Add basic platform independent print function

.gitignore

@@ -7,3 +7,5 @@
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+
+*.swp

Cargo.lock

@@ -92,6 +92,13 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "basic_print"
+version = "0.1.0"
+dependencies = [
+ "wasm-bindgen",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -251,6 +258,7 @@ dependencies = [
 name = "control_web_apps"
 version = "0.1.0"
 dependencies = [
+ "basic_print",
  "console_error_panic_hook",
  "eframe",
  "egui",

Cargo.toml

@@ -11,6 +11,7 @@ rust-version = "1.63"
 [dependencies]
 egui = "0.19.0"
 eframe = "0.19.0"
+basic_print = {path = "basic_print"}
 
 # native:
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]

basic_print/Cargo.toml

+[package]
+name = "basic_print"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+wasm-bindgen = "0.2"

basic_print/src/lib.rs

+// Setup some basic print functions
+#[cfg(target_arch = "wasm32")]
+pub mod wasm_print {
+    use wasm_bindgen::prelude::*;
+
+    #[wasm_bindgen]
+    extern "C" {
+        #[wasm_bindgen(js_namespace = console)]
+        fn log(s: &str);
+    }
+
+    pub fn basic_print(s: &str) {
+        log(s);
+    }
+}
+
+#[cfg(target_arch = "wasm32")]
+pub use wasm_print::basic_print;
+
+#[cfg(not(target_arch = "wasm32"))]
+pub mod stdio_print {
+    pub fn basic_print(s: &str) {
+        println!("{}", s);
+        // should probably find a way to directly write a string slice to stdout...
+    }
+}
+
+#[cfg(not(target_arch = "wasm32"))]
+pub use stdio_print::basic_print;

src/app.rs

-pub struct TemplateApp {
-    // Example stuff:
-    label: String,
-
-    // this how you opt-out of serialization of a member
-    value: f32,
-}
-
-impl Default for TemplateApp {
-    fn default() -> Self {
-        Self {
-            // Example stuff:
-            label: "Hello World!".to_owned(),
-            value: 2.7,
-        }
-    }
-}
-
-impl TemplateApp {
-    /// Called once before the first frame.
-    pub fn new(_cc: &eframe::CreationContext<'_>) -> Self {
-        // This is also where you can customized the look at feel of egui using
-        // `cc.egui_ctx.set_visuals` and `cc.egui_ctx.set_fonts`.
-
-        Default::default()
-    }
-}
-
-impl eframe::App for TemplateApp {
-    /// Called each time the UI needs repainting, which may be many times per second.
-    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
-    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
-        let Self { label, value } = self;
-
-        // Examples of how to create different panels and windows.
-        // Pick whichever suits you.
-        // Tip: a good default choice is to just keep the `CentralPanel`.
-        // For inspiration and more examples, go to https://emilk.github.io/egui
-
-        #[cfg(not(target_arch = "wasm32"))] // no File->Quit on web pages!
-        egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
-            // The top panel is often a good place for a menu bar:
-            egui::menu::bar(ui, |ui| {
-                ui.menu_button("File", |ui| {
-                    if ui.button("Quit").clicked() {
-                        _frame.close();
-                    }
-                });
-            });
-        });
-
-        egui::SidePanel::left("side_panel").show(ctx, |ui| {
-            ui.heading("Side Panel");
-
-            ui.horizontal(|ui| {
-                ui.label("Write something: ");
-                ui.text_edit_singleline(label);
-            });
-
-            ui.add(egui::Slider::new(value, 0.0..=10.0).text("value"));
-            if ui.button("Increment").clicked() {
-                *value += 1.0;
-            }
-
-            ui.with_layout(egui::Layout::bottom_up(egui::Align::LEFT), |ui| {
-                ui.horizontal(|ui| {
-                    ui.spacing_mut().item_spacing.x = 0.0;
-                    ui.label("powered by ");
-                    ui.hyperlink_to("egui", "https://github.com/emilk/egui");
-                    ui.label(" and ");
-                    ui.hyperlink_to(
-                        "eframe",
-                        "https://github.com/emilk/egui/tree/master/crates/eframe",
-                    );
-                    ui.label(".");
-                });
-            });
-        });
-
-        egui::CentralPanel::default().show(ctx, |ui| {
-            // The central panel the region left after adding TopPanel's and SidePanel's
-
-            ui.heading("eframe template");
-            ui.hyperlink("https://github.com/emilk/eframe_template");
-            ui.add(egui::github_link_file!(
-                "https://github.com/emilk/eframe_template/blob/master/",
-                "Source code."
-            ));
-            egui::warn_if_debug_build(ui);
-        });
-
-        if false {
-            egui::Window::new("Window").show(ctx, |ui| {
-                ui.label("Windows can be moved by dragging them.");
-                ui.label("They are automatically sized based on contents.");
-                ui.label("You can turn on resizing and scrolling if you like.");
-                ui.label("You would normally chose either panels OR windows.");
-            });
-        }
-    }
-}

src/lib.rs

 #![warn(clippy::all, rust_2018_idioms)]
 
