Make numlock state on boot configurable

Make numlock state on boot configurable

This will expose 3 settings for numlock behavior:
1. Numlock is off on boot (this is the current default behavior)
2. Numlock is on on boot
3. Numlock will restore the state from the last boot

Fixes #369

* Address comments:

Get keyboard after create_seat called rather than returning from
create_seat.
Use constants rather than magic numbers for keypress.
Only save updated modifier state after keypresses are handled/skipped.

* Remove unused import, fold other into existing use block.

cosmic-comp-config/src/lib.rs

@@ -7,6 +7,20 @@ use std::collections::HashMap;
 pub mod input;
 pub mod workspace;
 
+#[derive(Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+pub struct KeyboardConfig {
+    /// Boot state for numlock
+    pub numlock_state: NumlockState,
+}
+
+#[derive(Copy, Clone, Debug, Default, PartialEq, Serialize, Deserialize)]
+pub enum NumlockState {
+    BootOn,
+    #[default]
+    BootOff,
+    LastBoot,
+}
+
 #[derive(Clone, Debug, PartialEq, CosmicConfigEntry)]
 #[version = 1]
 pub struct CosmicCompConfig {
@@ -15,6 +29,7 @@ pub struct CosmicCompConfig {
     pub input_touchpad: input::InputConfig,
     pub input_devices: HashMap<String, input::InputConfig>,
     pub xkb_config: XkbConfig,
+    pub keyboard_config: KeyboardConfig,
     /// Autotiling enabled
     pub autotile: bool,
     /// Determines the behavior of the autotile variable
@@ -53,6 +68,7 @@ impl Default for CosmicCompConfig {
             },
             input_devices: Default::default(),
             xkb_config: Default::default(),
+            keyboard_config: Default::default(),
             autotile: Default::default(),
             autotile_behavior: Default::default(),
             active_hint: true,

src/backend/mod.rs

@@ -1,8 +1,11 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 use crate::state::State;
-use anyhow::{Context, Result};
+use anyhow::{anyhow, Context, Result};
+use cosmic_comp_config::NumlockState;
+use smithay::backend::input::{self as smithay_input};
 use smithay::reexports::{calloop::EventLoop, wayland_server::DisplayHandle};
+use smithay::utils::SERIAL_COUNTER;
 use tracing::{info, warn};
 
 pub mod render;
@@ -58,6 +61,11 @@ pub fn init_backend_auto(
             &state.common.config,
             "seat-0".into(),
         );
+
+        let keyboard = initial_seat
+            .get_keyboard()
+            .ok_or_else(|| anyhow!("`shell::create_seat` did not setup keyboard"))?;
+
         state
             .common
             .shell
@@ -66,6 +74,44 @@ pub fn init_backend_auto(
             .seats
             .add_seat(initial_seat);
 
+        let desired_numlock = state
+            .common
+            .config
+            .cosmic_conf
+            .keyboard_config
+            .numlock_state;
+        // Restore numlock state based on config.
+        let toggle_numlock = match desired_numlock {
+            NumlockState::BootOff => keyboard.modifier_state().num_lock,
+            NumlockState::BootOn => !keyboard.modifier_state().num_lock,
+            NumlockState::LastBoot => {
+                keyboard.modifier_state().num_lock
+                    != state.common.config.dynamic_conf.numlock().last_state
+            }
+        };
+
+        // If we're enabling numlock...
+        if toggle_numlock {
+            /// Linux scancode for numlock key.
+            const NUMLOCK_SCANCODE: u32 = 69;
+            /// Offset used to convert Linux scancode to X11 keycode.
+            const X11_KEYCODE_OFFSET: u32 = 8;
+
+            let mut input = |key_state| {
+                let time = state.common.clock.now().as_millis();
+                let _ = keyboard.input(
+                    state,
+                    smithay_input::Keycode::new(NUMLOCK_SCANCODE + X11_KEYCODE_OFFSET),
+                    key_state,
+                    SERIAL_COUNTER.next_serial(),
+                    time,
+                    |_, _, _| smithay::input::keyboard::FilterResult::<()>::Forward,
+                );
+            };
+            // Press and release the numlock key to update modifiers.
+            input(smithay_input::KeyState::Pressed);
+            input(smithay_input::KeyState::Released);
+        }
         {
             {
                 state

