Set buffer language when confirming selection in language selector

Co-Authored-By: Julia Risley <julia@zed.dev>

Cargo.lock

@@ -3290,6 +3290,7 @@ dependencies = [
 name = "language_selector"
 version = "0.1.0"
 dependencies = [
+ "anyhow",
  "editor",
  "fuzzy",
  "gpui",

crates/editor/src/editor.rs

@@ -1254,6 +1254,15 @@ impl Editor {
         self.buffer.read(cx).language_at(point, cx)
     }
 
+    pub fn active_excerpt(
+        &self,
+        cx: &AppContext,
+    ) -> Option<(ExcerptId, ModelHandle<Buffer>, Range<text::Anchor>)> {
+        self.buffer
+            .read(cx)
+            .excerpt_containing(self.selections.newest_anchor().head(), cx)
+    }
+
     fn style(&self, cx: &AppContext) -> EditorStyle {
         build_style(
             cx.global::<Settings>(),

crates/language_selector/Cargo.toml

@@ -18,3 +18,4 @@ project = { path = "../project" }
 theme = { path = "../theme" }
 settings = { path = "../settings" }
 workspace = { path = "../workspace" }
+anyhow = "1.0"

crates/language_selector/src/language_selector.rs

@@ -1,12 +1,14 @@
 use std::sync::Arc;
 
+use editor::Editor;
 use fuzzy::{match_strings, StringMatch, StringMatchCandidate};
 use gpui::{
-    actions, elements::*, AnyViewHandle, AppContext, Entity, MouseState, MutableAppContext,
+    actions, elements::*, AnyViewHandle, AppContext, Entity, ModelHandle, MouseState,
-    RenderContext, View, ViewContext, ViewHandle,
+    MutableAppContext, RenderContext, View, ViewContext, ViewHandle,
 };
-use language::LanguageRegistry;
+use language::{Buffer, LanguageRegistry};
 use picker::{Picker, PickerDelegate};
+use project::Project;
 use settings::Settings;
 use workspace::{AppState, Workspace};
 
@@ -27,32 +29,47 @@ pub enum Event {
 }
 
 pub struct LanguageSelector {
+    buffer: ModelHandle<Buffer>,
+    project: ModelHandle<Project>,
     language_registry: Arc<LanguageRegistry>,
+    candidates: Vec<StringMatchCandidate>,
     matches: Vec<StringMatch>,
     picker: ViewHandle<Picker<Self>>,
     selected_index: usize,
 }
 
 impl LanguageSelector {
-    fn new(language_registry: Arc<LanguageRegistry>, cx: &mut ViewContext<Self>) -> Self {
+    fn new(
+        buffer: ModelHandle<Buffer>,
+        project: ModelHandle<Project>,
+        language_registry: Arc<LanguageRegistry>,
+        cx: &mut ViewContext<Self>,
+    ) -> Self {
         let handle = cx.weak_handle();
         let picker = cx.add_view(|cx| Picker::new("Select Language...", handle, cx));
 
-        let mut matches = language_registry
+        let candidates = language_registry
             .language_names()
             .into_iter()
             .enumerate()
-            .map(|(candidate_id, name)| StringMatch {
+            .map(|(candidate_id, name)| StringMatchCandidate::new(candidate_id, name))
-                candidate_id,
+            .collect::<Vec<_>>();
-                score: 0.0,
+        let mut matches = candidates
+            .iter()
+            .map(|candidate| StringMatch {
+                candidate_id: candidate.id,
+                score: 0.,
                 positions: Default::default(),
-                string: name,
+                string: candidate.string.clone(),
             })
             .collect::<Vec<_>>();
         matches.sort_unstable_by(|mat1, mat2| mat1.string.cmp(&mat2.string));
 
         Self {
+            buffer,
+            project,
             language_registry,
+            candidates,
             matches,
             picker,
             selected_index: 0,
@@ -64,12 +81,19 @@ impl LanguageSelector {
         registry: Arc<LanguageRegistry>,
         cx: &mut ViewContext<Workspace>,
     ) {
-        workspace.toggle_modal(cx, |_, cx| {
+        if let Some((_, buffer, _)) = workspace
-            let this = cx.add_view(|cx| Self::new(registry, cx));
+            .active_item(cx)
+            .and_then(|active_item| active_item.act_as::<Editor>(cx))
+            .and_then(|editor| editor.read(cx).active_excerpt(cx))
+        {
+            workspace.toggle_modal(cx, |workspace, cx| {
+                let project = workspace.project().clone();
+                let this = cx.add_view(|cx| Self::new(buffer, project, registry, cx));
                 cx.subscribe(&this, Self::on_event).detach();
                 this
             });
         }
+    }
 
     fn on_event(
         workspace: &mut Workspace,
@@ -111,7 +135,21 @@ impl PickerDelegate for LanguageSelector {
     }
 
     fn confirm(&mut self, cx: &mut ViewContext<Self>) {
-        todo!();
+        if let Some(mat) = self.matches.get(self.selected_index) {
+            let language_name = &self.candidates[mat.candidate_id].string;
+            let language = self.language_registry.language_for_name(language_name);
+            cx.spawn(|this, mut cx| async move {
+                let language = language.await?;
+                this.update(&mut cx, |this, cx| {
+                    this.project.update(cx, |project, cx| {
+                        project.set_language_for_buffer(&this.buffer, language, cx);
+                    });
+                });
+                anyhow::Ok(())
+            })
+            .detach_and_log_err(cx);
+        }
+
         cx.emit(Event::Dismissed);
     }
 