-mod app;
-pub use app::TemplateApp;
+#[allow(unused_imports)]
+use basic_print::basic_print;
+
+pub struct TemplateApp {
+    label: String,
+    value: f32,
+}
+
+impl Default for TemplateApp {
+    fn default() -> Self {
+        Self {
+            // Example stuff:
+            label: "Hello World!".to_owned(),
+            value: 2.7,
+        }
+    }
+}
+
+impl TemplateApp {
+    /// Called once before the first frame.
+    pub fn new(_cc: &eframe::CreationContext<'_>) -> Self {
+        // This is also where you can customized the look at feel of egui using
+        // `cc.egui_ctx.set_visuals` and `cc.egui_ctx.set_fonts`.
+
+        Default::default()
+    }
+}
+
+impl eframe::App for TemplateApp {
+    /// Called each time the UI needs repainting, which may be many times per second.
+    /// Put your widgets into a `SidePanel`, `TopPanel`, `CentralPanel`, `Window` or `Area`.
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        let Self { label, value } = self;
+
+        // Examples of how to create different panels and windows.
+        // Pick whichever suits you.
+        // Tip: a good default choice is to just keep the `CentralPanel`.
+        // For inspiration and more examples, go to https://emilk.github.io/egui
+
+        #[cfg(not(target_arch = "wasm32"))] // no File->Quit on web pages!
+        egui::TopBottomPanel::top("top_panel").show(ctx, |ui| {
+            // The top panel is often a good place for a menu bar:
+            egui::menu::bar(ui, |ui| {
+                ui.menu_button("File", |ui| {
+                    if ui.button("Quit").clicked() {
+                        _frame.close();
+                    }
+                });
+            });
+        });
+
+        egui::SidePanel::left("side_panel").show(ctx, |ui| {
+            ui.heading("Side Panel");
+
+            ui.horizontal(|ui| {
+                ui.label("Write something: ");
+                ui.text_edit_singleline(label);
+            });
+
+            ui.add(egui::Slider::new(value, 0.0..=10.0).text("value"));
+            if ui.button("Increment:").clicked() {
+                *value += 1.0;
+            }
+
+            ui.with_layout(egui::Layout::bottom_up(egui::Align::LEFT), |ui| {
+                ui.horizontal(|ui| {
+                    ui.spacing_mut().item_spacing.x = 0.0;
+                    ui.label("powered by ");
+                    ui.hyperlink_to("egui", "https://github.com/emilk/egui");
+                    ui.label(" and ");
+                    ui.hyperlink_to(
+                        "eframe",
+                        "https://github.com/emilk/egui/tree/master/crates/eframe",
+                        );
+                    ui.label(".");
+                });
+            });
+        });
+
+        egui::CentralPanel::default().show(ctx, |ui| {
+            // The central panel the region left after adding TopPanel's and SidePanel's
+
+            ui.heading("eframe template");
+            ui.hyperlink("https://github.com/emilk/eframe_template");
+            ui.add(egui::github_link_file!(
+                    "https://github.com/emilk/eframe_template/blob/master/",
+                    "Source code."
+                    ));
+            egui::warn_if_debug_build(ui);
+        });
+
+        if true {
+            egui::Window::new("Window").show(ctx, |ui| {
+                ui.label("Windows can be moved by dragging them.");
+                ui.label("They are automatically sized based on contents.");
+                ui.label("You can turn on resizing and scrolling if you like.");
+                ui.label("You would normally chose either panels OR windows.");
+            });
+        }
+    }
+}

src/main.rs

 #![warn(clippy::all, rust_2018_idioms)]
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
 
-// When compiling natively:
+use basic_print::basic_print;
+
+// Application startin points for the two targets
 #[cfg(not(target_arch = "wasm32"))]
 fn main() {
+    basic_print("Starting up...");
+
     // Log to stdout (if you run with `RUST_LOG=debug`).
     tracing_subscriber::fmt::init();
 
@@ -15,9 +19,10 @@ fn main() {
     );
 }
 
-// when compiling to web using trunk.
 #[cfg(target_arch = "wasm32")]
 fn main() {
+    basic_print("Starting up...");
+
     // Make sure panics are logged using `console.error`.
     console_error_panic_hook::set_once();