src/config/mod.rs

@@ -12,6 +12,8 @@ use cosmic_config::{ConfigGet, CosmicConfigEntry};
 use cosmic_settings_config::window_rules::ApplicationException;
 use cosmic_settings_config::{shortcuts, window_rules, Shortcuts};
 use serde::{Deserialize, Serialize};
+use smithay::utils::{Clock, Monotonic};
+use smithay::wayland::xdg_activation::XdgActivationState;
 pub use smithay::{
     backend::input::KeyState,
     input::keyboard::{keysyms as KeySyms, Keysym, ModifiersState},
@@ -25,10 +27,6 @@ pub use smithay::{
     },
     utils::{Logical, Physical, Point, Size, Transform},
 };
-use smithay::{
-    utils::{Clock, Monotonic},
-    wayland::xdg_activation::XdgActivationState,
-};
 use std::{
     cell::RefCell,
     collections::{BTreeMap, HashMap},
@@ -46,7 +44,8 @@ mod types;
 pub use self::types::*;
 use cosmic::config::CosmicTk;
 use cosmic_comp_config::{
-    input::InputConfig, workspace::WorkspaceConfig, CosmicCompConfig, TileBehavior, XkbConfig,
+    input::InputConfig, workspace::WorkspaceConfig, CosmicCompConfig, KeyboardConfig, TileBehavior,
+    XkbConfig,
 };
 
 #[derive(Debug)]
@@ -68,6 +67,7 @@ pub struct Config {
 #[derive(Debug)]
 pub struct DynamicConfig {
     outputs: (Option<PathBuf>, OutputsConfig),
+    numlock: (Option<PathBuf>, NumlockStateConfig),
 }
 
 #[derive(Debug, Deserialize, Serialize)]
@@ -93,6 +93,11 @@ impl From<Output> for OutputInfo {
     }
 }
 
+#[derive(Default, Debug, Deserialize, Serialize)]
+pub struct NumlockStateConfig {
+    pub last_state: bool,
+}
+
 #[derive(Debug, Deserialize, Serialize, Clone, PartialEq)]
 #[serde(rename_all = "lowercase")]
 pub enum OutputState {
@@ -323,9 +328,13 @@ impl Config {
         let output_path =
             xdg.and_then(|base| base.place_state_file("cosmic-comp/outputs.ron").ok());
         let outputs = Self::load_outputs(&output_path);
+        let numlock_path =
+            xdg.and_then(|base| base.place_state_file("cosmic-comp/numlock.ron").ok());
+        let numlock = Self::load_numlock(&numlock_path);
 
         DynamicConfig {
             outputs: (output_path, outputs),
+            numlock: (numlock_path, numlock),
         }
     }
 
@@ -373,6 +382,24 @@ impl Config {
         }
     }
 
+    fn load_numlock(path: &Option<PathBuf>) -> NumlockStateConfig {
+        path.as_deref()
+            .filter(|path| path.exists())
+            .and_then(|path| {
+                ron::de::from_reader::<_, NumlockStateConfig>(
+                    OpenOptions::new().read(true).open(path).unwrap(),
+                )
+                .map_err(|err| {
+                    warn!(?err, "Failed to read numlock.ron, resetting..");
+                    if let Err(err) = std::fs::remove_file(path) {
+                        error!(?err, "Failed to remove numlock.ron.");
+                    }
+                })
+                .ok()
+            })
+            .unwrap_or_default()
+    }
+
     pub fn shortcut_for_action(&self, action: &shortcuts::Action) -> Option<String> {
         self.shortcuts.shortcut_for_action(action)
     }
@@ -639,6 +666,14 @@ impl DynamicConfig {
     pub fn outputs_mut(&mut self) -> PersistenceGuard<'_, OutputsConfig> {
         PersistenceGuard(self.outputs.0.clone(), &mut self.outputs.1)
     }
+
+    pub fn numlock(&self) -> &NumlockStateConfig {
+        &self.numlock.1
+    }
+
+    pub fn numlock_mut(&mut self) -> PersistenceGuard<'_, NumlockStateConfig> {
+        PersistenceGuard(self.numlock.0.clone(), &mut self.numlock.1)
+    }
 }
 