@@ -123,24 +161,13 @@ impl PickerDelegate for LanguageSelector {
         self.selected_index
     }
 
-    fn set_selected_index(&mut self, ix: usize, cx: &mut ViewContext<Self>) {
+    fn set_selected_index(&mut self, ix: usize, _: &mut ViewContext<Self>) {
         self.selected_index = ix;
     }
 
     fn update_matches(&mut self, query: String, cx: &mut ViewContext<Self>) -> gpui::Task<()> {
         let background = cx.background().clone();
-        let candidates = self
+        let candidates = self.candidates.clone();
-            .language_registry
-            .language_names()
-            .into_iter()
-            .enumerate()
-            .map(|(id, name)| StringMatchCandidate {
-                id,
-                char_bag: name.as_str().into(),
-                string: name.clone(),
-            })
-            .collect::<Vec<_>>();
-
         cx.spawn(|this, mut cx| async move {
             let matches = if query.is_empty() {
                 candidates

crates/project/src/project.rs

@@ -1464,7 +1464,7 @@ impl Project {
                 })
                 .await?;
             this.update(&mut cx, |this, cx| {
-                this.assign_language_to_buffer(&buffer, cx);
+                this.detect_language_for_buffer(&buffer, cx);
                 this.register_buffer_with_language_server(&buffer, cx);
             });
             Ok(())
@@ -1531,7 +1531,7 @@ impl Project {
         })
         .detach();
 
-        self.assign_language_to_buffer(buffer, cx);
+        self.detect_language_for_buffer(buffer, cx);
         self.register_buffer_with_language_server(buffer, cx);
         cx.observe_release(buffer, |this, buffer, cx| {
             if let Some(file) = File::from_dyn(buffer.file()) {
@@ -1818,7 +1818,7 @@ impl Project {
                         }
 
                         for buffer in plain_text_buffers {
-                            project.assign_language_to_buffer(&buffer, cx);
+                            project.detect_language_for_buffer(&buffer, cx);
                             project.register_buffer_with_language_server(&buffer, cx);
                         }
 
@@ -1831,7 +1831,7 @@ impl Project {
         })
     }
 
-    fn assign_language_to_buffer(
+    fn detect_language_for_buffer(
         &mut self,
         buffer: &ModelHandle<Buffer>,
         cx: &mut ModelContext<Self>,
@@ -1843,6 +1843,16 @@ impl Project {
             .language_for_path(&full_path)
             .now_or_never()?
             .ok()?;
+        self.set_language_for_buffer(buffer, new_language, cx);
+        None
+    }
+
+    pub fn set_language_for_buffer(
+        &mut self,
+        buffer: &ModelHandle<Buffer>,
+        new_language: Arc<Language>,
+        cx: &mut ModelContext<Self>,
+    ) {
         buffer.update(cx, |buffer, cx| {
             if buffer.language().map_or(true, |old_language| {
                 !Arc::ptr_eq(old_language, &new_language)
@@ -1851,13 +1861,13 @@ impl Project {
             }
         });
 
-        let file = File::from_dyn(buffer.read(cx).file())?;
+        if let Some(file) = File::from_dyn(buffer.read(cx).file()) {
-        let worktree = file.worktree.read(cx).as_local()?;
+            if let Some(worktree) = file.worktree.read(cx).as_local() {
                 let worktree_id = worktree.id();
                 let worktree_abs_path = worktree.abs_path().clone();
                 self.start_language_server(worktree_id, worktree_abs_path, new_language, cx);
-
+            }
-        None
+        }
     }
 
     fn merge_json_value_into(source: serde_json::Value, target: &mut serde_json::Value) {
@@ -4553,7 +4563,7 @@ impl Project {
 
         for (buffer, old_path) in renamed_buffers {
             self.unregister_buffer_from_language_server(&buffer, old_path, cx);
-            self.assign_language_to_buffer(&buffer, cx);
+            self.detect_language_for_buffer(&buffer, cx);
             self.register_buffer_with_language_server(&buffer, cx);
         }
     }
@@ -5222,7 +5232,7 @@ impl Project {
                 buffer.update(cx, |buffer, cx| {
                     buffer.file_updated(Arc::new(file), cx).detach();
                 });
-                this.assign_language_to_buffer(&buffer, cx);
+                this.detect_language_for_buffer(&buffer, cx);
             }
             Ok(())
         })