(), self.range.start())
-    }
-}