Add suspend key handling

Cargo.lock

@@ -1109,6 +1109,16 @@ version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
+[[package]]
+name = "logind-zbus"
+version = "3.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c07a2542f6e91ea92780158654852190edb2ba0b232d9d00d649d0c691cb7eb3"
+dependencies = [
+ "serde",
+ "zbus",
+]
+
 [[package]]
 name = "loom"
 version = "0.5.6"
@@ -1240,6 +1250,7 @@ dependencies = [
  "directories",
  "image",
  "keyframe",
+ "logind-zbus",
  "profiling",
  "sd-notify",
  "smithay",

Cargo.toml

@@ -13,6 +13,7 @@ clap = { version = "4.3.21", features = ["derive"] }
 directories = "5.0.1"
 image = { version = "0.24.7", default-features = false, features = ["png"] }
 keyframe = { version = "1.1.1", default-features = false }
+logind-zbus = "3.1.2"
 profiling = "1.0.9"
 sd-notify = "0.4.1"
 smithay-drm-extras = { version = "0.1.0", path = "../smithay/smithay-drm-extras" }

src/input.rs

@@ -24,6 +24,7 @@ enum Action {
     None,
     Quit,
     ChangeVt(i32),
+    Suspend,
     Spawn(String),
     Screenshot,
     CloseWindow,
@@ -57,6 +58,7 @@ enum Action {
 pub enum BackendAction {
     None,
     ChangeVt(i32),
+    Suspend,
     Screenshot,
 }
 
@@ -78,9 +80,15 @@ fn action(comp_mod: CompositorMod, keysym: KeysymHandle, mods: ModifiersState) -
     use keysyms::*;
 
     let modified = keysym.modified_sym();
-    if matches!(modified, KEY_XF86Switch_VT_1..=KEY_XF86Switch_VT_12) {
-        let vt = (modified - KEY_XF86Switch_VT_1 + 1) as i32;
-        return Action::ChangeVt(vt);
+
+    #[allow(non_upper_case_globals)] // wat
+    match modified {
+        modified @ KEY_XF86Switch_VT_1..=KEY_XF86Switch_VT_12 => {
+            let vt = (modified - KEY_XF86Switch_VT_1 + 1) as i32;
+            return Action::ChangeVt(vt);
+        }
+        KEY_XF86PowerOff => return Action::Suspend,
+        _ => (),
     }
 
     let mod_down = match comp_mod {
@@ -182,6 +190,9 @@ impl Niri {
                         Action::ChangeVt(vt) => {
                             return BackendAction::ChangeVt(vt);
                         }
+                        Action::Suspend => {
+                            return BackendAction::Suspend;
+                        }
                         Action::Spawn(command) => {
                             if let Err(err) = Command::new(command).spawn() {
                                 warn!("error spawning alacritty: {err}");

src/tty.rs

@@ -3,7 +3,7 @@ use std::os::fd::FromRawFd;
 use std::path::{Path, PathBuf};
 use std::time::Duration;
 
-use anyhow::anyhow;
+use anyhow::{anyhow, Context};
 use smithay::backend::allocator::dmabuf::Dmabuf;
 use smithay::backend::allocator::gbm::{GbmAllocator, GbmBufferFlags, GbmDevice};
 use smithay::backend::allocator::{Format as DrmFormat, Fourcc};
@@ -179,6 +179,11 @@ impl Tty {
                 match niri.process_input_event(CompositorMod::Super, event) {
                     BackendAction::None => (),
                     BackendAction::ChangeVt(vt) => tty.change_vt(vt),
+                    BackendAction::Suspend => {
+                        if let Err(err) = suspend() {
+                            warn!("error suspending: {err:?}");
+                        }
+                    }
                     BackendAction::Screenshot => {
                         let active = niri.monitor_set.active_output().cloned();
                         if let Some(active) = active {
@@ -609,3 +614,10 @@ fn refresh_interval(mode: DrmMode) -> Duration {
     let refresh_interval = (numerator + denominator / 2) / denominator;
     Duration::from_nanos(refresh_interval)
 }
+
+fn suspend() -> anyhow::Result<()> {
+    let conn = zbus::blocking::Connection::system().context("error connecting to system bus")?;
+    let manager = logind_zbus::manager::ManagerProxyBlocking::new(&conn)
+        .context("error creating login manager proxy")?;
+    manager.suspend(true).context("error suspending")
+}

src/winit.rs

@@ -149,6 +149,7 @@ impl Winit {
                     match niri.process_input_event(CompositorMod::Alt, event) {
                         BackendAction::None => (),
                         BackendAction::ChangeVt(_) => (),
+                        BackendAction::Suspend => (),
                         BackendAction::Screenshot => {
                             let active = niri.monitor_set.active_output().cloned();
                             if let Some(active) = active {