feat: capture errors into the field

cranelib minimizes the dependancy-only build itself anyway

Cargo.lock

@@ -812,6 +812,8 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1e0e367e4e7da84520dedcac1901e4da967309406d1e51017ae1abfb97adbd38"
 dependencies = [
  "bitflags 2.13.0",
+ "block2 0.6.2",
+ "libc",
  "objc2 0.6.4",
 ]
 
@@ -1647,6 +1649,7 @@ dependencies = [
  "dirs",
  "iced",
  "image",
+ "rfd",
 ]
 
 [[package]]
@@ -2719,6 +2722,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "pollster"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f3a9f18d041e6d0e102a0a46750538147e5e8992d3b4873aaafee2520b00ce3"
+
 [[package]]
 name = "portable-atomic"
 version = "1.13.1"
@@ -3019,6 +3028,33 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "19b30a45b0cd0bcca8037f3d0dc3421eaf95327a17cad11964fb8179b4fc4832"
 
+[[package]]
+name = "rfd"
+version = "0.17.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20dafead71c16a34e1ff357ddefc8afc11e7d51d6d2b9fbd07eaa48e3e540220"
+dependencies = [
+ "block2 0.6.2",
+ "dispatch2",
+ "js-sys",
+ "libc",
+ "log",
+ "objc2 0.6.4",
+ "objc2-app-kit 0.3.2",
+ "objc2-core-foundation",
+ "objc2-foundation 0.3.2",
+ "percent-encoding",
+ "pollster",
+ "raw-window-handle",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "web-sys",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "rgb"
 version = "0.8.53"

Cargo.toml

@@ -7,3 +7,4 @@ edition = "2024"
 iced = { version = "0.14.0", features = [ "image" ] }
 dirs = "6.0.0"
 image = "0.25.10"
+rfd = "0.17.2"

flake.nix

@@ -40,7 +40,7 @@
           buildInputs = with pkgs; [
           ];
 
-          src = craneLib.cleanCargoSource ./.;
+          src = ./.;
         };
 
         LD_LIBRARY_PATH = lib.makeLibraryPath dlDeps;
@@ -58,6 +58,16 @@
               desktopName = name;
               icon = name;
               exec = name;
+              mimeTypes = [
+                "image/png"
+                "image/jpeg"
+                "image/gif"
+                "image/webp"
+                "image/avif"
+                "image/tiff"
+                "image/bmp"
+                "image/vnd.microsoft.icon" # .ico
+              ];
             };
           in
           craneLib.buildPackage (
@@ -65,12 +75,16 @@
             // {
               inherit cargoArtifacts;
 
-              nativeBuildInputs = commonArgs.nativeBuildInputs ++ [
+              nativeBuildInputs =
+                commonArgs.nativeBuildInputs
+                ++ [
                   pkgs.autoPatchelfHook
-              ];
+                ]
+                ++ lib.optional pkgs.stdenv.hostPlatform.isLinux pkgs.makeBinaryWrapper;
 
               buildInputs = commonArgs.buildInputs ++ [
                 pkgs.libgcc
+                pkgs.zenity
               ];
 
               runtimeDependencies = dlDeps;
@@ -80,6 +94,10 @@
               postFixup = ''
                 mkdir -p "$out/share/applications"
                 ln -s "${desktopItem}"/share/applications/* "$out/share/applications/"
+              ''
+              + lib.optionalString pkgs.stdenv.hostPlatform.isLinux /* sh */ ''
+                wrapProgram $out/bin/${name} --inherit-argv0 \
+                  --prefix PATH : ${lib.makeBinPath [ pkgs.zenity ]}
               '';
             }
           );

src/main.rs

@@ -1,11 +1,12 @@
-use std::env;
+use std::{env, ffi::OsStr, fs};
 
 use iced::{
-    Color, Element, Renderer, Subscription, Task, Theme, color, event,
+    Alignment, Color, Element, Length, 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, RgbaImage, codecs::webp::WebPEncoder, imageops};
+use rfd::FileDialog;
 
 #[derive(Clone, Debug)]
 enum Message {
@@ -16,43 +17,53 @@ enum Message {
 
 #[derive(Clone, Debug)]
 struct State {
-    image: RgbaImage,
+    image: Option<RgbaImage>,
     image_display: Option<widget::image::Allocation>,
+
+    error: Option<String>,
 }
 impl State {
     fn new() -> (Self, Task<Message>) {
-        let image = if let Some(path) = env::args().nth(1) {
+        let state = State {
+            image_display: None,
+            image: env::args().nth(1).and_then(|path| {
+                Some(
                     ImageReader::open(path)
                         .unwrap()
                         .decode()
                         .unwrap()
-                .into_rgba8()
+                        .into_rgba8(),
-        } else {
+                )
-            let mut image = RgbaImage::new(100, 100);
+            }),
 
