change how no-num /sentance works

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "markov"
-version = "0.6.3"
+version = "0.6.4"
 description = "Generate string of text from Markov chain fed by stdin"
 authors = ["Avril <flanchan@cumallover.me>"]
 edition = "2018"

src/sanitise/filter.rs

@@ -178,7 +178,7 @@ impl Filter
 	output
     }
 
-    pub fn filter_str<'a, T: AsRef<str>+'a>(&'a self, string: &'a T) -> FilterStr<'a>
+    pub fn filter_str<'a, T: AsRef<str>+'a +?Sized>(&'a self, string: &'a T) -> FilterStr<'a>
     {
 	FilterStr(string.as_ref(), self, OnceCell::new())
     }

src/sanitise/sentance.rs

@@ -68,7 +68,7 @@ impl Sentance
     }
 
     /// Create a new iterator over sentances from this string.
-    pub fn new_iter<'a>(from: &'a (impl AsRef<str> +'a + ?Sized)) -> impl Iterator<Item = &'a Self>
+    pub fn new_iter<'a>(from: &'a (impl AsRef<str> +'a + ?Sized)) -> impl Iterator<Item = &'a Self> + Clone
     {
 	let from = from.as_ref();
 	from.split_inclusive(is_sentance_boundary)

src/sentance.rs

@@ -17,9 +17,17 @@ pub async fn body(state: State, num: Option<usize>, mut output: mpsc::Sender<Str
 
     debug!("Taking {:?} from {:?}" ,num, string);
     let filter = state.outbound_filter();
-    for sen in sanitise::Sentance::new_iter(&string).take(num.unwrap_or(1))
-    {
-	output.send(filter.filter_owned(sen.to_owned())).await.map_err(|e| gen::GenBodyError(e.0))?;
+    if let Some(num) = num {
+	for sen in sanitise::Sentance::new_iter(&string).take(num)
+	{
+	    output.send(filter.filter_owned(sen.to_owned())).await.map_err(|e| gen::GenBodyError(e.0))?;
+	}
+    } else {
+	output.send(filter.filter_owned(match sanitise::Sentance::new_iter(&string) 
+				      .max_by_key(|x| x.len()) {
+					  Some(x) => x,
+					  #[cold] None => return Ok(()),  
+				      }.to_owned())).await.map_err(|e| gen::GenBodyError(e.0))?;
     }
     Ok(())
 }