Add ConfigLoaded event to IPC, option to disable built-in notification (#1829)

* feat: config reload ipc event

* cleanups

* Rename and move the new config option

* rename to ConfigLoaded and emit at connection

---------

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

9 files changed, 107 insertions, 5 deletions

diff --git a/niri-config/src/lib.rs b/niri-config/src/lib.rs
index 613aad3a..16ec6dca 100644
--- a/niri-config/src/lib.rs
+++ b/niri-config/src/lib.rs
@@ -60,6 +60,8 @@ pub struct Config {
     #[knuffel(child, default)]
     pub hotkey_overlay: HotkeyOverlay,
     #[knuffel(child, default)]
+    pub config_notification: ConfigNotification,
+    #[knuffel(child, default)]
     pub animations: Animations,
     #[knuffel(child, default)]
     pub gestures: Gestures,
@@ -1048,6 +1050,12 @@ pub struct HotkeyOverlay {
 }
 
 #[derive(knuffel::Decode, Debug, Default, Clone, Copy, PartialEq, Eq)]
+pub struct ConfigNotification {
+    #[knuffel(child)]
+    pub disable_failed: bool,
+}
+
+#[derive(knuffel::Decode, Debug, Default, Clone, Copy, PartialEq, Eq)]
 pub struct Clipboard {
     #[knuffel(child)]
     pub disable_primary: bool,
@@ -4769,6 +4777,9 @@ mod tests {
                 skip_at_startup: true,
                 hide_not_bound: false,
             },
+            config_notification: ConfigNotification {
+                disable_failed: false,
+            },
             animations: Animations {
                 off: false,
                 slowdown: FloatOrInt(
diff --git a/niri-ipc/src/lib.rs b/niri-ipc/src/lib.rs
index 737f1647..a1be86d2 100644
--- a/niri-ipc/src/lib.rs
+++ b/niri-ipc/src/lib.rs
@@ -1399,6 +1399,16 @@ pub enum Event {
         /// The new state of the overview.
         is_open: bool,
     },
+    /// The configuration was reloaded.
+    ///
+    /// You will always receive this event when connecting to the event stream, indicating the last
+    /// config load attempt.
+    ConfigLoaded {
+        /// Whether the loading failed.
+        ///
+        /// For example, the config file couldn't be parsed.
+        failed: bool,
+    },
 }
 
 impl FromStr for WorkspaceReferenceArg {
diff --git a/niri-ipc/src/state.rs b/niri-ipc/src/state.rs
index ef883021..3ba63a52 100644
--- a/niri-ipc/src/state.rs
+++ b/niri-ipc/src/state.rs
@@ -43,6 +43,9 @@ pub struct EventStreamState {
 
     /// State of the overview.
     pub overview: OverviewState,
+
+    /// State of the config.
+    pub config: ConfigState,
 }
 
 /// The workspaces state communicated over the event stream.
@@ -73,6 +76,13 @@ pub struct OverviewState {
     pub is_open: bool,
 }
 
+/// The config state communicated over the event stream.
+#[derive(Debug, Default)]
+pub struct ConfigState {
+    /// Whether the last config load attempt had failed.
+    pub failed: bool,
+}
+
 impl EventStreamStatePart for EventStreamState {
     fn replicate(&self) -> Vec<Event> {
         let mut events = Vec::new();
@@ -80,6 +90,7 @@ impl EventStreamStatePart for EventStreamState {
         events.extend(self.windows.replicate());
         events.extend(self.keyboard_layouts.replicate());
         events.extend(self.overview.replicate());
+        events.extend(self.config.replicate());
         events
     }
 
