feat: saving image

dialog is missing!!

src/main.rs

@@ -1,11 +1,14 @@
-use std::env;
+use std::{env, ffi::OsStr, fs};
 
 use iced::{
     Color, Element, Renderer, Subscription, Task, Theme, color, event,
     keyboard::{self, Key, key},
     theme, widget, window,
 };
-use image::{EncodableLayout, ImageReader, Pixel, Rgba, RgbaImage, imageops};
+use image::{
+    EncodableLayout, ImageReader, Pixel, Rgba, RgbaImage, codecs::webp::WebPEncoder, imageops,
+};
+use rfd::FileDialog;
 
 #[derive(Clone, Debug)]
 enum Message {
@@ -85,6 +88,35 @@ impl State {
                     return self.allocate_image();
                 }
 
+                Key::Character("s") => {
+                    let Some(path) = FileDialog::new().save_file() else {
+                        eprintln!("no path to save provided");
+                        return Task::none();
+                    };
+
+                    let Ok(file) = fs::File::create(&path)
+                        .inspect_err(|e| eprintln!("failed to create file: {e}"))
+                    else {
+                        return Task::none();
+                    };
+
+                    let maybe_encoder =
+                        match path.extension().map(OsStr::to_string_lossy).as_deref() {
+                            Some("webp") => Some(WebPEncoder::new_lossless(file)),
+
+                            None | Some(_) => None,
+                        };
+
+                    let result = if let Some(encoder) = maybe_encoder {
+                        self.image.write_with_encoder(encoder)
+                    } else {
+                        self.image.save(path)
+                    };
+
+                    #[allow(unused_must_use)]
+                    result.inspect_err(|e| eprintln!("failed to save image: {e}"));
+                }
+
                 // ignore unused keys
                 _ => {}
             },