feat: implement selection-first multi-target editing

src/session.rs

@@ -155,6 +155,55 @@ Vamp.command("healthy") { |editor, args| editor.replace "healthy #{args}" }
         }
     }
 
+    #[test]
+    fn configured_selection_actions_edit_together_and_invoke_plugins_once() {
+        let fixture = Fixture::new();
+        fixture.file("buffer.txt", "  alpha\nb\n gamma");
+        fixture.file(
+            "once.rb",
+            r#"
+Vamp.plugin "once", requires: ["text"]
+Vamp.command("once") { |editor, _| editor.insert "!" }
+"#,
+        );
+        let mut session = fixture.open(
+            r#"
+Vamp.configure do |config|
+  config.plugin "once.rb"
+  config.bind "r", config.core.select_lines, mode: config.modes.visual
+  config.bind "z", config.core.clone_below
+  config.bind "f", "once"
+end
+"#,
+        );
+        session.handle(Input::Char('v'));
+        session.handle(Input::Char('j'));
+        session.handle(Input::Char('j'));
+        session.handle(Input::Char('r'));
+        assert_eq!(session.editor().selection_count(), 3);
+        session.handle(Input::Char('A'));
+        session.handle(Input::Char('?'));
+        session.handle(Input::Escape);
+        assert_eq!(session.editor().lines(), &["  alpha?", "b?", " gamma?"]);
+        session.handle(Input::Char('u'));
+        assert_eq!(session.editor().lines(), &["  alpha", "b", " gamma"]);
+        assert_eq!(session.editor().selection_count(), 3);
+        session.handle(Input::Char('f'));
+        assert_eq!(session.editor().selection_count(), 1);
+        assert_eq!(
+            session
+                .editor()
+                .lines()
+                .iter()
+                .map(|line| line.matches('!').count())
+                .sum::<usize>(),
+            1
+        );
+        session.handle(Input::Char('u'));
+        assert_eq!(session.editor().lines(), &["  alpha", "b", " gamma"]);
+        assert_eq!(session.editor().selection_count(), 3);
+    }
+
     #[test]
     fn startup_rejection_installs_no_commands_and_keeps_other_plugins_and_core() {
         let fixture = Fixture::new();
@@ -468,7 +517,7 @@ end
         session.handle(Input::Ctrl('v'));
         assert_eq!(session.editor().mode(), crate::editor::Mode::Visual);
         session.handle(Input::Ctrl('f'));
-        assert_eq!(session.editor().selection().unwrap().end.column, 3);
+        assert_eq!(session.editor().selections()[0].end.column, 3);
         session.handle(Input::Ctrl('c'));
         assert_eq!(session.editor().mode(), crate::editor::Mode::Normal);
         assert!(!session.editor().dirty());
@@ -491,7 +540,7 @@ end
         session.handle(Input::Ctrl('v'));
         session.handle(Input::Ctrl('g'));
         assert_eq!(session.editor().mode(), crate::editor::Mode::Normal);
-        assert_eq!(session.editor().selection(), None);
+        assert!(session.editor().selections().is_empty());
     }
 
     #[test]