Ali
ac9a03c4b9
# Objective Opening a file laods it twice. `decode_file_text` builds the whole file as a `String`, and that `String` stays alive alongside the finished rope while `text::Buffer::new` copies it in. The `Vec` behind it grows by doubling, so it also commits up to nearly the file's size again in capacity it never uses. Partially addresses #27283. ## Solution Add `decode_file_text_to_rope`, which streams the file in 1 MB blocks straight into a `Rope`, validating UTF-8 and normalizing line endings as it goes. The file is never fully held as a `String`. `LoadedFile::text` becomes a `Rope` carrying the `LineEnding` detected before normalizing, so `buffer_store` calls `Buffer::new_normalized`. ## Testing On a 729 MB SQL dump, peak memory fell 25% and CPU fell around 28%. tested on 5950x, win11. Release Notes: - Improved memory use when opening large files, reducing peak memory during load by roughly the size of the file itself.
This contains the code for Zed's Vim emulation mode.
Vim mode in Zed is supposed to primarily "do what you expect": it mostly tries to copy vim exactly, but will use Zed-specific functionality when available to make things smoother. This means Zed will never be 100% vim compatible, but should be 100% vim familiar!
The backlog is maintained in the #vim channel notes.
Testing against Neovim
If you are making a change to make Zed's behavior more closely match vim/nvim, you can create a test using the NeovimBackedTestContext.
For example, the following test checks that Zed and Neovim have the same behavior when running * in visual mode:
#[gpui::test]
async fn test_visual_star_hash(cx: &mut gpui::TestAppContext) {
let mut cx = NeovimBackedTestContext::new(cx).await;
cx.set_shared_state("ˇa.c. abcd a.c. abcd").await;
cx.simulate_shared_keystrokes(["v", "3", "l", "*"]).await;
cx.assert_shared_state("a.c. abcd ˇa.c. abcd").await;
}
To keep CI runs fast, by default the neovim tests use a cached JSON file that records what neovim did (see crates/vim/test_data), but while developing this test you'll need to run it with the neovim flag enabled:
cargo test -p vim --features neovim test_visual_star_hash
This will run your keystrokes against a headless neovim and cache the results in the test_data directory. Note that neovim must be installed and reachable on your $PATH in order to run the feature.
Testing zed-only behavior
Zed does more than vim/neovim in their default modes. The VimTestContext can be used instead. This lets you test integration with the language server and other parts of zed's UI that don't have a NeoVim equivalent.