Update Layout.{width, height} on interval

src/musicplayer/ui/control.gleam

@@ -3,6 +3,7 @@ import gleam/erlang/process.{type Subject}
 import musicplayer/ui/layout.{type Section}
 
 pub type Control {
+  UpdateDimensions(width: Int, height: Int)
   UpdateState(section: Section, content: String)
 
   Exit(reply_to: Subject(Nil))

src/musicplayer/ui/internal.gleam

@@ -19,3 +19,13 @@ pub fn hide_cursor() -> Nil {
 pub fn show_cursor() -> Nil {
   io.print("\u{001B}[?25h")
 }
+
+pub type Enotsup
+
+// https://www.erlang.org/doc/apps/stdlib/io.html#rows/0
+@external(erlang, "io", "rows")
+pub fn io_get_rows() -> Result(Int, Enotsup)
+
+// https://www.erlang.org/doc/apps/stdlib/io.html#columns/0
+@external(erlang, "io", "columns")
+pub fn io_get_columns() -> Result(Int, Enotsup)

src/musicplayer/ui/layout.gleam

@@ -1,7 +1,7 @@
 import gleam/dict
 
 pub type Layout {
-  Layout(nodes: dict.Dict(Section, Node))
+  Layout(width: Int, height: Int, nodes: dict.Dict(Section, Node))
 }
 
 pub type Section {
@@ -31,7 +31,7 @@ pub fn new() -> Layout {
       #(PlaybackTime, Node(content: "00:00", x: 1, y: 2, children: [])),
     ])
 
-  Layout(nodes: nodes)
+  Layout(0, 0, nodes: nodes)
 }
 
 pub fn update_section(
@@ -42,10 +42,17 @@ pub fn update_section(
   case dict.get(layout.nodes, section) {
     Error(_) -> layout
     Ok(node) ->
-      Layout(nodes: dict.insert(
-        layout.nodes,
-        section,
-        Node(..node, content: content),
-      ))
+      Layout(
+        ..layout,
+        nodes: dict.insert(
+          layout.nodes,
+          section,
+          Node(..node, content: content),
+        ),
+      )
   }
 }
+
+pub fn update_dimensions(layout: Layout, width: Int, height: Int) -> Layout {
+  Layout(..layout, width:, height:)
+}

src/musicplayer/ui/ui.gleam

@@ -1,5 +1,6 @@
 import gleam/dict
 import gleam/erlang/process.{type Subject}
+import gleam/int
 import gleam/list
 import gleam/otp/actor
 import gleam/string
@@ -26,6 +27,11 @@ pub fn new() -> Result(Subject(Control), String) {
     Error(start_error) ->
       Error("Could not start actor: " <> string.inspect(start_error))
     Ok(actor.Started(data: ui, ..)) -> {
+      process.spawn(fn() {
+        let update_dimensions_interval_ms = 300
+        update_dimensions_on_interval(ui, update_dimensions_interval_ms)
+      })
+
       process.spawn(fn() {
         let assert Ok(_) = process.register(process.self(), redraw_name)
 
@@ -45,6 +51,22 @@ fn handle_message(
   control: Control,
 ) -> actor.Next(State(redraw, layout), Control) {
   case control {
+    control.UpdateDimensions(width, height) -> {
+      let current_dimensions = #(state.layout.width, state.layout.height)
+
+      case #(width, height) == current_dimensions {
+        True -> actor.continue(state)
+        False -> {
+
+          actor.continue(
+            State(
+              ..state,
+              layout: layout.update_dimensions(state.layout, width, height),
+            ),
+          )
+        }
+      }
+    }
     control.UpdateState(section, content) -> {
       let layout = layout.update_section(state.layout, section, content)
       let state = State(..state, layout:)
@@ -70,6 +92,18 @@ fn redraw_on_update_loop(redraw: Subject(Layout)) -> Nil {
   redraw_on_update_loop(redraw)
 }
 
+fn update_dimensions_on_interval(ui: Subject(Control), interval_ms: Int) {
+  case ui_internal.io_get_columns(), ui_internal.io_get_rows() {
+    Ok(width), Ok(height) -> {
+      process.send(ui, control.UpdateDimensions(width, height))
+    }
+    _, _ -> Nil
+  }
+
+  process.sleep(interval_ms)
+  update_dimensions_on_interval(ui, interval_ms)
+}
+
 fn render_layout(layout: Layout, from: Section) -> Nil {
   case dict.get(layout.nodes, from) {
     Error(_) -> Nil