feat: add multiple buffers and file switching

src/session.rs

@@ -155,6 +155,67 @@ Vamp.command("healthy") { |editor, args| editor.replace "healthy #{args}" }
         }
     }
 
+    #[test]
+    fn buffers_share_config_and_plugin_host_but_keep_history_and_protect_hidden_edits() {
+        let fixture = Fixture::new();
+        let first = fixture.file("buffer.txt", "alpha");
+        let second = fixture.file("second.txt", "beta");
+        fixture.file(
+            "shared.rb",
+            r##"
+Vamp.plugin "shared", requires: ["text"]
+calls = 0
+Vamp.command("stamp") do |editor, _|
+  calls += 1
+  editor.insert "#{calls}:#{File.basename(editor.path)}:"
+end
+Vamp.command("fail") { |_, _| raise "shared host failure" }
+"##,
+        );
+        let mut session = fixture.open(
+            r#"
+Vamp.configure do |config|
+  config.plugin "shared.rb"
+  config.bind "g", "stamp"
+end
+"#,
+        );
+        session.handle(Input::Char('g'));
+        assert_eq!(session.editor().lines(), &["1:buffer.txt:alpha"]);
+        session.execute(&format!("edit {}", second.display()));
+        assert_eq!(session.editor().buffer_id(), 2);
+        session.handle(Input::Char('g'));
+        assert_eq!(session.editor().lines(), &["2:second.txt:beta"]);
+        session.execute("bdelete");
+        assert_eq!(session.editor().buffer_id(), 2);
+        assert_eq!(session.editor().buffer_count(), 2);
+        session.handle(Input::Char('u'));
+        assert_eq!(session.editor().lines(), &["beta"]);
+        session.execute("q");
+        assert!(!session.editor().should_quit());
+        session.execute("wq");
+        assert!(!session.editor().should_quit());
+        assert_eq!(fs::read_to_string(&first).unwrap(), "alpha");
+        assert_eq!(fs::read_to_string(&second).unwrap(), "beta");
+        session.execute("buffer 1");
+        assert_eq!(session.editor().lines(), &["1:buffer.txt:alpha"]);
+        session.handle(Input::Char('u'));
+        assert_eq!(session.editor().lines(), &["alpha"]);
+        session.handle(Input::Char('g'));
+        assert_eq!(session.editor().lines(), &["3:buffer.txt:alpha"]);
+        session.execute("w");
+        assert_eq!(fs::read_to_string(&first).unwrap(), "3:buffer.txt:alpha");
+        session.execute("bnext");
+        assert_eq!(session.editor().lines(), &["beta"]);
+        session.execute("fail");
+        assert!(session.editor().message().contains("disabled"));
+        session.execute("buffer 1");
+        session.handle(Input::Char('g'));
+        assert_eq!(session.editor().lines(), &["3:buffer.txt:alpha"]);
+        session.execute("q");
+        assert!(session.editor().should_quit());
+    }
+
     #[test]
     fn typed_palette_binding_prepares_arguments_and_retires_failed_plugin_commands() {
         let fixture = Fixture::new();