wip

And add the ability of other modules to listen to either
the final result (a `Key`) or tap into the input as it is read

src/input/input.gleam

@@ -0,0 +1,50 @@
+import gleam/erlang/process.{type Name, type Subject}
+
+import input/key.{type Key}
+
+/// `new` accepts a list of listeners that are composed of two subjects;
+///   - one to get the final `Key` and
+///   - one to tap the input as it is read from i/o
+/// and
+///   - a subject name that is used to create a `Subject` that other processes
+///     know they can inject a `Key` into the input with
+pub fn new(
+  ui_input_keys_name: Name(Key),
+  ui_input_stream_name: Name(List(String)),
+  input_ui_inject_name: Name(Key),
+) -> Nil {
+  let _ =
+    process.spawn(fn() {
+      let ui_input_keys: Subject(Key) =
+        process.named_subject(ui_input_keys_name)
+      let ui_input_stream: Subject(List(String)) =
+        process.named_subject(ui_input_stream_name)
+
+      let input_ui_inject_input: Subject(Key) =
+        process.named_subject(input_ui_inject_name)
+      let assert Ok(_) = process.register(process.self(), input_ui_inject_name)
+
+      read_input(ui_input_keys, ui_input_stream, input_ui_inject_input)
+    })
+
+  echo "waiting for input"
+  key.start_raw_shell()
+
+  Nil
+}
+
+fn read_input(
+  ui_input_keys: Subject(Key),
+  ui_input_stream: Subject(List(String)),
+  input_ui_inject: Subject(Key),
+) -> Nil {
+  let buffer = case process.receive(input_ui_inject, 1) {
+    Ok(key.Continue(buffer)) -> buffer
+    Ok(_) | Error(_) -> []
+  }
+
+  key.read_input_until_key(buffer, ui_input_stream)
+  |> process.send(ui_input_keys, _)
+
+  read_input(ui_input_keys, ui_input_stream, input_ui_inject)
+}

src/input/key.gleam

@@ -38,7 +38,9 @@ pub fn from_list(l: List(String)) -> Key {
     [ci] | [ci, _] if ci == input_introducer -> Continue(l)
     [ii, cmd, tail] if ii == input_introducer -> {
       case tail {
+        // Return
         "\r" -> Input(cmd)
+        // Backspace
         "\u{007F}" -> Continue([ii, string.drop_end(cmd, 1)])
         _ -> Continue([ii, cmd <> tail])
       }
@@ -60,7 +62,7 @@ pub fn start_raw_shell() {
 
 pub fn read_input_until_key(
   l: List(String),
-  tap_input: Subject(List(String)),
+  ui_input_stream: Subject(List(String)),
 ) -> Key {
   case
     internal_input.read_input()
@@ -69,8 +71,8 @@ pub fn read_input_until_key(
     |> from_list
   {
     Continue(l) -> {
-      process.send(tap_input, l)
+      process.send(ui_input_stream, l)
-      read_input_until_key(l, tap_input)
+      read_input_until_key(l, ui_input_stream)
     }
     k -> k
   }

src/mpv/control.gleam

@@ -2,16 +2,13 @@ import gleam/json
 import gleam/result
 import gleam/string
 
-import input/key.{type Key}
+import mpv/internal as internal_control
-import mpv/internal/control as internal_control
 import tcp/reason.{type Reason}
 import tcp/tcp.{type Socket}
 
 pub type Control {
   TogglePlayPause
 
-  Search
-
   Exit
 }
 
@@ -19,27 +16,6 @@ pub type ControlError {
   ControlError(details: String)
 }
 
-// TODO this should also have a context:
-// `/` in "artist list" "context will should be`control.Search`
-// `<some char>` in "create new playlist" context should be `control.Input`
-// `q` in most contexts should be `Exit`, but in a popup it should be `Close`
-pub fn from_key(key: Key) -> Result(Control, Nil) {
-  echo key
-  case key {
-    key.Char(char) -> char_control(char)
-    _ -> Error(Nil)
-  }
-}
-
-fn char_control(char: String) -> Result(Control, Nil) {
-  case char {
-    " " -> Ok(TogglePlayPause)
-    "q" -> Ok(Exit)
-    "/" -> Ok(Search)
-    _ -> Error(Nil)
-  }
-}
-
 pub fn toggle_play_pause(socket: Socket) -> Result(Nil, ControlError) {
   let command =
     json.object([#("command", json.array(["cycle", "pause"], of: json.string))])

src/mpv/mpv.gleam

@@ -1,55 +1,46 @@
-import gleam/erlang/process.{type Subject}
+import gleam/erlang/process.{type Name, type Subject}
 import gleam/float
 import gleam/otp/actor
 import gleam/result
 import gleam/string
 
