working-but-not-columnwise

src/musicplayer.gleam

@@ -13,7 +13,7 @@ pub fn main() -> Nil {
   let input_keys_name: Name(Key) = process.new_name("input_keys")
   input.new(input_keys_name)
 
-  let assert Ok(ui) = ui.new()
+  let assert Ok(ui) = ui.new(logger)
   let assert Ok(mpv) = mpv.new()
   let assert Ok(musicplayer_pid) =
     musicplayer.new(logger, ui, mpv, input_keys_name)

src/musicplayer/musicplayer.gleam

@@ -155,6 +155,7 @@ fn update_playback_time_loop(
   interval_ms: Int,
 ) {
   process.sleep(interval_ms)
+  // TODO only update if state is playing
   update_playback_time(mpv, ui)
 
   update_playback_time_loop(mpv, ui, interval_ms)

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 +1,16 @@
 import gleam/dict
+import gleam/erlang/process.{type Subject}
+import gleam/float
+import gleam/int
+import gleam/list
+import gleam/string
+
+import musicplayer/logging/control as logging_control
+import musicplayer/logging/logging
+import musicplayer/ui/internal
 
 pub type Layout {
-  Layout(nodes: dict.Dict(Section, Node))
+  Layout(width: Int, height: Int, nodes: dict.Dict(Section, Node))
 }
 
 pub type Section {
@@ -11,8 +20,14 @@ pub type Section {
   PlaybackTime
 }
 
+/// A Nodes width and height is in percentage (of the available width/height of its parent Node)
 pub type Node {
-  Node(content: String, x: Int, y: Int, children: List(Section))
+  Node(
+    content: String,
+    width_percent: Int,
+    height_percent: Int,
+    children: List(Section),
+  )
 }
 
 pub fn new() -> Layout {
@@ -20,18 +35,29 @@ pub fn new() -> Layout {
     dict.from_list([
       #(
         Root,
-        Node(content: "", x: 0, y: 0, children: [
+        Node(content: "", width_percent: 100, height_percent: 100, children: [
-          Header,
+          // Header,
-          Search,
+          // Search,
           PlaybackTime,
         ]),
       ),
-      #(Header, Node(content: "Music Player", x: 1, y: 1, children: [])),
+      // #(
-      #(Search, Node(content: "", x: 30, y: 1, children: [])),
+      //   Header,
-      #(PlaybackTime, Node(content: "00:00", x: 1, y: 2, children: [])),
+      //   Node(content: "Music Player", width: 50, height: 10, children: []),
+      // ),
+      // #(Search, Node(content: "", width: 50, height: 10, children: [])),
+      #(
+        PlaybackTime,
+        Node(
+          content: "00:00",
+          width_percent: 50,
+          height_percent: 100,
+          children: [],
+        ),
+      ),
     ])
 
-  Layout(nodes: nodes)
+  Layout(0, 0, nodes: nodes)
 }
 
 pub fn update_section(
@@ -42,10 +68,125 @@ pub fn update_section(
   case dict.get(layout.nodes, section) {
     Error(_) -> layout
     Ok(node) ->
-      Layout(nodes: dict.insert(
+      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:)
+}
+
+pub fn render(logger: Subject(logging_control.Control), layout: Layout) -> Nil {
+  internal.clear_screen()
+  [layout.width, layout.height]
+  |> list.map(int.to_string)
+  |> string.join(" ")
+  |> string.append("layout - render: ", _)
+  |> logging.log(logger, _)
+
+  let container_width = int.to_float(layout.width)
+  let container_height = int.to_float(layout.height)
+  let container_top_left_x = 1
+  let container_top_left_y = 1
+
+  render_loop(
+    layout,
+    container_width,
+    container_height,
+    container_top_left_x,
+    container_top_left_y,
+    Root,
+    logger,
+  )
+}
+
+pub fn render_loop(
+  layout: Layout,
+  container_width: Float,
+  container_height: Float,
+  container_top_left_x: Int,
+  container_top_left_y: Int,
+  from: Section,
+  logger: Subject(logging_control.Control),
+) -> Nil {
+  let margin = 2.0
+
+  case dict.get(layout.nodes, from) {
+    Error(_) -> Nil
+    Ok(node) -> {
+      list.each(node.children, fn(child) {
+        let cw =
+          container_width
+          *. { int.to_float(node.width_percent) /. 100.0 }
+          -. margin
+          |> float.floor
+
+        let ch =
+          container_height
+          *. { int.to_float(node.height_percent) /. 100.0 }
+          -. margin
+          |> float.floor
+
+        let cx = container_top_left_x + 1
+        let cy = container_top_left_y + 1
+
+        render_loop(layout, cw, ch, cx, cy, child, logger)
+      })
+
+      logging.log(logger, "section: " <> string.inspect(from))
+      logging.log(
+        logger,
+        "container width: " <> float.to_string(container_width),
+      )
+      logging.log(
+        logger,
+        "container height: " <> float.to_string(container_height),
+      )
+
+      let width =
+        container_width
+        *. { int.to_float(node.width_percent) /. int.to_float(100) }
+        |> float.floor
+        |> float.truncate
+
+      let height =
+        container_height
+        *. { int.to_float(node.height_percent) /. int.to_float(100) }
+        |> float.floor
+        |> float.truncate
+
+      logging.log(logger, "width: " <> int.to_string(width))
+      logging.log(logger, "height: " <> int.to_string(height))
+
+      let cx = container_top_left_x
+      let cy = container_top_left_y
+      logging.log(logger, "cx: " <> int.to_string(cx))
+      logging.log(logger, "cy: " <> int.to_string(cy))
+
+      draw_box(cx, cy, width, height)
+      // Box heading
+      internal.print_at(node.content, cx, cy)
+    }
+  }
+}
+
+fn draw_box(x: Int, y: Int, width: Int, height: Int) -> Nil {
+  let box_chars = #("┌", "┐", "└", "┘", "─", "│")
+  let #(tl, tr, bl, br, h, v) = box_chars
+  internal.print_at(tl <> string.repeat(h, width - 2) <> tr, x, y)
+
+  list.range(1, height - 2)
+  |> list.each(fn(row) {
+    internal.print_at(v, x, y + row)
+    internal.print_at(v, x + width - 1, y + row)
+  })
+
+  internal.print_at(bl <> string.repeat(h, width - 2) <> br, x, y + height - 1)
+}

