option to write to file [CI SKIP]

src/main.rs

@@ -50,6 +50,13 @@ fn main() -> Result<(), Box<Error>> {
         let mut handle = stdin.lock();
         read_html(&mut handle)?
     };
+    
+    let mut out: Box<Write> = if let Some(path) = opt.output {
+        let mut file = File::open(&path)?;
+        Box::new(file)
+    } else {
+        Box::new(stdout())
+    };
 
     let css_selector = opt.selector;
 
@@ -75,7 +82,7 @@ fn main() -> Result<(), Box<Error>> {
         // Let's get the actual text in this text node. A text node wraps around
         // a RefCell<String>, so we need to call borrow() to get a &str out.
         //let text = text_node.as_text().unwrap().borrow();
-        write!(stdout(), "{}", serialize_node(as_node)?);
+        write!(out, "{}", serialize_node(as_node)?);
         /*if let Some(child) = as_node.first_child() {
 
             //TODO: Convert Nodes to String, as this only works for Nodes containing plain text

src/opts.rs

@@ -9,4 +9,6 @@ pub struct Opts {
 
     #[structopt(parse(from_os_str))]
     pub input: Option<PathBuf>,
+    #[structopt(short = "o", long = "out", parse(from_os_str))]
+    pub output: Option<PathBuf>,    
 }