-import input/key.{type Key}
+import mpv/control as mpv_control
-import mpv/control.{type Control}
 import tcp/reason
 import tcp/tcp.{type Socket}
+import ui/control as ui_control
 
-type State(socket, inject_input, tap_input, exit) {
+type State(socket, mpv_ui, ui_mpv) {
   State(
     socket: Socket,
-    inject_input: Subject(Key),
+    mpv_ui: Subject(ui_control.Control),
-    tap_input: Subject(List(String)),
+    ui_mpv: Subject(mpv_control.Control),
-    exit: Subject(Nil),
   )
 }
 
-pub fn new(exit: Subject(Nil)) -> Result(Nil, String) {
+pub fn new(
+  mpv_ui_name: Name(ui_control.Control),
+  ui_mpv_name: Name(mpv_control.Control),
+) -> Result(Nil, String) {
   // TODO start up mvp here, currently hi-jacking `naviterm`s socket
   let socket_path = "/tmp/naviterm_mpv"
 
+  let mpv_ui: Subject(ui_control.Control) = process.named_subject(mpv_ui_name)
+  let ui_mpv: Subject(mpv_control.Control) = process.named_subject(ui_mpv_name)
+
   case tcp.connect(socket_path) {
     Error(r) -> Error("Could not connect to mpv: " <> reason.to_string(r))
     Ok(socket) -> {
-      // `inject_input` is created by name to allow the process that
-      // owns `read_input` to be able to register it, while the agent
-      // also have a reference to it to be able to inject input
-      let inject_input_name = process.new_name("inject_input")
-      let inject_input = process.named_subject(inject_input_name)
-
-      let tap_input_name = process.new_name("tap_input")
-      let tap_input = process.named_subject(tap_input_name)
-
       case
-        actor.new(State(socket, inject_input, tap_input, exit))
+        actor.new(State(socket, mpv_ui, ui_mpv))
         |> actor.on_message(handle_message)
         |> actor.start
       {
         Error(start_error) ->
           Error("Could not start actor: " <> string.inspect(start_error))
-        Ok(actor.Started(data:, ..)) -> {
+        Ok(actor.Started(data: mpv, ..)) -> {
-          echo "waiting for input"
-          key.start_raw_shell()
-
           process.spawn(fn() {
-            let assert Ok(_) =
+            let assert Ok(_) = process.register(process.self(), ui_mpv_name)
-              process.register(process.self(), inject_input_name)
+            handle_ui_control(mpv, ui_mpv)
-
-            read_input(data, inject_input, tap_input)
           })
 
           Ok(Nil)
@@ -60,55 +51,41 @@ pub fn new(exit: Subject(Nil)) -> Result(Nil, String) {
 }
 
 fn handle_message(
-  state: State(socket, inject, input_output, exit),
+  state: State(socket, mpv_ui, ui_mpv),
-  control: Control,
+  control: mpv_control.Control,
-) -> actor.Next(State(socket, inject, input_output, exit), Control) {
+) -> actor.Next(State(socket, mpv_ui, ui_mpv), mpv_control.Control) {
   case control {
-    control.Search -> {
+    mpv_control.TogglePlayPause -> {
-      process.send(state.inject_input, key.Continue([key.input_introducer]))
-      actor.continue(state)
-    }
-    control.TogglePlayPause -> {
       echo "toggling play/pause"
 
       let _ =
-        result.map_error(control.toggle_play_pause(state.socket), fn(err) {
+        result.map_error(mpv_control.toggle_play_pause(state.socket), fn(err) {
           echo "Could not toggle play/pause: " <> err.details
         })
 
       let _ =
-        result.map(control.get_playback_time(state.socket), fn(playback) {
+        result.map(mpv_control.get_playback_time(state.socket), fn(playback) {
           echo "playback: " <> float.to_string(playback.data)
         })
 
+      process.send(state.mpv_ui, ui_control.Ack)
+
       actor.continue(state)
     }
-    control.Exit -> {
+    mpv_control.Exit -> {
-      process.send(state.exit, Nil)
+      // TODO close sockets
       actor.stop()
     }
   }
 }
 
-/// `read_input` operates by reading from input until a `Key` can be created.
+fn handle_ui_control(
-/// It is possible to create a `Key` without the users input by sending
+  mpv: Subject(mpv_control.Control),
-/// messages to `inject_input` which will initialize the "input to key" sequence.
+  ui_mpv: Subject(mpv_control.Control),
-/// This is useful to ultimately create a `Control` without the user having to
+) {
-/// input all of the character(s) needed.
+  let control = process.receive_forever(ui_mpv)
-fn read_input(
+  echo "handle_ui_control: " <> string.inspect(control)
-  subject: Subject(Control),
+  process.send(mpv, control)
-  inject_input: Subject(Key),
-  tap_input: Subject(List(String)),
-) -> Nil {
-  let buffer = case process.receive(inject_input, 1) {
-    Ok(key.Continue(buffer)) -> buffer
-    Ok(_) | Error(_) -> []
-  }
 
