Initial commit with code to run in a directory

src/main.rs

@@ -0,0 +1,37 @@
+use std::fs;
+use std::path::{Path, PathBuf};
+use std::process::Command;
+use structopt::StructOpt;
+
+#[derive(StructOpt)]
+struct Opts {
+    #[structopt(parse(from_os_str), required = true)]
+    directory: PathBuf,
+}
+fn convert_epub_to_mobi(directory: &Path) {
+    if let Err(e) = fs::read_dir(directory) {
+        eprintln!("Error reading directory: {}", e);
+        return;
+    }
+    for entry in fs::read_dir(directory).unwrap() {
+        let entry = entry.unwrap();
+        let path = entry.path();
+        if path.is_dir() {
+            convert_epub_to_mobi(&path);
+        } else if let Some(ext) = path.extension() {
+            if ext.to_str() == Some("epub") {
+                let input_path = path.to_str().unwrap();
+                let output_path = path.with_extension("mobi");
+                println!("Converting {} to {}", input_path, output_path.display());
+                Command::new("ebook-convert")
+                    .args(&[input_path, output_path.to_str().unwrap()])
+                    .status()
+                    .unwrap();
+            }
+        }
+    }
+}
+fn main() {
+    let opts = Opts::from_args();
+    convert_epub_to_mobi(&opts.directory);
+}