feat: add overwrite confirmation CLI flags

src/args.rs

@@ -46,6 +46,22 @@ pub struct Args {
     )]
     pub quiet: bool,
 
+    #[arg(
+        short = 'y',
+        long,
+        help = "Overwrite output files without asking.",
+        conflicts_with = "no"
+    )]
+    pub yes: bool,
+
+    #[arg(
+        short = 'n',
+        long,
+        help = "Do not overwrite output files, exit immediately if file exists.",
+        conflicts_with = "yes"
+    )]
+    pub no: bool,
+
     #[arg(
         short = 'c',
         long,

src/main.rs

@@ -28,6 +28,26 @@ use std::process;
 
 pub const VERSION: &str = include_str!(concat!(env!("OUT_DIR"), "/version.txt"));
 
+fn should_overwrite(args: &Args, out_path: &str) -> bool {
+    match (args.yes, args.no || args.quiet) {
+        (true, _) => true,
+        (_, true) => false,
+        (false, false) => {
+            print!("File '{}' already exists. Overwrite? [y/N]: ", out_path);
+            let _ = io::stdout().flush();
+
+            let mut input = String::new();
+            match io::stdin().read_line(&mut input) {
+                Ok(_) => {
+                    let input = input.trim().to_lowercase();
+                    input == "y" || input == "yes"
+                }
+                Err(_) => false,
+            }
+        }
+    }
+}
+
 #[tracing::instrument]
 fn main() {
     let mut command = Args::command();
@@ -164,6 +184,12 @@ fn main() {
     };
 
     if let Some(out_path) = &args.output_path {
+        let out_path_file = std::path::Path::new(out_path);
+        if out_path_file.exists() && !should_overwrite(&args, out_path) {
+            tracing::info!("Not overwriting '{}'. Exiting.", out_path);
+            process::exit(1);
+        }
+
         if let Err(e) = fs::write(out_path, &output_bytes) {
             tracing::error!("Error writing output file: {}", e);
             process::exit(1);