Improvments to launcher.

Moved UI building to a function.
Found a way to clear GtkListBox without a loop.
Ran rustfmt.

.gitignore

@@ -1,2 +1,3 @@
 /target
 Cargo.lock
+.idea

examples/launcher/ipc.rs

@@ -1,6 +1,6 @@
 use pop_launcher::{Request, Response};
-use std::process;
 use std::io::{self, BufRead, Write};
+use std::process;
 
 pub struct LauncherIpc {
     child: process::Child,
@@ -16,13 +16,15 @@ impl LauncherIpc {
             .stdout(process::Stdio::piped())
             .spawn()?;
 
-        let stdin = child.stdin.take().ok_or(
-            io::Error::new(io::ErrorKind::Other, "failed to find child stdin")
-        )?;
+        let stdin = child.stdin.take().ok_or(io::Error::new(
+            io::ErrorKind::Other,
+            "failed to find child stdin",
+        ))?;
 
-        let stdout = io::BufReader::new(child.stdout.take().ok_or(
-                io::Error::new(io::ErrorKind::Other, "failed to find child stdout")
-        )?);
+        let stdout = io::BufReader::new(child.stdout.take().ok_or(io::Error::new(
+            io::ErrorKind::Other,
+            "failed to find child stdout",
+        ))?);
 
         Ok(Self {
             child,
@@ -33,9 +35,8 @@ impl LauncherIpc {
     }
 
     fn send_request(&mut self, request: Request) -> io::Result<()> {
-        let mut request_json = serde_json::to_string(&request).map_err(|err| {
-            io::Error::new(io::ErrorKind::InvalidInput, err)
-        })?;
+        let mut request_json = serde_json::to_string(&request)
+            .map_err(|err| io::Error::new(io::ErrorKind::InvalidInput, err))?;
         request_json.push('\n');
         self.stdin.write_all(request_json.as_bytes())
     }
@@ -43,9 +44,8 @@ impl LauncherIpc {
     fn recv_response(&mut self) -> io::Result<Response> {
         let mut response_json = String::new();
         self.stdout.read_line(&mut response_json)?;
-        serde_json::from_str(&response_json).map_err(|err| {
-            io::Error::new(io::ErrorKind::InvalidData, err)
-        })
+        serde_json::from_str(&response_json)
+            .map_err(|err| io::Error::new(io::ErrorKind::InvalidData, err))
     }
 
     pub fn request(&mut self, request: Request) -> io::Result<Response> {

examples/launcher/main.rs

@@ -1,11 +1,10 @@
 use gtk4 as gtk;
 
 use gtk::prelude::*;
+use gtk4::Application;
 use libcosmic::x;
-use std::{
-    cell::RefCell,
-    rc::Rc,
-};
+use std::{cell::RefCell, rc::Rc};
+use gtk4::glib::Type;
 
 use self::ipc::LauncherIpc;
 mod ipc;
@@ -14,12 +13,10 @@ fn icon_source(icon: &gtk::Image, source: &Option<pop_launcher::IconSource>) {
     match source {
         Some(pop_launcher::IconSource::Name(name)) => {
             icon.set_from_icon_name(Some(name));
-        },
+        }
         Some(pop_launcher::IconSource::Mime(content_type)) => {
-            icon.set_from_gicon(
-                &gio::content_type_get_icon(content_type)
-            );
-        },
+            icon.set_from_gicon(&gio::content_type_get_icon(content_type));
+        }
         _ => {
             icon.set_from_icon_name(None);
         }
@@ -27,20 +24,25 @@ fn icon_source(icon: &gtk::Image, source: &Option<pop_launcher::IconSource>) {
 }
 
 fn main() {
-    let launcher = Rc::new(RefCell::new(
-        LauncherIpc::new().expect("failed to connect to launcher service")
-    ));
-
     let app = gtk::Application::builder()
         .application_id("com.system76.Launcher")
         .build();
 
-    app.connect_activate(move |app| {
+    app.connect_activate(move |app| build_ui(app));
+
+    app.run();
+}
+
+fn build_ui(app: &Application) {
+    let launcher = Rc::new(RefCell::new(
+        LauncherIpc::new().expect("failed to connect to launcher service"),
+    ));
+
     let window = gtk::ApplicationWindow::builder()
         .application(app)
         .decorated(false)
-            .default_width(480)
-            .default_height(440)
+        .default_width(590)
+        .default_height(150)
         .title("Launcher")
         .build();
 
@@ -51,31 +53,32 @@ fn main() {
     vbox.set_margin_bottom(16);
     window.set_child(Some(&vbox));
 
-        let search = gtk::Entry::new();
+    let search = gtk::SearchEntry::new();
     search.set_placeholder_text(Some(" Type to search apps, or type '?' for more options."));
     vbox.append(&search);
-
+    {
+        let launcher = launcher.clone();
+        let search_changed = move |search: &gtk::SearchEntry| {
+            let listbox_widget = vbox.last_child().unwrap();
+            let gtk_list_box = Type::from_name("GtkListBox");
+            if gtk_list_box.is_some() && listbox_widget.type_() == gtk_list_box.unwrap() {
+                vbox.remove(&listbox_widget);
+            }
             let listbox = gtk::ListBox::new();
             vbox.append(&listbox);
 
-        {
-            let launcher = launcher.clone();
-            let search_changed = move |search: &gtk::Entry| {
-                //TODO: is this the best way to clear a listbox?
-                while let Some(child) = listbox.last_child() {
-                    listbox.remove(&child);
-                }
+            let response_res = launcher
+                .borrow_mut()
+                .request(pop_launcher::Request::Search(search.text().to_string()));
 
-                let response_res = launcher.borrow_mut().request(
-                    pop_launcher::Request::Search(search.text().to_string())
-                );
-
-                println!("{:#?}", response_res);
+            // println!("{:#?}", response_res);
 
             if let Ok(pop_launcher::Response::Update(results)) = response_res {
                 for (i, result) in results.iter().enumerate() {
                     // Limit to 9 results
-                        if i >= 9 { continue; }
+                    if i >= 9 {
+                        continue;
+                    }
 
                     let row = gtk::ListBoxRow::new();
                     listbox.append(&row);
@@ -140,7 +143,4 @@ fn main() {
     });
 
     window.show();
-    });
-
-    app.run();
 }