On save

crates/analyzer/src/lib.rs

@@ -1,6 +1,6 @@
 pub mod transpiler;
 
-use std::path::PathBuf;
+use std::path::{Component, PathBuf};
 use std::sync::Arc;
 
 use tokio::sync::Mutex;
@@ -8,6 +8,8 @@ use tower_lsp::jsonrpc::Result;
 use tower_lsp::lsp_types::*;
 use tower_lsp::{Client, LanguageServer, LspService, Server};
 
+use crate::transpiler::transpile_file;
+
 #[derive(Debug)]
 struct Backend {
     client: Client,
@@ -19,15 +21,25 @@ impl LanguageServer for Backend {
     async fn initialize(&self, params: InitializeParams) -> Result<InitializeResult> {
         let mut res = InitializeResult::default();
 
-        res.capabilities.completion_provider = Some(CompletionOptions {
-            resolve_provider: None,
-            trigger_characters: None,
-            all_commit_characters: None,
-            work_done_progress_options: WorkDoneProgressOptions {
-                work_done_progress: None,
+        // res.capabilities.completion_provider = Some(CompletionOptions {
+        //     resolve_provider: None,
+        //     trigger_characters: None,
+        //     all_commit_characters: None,
+        //     work_done_progress_options: WorkDoneProgressOptions {
+        //         work_done_progress: None,
+        //     },
+        //     completion_item: None,
+        // });
+
+        res.capabilities.text_document_sync = Some(TextDocumentSyncCapability::Options(
+            TextDocumentSyncOptions {
+                open_close: Some(true),
+                change: Some(TextDocumentSyncKind::INCREMENTAL),
+                will_save: Some(false),
+                will_save_wait_until: Some(false),
+                save: Some(SaveOptions::default().into()),
             },
-            completion_item: None,
-        });
+        ));
 
         *self.workspace_folder.lock().await = params
             .workspace_folders
@@ -59,14 +71,24 @@ impl LanguageServer for Backend {
             .await;
     }
 
-    async fn completion(&self, _params: CompletionParams) -> Result<Option<CompletionResponse>> {
+    async fn did_save(&self, params: DidSaveTextDocumentParams) {
         self.client
             .log_message(MessageType::INFO, "getting completion")
             .await;
 
-        Ok(Some(CompletionResponse::Array(vec![
-            CompletionItem::new_simple("new".to_string(), "The new keyword".to_string()),
-        ])))
+        let input_path = params
+            .text_document
+            .uri
+            .to_file_path()
+            .expect("Invalid document path");
+
+        let output_path = from_mist_to_rust(input_path.clone());
+
+        self.client
+            .log_message(MessageType::INFO, output_path.display())
+            .await;
+
+        transpile_file(&input_path, &output_path);
     }
 
     async fn shutdown(&self) -> Result<()> {
@@ -85,3 +107,26 @@ pub async fn start() {
     });
     Server::new(stdin, stdout, socket).serve(service).await;
 }
+
+fn from_mist_to_rust(mut path: PathBuf) -> PathBuf {
+    path.set_extension("rs");
+
+    // 1. Convert path to a vector of components
+    let mut comps: Vec<Component> = path.components().collect();
+
+    // 2. Find the index of the *last* component matching "src"
+    if let Some(pos) = comps.iter().rposition(|c| c.as_os_str() == "src") {
+        // Define your replacement path
+        let replacement = std::path::Path::new(".mist/lsp");
+
+        // 3. Splice the replacement components into the original vector,
+        // replacing the single "src" component at `pos`
+        comps.splice(pos..=pos, replacement.components());
+
+        // 4. Rebuild the PathBuf from the modified components
+        comps.iter().collect()
+    } else {
+        // Return path with just the extension changed if "src" wasn't found
+        path
+    }
+}

crates/analyzer/src/transpiler.rs

@@ -75,7 +75,7 @@ fn build_dir(root: &Path, base_src: &Path, current_dir: &Path, out_dir: &Path) {
     }
 }
 
-fn transpile_file(path: &Path, output_path: &Path) {
+pub fn transpile_file(path: &Path, output_path: &Path) {
     // create parent directories
     if let Some(parent) = output_path.parent() {
         if let Err(e) = fs::create_dir_all(parent) {