feat(shortcuts): add helper written in egui

This commit adds a simple egui helper application which shows a list of
shortcuts defined in a user's whkdrc file. Parsing AHK files is not
supported.

In addition to listing out shortcuts defined in the whkdrc file, the top
line allows users to add filter a filter to narrow down the list of
commands and key bindings to the ones they are interested in.

A new komorebic command "toggle-shortcuts" has been introduced which
will first attempt to kill "komorebi-shortcuts.exe", and then exit if
the kill signal was successful (ie. a process was closed), or proceed to
open "komorebi-shortcuts.exe" if the kill signal was not successful (ie.
no process was closed, so we should open one).

"komorebi-shortcuts.exe" has been added as a floating application in
lib.rs to allow for users to use the "komorebic move" command to
manipulate its position via their existing keyboard bindings.

komorebi-shortcuts/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "komorebi-shortcuts"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+whkd-parser = { git = "https://github.com/LGUG2Z/whkd", rev = "29df24ff2dd715655b0366bd2a598837c699a8e9" }
+whkd-core = { git = "https://github.com/LGUG2Z/whkd", rev = "29df24ff2dd715655b0366bd2a598837c699a8e9" }
+
+eframe = { workspace = true }
+dirs = { workspace = true }

komorebi-shortcuts/src/main.rs

@@ -0,0 +1,106 @@
+use eframe::egui::ViewportBuilder;
+use std::path::PathBuf;
+use whkd_core::HotkeyBinding;
+use whkd_core::Whkdrc;
+
+#[derive(Default)]
+struct Quicklook {
+    whkdrc: Option<Whkdrc>,
+    filter: String,
+}
+
+impl Quicklook {
+    fn new(_cc: &eframe::CreationContext<'_>) -> Self {
+        // Customize egui here with cc.egui_ctx.set_fonts and cc.egui_ctx.set_visuals.
+        // Restore app state using cc.storage (requires the "persistence" feature).
+        // Use the cc.gl (a glow::Context) to create graphics shaders and buffers that you can use
+        // for e.g. egui::PaintCallback.
+        let mut home = std::env::var("WHKD_CONFIG_HOME").map_or_else(
+            |_| {
+                dirs::home_dir()
+                    .expect("no home directory found")
+                    .join(".config")
+            },
+            |home_path| {
+                let home = PathBuf::from(&home_path);
+
+                if home.as_path().is_dir() {
+                    home
+                } else {
+                    panic!(
+                        "$Env:WHKD_CONFIG_HOME is set to '{home_path}', which is not a valid directory",
+                    );
+                }
+            },
+        );
+        home.push("whkdrc");
+
+        Self {
+            whkdrc: whkd_parser::load(&home).ok(),
+            filter: String::new(),
+        }
+    }
+}
+
+impl eframe::App for Quicklook {
+    fn update(&mut self, ctx: &eframe::egui::Context, _frame: &mut eframe::Frame) {
+        eframe::egui::CentralPanel::default().show(ctx, |ui| {
+            ui.set_max_width(ui.available_width());
+            ui.set_max_height(ui.available_height());
+            eframe::egui::ScrollArea::vertical().show(ui, |ui| {
+                eframe::egui::Grid::new("grid")
+                    .num_columns(2)
+                    .striped(true)
+                    .spacing([40.0, 4.0])
+                    .min_col_width(ui.available_width() / 2.0 - 20.0)
+                    .show(ui, |ui| {
+                        if let Some(whkdrc) = &self.whkdrc {
+                            ui.label("Filter");
+                            ui.add(
+                                eframe::egui::text_edit::TextEdit::singleline(&mut self.filter)
+                                    .background_color(ctx.style().visuals.faint_bg_color),
+                            );
+                            ui.end_row();
+                            ui.end_row();
+
+                            for binding in &whkdrc.bindings {
+                                if is_komorebic_binding(binding) {
+                                    let keys = binding.keys.join(" + ");
+                                    if self.filter.is_empty()
+                                        || binding.command.contains(&self.filter)
+                                    {
+                                        ui.label(keys);
+                                        ui.label(&binding.command);
+                                        ui.end_row();
+                                    }
+                                }
+                            }
+                        }
+                    });
+            });
+        });
+    }
+}
+
+fn main() {
+    let viewport_builder = ViewportBuilder::default()
+        .with_resizable(true)
+        .with_decorations(false);
+
+    let native_options = eframe::NativeOptions {
+        viewport: viewport_builder,
+        centered: true,
+        ..Default::default()
+    };
+
+    eframe::run_native(
+        "komorebi-shortcuts",
+        native_options,
+        Box::new(|cc| Ok(Box::new(Quicklook::new(cc)))),
+    )
+    .unwrap();
+}
+
+fn is_komorebic_binding(binding: &HotkeyBinding) -> bool {
+    binding.command.starts_with("komorebic")
+}