Initial messy version

Cargo.lock

@@ -2,12 +2,24 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "application-launcher"
 version = "0.1.0"
 dependencies = [
  "gtk4",
  "gtk4-layer-shell",
+ "nucleo-matcher",
+ "regex",
+ "shlex",
 ]
 
 [[package]]
@@ -486,6 +498,16 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "nucleo-matcher"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf33f538733d1a5a3494b836ba913207f14d9d4a1d3cd67030c5061bdd2cac85"
+dependencies = [
+ "memchr",
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "pango"
 version = "0.20.12"
@@ -555,6 +577,35 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "809e8dc61f6de73b46c85f4c96486310fe304c434cfa43669d7b40f711150908"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b15c43186be67a4fd63bee50d0303afffcef381492ebe2c5d87f324e1b8815c"
+
 [[package]]
 name = "rustc_version"
 version = "0.4.1"
@@ -599,6 +650,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "slab"
 version = "0.4.10"
@@ -681,6 +738,12 @@ version = "1.0.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
 
+[[package]]
+name = "unicode-segmentation"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6ccf251212114b54433ec949fd6a7841275f9ada20dddd2f29e9ceea4501493"
+
 [[package]]
 name = "version-compare"
 version = "0.2.0"

Cargo.toml

@@ -6,3 +6,6 @@ edition = "2024"
 [dependencies]
 gtk = { package = "gtk4", version = "0.9.6" }
 gtk4-layer-shell = "0.5.0"
+nucleo-matcher = "0.3.1"
+regex = "1.11.1"
+shlex = "1.3.0"

src/main.rs

@@ -1,3 +1,11 @@
+pub mod modules;
+pub mod widget;
+
+use std::sync::{
+    Arc, Mutex,
+    atomic::{AtomicU32, Ordering},
+};
+
 use gtk::{
     CssProvider, EventControllerKey, Orientation,
     gdk::{Display, Key},
@@ -5,8 +13,9 @@ use gtk::{
     prelude::*,
 };
 use gtk4_layer_shell::{Edge, Layer, LayerShell};
+use nucleo_matcher::{Config, Matcher};
 
-const ITEMS: [&'static str; 3] = ["Test", "Example", "Placeholder"];
+use crate::modules::{Module, SearchResult, desktop::DesktopModule};
 
 fn main() -> glib::ExitCode {
     let app = gtk::Application::builder()
@@ -31,57 +40,161 @@ fn build_ui(application: &gtk::Application) {
     window.set_anchor(Edge::Left, false);
 
     let container = gtk::Box::builder()
+        .css_classes(vec!["container"])
         .orientation(Orientation::Vertical)
-        .spacing(6)
+        .height_request(600)
         .build();
     window.set_child(Some(&container));
 
     let input = gtk::Entry::builder()
         .css_classes(vec!["main-input"])
         .placeholder_text("Start typing...")
-        .width_request(800)
         .build();
 
     container.append(&input);
 
+    let below_input_container = gtk::Box::builder()
+        .orientation(Orientation::Horizontal)
+        .spacing(0)
+        .hexpand(true)
+        .vexpand(true)
+        .build();
+    container.append(&below_input_container);
+
     let result_container = gtk::Box::builder()
+        .css_classes(vec!["result-container"])
+        .orientation(Orientation::Vertical)
+        .spacing(0)
+        .width_request(400)
+        .overflow(gtk::Overflow::Hidden)
+        .build();
+    below_input_container.append(&result_container);
+
+    let detail_container = gtk::Box::builder()
+        .css_classes(vec!["detail-container"])
         .orientation(Orientation::Vertical)
         .spacing(2)
-        .height_request(600)
+        .width_request(800)
         .build();
-    container.append(&result_container);
+    below_input_container.append(&detail_container);
+
+    let current_index = Arc::new(AtomicU32::new(0));
+    let modules: Arc<Vec<Box<dyn Module>>> = Arc::new(vec![Box::new(DesktopModule::new())]);
+    let matcher = Arc::new(Mutex::new(Matcher::new(Config::DEFAULT.match_paths())));
+    let last_results = Arc::new(Mutex::new({
+        let mut matcher = matcher.lock().unwrap();
+        update_results("", &modules, &mut *matcher)
+    }));
 