-  let _ =
+  handle_ui_control(mpv, ui_mpv)
-    key.read_input_until_key(buffer, tap_input)
-    |> control.from_key
-    |> result.map(process.send(subject, _))
-
-  read_input(subject, inject_input, tap_input)
 }

src/musicplayer.gleam

@@ -1,8 +1,45 @@
-import gleam/erlang/process
+import gleam/erlang/process.{type Name}
+
+import input/input
+import input/key.{type Key}
+import mpv/control as mpv_control
 import mpv/mpv
+import ui/control as ui_control
+import ui/ui
 
 pub fn main() -> Nil {
   let exit = process.new_subject()
-  let assert Ok(_) = mpv.new(exit)
+
+  // `ui_input_keys` is owned by `ui`, this is where input sends keys
+  let ui_input_keys_name: Name(Key) = process.new_name("ui_input_keys")
+  // `ui_input_stream` is owned by `ui`, thi sis where input is streamed
+  let ui_input_stream_name: Name(List(String)) =
+    process.new_name("ui_input_stream")
+
+  // `inject_input` is created by name to allow the `input` process that
+  // owns `read_input` to be able to register and receive from it,
+  //  while the any other processes can use the name reference to
+  // inject input
+
+  // `input_ui_inject`  is owned by `input`, this is where `ui` injects `Key`
+  let input_ui_inject_name: Name(Key) = process.new_name("input_ui_inject_keys")
+
+  // `ui_mpv` is owned by `ui`, this is where `ui` asks `mpv` for things
+  let ui_mpv_name: Name(mpv_control.Control) = process.new_name("ui_mpv")
+  //   `mpv_ui` is owned by mpv and this is where mpv responds to ui
+  let mpv_ui_name: Name(ui_control.Control) = process.new_name("mpv_ui")
+
+  let assert Ok(_) =
+    ui.new(
+      ui_mpv_name,
+      mpv_ui_name,
+      ui_input_keys_name,
+      ui_input_stream_name,
+      exit,
+    )
+
+  let assert Ok(_) = mpv.new(mpv_ui_name, ui_mpv_name)
+  input.new(ui_input_keys_name, ui_input_stream_name, input_ui_inject_name)
+
   process.receive_forever(exit)
 }

src/ui/control.gleam

@@ -0,0 +1,24 @@
+import input/key.{type Key}
+
+pub type Control {
+  Ack
+
+  TogglePlayPause
+
+  Exit
+}
+
+pub fn from_key(key: Key) -> Result(Control, Nil) {
+  case key {
+    key.Char(char) -> char_control(char)
+    _ -> Error(Nil)
+  }
+}
+
+fn char_control(char: String) -> Result(Control, Nil) {
+  case char {
+    " " -> Ok(TogglePlayPause)
+    "q" -> Ok(Exit)
+    _ -> Error(Nil)
+  }
+}

