Move error handling to a callback

src/bin/bat/main.rs

@@ -211,7 +211,7 @@ fn main() {
 
     match result {
         Err(error) => {
-            handle_error(&error);
+            default_error_handler(&error);
             process::exit(1);
         }
         Ok(false) => {

src/controller.rs

@@ -20,6 +20,10 @@ impl<'b> Controller<'b> {
     }
 
     pub fn run(&self) -> Result<bool> {
+        self.run_with_error_handler(default_error_handler)
+    }
+
+    pub fn run_with_error_handler(&self, handle_error: impl Fn(&Error)) -> Result<bool> {
         // Do not launch the pager if NONE of the input files exist
         let mut paging_mode = self.config.paging_mode;
         if self.config.paging_mode != PagingMode::Never {

src/errors.rs

@@ -9,7 +9,7 @@ error_chain! {
     }
 }
 
-pub fn handle_error(error: &Error) {
+pub fn default_error_handler(error: &Error) {
     match error {
         Error(ErrorKind::Io(ref io_error), _)
             if io_error.kind() == ::std::io::ErrorKind::BrokenPipe =>