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, 82 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 7a4524a..13f394e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,6 +19,7 @@ dependencies = [
  "rand 0.10.1",
  "reqwest",
  "rusqlite",
+ "rustyline",
  "serde",
  "serde_json",
  "symphonia",
@@ -422,6 +423,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9"
 
 [[package]]
+name = "clipboard-win"
+version = "5.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "052af7878466feccda12ba7a6a67d019d712f296809559b47c12c8cc196d3a9a"
+dependencies = [
+ "error-code",
+]
+
+[[package]]
 name = "cmake"
 version = "0.1.58"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -667,6 +677,12 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "66b7e2430c6dff6a955451e2cfc438f09cea1965a9d6f87f7e3b90decc014099"
 
 [[package]]
+name = "endian-type"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "869b0adbda23651a9c5c0c3d270aac9fcb52e8622a8f2b17e57802d7791962f2"
+
+[[package]]
 name = "enumflags2"
 version = "0.7.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -704,6 +720,12 @@ dependencies = [
 ]
 
 [[package]]
+name = "error-code"
+version = "3.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b5343afd4a8365a643ac588dab4cf234a190c7f6c88c9f6dd6ffe00837661b7"
+
+[[package]]
 name = "event-listener"
 version = "5.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -961,6 +983,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
+name = "home"
+version = "0.5.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc627f471c528ff0c4a49e1d5e60450c8f6461dd6d10ba9dcd3a61d3dff7728d"
+dependencies = [
+ "windows-sys 0.61.2",
+]
+
+[[package]]
 name = "http"
 version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1459,6 +1490,15 @@ dependencies = [
 ]
 
 [[package]]
+name = "nibble_vec"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77a5d83df9f36fe23f0c3648c6bbb8b0298bb5f1939c8f2704431371f4b84d43"
+dependencies = [
+ "smallvec",
+]
+
+[[package]]
 name = "nix"
 version = "0.31.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1861,6 +1901,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f8dcc9c7d52a811697d2151c701e0d08956f92b0e24136cf4cf27b57a6a0d9bf"
 
 [[package]]
+name = "radix_trie"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b4431027dcd37fc2a73ef740b5f233aa805897935b8bce0195e41bbf9a3289a"
+dependencies = [
+ "endian-type",
+ "nibble_vec",
+]
+
+[[package]]
 name = "rand"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2115,6 +2165,26 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b39cdef0fa800fc44525c84ccb54a029961a8215f9619753635a9c0d2538d46d"
 
 [[package]]
+name = "rustyline"
+version = "19.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56e1d6bd81c2d5feafd2419138df9183c45a10a492c4e873b8b0acb8eb2b549e"
+dependencies = [
+ "bitflags",
+ "clipboard-win",
+ "home",
+ "libc",
+ "log",
+ "memchr",
+ "nix",
+ "radix_trie",
+ "unicode-segmentation",
+ "unicode-width",
+ "utf8parse",
+ "windows-sys 0.61.2",
+]
+
+[[package]]
 name = "ryu"
 version = "1.0.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2843,6 +2913,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6e4313cd5fcd3dad5cafa179702e2b244f760991f45397d14d4ebf38247da75"
 
 [[package]]
+name = "unicode-segmentation"
+version = "1.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c6f5d3c3b1bf09027a88a6bc961fc00497d651009560b5463668dc81b0fa87a8"
+
+[[package]]
+name = "unicode-width"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca718471876992059f251e33aafc334346ada08042b7661dd1fe313a9bced557"
+
+[[package]]
 name = "unicode-xid"
 version = "0.2.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"