diff --git a/codeless/src/extension.ts b/codeless/src/extension.ts
index 792af5a735..99cbfc78e7 100644
--- a/codeless/src/extension.ts
+++ b/codeless/src/extension.ts
@@ -1,17 +1,9 @@
 'use strict';
 import * as vscode from 'vscode';
-import {
-    LanguageClient,
-    LanguageClientOptions,
-    ServerOptions,
-    TransportKind,
-    Executable,
-    TextDocumentIdentifier,
-    Range
-} from 'vscode-languageclient';
+import * as lc from 'vscode-languageclient'
 
 
-let client: LanguageClient;
+let client: lc.LanguageClient;
 
 let uris = {
     syntaxTree: vscode.Uri.parse('libsyntax-rust://syntaxtree')
@@ -34,8 +26,7 @@ export function activate(context: vscode.ExtensionContext) {
         let request: ExtendSelectionParams = {
             textDocument: { uri: editor.document.uri.toString() },
             selections: editor.selections.map((s) => {
-                let r: Range = { start: s.start, end: s.end }
-                return r;
+                return { start: s.start, end: s.end };
             })
         }
         let response = await client.sendRequest<ExtendSelectionResult>("m/extendSelection", request)
@@ -71,26 +62,46 @@ export function deactivate(): Thenable<void> {
 }
 
 function startServer() {
-    let run: Executable = {
+    let run: lc.Executable = {
         command: "cargo",
         args: ["run", "--package", "m"],
         options: { cwd: "." }
     }
-    let serverOptions: ServerOptions = {
+    let serverOptions: lc.ServerOptions = {
         run,
         debug: run
     };
 
-    let clientOptions: LanguageClientOptions = {
+    let clientOptions: lc.LanguageClientOptions = {
         documentSelector: [{ scheme: 'file', language: 'rust' }],
     };
 
-    client = new LanguageClient(
+    client = new lc.LanguageClient(
         'm',
         'm languge server',
         serverOptions,
         clientOptions,
     );
+    client.onReady().then(() => {
+        client.onNotification(
+            new lc.NotificationType("m/publishDecorations"),
+            (params: PublishDecorationsParams) => {
+                console.log("A");
+                console.log(params.uri);
+                console.log(vscode.window.activeTextEditor.document.uri.toString());
+                console.log("B");
+
+                let editor = vscode.window.visibleTextEditors.find(
+                    (editor) => editor.document.uri.toString() == params.uri
+                )
+                if (editor == null) return;
+                setHighlights(
+                    editor,
+                    params.decorations,
+                )
+            }
+        )
+    })
     client.start();
 }
 
@@ -117,17 +128,72 @@ class TextDocumentContentProvider implements vscode.TextDocumentContentProvider
     }
 }
 
+
+const decorations = (() => {
+    const decor = (obj) => vscode.window.createTextEditorDecorationType({ color: obj })
+    return {
+        background: decor("#3F3F3F"),
+        error: vscode.window.createTextEditorDecorationType({
+            borderColor: "red",
+            borderStyle: "none none dashed none",
+        }),
+        comment: decor("#7F9F7F"),
+        string: decor("#CC9393"),
+        keyword: decor("#F0DFAF"),
+        function: decor("#93E0E3"),
+        parameter: decor("#94BFF3"),
+        builtin: decor("#DD6718"),
+        text: decor("#DCDCCC"),
+        attribute: decor("#BFEBBF"),
+        literal: decor("#DFAF8F"),
+    }
+})()
+
+function setHighlights(
+    editor: vscode.TextEditor,
+    highlihgs: Array<Decoration>
+) {
+    let byTag = {}
+    for (let tag in decorations) {
+        byTag[tag] = []
+    }
+
+    for (let d of highlihgs) {
+        if (!byTag[d.tag]) {
+            console.log(`unknown tag ${d.tag}`)
+            continue
+        }
+        byTag[d.tag].push(d.range)
+    }
+
+    for (let tag in byTag) {
+        let dec = decorations[tag]
+        let ranges = byTag[tag]
+        editor.setDecorations(dec, ranges)
+    }
+}
+
 interface SyntaxTreeParams {
-    textDocument: TextDocumentIdentifier;
+    textDocument: lc.TextDocumentIdentifier;
 }
 
 type SyntaxTreeResult = string
 
 interface ExtendSelectionParams {
-    textDocument: TextDocumentIdentifier;
-    selections: Range[];
+    textDocument: lc.TextDocumentIdentifier;
+    selections: lc.Range[];
 }
 
 interface ExtendSelectionResult {
-    selections: Range[];
+    selections: lc.Range[];
+}
+
+interface PublishDecorationsParams {
+    uri: string,
+    decorations: Decoration[],
+}
+
+interface Decoration {
+    range: lc.Range,
+    tag: string,
 }
diff --git a/crates/libanalysis/src/lib.rs b/crates/libanalysis/src/lib.rs
index 6a946a0b09..74f043a9b7 100644
--- a/crates/libanalysis/src/lib.rs
+++ b/crates/libanalysis/src/lib.rs
@@ -24,6 +24,7 @@ pub struct WorldState {
     data: Arc<WorldData>
 }
 
+#[derive(Clone, Debug)]
 pub struct World {
     data: Arc<WorldData>,
 }
@@ -119,12 +120,13 @@ impl World {
 }
 
 
-#[derive(Default)]
+#[derive(Default, Debug)]
 struct WorldData {
     mem_map: HashMap<PathBuf, Arc<String>>,
     file_map: RwLock<HashMap<PathBuf, Arc<FileData>>>,
 }
 
