Add code actions on save

helix-core/src/syntax.rs

@@ -84,6 +84,8 @@ pub struct LanguageConfiguration {
     pub comment_token: Option<String>,
     pub text_width: Option<usize>,
     pub soft_wrap: Option<SoftWrap>,
+    #[serde(default)]
+    pub code_actions_on_save: Vec<String>, // List of LSP code actions to be run in order upon saving
 
     #[serde(default, skip_serializing, deserialize_with = "deserialize_lsp_config")]
     pub config: Option<serde_json::Value>,

helix-term/src/commands.rs

@@ -2745,6 +2745,22 @@ async fn make_format_callback(
     Ok(call)
 }
 
+async fn make_code_actions_on_save_callback(
+    future: impl Future<Output = Result<Vec<helix_lsp::lsp::CodeActionOrCommand>, anyhow::Error>>
+        + Send
+        + 'static,
+) -> anyhow::Result<job::Callback> {
+    let code_actions = future.await?;
+    let call: job::Callback = Callback::Editor(Box::new(move |editor: &mut Editor| {
+        log::debug!("Applying code actions on save {:?}", code_actions);
+        code_actions
+            .iter()
+            .map(|code_action| apply_code_action(editor, code_action))
+            .collect()
+    }));
+    Ok(call)
+}
+
 #[derive(PartialEq, Eq)]
 pub enum Open {
     Below,

helix-term/src/commands/lsp.rs

@@ -1,11 +1,8 @@
 use futures_util::FutureExt;
 use helix_lsp::{
     block_on,
-    lsp::{
-        self, CodeAction, CodeActionOrCommand, CodeActionTriggerKind, DiagnosticSeverity,
-        NumberOrString,
-    },
-    util::{diagnostic_to_lsp_diagnostic, lsp_range_to_range, range_to_lsp_range},
+    lsp::{self, CodeAction, CodeActionOrCommand, DiagnosticSeverity, NumberOrString},
+    util::lsp_range_to_range,
     OffsetEncoding,
 };
 use tui::{
@@ -544,31 +541,9 @@ fn action_fixes_diagnostics(action: &CodeActionOrCommand) -> bool {
 pub fn code_action(cx: &mut Context) {
     let (view, doc) = current!(cx.editor);
 
-    let language_server = language_server!(cx.editor, doc);
-
     let selection_range = doc.selection(view.id).primary();
-    let offset_encoding = language_server.offset_encoding();
 
-    let range = range_to_lsp_range(doc.text(), selection_range, offset_encoding);
-
-    let future = match language_server.code_actions(
-        doc.identifier(),
-        range,
-        // Filter and convert overlapping diagnostics
-        lsp::CodeActionContext {
-            diagnostics: doc
-                .diagnostics()
-                .iter()
-                .filter(|&diag| {
-                    selection_range
-                        .overlaps(&helix_core::Range::new(diag.range.start, diag.range.end))
-                })
-                .map(|diag| diagnostic_to_lsp_diagnostic(doc.text(), diag, offset_encoding))
-                .collect(),
-            only: None,
-            trigger_kind: Some(CodeActionTriggerKind::INVOKED),
-        },
-    ) {
+    let future = match doc.code_actions(selection_range) {
         Some(future) => future,
         None => {
             cx.editor
@@ -642,25 +617,7 @@ pub fn code_action(cx: &mut Context) {
                 // always present here
                 let code_action = code_action.unwrap();
 
-                match code_action {
-                    lsp::CodeActionOrCommand::Command(command) => {
-                        log::debug!("code action command: {:?}", command);
-                        execute_lsp_command(editor, command.clone());
-                    }
-                    lsp::CodeActionOrCommand::CodeAction(code_action) => {
-                        log::debug!("code action: {:?}", code_action);
-                        if let Some(ref workspace_edit) = code_action.edit {
-                            log::debug!("edit: {:?}", workspace_edit);
-                            let _ = apply_workspace_edit(editor, offset_encoding, workspace_edit);
-                        }
-
-                        // if code action provides both edit and command first the edit
-                        // should be applied and then the command
-                        if let Some(command) = &code_action.command {
-                            execute_lsp_command(editor, command.clone());
-                        }
-                    }
-                }
+                apply_code_action(editor, code_action);
             });
             picker.move_down(); // pre-select the first item
 
@@ -670,6 +627,34 @@ pub fn code_action(cx: &mut Context) {
     )
 }
 
+pub fn apply_code_action(editor: &mut Editor, code_action: &CodeActionOrCommand) {
+    let (_view, doc) = current!(editor);
+
+    let language_server = language_server!(editor, doc);
+
+    let offset_encoding = language_server.offset_encoding();
+
+    match code_action {
+        lsp::CodeActionOrCommand::Command(command) => {
+            log::debug!("code action command: {:?}", command);
+            execute_lsp_command(editor, command.clone());
+        }
+        lsp::CodeActionOrCommand::CodeAction(code_action) => {
+            log::debug!("code action: {:?}", code_action);
+            if let Some(ref workspace_edit) = code_action.edit {
+                log::debug!("edit: {:?}", workspace_edit);
+                let _ = apply_workspace_edit(editor, offset_encoding, workspace_edit);
+            }
+
+            // if code action provides both edit and command first the edit
+            // should be applied and then the command
+            if let Some(command) = &code_action.command {
+                execute_lsp_command(editor, command.clone());
+            }
+        }
+    }
+}
+
 impl ui::menu::Item for lsp::Command {
     type Data = ();
     fn format(&self, _data: &Self::Data) -> Row {

helix-term/src/commands/typed.rs

@@ -334,6 +334,11 @@ fn write_impl(
     let (view, doc) = current!(cx.editor);
     let path = path.map(AsRef::as_ref);
 
