From 64ec278767f3639e6312e6e12e24788eccc609a9 Mon Sep 17 00:00:00 2001
From: Alexander Heldt <me@alexanderheldt.se>
Date: Sun, 16 Nov 2025 17:45:28 +0100
Subject: [PATCH] wip

---
 src/mpv/control.gleam      | 10 ++++++++--
 src/mpv/internal/key.gleam |  2 +-
 src/mpv/key.gleam          | 32 +++++++++++++++++++++++---------
 test/mpv/key_test.gleam    | 10 +++++++---
 4 files changed, 39 insertions(+), 15 deletions(-)

diff --git a/src/mpv/control.gleam b/src/mpv/control.gleam
index ad5b38d..247cb25 100644
--- a/src/mpv/control.gleam
+++ b/src/mpv/control.gleam
@@ -1,14 +1,16 @@
+import gleam/io
 import gleam/json
 import gleam/result
 import gleam/string
 
 import mpv/internal/control as internal_control
-import mpv/key.{type Key, Char}
+import mpv/key.{type Key}
 import tcp/reason.{type Reason}
 import tcp/tcp.{type Socket}
 
 pub type Control {
   TogglePlayPause
+
   Exit
 }
 
@@ -18,7 +20,7 @@ pub type ControlError {
 
 pub fn from_key(key: Key) -> Result(Control, Nil) {
   case key {
-    Char(char) -> char_control(char)
+    key.Char(char) -> char_control(char)
     _ -> Error(Nil)
   }
 }
@@ -65,6 +67,10 @@ pub fn get_playback_time(socket: Socket) -> Result(PlaybackTime, ControlError) {
   }
 }
 
+pub fn clear_screen() -> Nil {
+  io.print("\u{001B}[2J\u{001B}[H")
+}
+
 fn send_command(socket: Socket, command: json.Json) -> Result(String, Reason) {
   result.try(tcp.send(socket, json.to_string(command) <> "\n"), fn(_) {
     let timeout_ms = 10_000
diff --git a/src/mpv/internal/key.gleam b/src/mpv/internal/key.gleam
index bb8fbc1..cf1f7f9 100644
--- a/src/mpv/internal/key.gleam
+++ b/src/mpv/internal/key.gleam
@@ -10,6 +10,6 @@ pub type NotUsed
 @external(erlang, "shell", "start_interactive")
 pub fn shell_start_interactive(options: #(atom.Atom, atom.Atom)) -> NotUsed
 
-// https://www.erlang.org/doc/apps/stdlib/io.html#get_line/1
+// https://www.erlang.org/doc/apps/stdlib/io.html#get_chars/2
 @external(erlang, "io", "get_chars")
 fn io_get_chars(prompt: String, count: Int) -> String
diff --git a/src/mpv/key.gleam b/src/mpv/key.gleam
index 9ef4a1b..49a87cb 100644
--- a/src/mpv/key.gleam
+++ b/src/mpv/key.gleam
@@ -1,17 +1,17 @@
 import gleam/erlang/atom
 import gleam/list
-
 import mpv/internal/key as internal_key
 
 pub type Key {
   Char(String)
 
+  Input(String)
   Left
   Right
   Up
   Down
 
-  Continue
+  Continue(buffer: List(String))
   Unknown
 }
 
@@ -20,6 +20,9 @@ pub const esc = "\u{001B}"
 // control sequence introducer
 pub const csi = "["
 
+// input introducer
+const input_introducer = "$"
+
 pub fn from_list(l: List(String)) -> Key {
   case l {
     [e, c, "D"] if e == esc && c == csi -> Left
@@ -27,12 +30,20 @@ pub fn from_list(l: List(String)) -> Key {
     [e, c, "A"] if e == esc && c == csi -> Up
     [e, c, "B"] if e == esc && c == csi -> Down
 
-    [e, c] if e == esc && c == csi -> Continue
+    [e, c] if e == esc && c == csi -> Continue(l)
 
-    [e] if e == esc -> Continue
+    [ci] | [ci, _] if ci == input_introducer -> Continue(l)
+    [ii, cmd, tail] if ii == input_introducer -> {
+      case tail == "\r" {
+        True -> Input(cmd)
+        False -> Continue([ii, cmd <> tail])
+      }
+    }
+
+    [e] if e == esc -> Continue(l)
     [char] -> Char(char)
 
-    [] -> Continue
+    [] -> Continue([])
     _ -> Unknown
   }
 }
@@ -44,10 +55,13 @@ pub fn start_raw_shell() {
 }
 
 pub fn read_input_until_key(l: List(String)) -> Key {
-  let l = internal_key.read_input() |> list.wrap |> list.append(l, _)
-
-  case from_list(l) {
-    Continue -> read_input_until_key(l)
+  case
+    internal_key.read_input()
+    |> list.wrap
+    |> list.append(l, _)
+    |> from_list
+  {
+    Continue(l) -> read_input_until_key(l)
     k -> k
   }
 }
diff --git a/test/mpv/key_test.gleam b/test/mpv/key_test.gleam
index c291d88..0290f70 100644
--- a/test/mpv/key_test.gleam
+++ b/test/mpv/key_test.gleam
@@ -18,9 +18,13 @@ pub fn key_from_list_test() {
     TestCase([esc, csi, "C"], key.Right),
     TestCase([esc, csi, "A"], key.Up),
     TestCase([esc, csi, "B"], key.Down),
-    TestCase([esc, csi], key.Continue),
-    TestCase([esc], key.Continue),
-    TestCase([], key.Continue),
+    TestCase([esc, csi], key.Continue([esc, csi])),
+    TestCase([esc], key.Continue([esc])),
+    TestCase([], key.Continue([])),
+    TestCase(["$"], key.Continue(["$"])),
+    TestCase(["$", "a"], key.Continue(["$", "a"])),
+    TestCase(["$", "a", "b"], key.Continue(["$", "ab"])),
+    TestCase(["$", "ab", "\r"], key.Input("ab")),
   ]
 
   list.each(test_cases, fn(tc) {