Set up the bare minimum of a GUI app, opening only a single window

Cargo.lock

@@ -976,8 +976,15 @@ name = "fitnesstrax"
 version = "0.1.0"
 dependencies = [
  "chrono",
+ "chrono-tz",
  "dimensioned 0.8.0",
  "emseries",
+ "gio",
+ "glib",
+ "glib-build-tools 0.18.0",
+ "gtk4",
+ "libadwaita",
+ "tokio",
 ]
 
 [[package]]

fitnesstrax/Cargo.toml

@@ -5,7 +5,26 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+name = "fitnesstrax"
+path = "src/lib.rs"
+
+[[bin]]
+name = "fitnesstrax"
+path = "src/main.rs"
+
 [dependencies]
+adw         = { version = "0.5", package = "libadwaita", features = [ "v1_2" ] }
 chrono      = { version = "0.4" }
+chrono-tz   = { version = "0.8" }
 dimensioned = { version = "0.8" }
 emseries    = { path = "../emseries" }
+gio         = { version = "0.18" }
+glib        = { version = "0.18" }
+gtk         = { version = "0.7", package = "gtk4", features = [ "v4_8" ] }
+tokio       = { version = "1.34", features = [ "full" ] }
+
+[build-dependencies]
+glib-build-tools = "0.18"
+
+

fitnesstrax/src/main.rs

@@ -1,3 +1,38 @@
+use fitnesstrax;
+use gtk::prelude::*;
+use std::env;
+
+struct AppState {}
+
+struct AppWindow {
+    window: adw::ApplicationWindow,
+}
+
 fn main() {
     println!("Hello, world!");
+
+    let app = adw::Application::builder()
+        .application_id("com.luminescent-dreams.fitnesstrax")
+        .resource_base_path("/com/luminescent-dreams/fitnesstrax")
+        .build();
+
+    /*
+    let runtime = tokio::runtime::Builder::new_multi_thread()
+        .enable_all()
+        .build()
+        .unwrap();
+        */
+
+    let app = adw::Application::builder()
+        .application_id("com.luminescent-dreams.fitnesstrax")
+        .resource_base_path("/com/luminescent-dreams/fitnesstrax")
+        .build();
+
+    app.connect_activate(move |app| {
+        let window = adw::ApplicationWindow::new(app);
+        window.present();
+    });
+
+    let args: Vec<String> = env::args().collect();
+    ApplicationExtManual::run_with_args(&app, &args);
 }

fitnesstrax/src/types.rs

@@ -1,3 +1,7 @@
+use chrono::NaiveDate;
+use dimensioned::si;
+use emseries::DateTimeTz;
+
 /// SetRep represents workouts like pushups or situps, which involve doing a "set" of a number of
 /// actions, resting, and then doing another set.
 pub struct SetRep {