-            imageops::horizontal_gradient(
+            error: None,
-                &mut image,
-                Rgba::from_slice(&[0, 0, 0, 0]),
-                Rgba::from_slice(&[255, 255, 255, 255]),
-            );
-
-            image
-        };
-
-        let state = State {
-            image_display: None,
-            image,
         };
         let allocate_image = state.allocate_image();
 
         (state, allocate_image)
     }
     fn view(&self) -> Element<'_, Message, Theme, Renderer> {
+        widget::column([
             if let Some(allocation) = self.image_display.as_ref() {
-            widget::image(allocation.handle()).expand(true).into()
+                widget::image::viewer(allocation.handle().clone())
+                    .width(Length::Fill)
+                    .height(Length::Fill)
+                    .into()
+            } else {
+                widget::container(widget::text(include_str!("usage.txt")))
+                    .height(Length::Fill)
+                    .width(Length::Fill)
+                    .align_x(Alignment::Center)
+                    .align_y(Alignment::Center)
+                    .into()
+            },
+            if let Some(error) = self.error.as_ref() {
+                widget::text(error).style(widget::text::danger).into()
             } else {
                 widget::space().into()
-        }
+            },
+        ])
+        .into()
     }
     fn update(&mut self, message: Message) -> Task<Message> {
         match message {
@@ -74,17 +85,34 @@ impl State {
                     }
                 }
 
-                Key::Character("q") => return window::latest().and_then(window::close),
+                Key::Character("o") => {
+                    self.error = self.open_image();
+                    return self.allocate_image();
+                }
 
                 Key::Character("r") => {
-                    self.image = imageops::rotate90(&self.image);
+                    let Some(image) = self.image.as_ref() else {
+                        eprintln!("no image to rotate");
+                        return Task::none();
+                    };
+                    self.image = Some(imageops::rotate90(image));
                     return self.allocate_image();
                 }
                 Key::Character("i") => {
-                    imageops::invert(&mut self.image);
+                    let Some(image) = self.image.as_mut() else {
+                        eprintln!("no image to invert");
+                        return Task::none();
+                    };
+                    imageops::invert(image);
                     return self.allocate_image();
                 }
 
+                Key::Character("s") => {
+                    self.error = self.save_image();
+                }
+
+                Key::Character("q") => return window::latest().and_then(window::close),
+
                 // ignore unused keys
                 _ => {}
             },
@@ -96,11 +124,78 @@ impl State {
         Task::none()
     }
 
+    fn open_image(&mut self) -> Option<String> {
+        let Some(path) = FileDialog::new()
+            .add_filter(
+                "image",
+                &[
+                    "png", "PNG", "jpg", "JPG", "jpeg", "JPEG", "avif", "bmp", "exr", "ff", "gif",
+                    "hdr", "ico", "pnm", "qoi", "tga", "tiff", "webp",
+                ],
+            )
+            .pick_file()
+        else {
+            return Some("no path to open provided".into());
+        };
+
+        let reader = match ImageReader::open(path) {
+            Ok(r) => r,
+            Err(e) => return Some(format!("failed to create reader: {e}")),
+        };
+
+        let decoded_image = match reader.decode() {
+            Ok(i) => i,
+            Err(e) => return Some(format!("failed to decode image: {e}")),
+        };
+
+        self.image = Some(decoded_image.into_rgba8());
+
+        None
+    }
+
+    fn save_image(&self) -> Option<String> {
+        let Some(image) = self.image.as_ref() else {
+            return Some("no image to save".into());
+        };
+
+        let Some(path) = FileDialog::new().save_file() else {
+            return Some("no path to save provided".into());
+        };
+
+        match fs::File::create(&path) {
+            Err(e) => return Some(format!("failed to create file: {e}")),
+            Ok(file) => {
+                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 {
+                    image.write_with_encoder(encoder)
+                } else {
+                    image.save(path)
+                };
+
+                if let Err(e) = result {
+                    return Some(format!("failed to save image: {e}"));
+                }
+            }
+        };
+
+        None
+    }
+
     fn allocate_image(&self) -> Task<Message> {
+        let Some(image) = self.image.as_ref() else {
+            eprintln!("no image to allocate");
+            return Task::none();
+        };
+
         widget::image::allocate(widget::image::Handle::from_rgba(
-            self.image.width(),
+            image.width(),
-            self.image.height(),
+            image.height(),
-            unsafe { std::mem::transmute::<_, &'static [u8]>(self.image.as_bytes()) },
+            unsafe { std::mem::transmute::<_, &'static [u8]>(image.as_bytes()) },
         ))
         .map(Message::ImageDisplayReady)
     }

src/usage.txt

@@ -0,0 +1,5 @@
+"o" to open a new image
+"r" to rotate
+"i" to invert colors
+"s" to save the image
+"q" to quit