feat(ipc): reload config command

docs/Controlling Ironbar.md

@@ -57,6 +57,20 @@ Responds with `ok`.
 }
 ```
 
+### `reload`
+
+Restarts the bars, reloading the config in the process.
+
+The IPC server and main GTK application are untouched.
+
+Responds with `ok`.
+
+```json
+{
+  "type": "reload"
+}
+```
+
 ### `get`
 
 Gets an [ironvar](ironvars) value.

src/ipc/commands.rs

@@ -11,12 +11,15 @@ pub enum Command {
     /// Open the GTK inspector
     Inspect,
 
+    /// Reload the config
+    Reload,
+
     /// Set an `ironvar` value.
     /// This creates it if it does not already exist, and updates it if it does.
     /// Any references to this variable are automatically and immediately updated.
     /// Keys and values can be any valid UTF-8 string.
     Set {
-        /// Variable key. Can be any valid UTF-8 string.
+        /// Variable key. Can be any alphanumeric ASCII string.
         key: Box<str>,
         /// Variable value. Can be any valid UTF-8 string.
         value: String,

src/ipc/server.rs

@@ -6,19 +6,20 @@ use crate::style::load_css;
 use crate::{read_lock, send_async, try_send, write_lock};
 use color_eyre::{Report, Result};
 use glib::Continue;
+use gtk::prelude::*;
+use gtk::Application;
 use std::fs;
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::net::{UnixListener, UnixStream};
 use tokio::spawn;
-use tokio::sync::mpsc;
+use tokio::sync::mpsc::{self, Receiver, Sender};
-use tokio::sync::mpsc::{Receiver, Sender};
 use tracing::{debug, error, info, warn};
 
 impl Ipc {
     /// Starts the IPC server on its socket.
     ///
     /// Once started, the server will begin accepting connections.
-    pub fn start(&self) {
+    pub fn start(&self, application: &Application) {
         let bridge = BridgeChannel::<Command>::new();
         let cmd_tx = bridge.create_sender();
         let (res_tx, mut res_rx) = mpsc::channel(32);
@@ -61,8 +62,9 @@ impl Ipc {
             }
         });
 
+        let application = application.clone();
         bridge.recv(move |command| {
-            let res = Self::handle_command(command);
+            let res = Self::handle_command(command, &application);
             try_send!(res_tx, res);
             Continue(true)
         });
@@ -102,12 +104,23 @@ impl Ipc {
     /// Takes an input command, runs it and returns with the appropriate response.
     ///
     /// This runs on the main thread, allowing commands to interact with GTK.
-    fn handle_command(command: Command) -> Response {
+    fn handle_command(command: Command, application: &Application) -> Response {
         match command {
             Command::Inspect => {
                 gtk::Window::set_interactive_debugging(true);
                 Response::Ok
             }
+            Command::Reload => {
+                info!("Closing existing bars");
+                let windows = application.windows();
+                for window in windows {
+                    window.close();
+                }
+
+                crate::load_interface(application);
+
+                Response::Ok
+            }
             Command::Set { key, value } => {
                 let variable_manager = get_variable_manager();
                 let mut variable_manager = write_lock!(variable_manager);

src/main.rs

@@ -102,50 +102,11 @@ fn start_ironbar() {
         cfg_if! {
             if #[cfg(feature = "ipc")] {
                 let ipc = ipc::Ipc::new();
-                ipc.start();
+                ipc.start(app);
             }
         }
 
-        let display = Display::default().map_or_else(
+        load_interface(app);
-            || {
-                let report = Report::msg("Failed to get default GTK display");
-                error!("{:?}", report);
-                exit(ExitCode::GtkDisplay as i32)
-            },
-            |display| display,
-        );
-
-        let config_res = env::var("IRONBAR_CONFIG").map_or_else(
-            |_| ConfigLoader::new("ironbar").find_and_load(),
-            ConfigLoader::load,
-        );
-
-        let mut config: Config = match config_res {
-            Ok(config) => config,
-            Err(err) => {
-                error!("{:?}", err);
-                exit(ExitCode::Config as i32)
-            }
-        };
-
-        debug!("Loaded config file");
-
-        #[cfg(feature = "ipc")]
-        if let Some(ironvars) = config.ironvar_defaults.take() {
-            let variable_manager = ironvar::get_variable_manager();
-            for (k, v) in ironvars {
-                if write_lock!(variable_manager).set(k.clone(), v).is_err() {
-                    tracing::warn!("Ignoring invalid ironvar: '{k}'");
-                }
-            }
-        }
-
-        if let Err(err) = create_bars(app, &display, &config) {
-            error!("{:?}", err);
-            exit(ExitCode::CreateBars as i32);
-        }
-
-        debug!("Created bars");
 
         let style_path = env::var("IRONBAR_CSS").ok().map_or_else(
             || {
@@ -187,6 +148,50 @@ fn start_ironbar() {
     app.run_with_args(&Vec::<&str>::new());
 }
 
+/// Loads the Ironbar config and interface.
+pub fn load_interface(app: &Application) {
+    let display = Display::default().map_or_else(
+        || {
+            let report = Report::msg("Failed to get default GTK display");
+            error!("{:?}", report);
+            exit(ExitCode::GtkDisplay as i32)
+        },
+        |display| display,
+    );
+
+    let config_res = env::var("IRONBAR_CONFIG").map_or_else(
+        |_| ConfigLoader::new("ironbar").find_and_load(),
+        ConfigLoader::load,
+    );
+
+    let mut config: Config = match config_res {
+        Ok(config) => config,
+        Err(err) => {
+            error!("{:?}", err);
+            exit(ExitCode::Config as i32)
+        }
+    };
+
+    debug!("Loaded config file");
+
+    #[cfg(feature = "ipc")]
+    if let Some(ironvars) = config.ironvar_defaults.take() {
+        let variable_manager = ironvar::get_variable_manager();
+        for (k, v) in ironvars {
+            if write_lock!(variable_manager).set(k.clone(), v).is_err() {
+                tracing::warn!("Ignoring invalid ironvar: '{k}'");
+            }
+        }
+    }
+
+    if let Err(err) = create_bars(app, &display, &config) {
+        error!("{:?}", err);
+        exit(ExitCode::CreateBars as i32);
+    }
+
+    debug!("Created bars");
+}
+
 /// Creates each of the bars across each of the (configured) outputs.
 fn create_bars(app: &Application, display: &Display, config: &Config) -> Result<()> {
     let wl = wayland::get_client();