vim: Add 'gf' command, make files cmd-clickable (#16534)

Release Notes:

- vim: Added `gf` command to open files under the cursor.
- Filenames can now be `cmd`/`ctrl`-clicked, which opens them.

TODOs:

- [x] `main_test.go` <-- works
- [x] `./my-pkg/my_pkg.go` <-- works
- [x] `../go.mod` <-- works
- [x] `my-pkg/my_pkg.go` <-- works
- [x] `my-pkg/subpkg/subpkg_test.go` <-- works
- [x] `file\ with\ space\ in\ it.txt` <-- works
- [x] `"file\ with\ space\ in\ it.txt"` <-- works
- [x] `"main_test.go"` <-- works
- [x] `/Users/thorstenball/.vimrc` <-- works, but only locally
- [x] `~/.vimrc` <--works, but only locally
- [x] Get it working over collab
- [x] Get hover links working

Demo:



https://github.com/user-attachments/assets/26af7f3b-c392-4aaf-849a-95d6c3b00067

Collab demo:




https://github.com/user-attachments/assets/272598bd-0e82-4556-8f9c-ba53d3a95682

crates/vim/src/command.rs

@@ -742,9 +742,15 @@ fn generate_positions(string: &str, query: &str) -> Vec<usize> {
 mod test {
     use std::path::Path;
 
-    use crate::test::{NeovimBackedTestContext, VimTestContext};
+    use crate::{
+        state::Mode,
+        test::{NeovimBackedTestContext, VimTestContext},
+    };
+    use editor::Editor;
     use gpui::TestAppContext;
     use indoc::indoc;
+    use ui::ViewContext;
+    use workspace::Workspace;
 
     #[gpui::test]
     async fn test_command_basics(cx: &mut TestAppContext) {
@@ -923,4 +929,55 @@ mod test {
             .await;
         cx.shared_state().await.assert_eq("k\nk\nˇk\n4\n4\n3\n2\n1");
     }
+
+    fn assert_active_item(
+        workspace: &mut Workspace,
+        expected_path: &str,
+        expected_text: &str,
+        cx: &mut ViewContext<Workspace>,
+    ) {
+        let active_editor = workspace.active_item_as::<Editor>(cx).unwrap();
+
+        let buffer = active_editor
+            .read(cx)
+            .buffer()
+            .read(cx)
+            .as_singleton()
+            .unwrap();
+
+        let text = buffer.read(cx).text();
+        let file = buffer.read(cx).file().unwrap();
+        let file_path = file.as_local().unwrap().abs_path(cx);
+
+        assert_eq!(text, expected_text);
+        assert_eq!(file_path.to_str().unwrap(), expected_path);
+    }
+
+    #[gpui::test]
+    async fn test_command_gf(cx: &mut TestAppContext) {
+        let mut cx = VimTestContext::new(cx, true).await;
+
+        // Assert base state, that we're in /root/dir/file.rs
+        cx.workspace(|workspace, cx| {
+            assert_active_item(workspace, "/root/dir/file.rs", "", cx);
+        });
+
+        // Insert a new file
+        let fs = cx.workspace(|workspace, cx| workspace.project().read(cx).fs().clone());
+        fs.as_fake()
+            .insert_file("/root/dir/file2.rs", "This is file2.rs".as_bytes().to_vec())
+            .await;
+
+        // Put the path to the second file into the currently open buffer
+        cx.set_state(indoc! {"go to fiˇle2.rs"}, Mode::Normal);
+
+        // Go to file2.rs
+        cx.simulate_keystrokes("g f");
+
+        // We now have two items
+        cx.workspace(|workspace, cx| assert_eq!(workspace.items(cx).count(), 2));
+        cx.workspace(|workspace, cx| {
+            assert_active_item(workspace, "/root/dir/file2.rs", "This is file2.rs", cx);
+        });
+    }
 }