     input.connect_changed(glib::clone! {
         #[weak]
         result_container,
+        #[weak]
+        current_index,
+        #[weak]
+        last_results,
         move |input| {
-            remove_all_children(&result_container);
             let search: &str = &input.text().to_lowercase();
-            for item in ITEMS {
-                if item.to_lowercase().starts_with(&search) {
-                    let label = gtk::Label::new(Some(item));
-                    result_container.append(&label);
+            let mut matcher = matcher.lock().unwrap();
+            current_index.store(0, Ordering::Relaxed);
+            let mut last_results = last_results.lock().unwrap();
+            *last_results = update_results(search, &modules, &mut *matcher);
+            render_result_list(&result_container, last_results.iter().take(10), 0);
+    }});
+
+    input.connect_activate(glib::clone! {
+        #[weak]
+        current_index,
+        #[weak]
+        last_results,
+        move|_| {
+            let selected_index = current_index.load(Ordering::Relaxed);
+            let last_results = last_results.lock().unwrap();
+            match last_results.get(selected_index as usize) {
+                Some(res) => res.execute(),
+                None => {}
             }
-            }
-            println!("{}", input.text());
+            std::process::exit(0);
     }});
 
     let event_controller = EventControllerKey::new();
-    event_controller.connect_key_pressed(|_, key, _, _| {
+    {
+        let last_results = last_results.clone();
+        event_controller.connect_key_pressed(move |_, key, _, _| {
             match key {
                 Key::Escape => {
                     std::process::exit(0);
                 }
+                Key::Down | Key::Tab => {
+                    let last_results = last_results.lock().unwrap();
+                    let _ = current_index.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |i| {
+                        if last_results.len() == 0 {
+                            return Some(0);
+                        }
+                        if i as usize == (last_results.len() - 1).min(9) {
+                            Some(i)
+                        } else {
+                            Some(i + 1)
+                        }
+                    });
+                    let selected_index = current_index.load(Ordering::Relaxed);
+                    render_result_list(
+                        &result_container,
+                        last_results.iter().take(10),
+                        selected_index as usize,
+                    );
+                    return glib::Propagation::Stop;
+                }
+                Key::Up | Key::ISO_Left_Tab => {
+                    let _ = current_index.fetch_update(Ordering::SeqCst, Ordering::SeqCst, |i| {
+                        if i == 0 { Some(0) } else { Some(i - 1) }
+                    });
+                    let selected_index = current_index.load(Ordering::Relaxed);
+                    let last_results = last_results.lock().unwrap();
+                    render_result_list(
+                        &result_container,
+                        last_results.iter().take(10),
+                        selected_index as usize,
+                    );
+                    return glib::Propagation::Stop;
+                }
                 _ => (),
             }
             glib::Propagation::Proceed
         });
+    }
 
     window.add_controller(event_controller);
 
     window.show();
 }
 
+fn update_results(
+    search: &str,
+    modules: &[Box<dyn Module>],
+    matcher: &mut Matcher,
+) -> Vec<Box<dyn SearchResult>> {
+    let mut results = vec![];
+    {
+        for module in modules.iter() {
+            results.extend(module.results_for_search(search, matcher));
+        }
+    }
+    results.sort_by(|a, b| b.confidence().cmp(&a.confidence()));
+    results
+}
+
+fn render_result_list<'a>(
+    container: &gtk::Box,
+    results: impl Iterator<Item = &'a Box<dyn SearchResult>>,
+    current_index: usize,
+) {
+    remove_all_children(&container);
+    for (i, result) in results.enumerate() {
+        widget::search_result::create(container, result, i == current_index);
+    }
+}
+
 fn remove_all_children(b: &gtk::Box) {
     let mut child = b.first_child();
     while let Some(c) = child {
@@ -99,6 +212,9 @@ fn load_css() {
     gtk::style_context_add_provider_for_display(
         &Display::default().expect("Could not connect to a display."),
         &provider,
-        gtk::STYLE_PROVIDER_PRIORITY_APPLICATION,
+        // We use a really high priority to be able to overwrite user style sheets, as these are
+        // often used for custom themes. We use the theme colors where possible, but sometimes we
+        // need to color something in a way that the theme might not expect.
+        1000, // gtk::STYLE_PROVIDER_PRIORITY_APPLICATION
     );
 }

