zed: Add automatic language detection for pasted code

assets/settings/default.json

@@ -299,6 +299,11 @@
   //
   // Default: split
   "diff_view_style": "split",
+  // Whether to automatically detect the language of pasted code
+  // in Plain Text buffers using tree-sitter grammar scoring.
+  //
+  // Default: true
+  "auto_detect_language": true,
   // Show method signatures in the editor, when inside parentheses.
   "auto_signature_help": false,
   // Whether to show the signature help after completion or a bracket pair inserted.

crates/editor/src/editor_settings.rs

@@ -60,6 +60,7 @@ pub struct EditorSettings {
     pub completion_menu_scrollbar: ShowScrollbar,
     pub completion_detail_alignment: CompletionDetailAlignment,
     pub diff_view_style: DiffViewStyle,
+    pub auto_detect_language: bool,
 }
 #[derive(Debug, Clone)]
 pub struct Jupyter {
@@ -297,6 +298,7 @@ impl Settings for EditorSettings {
             completion_menu_scrollbar: editor.completion_menu_scrollbar.map(Into::into).unwrap(),
             completion_detail_alignment: editor.completion_detail_alignment.unwrap(),
             diff_view_style: editor.diff_view_style.unwrap(),
+            auto_detect_language: editor.auto_detect_language.unwrap(),
         }
     }
 }

crates/settings/src/vscode_import.rs

@@ -308,6 +308,7 @@ impl VsCodeSettings {
             completion_menu_scrollbar: None,
             completion_detail_alignment: None,
             diff_view_style: None,
+            auto_detect_language: None,
         }
     }
 

crates/settings_content/src/editor.rs

@@ -226,6 +226,12 @@ pub struct EditorSettingsContent {
     ///
     /// Default: split
     pub diff_view_style: Option<DiffViewStyle>,
+
+    /// Whether to automatically detect the language of pasted code
+    /// in Plain Text buffers using tree-sitter grammar scoring.
+    ///
+    /// Default: true
+    pub auto_detect_language: Option<bool>,
 }
 
 #[derive(

crates/zed/Cargo.toml

@@ -148,6 +148,8 @@ language_tools.workspace = true
 languages = { workspace = true, features = ["load-grammars"] }
 line_ending_selector.workspace = true
 log.workspace = true
+grammars = { workspace = true, features = ["load-grammars"] }
+tree-sitter.workspace = true
 markdown.workspace = true
 markdown_preview.workspace = true
 menu.workspace = true

crates/zed/src/main.rs

@@ -693,6 +693,7 @@ fn main() {
         load_embedded_fonts(cx);
 
         editor::init(cx);
+        zed::language_detection::init(cx);
         image_viewer::init(cx);
         repl::notebook::init(cx);
         diagnostics::init(cx);

crates/zed/src/zed.rs

@@ -1,5 +1,6 @@
 mod app_menus;
 pub mod edit_prediction_registry;
+pub mod language_detection;
 #[cfg(target_os = "macos")]
 pub(crate) mod mac_only_instance;
 mod migrate;