diff --git a/src/app.rs b/src/app.rs
index e9e807bd..10827db7 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -73,30 +73,22 @@ fn get_arc_str (_state: &App, src: impl Language) -> Perhaps<Arc<str>> {
 }
 
 fn get_u16 (state: &App, src: impl Language) -> Perhaps<u16> {
-    if let Some(sym) = src.word()? {
-        Ok(Some(match sym {
-            ":w/sidebar"        => state.project.w_sidebar(state.editor().is_some()),
-            ":h/sample-detail"  => 6.max(state.size.h() as u16 * 3 / 9),
-            _ => return Err(format!("not a u16: {sym}").into())
-        }))
-    } else {
-        try_to_u16(src)
-    }
+    Ok(Some(match src.word()? {
+        Some(":w/sidebar") => state.project.w_sidebar(state.editor().is_some()),
+        Some(":h/sample-detail") => 6.max(state.size.h() as u16 * 3 / 9),
+        _ => return try_to_u16(src)
+    }))
 }
 
 fn get_usize (state: &App, src: impl Language) -> Perhaps<usize> {
-    if let Some(sym) = src.word()? {
-        Ok(Some(match sym {
-            ":scene-count"      => state.scenes().len(),
-            ":track-count"      => state.tracks().len(),
-            ":device-kind"      => state.dialog.device_kind().unwrap_or(0),
-            ":device-kind/next" => state.dialog.device_kind_next().unwrap_or(0),
-            ":device-kind/prev" => state.dialog.device_kind_prev().unwrap_or(0),
-            _ => return Err(format!("not usize: {sym}").into())
-        }))
-    } else {
-        try_to_usize(src)
-    }
+    Ok(Some(match src.word()? {
+        Some(":scene-count")      => state.scenes().len(),
+        Some(":track-count")      => state.tracks().len(),
+        Some(":device-kind")      => state.dialog.device_kind().unwrap_or(0),
+        Some(":device-kind/next") => state.dialog.device_kind_next().unwrap_or(0),
+        Some(":device-kind/prev") => state.dialog.device_kind_prev().unwrap_or(0),
+        _ => return try_to_usize(src)
+    }))
 }
 
 fn get_bool (state: &App, src: impl Language) -> Perhaps<bool> {
@@ -132,33 +124,37 @@ fn get_selection (state: &App, src: impl Language) -> Perhaps<Selection> {
     })).transpose()
 }
 
-fn get_color (state: &App, src: impl Language) -> Perhaps<Color> {
-    Ok(if let Some(sym) = src.word()? {
-        match sym {
-            ":color/bg" => Some(Color::Rgb(28, 32, 36)),
-            _ => return Err(format!("not a color: {sym}").into())
-        }
-    } else if let Some(expr) = src.expr()? {
+fn get_color (_state: &App, src: impl Language) -> Perhaps<Color> {
+    Ok(if let Ok(Some(expr)) = src.expr() {
         match expr.head()? {
             Some("g") => {
-                let n = try_to_u8(expr.tail())?
-                    .ok_or::<Box<dyn Error>>(format!("not gray: {expr}").into())?;
+                let n = try_to_u8(expr.tail())?.ok_or::<Box<dyn Error>>(
+                    format!("not gray: {expr}").into()
+                )?;
                 Some(Color::Rgb(n, n, n))
             },
             Some("rgb") => {
-                let r = try_to_u8(expr.tail().head())?
-                    .ok_or::<Box<dyn Error>>(format!("not red: {expr}").into())?;
-                let g = try_to_u8(expr.tail().tail().head())?
-                    .ok_or::<Box<dyn Error>>(format!("not green: {expr}").into())?;
-                let b = try_to_u8(expr.tail().tail().tail().head())?
-                    .ok_or::<Box<dyn Error>>(format!("not blue: {expr}").into())?;
+                let r = try_to_u8(expr.tail().head())?.ok_or::<Box<dyn Error>>(
+                    format!("not red: {expr}").into()
+                )?;
+                let g = try_to_u8(expr.tail().tail().head())?.ok_or::<Box<dyn Error>>(
+                    format!("not green: {expr}").into()
+                )?;
+                let b = try_to_u8(expr.tail().tail().tail().head())?.ok_or::<Box<dyn Error>>(
+                    format!("not blue: {expr}").into()
+                )?;
                 Some(Color::Rgb(r, g, b))
             },
             Some(_) => return Err(format!("not a color expression: {expr}").into()),
             None => return Err(format!("not a color expression: {expr}").into())
         }
+    } else if let Ok(Some(sym)) = src.word() {
+        match sym {
+            ":color/bg" => Some(Color::Rgb(28, 32, 36)),
+            _ => return Err(format!("not a color: {sym}").into())
+        }
     } else {
-        None
+        return Err(format!("not a color: {:?}", src.src()?).into())
     })
 }
 
diff --git a/src/app/draw.rs b/src/app/draw.rs
index 0647fe9a..a92af05b 100644
--- a/src/app/draw.rs
+++ b/src/app/draw.rs
@@ -14,7 +14,9 @@ impl View<Tui> for App {
             }
             for (index, dsl) in self.mode.view.iter().enumerate() {
                 if let Err(e) = self.interpret(to, dsl) {
-                    *self.error.write().unwrap() = Some(format!("view #{index}: {e}").into());
+                    *self.error.write().unwrap() = Some(format!(
+                        "mode {:?} view #{index}: {e}", &self.mode.name,
+                    ).into());
                     break;
                 }
             }
diff --git a/tengri b/tengri
index be98e666..ad1a514e 160000
--- a/tengri
+++ b/tengri
@@ -1 +1 @@
-Subproject commit be98e666f53eedf95618396239641ad846a772bd
+Subproject commit ad1a514eddbf3104b7631dedef786389863988bf