src/musicplayer/ui/ui.gleam

@@ -1,38 +1,51 @@
-import gleam/dict
 import gleam/erlang/process.{type Subject}
+import gleam/int
 import gleam/list
 import gleam/otp/actor
 import gleam/string
 
+import musicplayer/logging/control as logging_control
+import musicplayer/logging/logging
 import musicplayer/ui/control.{type Control}
-import musicplayer/ui/internal as ui_internal
+import musicplayer/ui/internal
-import musicplayer/ui/layout.{type Layout, type Section}
+import musicplayer/ui/layout.{type Layout}
 
 pub type State(redraw, content) {
-  State(redraw: Subject(Layout), layout: Layout)
+  State(
+    logger: Subject(logging_control.Control),
+    redraw: Subject(Layout),
+    layout: Layout,
+  )
 }
 
-pub fn new() -> Result(Subject(Control), String) {
+pub fn new(
+  logger: Subject(logging_control.Control),
+) -> Result(Subject(Control), String) {
   let redraw_name = process.new_name("redraw")
   let redraw: Subject(Layout) = process.named_subject(redraw_name)
 
   let layout = layout.new()
 
   case
-    actor.new(State(redraw, layout))
+    actor.new(State(logger, redraw, layout))
     |> actor.on_message(handle_message)
     |> actor.start
   {
     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(logger, ui, update_dimensions_interval_ms)
+      })
+
       process.spawn(fn() {
         let assert Ok(_) = process.register(process.self(), redraw_name)
 
-        ui_internal.clear_screen()
+        internal.clear_screen()
-        ui_internal.hide_cursor()
+        internal.hide_cursor()
 
-        redraw_on_update_loop(redraw)
+        redraw_loop(logger, redraw)
       })
 
       Ok(ui)
@@ -45,37 +58,62 @@ 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 -> {
+          [width, height]
+          |> list.map(int.to_string)
+          |> string.join(" ")
+          |> string.append("ui - updating dimensions: ", _)
+          |> logging.log(state.logger, _)
+
+          let layout = layout.update_dimensions(state.layout, width, height)
+
+          process.send(state.redraw, layout)
+          actor.continue(State(..state, layout:))
+        }
+      }
+    }
     control.UpdateState(section, content) -> {
       let layout = layout.update_section(state.layout, section, content)
-      let state = State(..state, layout:)
 
       actor.send(state.redraw, layout)
-      actor.continue(state)
+      actor.continue(State(..state, layout:))
     }
 
     control.Exit(reply_to) -> {
-      ui_internal.show_cursor()
+      internal.show_cursor()
       process.send(reply_to, Nil)
       actor.stop()
     }
   }
 }
 
-fn redraw_on_update_loop(redraw: Subject(Layout)) -> Nil {
+fn redraw_loop(
-  let layout = process.receive_forever(redraw)
+  logger: Subject(logging_control.Control),
+  redraw: Subject(Layout),
+) -> Nil {
+  process.receive_forever(redraw)
+  |> layout.render(logger, _)
 
-  ui_internal.clear_screen()
+  redraw_loop(logger, redraw)
-  render_layout(layout, layout.Root)
-
-  redraw_on_update_loop(redraw)
 }
 
-fn render_layout(layout: Layout, from: Section) -> Nil {
+fn update_dimensions_on_interval(
-  case dict.get(layout.nodes, from) {
+  logger: Subject(logging_control.Control),
-    Error(_) -> Nil
+  ui: Subject(Control),
-    Ok(node) -> {
+  interval_ms: Int,
-      list.each(node.children, fn(child) { render_layout(layout, child) })
+) {
-      ui_internal.print_at(node.content, node.x, node.y)
+  case internal.io_get_columns(), internal.io_get_rows() {
+    Ok(width), Ok(height) -> {
+      process.send(ui, control.UpdateDimensions(width, height))
     }
+    _, _ -> logging.log(logger, "ui - failed to update dimensions")
   }
+
+  process.sleep(interval_ms)
+  update_dimensions_on_interval(logger, ui, interval_ms)
 }

test/musicplayer/mpv/mpv_test.gleam

@@ -1,6 +1,6 @@
 import gleeunit
 
-import musicplayer/mpv/internal as control_internal
+import musicplayer/mpv/internal
 
 pub fn main() -> Nil {
   gleeunit.main()
@@ -10,6 +10,6 @@ pub fn parse_playback_time_test() {
   let json_string =
     "{\"data\":\"123.456789\",\"request_id\":0,\"error\":\"success\"}\n"
 
-  let assert Ok(data) = control_internal.parse_playback_time(json_string)
+  let assert Ok(data) = internal.parse_playback_time(json_string)
   assert data == 123.456789
 }