feat(xatu): set CLI exit statuses

src/xatu/xatu_main.rs

@@ -1,7 +1,8 @@
 use clap::Parser;
 use status::ResultExt;
 use std::path::{Path, PathBuf};
-use xatu::SourceFile;
+use std::process::ExitCode;
+use xatu::{Report, SourceFile};
 
 fn is_nix_file(path: &Path) -> bool {
     path.extension().is_some_and(|extension| extension == "nix")
@@ -66,9 +67,7 @@ struct Args {
     paths: Vec<PathBuf>,
 }
 
-fn main() -> status::Result<()> {
-    let args = Args::parse();
-
+fn analyze(args: Args) -> status::Result<Report> {
     let paths: Vec<PathBuf> = args
         .paths
         .into_iter()
@@ -83,8 +82,22 @@ fn main() -> status::Result<()> {
         .flatten()
         .collect();
 
-    let report = xatu::future_sight(files)?;
-    print!("{report}");
-
-    Ok(())
+    xatu::future_sight(files)
+}
+
+fn main() -> ExitCode {
+    match analyze(Args::parse()) {
+        Ok(report) if report.is_clean() => {
+            println!("No findings.");
+            ExitCode::SUCCESS
+        }
+        Ok(report) => {
+            print!("{report}");
+            ExitCode::from(1)
+        }
+        Err(error) => {
+            eprintln!("{error}");
+            ExitCode::from(2)
+        }
+    }
 }