Initial implementation of breadpaper

CLI tool that sets a wallpaper with awww, generates a pywal colour
palette, and reloads bread-theme to recolour all running bread GTK apps.
Includes CI workflows, bakery metadata, and Arch PKGBUILD.

src/main.rs

@@ -0,0 +1,36 @@
+use std::path::PathBuf;
+use std::process;
+
+use clap::{Parser, Subcommand};
+
+#[derive(Parser)]
+#[command(name = "breadpaper", about = "Wallpaper manager for the bread desktop")]
+struct Cli {
+    #[command(subcommand)]
+    command: Command,
+}
+
+#[derive(Subcommand)]
+enum Command {
+    /// Set wallpaper, generate pywal palette, and reload bread themes
+    Set {
+        /// Path to the image file
+        path: PathBuf,
+    },
+    /// Print the current wallpaper path
+    Get,
+}
+
+fn main() {
+    let cli = Cli::parse();
+
+    let result = match cli.command {
+        Command::Set { path } => breadpaper::set(&path),
+        Command::Get => breadpaper::get().map(|p| println!("{}", p.display())),
+    };
+
+    if let Err(e) = result {
+        eprintln!("error: {e:#}");
+        process::exit(1);
+    }
+}