ctl: interactive shell with history, editing and completion

`rsp ctl` opens a prompt in the spirit of bluetoothctl. Lines are parsed with
the same clap definitions as the one-shot CLI, so every command and flag works
exactly as it does from a terminal, `help <command>` included.

Tab completes subcommands, and track/album/artist paths for `play` through
`db-complete` (run out of process, keeping its 100 ms timeout away from the
input loop). History lives in the state directory. Piped input falls back to a
plain line loop, so `rsp ctl < commands` works without a terminal.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/cli.rs b/src/cli.rs
index 79c31a8..8b39519 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -104,6 +104,8 @@ pub enum Commands {
     },
     /// display lyrics
     Lyrics,
+    /// Interactive control shell (like bluetoothctl)
+    Ctl,
 }
 
 #[derive(Subcommand)]
@@ -350,6 +352,9 @@ impl Cli {
             Commands::Lyrics => {
                 let _ = crate::daemon::send_command("lyrics".to_string());
             }
+            Commands::Ctl => {
+                crate::ctl::run()?;
+            }
         }
         Ok(())
     }