takes an input string and converts it to v40 qr code

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "godiva"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.3.19", features = ["derive", "env"] }
+eframe = { version = "0.22", default-features = false, features = ["default_fonts", "wgpu", "tts", "accesskit"] }
+egui_extras = { version = "0.22", default-features = false, features = ["chrono", "image"] }
+env_logger = "*"
+fast_qr = { version = "0.9", default-features = false, features = ["image"] }
+raptorq = "1.7"
+# pinning this to resolve conflict between eframe and fast_qr with the image crate
+png = "0.17.6"

src/main.rs

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+use std::ffi::OsString;
+
+use clap::Parser;
+use eframe::egui;
+use egui_extras::RetainedImage;
+use fast_qr::convert::image::ImageBuilder;
+
+#[derive(Parser, Debug)]
+#[clap(author, version, trailing_var_arg = true)]
+struct Cli {
+    #[clap(long, short, help = "File to expose")]
+    pub file: Option<OsString>,
+    text: Vec<String>,
+}
+
+impl Cli {
+    pub fn text(&self) -> &Vec<String> {
+        &self.text
+    }
+}
+
+fn main() -> Result<(), eframe::Error> {
+    env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).
+
+    let cli = Cli::parse();
+
+    let content = if let Some(file) = cli.file {
+        file.to_string_lossy().bytes().collect()
+    } else {
+        cli.text().join(" ").bytes().collect()
+    };
+
+    //println!("content: {content}");
+
+    let options = eframe::NativeOptions {
+        initial_window_size: Some(egui::vec2(1200.0, 1200.0)),
+        ..Default::default()
+    };
+
+    eframe::run_native(
+        "Show an image with eframe/egui",
+        options,
+        Box::new(|_cc| Box::new(Flasher { content })),
+    )
+}
+
+struct Flasher {
+    pub content: Vec<u8>,
+}
+
+impl eframe::App for Flasher {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        egui::CentralPanel::default().show(ctx, |ui| {
+            let heading_text = String::from_utf8(self.content.clone()).unwrap();
+            ui.heading(heading_text);
+            let qr = fast_qr::QRBuilder::new(self.content.clone())
+                .version(fast_qr::Version::V40)
+                .build()
+                .unwrap();
+            let bytes = ImageBuilder::default()
+                .fit_width(1200)
+                .to_pixmap(&qr)
+                .encode_png()
+                .unwrap();
+
+            let img = RetainedImage::from_image_bytes("generated qr code", &bytes).unwrap();
+            img.show(ui);
+        });
+    }
+}