src/modules/desktop.rs

@@ -0,0 +1,178 @@
+use std::{
+    path::{Path, PathBuf},
+    str::FromStr,
+};
+
+use gtk::{
+    gio::{
+        AppInfo, DesktopAppInfo, Icon,
+        prelude::{AppInfoExt, DesktopAppInfoExtManual},
+    },
+    prelude::BoxExt,
+};
+use nucleo_matcher::{
+    Matcher, Utf32Str,
+    pattern::{AtomKind, CaseMatching, Normalization, Pattern},
+};
+use regex::Regex;
+
+use crate::modules::{Module, SearchResult};
+
+const SEARCH_THRESHOLD: u32 = 0;
+
+pub struct DesktopResult {
+    pub confidence: u32,
+    pub app_info: DesktopAppInfo,
+}
+
+pub struct DesktopModule {
+    pub desktop_entries: Vec<DesktopAppInfo>,
+}
+
+impl DesktopModule {
+    pub fn new() -> Self {
+        let desktop_entries = AppInfo::all()
+            .into_iter()
+            .filter_map(|entry| entry.id())
+            .filter_map(|id| DesktopAppInfo::new(&id))
+            .filter(|entry| {
+                !entry.executable().as_os_str().is_empty()
+                    && !entry.display_name().is_empty()
+                    && entry.should_show()
+            })
+            .collect();
+
+        Self { desktop_entries }
+    }
+}
+
+impl Module for DesktopModule {
+    fn results_for_search(
+        &self,
+        search: &str,
+        matcher: &mut Matcher,
+    ) -> Vec<Box<dyn SearchResult>> {
+        let mut results: Vec<Box<dyn SearchResult>> = vec![];
+        let pattern = Pattern::new(
+            search,
+            CaseMatching::Smart,
+            Normalization::Smart,
+            AtomKind::Fuzzy,
+        );
+        for app in self.desktop_entries.iter() {
+            let name: String = app.name().into();
+            let mut name_buf = Vec::new();
+            let name = Utf32Str::new(&name, &mut name_buf);
+            let score = pattern.score(name, matcher).unwrap_or(0);
+            if score > SEARCH_THRESHOLD {
+                results.push(Box::new(DesktopResult {
+                    confidence: score,
+                    app_info: app.clone(),
+                }));
+            }
+        }
+
+        results
+    }
+}
+
+impl SearchResult for DesktopResult {
+    fn confidence(&self) -> u32 {
+        self.confidence
+    }
+    fn label(&self) -> String {
+        self.app_info.name().into()
+    }
+    fn description(&self) -> Option<String> {
+        self.app_info.description().map(Into::into)
+    }
+
+    fn icon(&self) -> Option<Icon> {
+        self.app_info.icon()
+    }
+
+    fn render_detail(&self, container: &gtk::Box) {
+        let text = format!("[{}] {}", self.confidence, self.app_info.name(),);
+        let label = gtk::Label::builder()
+            .label(text)
+            .halign(gtk::Align::Start)
+            .build();
+        container.append(&label);
+    }
+
+    fn execute(&self) {
+        let app_id = self.app_info.id();
+        let mut app_exec = match self
+            .app_info
+            .commandline()
+            .map(|p| p.to_str().map(ToOwned::to_owned))
+            .flatten()
+        {
+            Some(app_exec) => app_exec,
+            None => return,
+        };
+
+        let mut app_dir = None;
+        if let Some(mut desktop_entry_path) = self.app_info.filename() {
+            if let Some(desktop_entry_path) = desktop_entry_path.to_str() {
+                app_exec = app_exec.replace("%k", desktop_entry_path);
+            }
+            desktop_entry_path.pop();
+            app_dir = Some(desktop_entry_path);
+        }
+
+        app_exec = Regex::new(r"\%[uUfFdDnNickvm]")
+            .unwrap()
+            .replace(&app_exec, "")
+            .to_string();
+
+        let working_dir = match self
+            .app_info
+            .string("Path")
+            .map(|path| PathBuf::from_str(&path).ok())
+            .flatten()
+        {
+            Some(path) => Some(path),
+            None => app_dir,
+        };
+
+        if self.app_info.boolean("DBusActivatable") {
+            if let Some(app_id) = app_id {
+                launch_cmd(vec!["gapplication", "launch", &app_id], working_dir);
+            } else {
+                return;
+            }
+        } else {
+            if self.app_info.boolean("Terminal") {
+                // TODO: Make terminal emulator configurable
+                launch_cmd(vec!["kitty", &app_exec], working_dir);
+            } else {
+                if let Some(cmd) = shlex::split(&app_exec) {
+                    launch_cmd(cmd, working_dir);
+                }
+            }
+        };
+    }
+}
+
+fn launch_cmd(cmd: Vec<impl AsRef<str>>, working_dir: Option<PathBuf>) {
+    let cmd_prefix = vec!["systemd-run", "--user", "--scope"];
+    let mut cmd_prefix = cmd_prefix.iter().map(|s| Path::new(s)).collect::<Vec<_>>();
+    let cmd_suffix = cmd
+        .iter()
+        .map(|s| Path::new(s.as_ref()))
+        .collect::<Vec<_>>();
+    cmd_prefix.extend(cmd_suffix);
+    let cmd = cmd_prefix;
+    let env = gtk::glib::environ();
+    let env = env.iter().map(|f| Path::new(f)).collect::<Vec<_>>();
+
+    gtk::glib::spawn_async(
+        working_dir,
+        &cmd,
+        &env,
+        gtk::glib::SpawnFlags::SEARCH_PATH_FROM_ENVP | gtk::glib::SpawnFlags::SEARCH_PATH,
+        None,
+    )
+    .unwrap();
+}

