Add syntaxes and themes method

src/assets.rs

@@ -164,8 +164,8 @@ impl HighlightingAssets {
         self.syntax_set.syntaxes()
     }
 
-    pub fn themes(&self) -> impl Iterator<Item = &String> {
-        self.theme_set.themes.keys()
+    pub fn themes(&self) -> impl Iterator<Item = &str> {
+        self.theme_set.themes.keys().map(|s| s.as_ref())
     }
 
     pub(crate) fn get_theme(&self, theme: &str) -> &Theme {

src/pretty_printer.rs

@@ -2,6 +2,7 @@ use std::ffi::OsStr;
 use std::io::Read;
 
 use console::Term;
+use syntect::parsing::SyntaxReference;
 
 use crate::{
     assets::HighlightingAssets,
@@ -201,6 +202,14 @@ impl<'a> PrettyPrinter<'a> {
         self
     }
 
+    pub fn themes(&self) -> impl Iterator<Item = &str> {
+        self.assets.themes()
+    }
+
+    pub fn syntaxes(&self) -> impl Iterator<Item = &SyntaxReference> {
+        self.assets.syntaxes().iter()
+    }
+
     /// Pretty-print all specified inputs. This method will "use" all stored inputs.
     /// If you want to call 'print' multiple times, you have to call the appropriate
     /// input_* methods again.