src/ui/ui.gleam

@@ -0,0 +1,122 @@
+import gleam/erlang/process.{type Name, type Subject}
+import gleam/otp/actor
+import gleam/result
+import gleam/string
+
+import input/key.{type Key}
+import mpv/control as mpv_control
+import ui/control as ui_control
+
+pub type State(ui_mpv, mpv_ui, ui_input_keys, ui_input_stream, exit) {
+  State(
+    ui_mpv: Subject(mpv_control.Control),
+    mpv_ui: Subject(ui_control.Control),
+    ui_input_keys: Subject(Key),
+    ui_input_stream: Subject(List(String)),
+    exit: Subject(Nil),
+  )
+}
+
+pub fn new(
+  ui_mpv_name: Name(mpv_control.Control),
+  mpv_ui_name: Name(ui_control.Control),
+  ui_input_keys_name: Name(Key),
+  ui_input_stream_name: Name(List(String)),
+  exit: Subject(Nil),
+) -> Result(Nil, String) {
+  let ui_mpv: Subject(mpv_control.Control) = process.named_subject(ui_mpv_name)
+  let mpv_ui: Subject(ui_control.Control) = process.named_subject(mpv_ui_name)
+
+  let ui_input_keys: Subject(Key) = process.named_subject(ui_input_keys_name)
+  let ui_input_stream: Subject(List(String)) =
+    process.named_subject(ui_input_stream_name)
+
+  case
+    actor.new(State(ui_mpv, mpv_ui, ui_input_keys, ui_input_stream, exit))
+    |> actor.on_message(handle_message)
+    |> actor.start
+  {
+    Error(start_error) ->
+      Error("Could not start ui: " <> string.inspect(start_error))
+    Ok(actor.Started(data: ui, ..)) -> {
+      echo "ui started"
+
+      process.spawn(fn() {
+        let assert Ok(_) = process.register(process.self(), ui_input_keys_name)
+        handle_key(ui, ui_input_keys)
+      })
+
+      process.spawn(fn() {
+        let assert Ok(_) = process.register(process.self(), mpv_ui_name)
+        handle_mpv_control(ui, mpv_ui)
+      })
+
+      process.spawn(fn() {
+        let assert Ok(_) =
+          process.register(process.self(), ui_input_stream_name)
+        temp_input_stream(ui_input_stream)
+      })
+
+      Ok(Nil)
+    }
+  }
+}
+
+fn handle_message(
+  state: State(ui_mpv, mpv_ui, ui_input_keys, ui_input_stream, exit),
+  control: ui_control.Control,
+) -> actor.Next(
+  State(ui_mpv, mpv_ui, ui_input_keys, ui_input_stream, exit),
+  ui_control.Control,
+) {
+  case control {
+    ui_control.Ack -> {
+      echo "ack! use this to re-render?"
+      actor.continue(state)
+    }
+    ui_control.TogglePlayPause -> {
+      process.send(state.mpv_ui, ui_control.TogglePlayPause)
+      case process.receive(state.mpv_ui, 5000) {
+        Error(_) -> echo "mpv not responding: could not toggle pause :("
+        Ok(_) -> echo "toggled pause"
+      }
+
+      actor.continue(state)
+    }
+    ui_control.Exit -> {
+      // TODO call `mpv` to exit, wait for response
+      process.send(state.exit, Nil)
+      actor.stop()
+    }
+  }
+}
+
+/// `handle_key` listens to a subject onto which `input` will send messages with
+/// parsed `Key`s which will be mapped to `Control`s (if possible)
+fn handle_key(
+  ui: Subject(ui_control.Control),
+  ui_input_keys: Subject(Key),
+) -> Nil {
+  let _ =
+    process.receive_forever(ui_input_keys)
+    |> ui_control.from_key
+    |> result.map(process.send(ui, _))
+
+  handle_key(ui, ui_input_keys)
+}
+
+fn handle_mpv_control(
+  ui: Subject(ui_control.Control),
+  mpv_ui: Subject(ui_control.Control),
+) {
+  let control = process.receive_forever(mpv_ui)
+  process.send(ui, control)
+
+  handle_mpv_control(ui, mpv_ui)
+}
+
+fn temp_input_stream(ui_input_stream: Subject(List(String))) -> Nil {
+  let stream = process.receive_forever(ui_input_stream)
+  echo "input stream: " <> string.inspect(stream)
+  temp_input_stream(ui_input_stream)
+}

test/input/input_test.gleam

@@ -30,6 +30,7 @@ pub fn key_from_list_test() {
     TestCase([ii], key.Continue([ii])),
     TestCase([ii, "a"], key.Continue([ii, "a"])),
     TestCase([ii, "a", "b"], key.Continue([ii, "ab"])),
+    TestCase([ii, "ab", "\u{007F}"], key.Continue([ii, "a"])),
     TestCase([ii, "ab", "\r"], key.Input("ab")),
   ]
 

test/mpv/control_test.gleam

@@ -1,29 +1,11 @@
-import gleam/list
 import gleeunit
 
-import input/key.{type Key, Char}
+import mpv/internal as control_internal
-import mpv/control.{type Control}
-import mpv/internal/control as control_internal
 
 pub fn main() -> Nil {
   gleeunit.main()
 }
 
-type TestCase {
-  TestCase(key: Key, expected: Result(Control, Nil))
-}
-
-pub fn control_from_key_test() {
-  let test_cases = [
-    TestCase(Char(" "), Ok(control.TogglePlayPause)),
-    TestCase(Char("q"), Ok(control.Exit)),
-  ]
-
-  list.each(test_cases, fn(tc) {
-    assert tc.expected == control.from_key(tc.key)
-  })
-}
-
 pub fn parse_playback_time_test() {
   let json_string =
     "{\"data\":\"123.456789\",\"request_id\":0,\"error\":\"success\"}\n"

test/ui/ui_test.gleam

@@ -0,0 +1,24 @@
+import gleam/list
+import gleeunit
+
+import input/key.{type Key, Char}
+import ui/control.{type Control}
+
+pub fn main() -> Nil {
+  gleeunit.main()
+}
+
+type TestCase {
+  TestCase(key: Key, expected: Result(Control, Nil))
+}
+
+pub fn control_from_key_test() {
+  let test_cases = [
+    TestCase(Char(" "), Ok(control.TogglePlayPause)),
+    TestCase(Char("q"), Ok(control.Exit)),
+  ]
+
+  list.each(test_cases, fn(tc) {
+    assert tc.expected == control.from_key(tc.key)
+  })
+}