src/modules/mod.rs

@@ -0,0 +1,19 @@
+use gtk::gio::Icon;
+use nucleo_matcher::Matcher;
+
+pub mod desktop;
+
+pub trait Module {
+    fn results_for_search(&self, search: &str, matcher: &mut Matcher)
+    -> Vec<Box<dyn SearchResult>>;
+}
+
+pub trait SearchResult {
+    fn confidence(&self) -> u32;
+    fn label(&self) -> String;
+    fn description(&self) -> Option<String>;
+    fn icon(&self) -> Option<Icon>;
+
+    fn render_detail(&self, container: &gtk::Box);
+    fn execute(&self);
+}

src/style.css

@@ -1,7 +1,44 @@
 .main-input {
+    background: @theme_bg_color;
     font-size: 32px;
+    border-bottom-left-radius: 0;
+    border-bottom-right-radius: 0;
+    border: 2px solid @borders;
+    outline: none;
 }
 
 .main-input text {
     margin: 8px;
 }
+
+.result {
+    padding: 8px 16px;
+}
+
+.result.selected {
+    color: @theme_selected_fg_color;
+    background: @theme_selected_bg_color;
+}
+
+.result-container {
+    border: 2px solid @borders;
+    /* We already get a border from the search input, so we don't need to repeat
+     * it here. */
+    border-top: none;
+    background: @theme_bg_color;
+    border-bottom-left-radius: 6px;
+}
+
+.result-name {
+    font-size: 16px;
+}
+
+.detail-container {
+    background: gray;
+    border-bottom-right-radius: 6px;
+}
+
+window {
+    background-color: transparent;
+}
+

src/widget/mod.rs

@@ -0,0 +1 @@
+pub mod search_result;

src/widget/search_result.rs

@@ -0,0 +1,36 @@
+use gtk::{Orientation, pango::EllipsizeMode, prelude::BoxExt};
+
+use crate::modules::SearchResult;
+
+pub fn create(container: &gtk::Box, result: &Box<dyn SearchResult>, is_selected: bool) {
+    let res_box = gtk::Box::builder()
+        .orientation(Orientation::Horizontal)
+        .css_classes(if is_selected {
+            vec!["result", "selected"]
+        } else {
+            vec!["result"]
+        })
+        .spacing(8)
+        .build();
+
+    // If there is an icon display it, otherwise display an empty box.
+    match result.icon() {
+        Some(icon) => res_box.append(&gtk::Image::builder().gicon(&icon).pixel_size(16).build()),
+        None => res_box.append(&gtk::Box::new(Orientation::Horizontal, 0)),
+    }
+
+    let detail_box = gtk::Box::new(Orientation::Vertical, 2);
+    detail_box.append(
+        &gtk::Label::builder()
+            .label(result.label())
+            .css_classes(vec!["result-name"])
+            .halign(gtk::Align::Start)
+            .max_width_chars(40)
+            .ellipsize(EllipsizeMode::End)
+            .hexpand(true)
+            .build(),
+    );
+    res_box.append(&detail_box);
+
+    container.append(&res_box);
+}