Problem ------- In #19040, I reported two things that started happening somewhen in the last three months when using neovim in hterm (the Chrome Secure Shell terminal): 1. Under certain circumstances, the window title (set by nvim [i0]) would appear over the line I was typing, corrupting the screen. 2. If I changed my $TERM from xterm-256color to the new hterm-256color (available since ncurses >=20210320), the window title corruption was gone, but pane scrolling was broken. Both problems are due to changes in the termcap files, their source of truth being the ncurses project. See "Timeline of ncurses changes" below for details. Cause: title corruption ----------------------- The title corruption when using hterm + TERM=xterm-256color can be explained by event #4 (ncurses 2022-03-12) in the ncurses timeline: The xterm-256color termcap file gained status line termcodes in ncurses 2022-03-12. These termcodes are used by Neovim to set the title when. hterm does not have a status line. Due to ncurses versions earlier than 2022-03-12 missing the xterm status line capability, Neovim manually fixed up [t0] the terminfo file if $TERM was xterm-256color. So if before Neovim manually added fsl/tsl capabilties, and after they were in the termcap file, why did hterm suddenly start getting corruption? The answer is that the termcodes for these capabilties are different when Neovim fixes them up, versus the one in the new termcap database: fsl=\E[0$} // from xterm-256color tsl=\E[2$~\E[1$}\E[%i%p1%d` // from xterm-256color fsl=\x07 // patched by Neovim tsl=\x1b]0; // patched by Neovim hterm ignores the latter, but corrupts the screen with the former. Solution: Make hterm users set hterm-256color, which lacks the new fsl/tsl codes. Also, to reduce superfluous work, stop patching in this capability when hterm is detected (even if hterm would ignore the patched version). Cause: pane corruption ---------------------- The pane corruption when using hterm + TERM=hterm-256color, but NOT when using hterm + TERM=xterm-256color can be explained by: - Neovim uses DECSLRM when available [p1] for performant scrolling. - Both the hterm-256color and xterm-256color termcap databases advertise support for DECSLRM (ncurses timeline #1, #2 and #3). - hterm does not support DESCLRM [p2] (note: it does support DESCTBM for top/bottom scrolling, but it's broken [p3] and not used by Neovim) - xterm-alikes that are not real xterm generally don't support DECSLRM either, so Neovim patches it out [p4]. When using hterm-256color, hterm is no longer considered an xterm-alike by Neovim. As a result, DECSLRM is not cleared. hterm does not support it, so corruption ensues. This is a problem with the hterm-256color termcap file, but we're stuck with it so the best we can do is patch over it. Timeline of ncurses changes --------------------------- 1. 2019-05-19: Part of the DECSLRM capability (smglr AKA set_lr_margin) added to vt420+lrmm, which xterm-256color inherits [n1] 2. 2021-03-20: hterm-256color added, inheriting xterm-256colors. [n2] 3. 2021-09-25: The *parm versions of smglr (AKA set_lr_margin) were added to vt420+lrmm [n3]. Namely: 1. smglp AKA set_left_margin_parm, and 2. smgrp AKA set_right_margin_parm 4. 2022-03-12: (new) codes for fsl, bsl and tsl added to xterm (add dec+sl to xterm-new, per patch #371 -TD) [n4] Fixes #19040. [i0]:3a4fa22bad/src/nvim/tui/tui.c (L1377)[t0]:3a4fa22bad/src/nvim/tui/tui.c (L1728),L1729 [p1]:3a4fa22bad/src/nvim/tui/tui.c (L1196)[p2]: https://bugs.chromium.org/p/chromium/issues/detail?id=1175065&q=component%3APlatform%3EApps%3EDefault%3EHterm [p3]: https://bugs.chromium.org/p/chromium/issues/detail?id=1298796&q=component%3APlatform%3EApps%3EDefault%3EHterm [p4]:3a4fa22bad/src/nvim/tui/tui.c (L1740-L1752)[n1]: https://github.com/mirror/ncurses/commit/8f6d94b8d6211a2323caef53fa4c96c475ec9a6#diff-01544c577762d3308a1d232aa7afc79acf64b9a5057f88a004df82fda89549b7R2742 [n2]:c2650100f8 (diff-01544c577762d3308a1d232aa7afc79acf64b9a5057f88a004df82fda89549b7R5907)[n3]:f6b436c4fb (diff-01544c577762d3308a1d232aa7afc79acf64b9a5057f88a004df82fda89549b7R2842)[n4]:8bf8c836fe (diff-01544c577762d3308a1d232aa7afc79acf64b9a5057f88a004df82fda89549b7R4828)Signed-off-by: Nicolas Hillegeer <nicolas@hillegeer.com>
Documentation | Chat | Twitter
Neovim is a project that seeks to aggressively refactor Vim in order to:
- Simplify maintenance and encourage contributions
- Split the work between multiple developers
- Enable advanced UIs without modifications to the core
- Maximize extensibility
See the Introduction wiki page and Roadmap for more information.
Features
- Modern GUIs
- API access from any language including C/C++, C#, Clojure, D, Elixir, Go, Haskell, Java, JavaScript/Node.js, Julia, Lisp, Lua, Perl, Python, Racket, Ruby, Rust
- Embedded, scriptable terminal emulator
- Asynchronous job control
- Shared data (shada) among multiple editor instances
- XDG base directories support
- Compatible with most Vim plugins, including Ruby and Python plugins
See :help nvim-features for the full list!
Install from package
Pre-built packages for Windows, macOS, and Linux are found on the Releases page.
Managed packages are in Homebrew, Debian, Ubuntu, Fedora, Arch Linux, Void Linux, Gentoo, and more!
Install from source
See the Building Neovim wiki page for details.
The build is CMake-based, but a Makefile is provided as a convenience. After installing the dependencies, run the following command.
make CMAKE_BUILD_TYPE=RelWithDebInfo
sudo make install
To install to a non-default location:
make CMAKE_BUILD_TYPE=RelWithDebInfo CMAKE_INSTALL_PREFIX=/full/path/
make install
CMake hints for inspecting the build:
cmake --build build --target helplists all build targets.build/CMakeCache.txt(orcmake -LAH build/) contains the resolved values of all CMake variables.build/compile_commands.jsonshows the full compiler invocations for each translation unit.
Transitioning from Vim
See :help nvim-from-vim for instructions.
Project layout
├─ ci/ build automation
├─ cmake/ CMake utils
├─ cmake.config/ CMake defines
├─ cmake.deps/ subproject to fetch and build dependencies (optional)
├─ runtime/ plugins and docs
├─ src/nvim/ application source code (see src/nvim/README.md)
│ ├─ api/ API subsystem
│ ├─ eval/ VimL subsystem
│ ├─ event/ event-loop subsystem
│ ├─ generators/ code generation (pre-compilation)
│ ├─ lib/ generic data structures
│ ├─ lua/ Lua subsystem
│ ├─ msgpack_rpc/ RPC subsystem
│ ├─ os/ low-level platform code
│ └─ tui/ built-in UI
└─ test/ tests (see test/README.md)
License
Neovim contributions since b17d96 are licensed under the
Apache 2.0 license, except for contributions copied from Vim (identified by the
vim-patch token). See LICENSE for details.
Vim is Charityware. You can use and copy it as much as you like, but you are
encouraged to make a donation for needy children in Uganda. Please see the
kcc section of the vim docs or visit the ICCF web site, available at these URLs:
http://iccf-holland.org/
http://www.vim.org/iccf/
http://www.iccf.nl/
You can also sponsor the development of Vim. Vim sponsors can vote for
features. The money goes to Uganda anyway.