 fn get_config<T: Default + serde::de::DeserializeOwned>(
@@ -688,6 +723,14 @@ fn config_changed(config: cosmic_config::Config, keys: Vec<String>, state: &mut
                 state.common.atspi_ei.update_keymap(value.clone());
                 state.common.config.cosmic_conf.xkb_config = value;
             }
+            "keyboard_config" => {
+                let value = get_config::<KeyboardConfig>(&config, "keyboard_config");
+                state.common.config.cosmic_conf.keyboard_config = value;
+                let shell = state.common.shell.read().unwrap();
+                let seat = shell.seats.last_active();
+                state.common.config.dynamic_conf.numlock_mut().last_state =
+                    seat.get_keyboard().unwrap().modifier_state().num_lock;
+            }
             "input_default" => {
                 let value = get_config::<InputConfig>(&config, "input_default");
                 state.common.config.cosmic_conf.input_default = value;

src/input/mod.rs

@@ -33,7 +33,7 @@ use calloop::{
     timer::{TimeoutAction, Timer},
     RegistrationToken,
 };
-use cosmic_comp_config::workspace::WorkspaceLayout;
+use cosmic_comp_config::{workspace::WorkspaceLayout, NumlockState};
 use cosmic_settings_config::shortcuts;
 use cosmic_settings_config::shortcuts::action::{Direction, ResizeDirection};
 use smithay::{
@@ -241,6 +241,22 @@ impl State {
                         }
                         self.handle_action(action, &seat, serial, time, pattern, None, true)
                     }
+
+                    // If we want to track numlock state so it can be reused on the next boot...
+                    if let NumlockState::LastBoot =
+                        self.common.config.cosmic_conf.keyboard_config.numlock_state
+                    {
+                        // .. and the state has been updated ...
+                        if self.common.config.dynamic_conf.numlock().last_state
+                            != keyboard.modifier_state().num_lock
+                        {
+                            // ... then record the updated state.
+                            // The call to `numlock_mut` will generate a `PersistenceGuard`. The
+                            // `PersistenceGuard` will write to a file when it's dropped here.
+                            self.common.config.dynamic_conf.numlock_mut().last_state =
+                                keyboard.modifier_state().num_lock;
+                        }
+                    }
                 }
             }
 

src/shell/seats.rs

@@ -203,11 +203,12 @@ pub fn create_seat(
     // So instead of doing the right thing (and initialize these capabilities as matching
     // devices appear), we have to surrender to reality and just always expose a keyboard and pointer.
     let conf = config.xkb_config();
-    if let Err(err) = seat.add_keyboard(
+    seat.add_keyboard(
         xkb_config_to_wl(&conf),
         (conf.repeat_delay as i32).abs(),
         (conf.repeat_rate as i32).abs(),
-    ) {
+    )
+    .or_else(|err| {
         warn!(
             ?err,
             "Failed to load provided xkb config. Trying default...",
@@ -217,8 +218,8 @@ pub fn create_seat(
             (conf.repeat_delay as i32).abs(),
             (conf.repeat_rate as i32).abs(),
         )
-        .expect("Failed to load xkb configuration files");
-    }
+    })
+    .expect("Failed to load xkb configuration files");
     seat.add_pointer();
     seat.add_touch();