Added first version of monero qr code generator

qr_code_crypto/.gitignore

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+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb

qr_code_crypto/Cargo.toml

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+[package]
+name = "qr_code_crypto"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+qrcode = { version = "0.14.1" }
+rust_decimal = "1.39.0"

qr_code_crypto/src/lib.rs

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+pub trait CryptoInvoice {
+    fn new(address: &str) -> Self;
+    fn set_query_part(self, name: &str, value: &str) -> Self;
+    fn validate(self) -> bool;
+    fn address(self) -> String;
+    fn uri(self) -> String;
+}
+
+// See: https://github.com/monero-project/monero/wiki/URI-Formatting
+#[derive(Clone)]
+pub struct MoneroInvoice {
+    pub address: String,
+    pub query: String,
+}
+
+impl CryptoInvoice for MoneroInvoice {
+    fn new(address: &str) -> Self {
+        MoneroInvoice {
+            address: address.to_string(),
+            query: String::new(),
+        }
+    }
+
+    fn set_query_part(mut self, name: &str, value: &str) -> Self {
+        if self.query.is_empty() {
+            self.query.push('?');
+        }
+        if self.query.len() > 1 {
+            self.query.push('&');
+        }
+        self.query
+            .push_str(&format!("{}={}", name, value.replace(' ', "%20")));
+        self
+    }
+
+    fn validate(self) -> bool {
+        unimplemented!();
+    }
+    fn address(self) -> String {
+        self.address
+    }
+    fn uri(self) -> String {
+        format!("monero:{}{}", self.address, self.query)
+    }
+}

qr_code_crypto/src/main.rs

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+use qr_code_crypto::{CryptoInvoice, MoneroInvoice};
+use qrcode::QrCode;
+use qrcode::render::unicode;
+use rust_decimal::prelude::*;
+
+fn create_and_print_qr_invoice(invoice: impl CryptoInvoice) {
+    let code = QrCode::new(invoice.uri()).unwrap();
+    let image = code
+        .render::<unicode::Dense1x2>()
+        .dark_color(unicode::Dense1x2::Light)
+        .light_color(unicode::Dense1x2::Dark)
+        .build();
+    println!("{image}");
+    //println!("{}", invoice.uri());
+}
+
+fn main() {
+    let monero_donation_adress = "888tNkZrPN6JsEgekjMnABU4TBzc2Dt29EPAvkRxbANsAnjyPbb3iQ1YBRk1UXcdRsiKc9dhwMVgN5S9cQUiyoogDavup3H".to_string();
+    let monero_invoice = MoneroInvoice::new(&monero_donation_adress);
+    create_and_print_qr_invoice(monero_invoice);
+}