Neovim 0.9: Further Language Server Protocol, Treesitter, and API Improvements; Changed Features

by language servers include removing unused imports, or formatting the file. • Added preliminary support for the `workspace/didChangeWatchedFiles` capability to the LSP client to notify servers of file changes on disk. The feature is disabled by default and can be enabled by setting the `workspace.didChangeWatchedFiles.dynamicRegistration=true` capability. • |vim.diagnostic| now supports LSP DiagnosticsTag. See: https://microsoft.github.io/language-server-protocol/specification/#diagnosticTag • vim.diagnostic.is_disabled() checks if diagnostics are disabled in a given buffer or namespace. • Treesitter captures can now be transformed by directives. This will allow more complicated dynamic language injections. • |vim.treesitter.get_node_text()| now accepts a `metadata` option for writing custom directives using |vim.treesitter.query.add_directive()|. • |vim.treesitter.language.add()| replaces `vim.treesitter.language.require_language`. • |vim.treesitter.foldexpr()| can be used for 'foldexpr' to use treesitter for folding. • Expanded the TSNode API with: - |TSNode:tree()| - |TSNode:has_changes()| - |TSNode:extra()| - |TSNode:equal()| Additionally |TSNode:range()| now takes an optional {include_bytes} argument. • Treesitter injection queries now use the format described at https://tree-sitter.github.io/tree-sitter/syntax-highlighting#language-injection . Support for the previous format will be removed in a future release. • Added |nvim_get_hl()| for getting highlight group definitions in a format compatible with |nvim_set_hl()|. • |vim.filetype.get_option()| to get the default option value for a specific filetype. This is a wrapper around |nvim_get_option_value()| with caching. • `require'bit'` is now always available |lua-bit| ============================================================================== CHANGED FEATURES The following changes to existing APIs or features add new behavior. • 'exrc' now supports `.nvim.lua` file. • 'exrc' is no longer marked deprecated. • The |TUI| is changed to run in a separate process (previously, a separate thread was used). This is not supposed to be a visible change to the user, but might be the cause of subtle changes of behavior and bugs. Previously, the TUI could be disabled as a build time feature (+tui/-tui), resulting in a nvim binary which only could be run headless or embedded in an external process. As of this version, TUI is always available. • Vim's `has('gui_running')` is now supported as a way for plugins to check if a GUI (not the |TUI|) is attached to Nvim. |has()| • |msgsep| is now always enabled even if 'display' doesn't contain the "msgsep" flag. It is no longer possible to scroll the whole screen when showing messages longer than 'cmdheight'. • API calls now show more information about where an exception happened. • The `win_viewport` UI event now contains information about

This section details continued improvements to Neovim 0.9, including enhancements to Language Server Protocol (LSP) support with file modification capabilities, diagnostics, and file change notifications. It also covers Treesitter improvements, such as capture transformations, new API functions, and updates to injection query formats. Additionally, API enhancements like highlight group definitions and filetype option retrieval are described. The `bit` library is always available. The section also lists changed features, including `.nvim.lua` support for 'exrc', the TUI running in a separate process, support for `has('gui_running')`, message separation always enabled, improved exception information, and updates to the `win_viewport` UI event.