diff --git a/swayr/src/shared/cfg.rs b/swayr/src/shared/cfg.rs
index 428c644..5985710 100644
--- a/swayr/src/shared/cfg.rs
+++ b/swayr/src/shared/cfg.rs
@@ -87,6 +87,9 @@ where
             .arg("Thanks!")
             .spawn()
             .ok();
+        log::debug!("Created new config in {}.", path.to_string_lossy());
+    } else {
+        log::debug!("Loaded config from {}.", path.to_string_lossy());
     }
     let mut file = OpenOptions::new()
         .read(true)
@@ -96,5 +99,12 @@ where
         .unwrap();
     let mut buf: String = String::new();
     file.read_to_string(&mut buf).unwrap();
-    toml::from_str::<T>(&buf).expect("Invalid config.")
+    match toml::from_str::<T>(&buf) {
+        Ok(cfg) => cfg,
+        Err(err) => {
+            log::error!("Invalid config: {}", err);
+            log::error!("Using default configuration.");
+            T::default()
+        }
+    }
 }
diff --git a/swayr/src/shared/fmt.rs b/swayr/src/shared/fmt.rs
index 4616aa1..f317069 100644
--- a/swayr/src/shared/fmt.rs
+++ b/swayr/src/shared/fmt.rs
@@ -22,6 +22,7 @@ use std::fmt;
 
 pub enum FmtArg {
     I64(i64),
+    I32(i32),
     F64(f64),
     F32(f32),
     String(String),
@@ -33,6 +34,12 @@ impl From<i64> for FmtArg {
     }
 }
 
+impl From<i32> for FmtArg {
+    fn from(x: i32) -> FmtArg {
+        FmtArg::I32(x)
+    }
+}
+
 impl From<f64> for FmtArg {
     fn from(x: f64) -> FmtArg {
         FmtArg::F64(x)
@@ -62,6 +69,7 @@ impl ToString for FmtArg {
         match self {
             FmtArg::String(x) => x.clone(),
             FmtArg::I64(x) => x.to_string(),
+            FmtArg::I32(x) => x.to_string(),
             FmtArg::F64(x) => x.to_string(),
             FmtArg::F32(x) => x.to_string(),
         }
@@ -77,6 +85,7 @@ impl FormatArgument for FmtArg {
         match self {
             Self::String(val) => fmt::Display::fmt(&val, f),
             Self::I64(val) => fmt::Display::fmt(&val, f),
+            Self::I32(val) => fmt::Display::fmt(&val, f),
             Self::F64(val) => fmt::Display::fmt(&val, f),
             Self::F32(val) => fmt::Display::fmt(&val, f),
         }
diff --git a/swayrbar/src/bar.rs b/swayrbar/src/bar.rs
index 1d4da55..ffcbc7c 100644
--- a/swayrbar/src/bar.rs
+++ b/swayrbar/src/bar.rs
@@ -101,7 +101,10 @@ fn handle_click(
     for m in mods.iter() {
         if let Some(on_click) = m.get_on_click_map(&name, &instance) {
             if let Some(cmd) = on_click.get(&button_str) {
-                execute_command(cmd);
+                match m.subst_args(cmd) {
+                    Some(cmd) => execute_command(&cmd),
+                    None => execute_command(cmd),
+                }
                 return Some(());
             }
         }
@@ -111,6 +114,7 @@ fn handle_click(
 }
 
 fn execute_command(cmd: &[String]) {
+    log::debug!("Executing cmd: {:?}", cmd);
     match p::Command::new(&cmd[0]).args(&cmd[1..]).spawn() {
         Ok(_child) => (),
         Err(err) => {
diff --git a/swayrbar/src/module.rs b/swayrbar/src/module.rs
index 0324ea4..7fba67b 100644
--- a/swayrbar/src/module.rs
+++ b/swayrbar/src/module.rs
@@ -44,4 +44,8 @@ pub trait BarModuleFn: Sync + Send {
         }
     }
     fn build(&self) -> s::Block;
+    fn subst_args<'a>(&'a self, _cmd: &'a [String]) -> Option<Vec<String>> {
+        // None means, no substitution are to be made.
+        None
+    }
 }
diff --git a/swayrbar/src/module/window.rs b/swayrbar/src/module/window.rs
index e2696a7..2da3c39 100644
--- a/swayrbar/src/module/window.rs
+++ b/swayrbar/src/module/window.rs
@@ -16,6 +16,7 @@
 //! The window `swayrbar` module.
 
 use std::collections::HashMap;
+use std::sync::Mutex;
 
 use crate::config;
 use crate::module::BarModuleFn;
@@ -28,11 +29,15 @@ const NAME: &str = "window";
 
 pub struct BarModuleWindow {
     config: config::ModuleConfig,
+    pid: Mutex<i32>,
 }
 
 impl BarModuleFn for BarModuleWindow {
     fn create(config: config::ModuleConfig) -> Box<dyn BarModuleFn> {
-        Box::new(BarModuleWindow { config })
+        Box::new(BarModuleWindow {
+            config,
+            pid: Mutex::new(0),
+        })
     }
 
     fn default_config(instance: String) -> config::ModuleConfig {
@@ -41,13 +46,19 @@ impl BarModuleFn for BarModuleWindow {
             instance,
             format: "🪟 {title} — {app_name}".to_owned(),
             html_escape: Some(false),
-            on_click: Some(HashMap::from([(
-                "Left".to_owned(),
-                vec![
-                    "swayr".to_owned(),
-                    "switch-to-urgent-or-lru-window".to_owned(),
-                ],
-            )])),
+            on_click: Some(HashMap::from([
+                (
+                    "Left".to_owned(),
+                    vec![
+                        "swayr".to_owned(),
+                        "switch-to-urgent-or-lru-window".to_owned(),
+                    ],
+                ),
+                (
+                    "Right".to_owned(),
+                    vec!["kill".to_owned(), "{pid}".to_owned()],
+                ),
+            ])),
         }
     }
 
@@ -62,10 +73,14 @@ impl BarModuleFn for BarModuleWindow {
             .find(|n| n.focused && n.get_type() == ipc::Type::Window);
         let text = match focused_win {
             Some(win) => {
-                format_placeholders!(&self.config.format,
-                                     self.config.is_html_escape(), {
-                    "title" | "name"  =>  win.get_name(),
-                    "app_name" => win.get_app_name(),
+                let mut pid = self.pid.lock().expect("Couldn't lock pid!");
+                *pid = win.pid.unwrap_or(-1);
+                format_placeholders!(
+                    &self.config.format,
+                    self.config.is_html_escape(), {
+                        "title" | "name"  =>  win.get_name(),
+                        "app_name" => win.get_app_name(),
+                        "pid" => *pid,
                 })
             }
             None => String::new(),
@@ -90,4 +105,29 @@ impl BarModuleFn for BarModuleWindow {
             separator_block_width: None,
         }
     }
+
+    fn get_on_click_map(
+        &self,
+        name: &str,
+        instance: &str,
+    ) -> Option<&HashMap<String, Vec<String>>> {
+        let cfg = self.get_config();
+        if name == cfg.name && instance == cfg.instance {
+            cfg.on_click.as_ref()
+        } else {
+            None
+        }
+    }
+
+    fn subst_args<'a>(&'a self, cmd: &'a [String]) -> Option<Vec<String>> {
+        let cmd = cmd
+            .iter()
+            .map(|arg| {
+                format_placeholders!(arg, false, {
+                    "pid" => *self.pid.lock().expect("Could not lock pid."),
+                })
+            })
+            .collect();
+        Some(cmd)
+    }
 }