Make Commander::run{_with_args} exit on errors

Author: Trung Nguyen

examples/clap_nested/main.rs

@@ -28,6 +28,5 @@ fn main() {
             println!("No subcommand matched");
             Ok(())
         })
-        .run()
-        .unwrap();
+        .run();
 }

src/lib.rs

@@ -80,8 +80,7 @@
 //!             println!("No subcommand matched");
 //!             Ok(())
 //!         })
-//!         .run()
-//!         .unwrap();
+//!         .run();
 //! }
 //! ```
 //!
@@ -358,11 +357,19 @@ impl<'a, S: ?Sized, T: ?Sized> Commander<'a, S, T> {
 }
 
 impl<'a, T: ?Sized> Commander<'a, (), T> {
-    pub fn run(&self) -> Result {
-        self.run_with_args(std::env::args_os())
+    pub fn run(&self) {
+        self.run_result().unwrap_or_else(|error| error.exit())
     }
 
-    pub fn run_with_args(
+    pub fn run_with_args(&self, args: impl IntoIterator<Item = impl Into<OsString> + Clone>) {
+        self.run_with_args_result(args).unwrap_or_else(|error| error.exit())
+    }
+
+    pub fn run_result(&self) -> Result {
+        self.run_with_args_result(std::env::args_os())
+    }
+
+    pub fn run_with_args_result(
         &self,
         args: impl IntoIterator<Item = impl Into<OsString> + Clone>,
     ) -> Result {

tests/common/mod.rs

@@ -14,7 +14,7 @@ pub fn assert_output<T>(
     out: &str,
     use_stderr: bool,
 ) {
-    assert_result(commander.run_with_args(args), out, use_stderr);
+    assert_result(commander.run_with_args_result(args), out, use_stderr);
 }
 
 pub fn assert_result(res: Result<(), clap::Error>, out: &str, use_stderr: bool) {

tests/lib.rs

@@ -66,13 +66,13 @@ fn two_level_commander() {
         .add_cmd(show)
         .add_cmd(what);
 
-    assert!(commander.run_with_args(&["program", "show"]).is_ok());
-    assert!(commander.run_with_args(&["program", "show", "foo"]).is_ok());
-    assert!(commander.run_with_args(&["program", "show", "bar"]).is_ok());
-    assert!(commander.run_with_args(&["program", "what"]).is_ok());
+    assert!(commander.run_with_args_result(&["program", "show"]).is_ok());
+    assert!(commander.run_with_args_result(&["program", "show", "foo"]).is_ok());
+    assert!(commander.run_with_args_result(&["program", "show", "bar"]).is_ok());
+    assert!(commander.run_with_args_result(&["program", "what"]).is_ok());
 
     assert_result(
-        commander.run(),
+        commander.run_result(),
         "error: program __VERSION__
 __AUTHOR__
 __DESC__