added config speicifc printing macros

src/config.rs

@@ -54,6 +54,8 @@ pub struct Config
     pub recursive: Recursion,
     pub max_tasks: Option<NonZeroUsize>,
 
+    pub silent: bool,
+    
     #[cfg(feature="inspect")]
     pub serialise_output: Option<Option<PathBuf>>, // Some(None) means dump to `stdout`
 }
@@ -94,6 +96,7 @@ impl Default for Config
 	    paths: Vec::new(),
 	    recursive: Default::default(),
 	    max_tasks: None, //max_tasks_cpus(),
+	    silent: false,
 	    #[cfg(feature="inspect")]
 	    serialise_output: None,
 	}
@@ -145,3 +148,30 @@ impl fmt::Display for InvalidConfigError
 	}
     }
 }
+
+/// Print an error line in accordance with `Config`'s output directives.
+#[macro_export] macro_rules! cfg_eprintln {
+    ($cfg:expr, $fmt:literal $($tt:tt)*) => {
+	{
+	    if !$cfg.silent {
+		eprintln!($fmt $($tt)*);
+	    }
+	}
+    }
+}
+
+/// Print a line in accordance with `Config`'s output directives.
+#[macro_export] macro_rules! cfg_println {
+    ($cfg:expr, $fmt:literal $($tt:tt)*) => {
+	{
+	    let cfg = &$cfg;
+	    if !cfg.silent {
+		if cfg.is_using_stdout() {
+		    eprintln!($fmt $($tt)*);
+		} else {
+		    println!($fmt $($tt)*);
+		}
+	    }
+	}
+    }
+}

src/work.rs

@@ -88,11 +88,7 @@ fn walk(state: State, root: PathBuf, root_ino: INode) -> BoxFuture<'static, Hash
     async move {
 	{
 	    let _guard = state.lock().enter().await;
-	    if state.config().is_using_stdout() {
-		eprintln!(" -> {:?}", root);
-	    } else {
-		println!(" -> {:?}", root);
-	    }
+	    cfg_println!(state.config(), " -> {:?}", root);
 	    match fs::read_dir(&root).await
 	    {
 		Ok(mut dir) => {