@@ -88,6 +99,7 @@ impl EventStreamStatePart for EventStreamState {
         let event = self.windows.apply(event)?;
         let event = self.keyboard_layouts.apply(event)?;
         let event = self.overview.apply(event)?;
+        let event = self.config.apply(event)?;
         Some(event)
     }
 }
@@ -244,3 +256,21 @@ impl EventStreamStatePart for OverviewState {
         None
     }
 }
+
+impl EventStreamStatePart for ConfigState {
+    fn replicate(&self) -> Vec<Event> {
+        vec![Event::ConfigLoaded {
+            failed: self.failed,
+        }]
+    }
+
+    fn apply(&mut self, event: Event) -> Option<Event> {
+        match event {
+            Event::ConfigLoaded { failed } => {
+                self.failed = failed;
+            }
+            event => return Some(event),
+        }
+        None
+    }
+}
diff --git a/src/ipc/client.rs b/src/ipc/client.rs
index 42fbbf75..094bb636 100644
--- a/src/ipc/client.rs
+++ b/src/ipc/client.rs
@@ -459,6 +459,14 @@ pub fn handle_msg(msg: Msg, json: bool) -> anyhow::Result<()> {
                     Event::OverviewOpenedOrClosed { is_open: opened } => {
                         println!("Overview toggled: {opened}");
                     }
+                    Event::ConfigLoaded { failed } => {
+                        let status = if failed {
+                            "with an error"
+                        } else {
+                            "successfully"
+                        };
+                        println!("Config loaded {status}");
+                    }
                 }
             }
         }
diff --git a/src/ipc/server.rs b/src/ipc/server.rs
index 464a2a13..051bccab 100644
--- a/src/ipc/server.rs
+++ b/src/ipc/server.rs
@@ -762,4 +762,15 @@ impl State {
         state.apply(event.clone());
         server.send_event(event);
     }
+
+    pub fn ipc_config_loaded(&mut self, failed: bool) {
+        let Some(server) = &self.niri.ipc_server else {
+            return;
+        };
+        let mut state = server.event_stream_state.borrow_mut();
+
+        let event = Event::ConfigLoaded { failed };
+        state.apply(event.clone());
+        server.send_event(event);
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index 2b3e1c5a..9654f7e9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -241,6 +241,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // Show the config error notification right away if needed.
     if config_errored {
         state.niri.config_error_notification.show();
+        state.ipc_config_loaded(true);
     } else if let Some(path) = config_created_at {
         state.niri.config_error_notification.show_created(path);
     }
diff --git a/src/ui/config_error_notification.rs b/src/ui/config_error_notification.rs
index 4e976633..20667172 100644
--- a/src/ui/config_error_notification.rs
+++ b/src/ui/config_error_notification.rs
@@ -78,6 +78,11 @@ impl ConfigErrorNotification {
     }
 
     pub fn show(&mut self) {
+        let c = self.config.borrow();
+        if c.config_notification.disable_failed {
+            return;
+        }
+
         if self.created_path.is_some() {
             self.created_path = None;
             self.buffers.borrow_mut().clear();
diff --git a/src/utils/watcher.rs b/src/utils/watcher.rs
index 4ed4c8ae..034e963a 100644
--- a/src/utils/watcher.rs
+++ b/src/utils/watcher.rs
@@ -5,7 +5,7 @@ use std::sync::mpsc;
 use std::time::{Duration, SystemTime};
 use std::{io, thread};
 
-use niri_config::ConfigPath;
+use niri_config::{Config, ConfigPath};
 use smithay::reexports::calloop::channel::SyncSender;
 
 use crate::niri::State;
@@ -137,10 +137,17 @@ pub fn setup(state: &mut State, config_path: &ConfigPath) {
     state
         .niri
         .event_loop
-        .insert_source(rx, |event, _, state| match event {
-            calloop::channel::Event::Msg(config) => state.reload_config(config),
-            calloop::channel::Event::Closed => (),
-        })
+        .insert_source(
+            rx,
+            |event: calloop::channel::Event<Result<Config, ()>>, _, state| match event {
+                calloop::channel::Event::Msg(config) => {
+                    let failed = config.is_err();
+                    state.reload_config(config);
+                    state.ipc_config_loaded(failed);
+                }
+                calloop::channel::Event::Closed => (),
+            },
+        )
         .unwrap();
 
     state.niri.config_file_watcher = Some(Watcher::new(config_path.clone(), process, tx));
diff --git a/wiki/Configuration:-Miscellaneous.md b/wiki/Configuration:-Miscellaneous.md
index 3eba0a31..f2d1010a 100644
--- a/wiki/Configuration:-Miscellaneous.md
+++ b/wiki/Configuration:-Miscellaneous.md
@@ -49,6 +49,10 @@ hotkey-overlay {
     skip-at-startup
     hide-not-bound
 }
+
+config-notification {
+    disable-failed
+}
 ```
 
 ### `spawn-at-startup`
@@ -277,3 +281,18 @@ hotkey-overlay {
 ```
 
 You can customize which binds the hotkey overlay shows using the [`hotkey-overlay-title` property](./Configuration:-Key-Bindings.md#custom-hotkey-overlay-titles).
+
+### `config-notification`
+
+<sup>Since: next release</sup>
+
+Settings for the config created/failed notification.
+
+Set the `disable-failed` flag to disable the "Failed to parse the config file" notification.
+For example, if you have a custom one.
+
+```kdl
+config-notification {
+    disable-failed
+}
+```