+#[derive(Debug)]
 struct FileData {
     text: Option<String>,
     syntax: OnceCell<ast::File>,
diff --git a/crates/server/Cargo.toml b/crates/server/Cargo.toml
index b2a7ce5b44..b5e4e19264 100644
--- a/crates/server/Cargo.toml
+++ b/crates/server/Cargo.toml
@@ -15,6 +15,7 @@ threadpool = "1.7.1"
 flexi_logger = "0.9.0"
 log = "0.4.3"
 url = "1.1.0"
+url_serde = "0.2.0"
 
 libeditor = { path = "../libeditor" }
 libanalysis = { path = "../libanalysis" }
diff --git a/crates/server/src/handlers.rs b/crates/server/src/handlers.rs
index de1fd557d2..8b7e00c928 100644
--- a/crates/server/src/handlers.rs
+++ b/crates/server/src/handlers.rs
@@ -4,7 +4,7 @@ use libanalysis::World;
 use libeditor::{self, LineIndex, LineCol, TextRange, TextUnit};
 
 use ::{
-    req, Result,
+    req::{self, Decoration}, Result,
     util::FilePath,
 };
 
@@ -51,6 +51,18 @@ pub fn publish_diagnostics(world: World, uri: Url) -> Result<req::PublishDiagnos
     Ok(req::PublishDiagnosticsParams { uri, diagnostics })
 }
 
+pub fn publish_decorations(world: World, uri: Url) -> Result<req::PublishDecorationsParams> {
+    let path = uri.file_path()?;
+    let file = world.file_syntax(&path)?;
+    let line_index = world.file_line_index(&path)?;
+    let decorations = libeditor::highlight(&file)
+        .into_iter()
+        .map(|h| Decoration {
+            range: to_vs_range(&line_index, h.range),
+            tag: h.tag,
+        }).collect();
+    Ok(req::PublishDecorationsParams { uri, decorations })
+}
 
 fn to_text_range(line_index: &LineIndex, range: Range) -> TextRange {
     TextRange::from_to(
diff --git a/crates/server/src/main.rs b/crates/server/src/main.rs
index 0e4f5f86a1..900ee555fd 100644
--- a/crates/server/src/main.rs
+++ b/crates/server/src/main.rs
@@ -12,6 +12,7 @@ extern crate threadpool;
 #[macro_use]
 extern crate log;
 extern crate url;
+extern crate url_serde;
 extern crate flexi_logger;
 extern crate libeditor;
 extern crate libanalysis;
@@ -31,7 +32,7 @@ use libanalysis::{WorldState, World};
 
 use ::{
     io::{Io, RawMsg, RawRequest},
-    handlers::{handle_syntax_tree, handle_extend_selection, publish_diagnostics},
+    handlers::{handle_syntax_tree, handle_extend_selection, publish_diagnostics, publish_decorations},
     util::{FilePath, FnBox}
 };
 
@@ -198,7 +199,7 @@ fn main_loop(
                 dispatch::handle_notification::<req::DidOpenTextDocument, _>(&mut not, |params| {
                     let path = params.text_document.file_path()?;
                     world.change_overlay(path, Some(params.text_document.text));
-                    update_diagnostics_on_threadpool(
+                    update_file_notifications_on_threadpool(
                         pool, world.snapshot(), sender.clone(), params.text_document.uri,
                     );
                     Ok(())
@@ -209,7 +210,7 @@ fn main_loop(
                         .ok_or_else(|| format_err!("empty changes"))?
                         .text;
                     world.change_overlay(path, Some(text));
-                    update_diagnostics_on_threadpool(
+                    update_file_notifications_on_threadpool(
                         pool, world.snapshot(), sender.clone(), params.text_document.uri,
                     );
                     Ok(())
@@ -254,14 +255,14 @@ fn handle_request_on_threadpool<R: req::ClientRequest>(
     })
 }
 
-fn update_diagnostics_on_threadpool(
+fn update_file_notifications_on_threadpool(
     pool: &ThreadPool,
     world: World,
     sender: Sender<Thunk>,
     uri: Url,
 ) {
     pool.execute(move || {
-        match publish_diagnostics(world, uri) {
+        match publish_diagnostics(world.clone(), uri.clone()) {
             Err(e) => {
                 error!("failed to compute diagnostics: {:?}", e)
             }
@@ -271,5 +272,15 @@ fn update_diagnostics_on_threadpool(
                 }))
             }
         }
+        match publish_decorations(world, uri) {
+            Err(e) => {
+                error!("failed to compute decortions: {:?}", e)
+            }
+            Ok(params) => {
+                sender.send(Box::new(|io: &mut Io| {
+                    dispatch::send_notification::<req::PublishDecorations>(io, params)
+                }))
+            }
+        }
     });
 }
diff --git a/crates/server/src/req.rs b/crates/server/src/req.rs
index 645a173064..480fbabcd3 100644
--- a/crates/server/src/req.rs
+++ b/crates/server/src/req.rs
@@ -1,5 +1,7 @@
 use serde::{ser::Serialize, de::DeserializeOwned};
+use url::Url;
 use languageserver_types::{TextDocumentIdentifier, Range};
+use url_serde;
 
 pub use languageserver_types::{
     request::*, notification::*,
@@ -58,3 +60,25 @@ pub struct ExtendSelectionParams {
 pub struct ExtendSelectionResult {
     pub selections: Vec<Range>,
 }
+
+pub enum PublishDecorations {}
+
+impl Notification for PublishDecorations {
+    type Params = PublishDecorationsParams;
+    const METHOD: &'static str = "m/publishDecorations";
+}
+
+#[derive(Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct PublishDecorationsParams {
+    #[serde(with = "url_serde")]
+    pub uri: Url,
+    pub decorations: Vec<Decoration>,
+}
+
+#[derive(Serialize, Debug)]
+#[serde(rename_all = "camelCase")]
+pub struct Decoration {
+    pub range: Range,
+    pub tag: &'static str
+}