Initial commit: Mostly working

src/main.rs

@@ -0,0 +1,46 @@
+use std::env;
+use std::process;
+
+fn main() {
+    let args: Vec<_> = env::args().collect();
+
+    if args.len() < 3 {
+        eprintln!("USAGE: id3-image <mp3-file> <image-file>");
+        process::exit(1);
+    }
+
+    let music_filename = args[1].clone();
+    let image_filename = args[2].clone();
+
+    let mut tag = match id3::Tag::read_from_path(&music_filename) {
+        Ok(t) => t,
+        Err(e) => {
+            eprintln!("Error reading music file {}: {}", music_filename, e);
+            process::exit(1);
+        },
+    };
+
+    let image = match image::open(&image_filename) {
+        Ok(i) => i,
+        Err(e) => {
+            eprintln!("Error reading image {}: {}", image_filename, e);
+            process::exit(1);
+        },
+    };
+
+    let mut encoded_image_bytes = Vec::new();
+    // Unwrap: Writing to a Vec should always succeed;
+    image.write_to(&mut encoded_image_bytes, image::ImageOutputFormat::JPEG(90)).unwrap();
+
+    tag.add_picture(id3::frame::Picture {
+        mime_type: "image/jpeg".to_string(),
+        picture_type: id3::frame::PictureType::Other,
+        description: String::new(),
+        data: encoded_image_bytes,
+    });
+
+    if let Err(e) = tag.write_to_path(music_filename, id3::Version::Id3v23) {
+        eprintln!("Error writing image to file: {}", e);
+        process::exit(1);
+    }
+}