+    if let Some(future) = doc.code_actions_on_save() {
+        let callback = make_code_actions_on_save_callback(future);
+        jobs.add(Job::with_callback(callback).wait_before_exiting());
+    }
+
     let fmt = if editor_auto_fmt {
         doc.auto_format().map(|fmt| {
             let callback = make_format_callback(
@@ -647,6 +652,11 @@ pub fn write_all_impl(
                 return None;
             }
 
+            if let Some(future) = doc.code_actions_on_save() {
+                let callback = make_code_actions_on_save_callback(future);
+                jobs.add(Job::with_callback(callback).wait_before_exiting());
+            }
+
             // Look for a view to apply the formatting change to. If the document
             // is in the current view, just use that. Otherwise, since we don't
             // have any other metric available for better selection, just pick

helix-view/src/document.rs

@@ -8,6 +8,7 @@ use helix_core::doc_formatter::TextFormat;
 use helix_core::syntax::Highlight;
 use helix_core::text_annotations::{InlineAnnotation, TextAnnotations};
 use helix_core::Range;
+use helix_lsp::util::{diagnostic_to_lsp_diagnostic, range_to_lsp_range};
 use helix_vcs::{DiffHandle, DiffProviderRegistry};
 
 use ::parking_lot::Mutex;
@@ -457,7 +458,7 @@ where
     *mut_ref = f(mem::take(mut_ref));
 }
 
-use helix_lsp::lsp;
+use helix_lsp::lsp::{self, CodeActionTriggerKind};
 use url::Url;
 
 impl Document {
@@ -633,6 +634,88 @@ impl Document {
         Some(fut.boxed())
     }
 
+    pub fn code_actions_on_save(
+        &self,
+    ) -> Option<BoxFuture<'static, Result<Vec<helix_lsp::lsp::CodeActionOrCommand>, anyhow::Error>>>
+    {
+        let code_actions_on_save = self
+            .language_config()
+            .and_then(|c| Some(c.code_actions_on_save.clone()))?;
+
+        if code_actions_on_save.is_empty() {
+            return None;
+        }
+
+        let request = self.code_actions(self.full_range())?;
+
+        let fut = async move {
+            log::debug!("Configured code actions on save {:?}", code_actions_on_save);
+            let json = request.await?;
+            let response: Option<helix_lsp::lsp::CodeActionResponse> =
+                serde_json::from_value(json)?;
+            let mut code_actions = match response {
+                Some(value) => value,
+                None => helix_lsp::lsp::CodeActionResponse::default(),
+            };
+            log::debug!("Available code actions {:?}", code_actions);
+            code_actions.retain(|action| {
+                matches!(
+                    action,
+                    helix_lsp::lsp::CodeActionOrCommand::CodeAction(x) if x.disabled == None &&
+                        code_actions_on_save.iter().any(|a| match &x.kind {
+                            Some(kind) => kind.as_str() == a,
+                            None => false
+                    })
+                )
+            });
+            if code_actions.len() < code_actions_on_save.len() {
+                code_actions_on_save.iter().for_each(|configured_action| {
+                    if !code_actions.iter().any(|action| match action {
+                        helix_lsp::lsp::CodeActionOrCommand::CodeAction(x) => match &x.kind {
+                            Some(kind) => kind.as_str() == configured_action,
+                            None => false,
+                        },
+                        _ => false,
+                    }) {
+                        log::error!(
+                            "Configured code action on save is invalid {:?}",
+                            configured_action
+                        );
+                    }
+                })
+            }
+            return Ok(code_actions);
+        };
+        Some(fut.boxed())
+    }
+
+    pub fn code_actions(
+        &self,
+        range: Range,
+    ) -> Option<impl Future<Output = Result<serde_json::Value, helix_lsp::Error>>> {
+        let language_server = self.language_server()?;
+        let offset_encoding = language_server.offset_encoding();
+        let lsp_range = range_to_lsp_range(self.text(), range, offset_encoding);
+
+        language_server.code_actions(
+            self.identifier(),
+            lsp_range,
+            // Filter and convert overlapping diagnostics
+            lsp::CodeActionContext {
+                diagnostics: self
+                    .diagnostics()
+                    .iter()
+                    .filter(|&diag| {
+                        range.overlaps(&helix_core::Range::new(diag.range.start, diag.range.end))
+                    })
+                    .map(|diag| diagnostic_to_lsp_diagnostic(self.text(), diag, offset_encoding))
+                    .collect(),
+                only: None,
+                trigger_kind: Some(CodeActionTriggerKind::INVOKED),
+            },
+        )
+    }
+
     pub fn save<P: Into<PathBuf>>(
         &mut self,
         path: Option<P>,
@@ -1331,6 +1414,11 @@ impl Document {
         &self.text
     }
 
+    #[inline]
+    pub fn full_range(&self) -> Range {
+        Range::new(0, self.text.len_chars())
+    }
+
     #[inline]
     pub fn selection(&self, view_id: ViewId) -> &Selection {
         &self.selections[&view_id]