`niri_ipc::Socket`; `niri msg version`; version checking on IPC (#278)

* Implement version checking in IPC

implement version checking; streamed IPC

streamed IPC will allow multiple requests per connection

add nonsense request

change inline struct to json macro

only check version if request actually fails

fix usage of inspect_err (MSRV 1.72.0; stabilized 1.76.0)

"nonsense request" -> "return error"

oneshot connections

* Change some things around

* Unqualify niri_ipc::Transform

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/cli.rs b/src/cli.rs
index 1a1b3eb9..78f9fc0e 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -52,6 +52,8 @@ pub enum Sub {
 
 #[derive(Subcommand)]
 pub enum Msg {
+    /// Print the version of the running niri instance.
+    Version,
     /// List connected outputs.
     Outputs,
     /// Print information about the focused window.
@@ -61,4 +63,6 @@ pub enum Msg {
         #[command(subcommand)]
         action: Action,
     },
+    /// Request an error from the running niri instance.
+    RequestError,
 }