docs: lsp, emoji, startup #33446

Co-authored-by: Maria José Solano <majosolano99@gmail.com>

6 files changed, 73 insertions, 30 deletions

diff --git a/runtime/lua/vim/_meta/options.lua b/runtime/lua/vim/_meta/options.lua
index 1e0e40a3a3..b06334ba31 100644
--- a/runtime/lua/vim/_meta/options.lua
+++ b/runtime/lua/vim/_meta/options.lua
@@ -2084,6 +2084,15 @@ vim.bo.et = vim.bo.expandtab
 --- - 'exrc' can execute any code; editorconfig only specifies settings.
 --- - 'exrc' is Nvim-specific; editorconfig works in other editors.
 ---
+--- To achieve project-local LSP configuration:
+--- 1. Enable 'exrc'.
+--- 2. Place LSP configs at ".nvim/lsp/*.lua" in your project root.
+--- 3. Create ".nvim.lua" in your project root directory with this line:
+---
+--- ```lua
+---      vim.cmd[[set runtimepath+=.nvim]]
+--- ```
+---
 --- This option cannot be set from a `modeline` or in the `sandbox`, for
 --- security reasons.
 ---
@@ -6442,8 +6451,7 @@ vim.o.stc = vim.o.statuscolumn
 vim.wo.statuscolumn = vim.o.statuscolumn
 vim.wo.stc = vim.wo.statuscolumn
 
---- When non-empty, this option determines the content of the status line.
---- Also see `status-line`.
+--- Sets the `status-line`.
 ---
 --- The option consists of printf style '%' items interspersed with
 --- normal text.  Each status line item is of the form:
diff --git a/runtime/lua/vim/fs.lua b/runtime/lua/vim/fs.lua
index 8862afc760..1a99627347 100644
--- a/runtime/lua/vim/fs.lua
+++ b/runtime/lua/vim/fs.lua
@@ -6,7 +6,7 @@
 ---
 --- >lua
 ---   if vim.uv.fs_stat(file) then
----     vim.print("file exists")
+---     vim.print('file exists')
 ---   end
 --- <
 
@@ -19,21 +19,21 @@ local sysname = uv.os_uname().sysname:lower()
 local iswin = not not (sysname:find('windows') or sysname:find('mingw'))
 local os_sep = iswin and '\\' or '/'
 
---- Iterate over all the parents of the given path.
+--- Iterate over all the parents of the given path (not expanded/resolved, the caller must do that).
 ---
 --- Example:
 ---
 --- ```lua
 --- local root_dir
 --- for dir in vim.fs.parents(vim.api.nvim_buf_get_name(0)) do
----   if vim.fn.isdirectory(dir .. "/.git") == 1 then
+---   if vim.fn.isdirectory(dir .. '/.git') == 1 then
 ---     root_dir = dir
 ---     break
 ---   end
 --- end
 ---
 --- if root_dir then
----   print("Found git repository at", root_dir)
+---   print('Found git repository at', root_dir)
 --- end
 --- ```
 ---
@@ -55,7 +55,7 @@ function M.parents(start)
     start
 end
 
---- Return the parent directory of the given path
+--- Gets the parent directory of the given path (not expanded/resolved, the caller must do that).
 ---
 ---@since 10
 ---@generic T : string|nil
@@ -234,16 +234,17 @@ end
 --- Examples:
 ---
 --- ```lua
---- -- list all test directories under the runtime directory
---- local test_dirs = vim.fs.find(
----   {'test', 'tst', 'testdir'},
----   {limit = math.huge, type = 'directory', path = './runtime/'}
+--- -- List all test directories under the runtime directory.
+--- local dirs = vim.fs.find(
+---   { 'test', 'tst', 'testdir' },
+---   { limit = math.huge, type = 'directory', path = './runtime/' }
 --- )
 ---
---- -- get all files ending with .cpp or .hpp inside lib/
---- local cpp_hpp = vim.fs.find(function(name, path)
+--- -- Get all "lib/*.cpp" and "lib/*.hpp" files, using Lua patterns.
+--- -- Or use `vim.glob.to_lpeg(…):match(…)` for glob/wildcard matching.
+--- local files = vim.fs.find(function(name, path)
 ---   return name:match('.*%.[ch]pp$') and path:match('[/\\]lib$')
---- end, {limit = math.huge, type = 'file'})
+--- end, { limit = math.huge, type = 'file' })
 --- ```
 ---
 ---@since 10
diff --git a/runtime/lua/vim/lsp.lua b/runtime/lua/vim/lsp.lua
index a117217f17..55a5ab6cf4 100644
--- a/runtime/lua/vim/lsp.lua
+++ b/runtime/lua/vim/lsp.lua
@@ -282,15 +282,16 @@ end
 --- If not provided, then the client will attach to all filetypes.
 --- @field filetypes? string[]
 ---
---- Directory markers (.e.g. '.git/') where the LSP server will base its workspaceFolders,
---- rootUri, and rootPath on initialization. Unused if `root_dir` is provided.
+--- Directory markers (.e.g. '.git/') where the LSP server will base its workspaceFolders, rootUri,
+--- and rootPath on initialization. Unused if `root_dir` is provided.
 --- @field root_markers? string[]
 ---
---- Directory where the LSP server will base its workspaceFolders, rootUri, and
---- rootPath on initialization. If a function, it is passed the buffer number
---- and a callback argument which must be called with the value of root_dir to
---- use. The LSP server will not be started until the callback is called.
---- @field root_dir? string|fun(bufnr: integer, cb:fun(root_dir?:string))
+--- [lsp-root_dir()]() Directory where the LSP server will base its workspaceFolders, rootUri, and
+--- rootPath on initialization. The function form receives a buffer number and `on_dir` callback,
+--- which must be called to provide root_dir as a string. LSP will not be activated for the buffer
+--- unless `on_dir` is called; thus a `root_dir()` function can dynamically decide whether to
+--- activate (or skip) LSP per-buffer. See example at |vim.lsp.enable()|.
+--- @field root_dir? string|fun(bufnr: integer, on_dir:fun(root_dir?:string))
 ---
 --- Predicate used to decide if a client should be re-used. Used on all
 --- running clients. The default implementation re-uses a client if name and
@@ -538,16 +539,27 @@ local function lsp_enable_callback(bufnr)
   end
 end
 
---- Enable an LSP server to automatically start when opening a buffer.
----
---- Uses configuration defined with `vim.lsp.config`.
+--- Auto-starts LSP when a buffer is opened, based on the |lsp-config| `filetypes`, `root_markers`,
+--- and `root_dir` fields.
 ---
 --- Examples:
 ---
 --- ```lua
----   vim.lsp.enable('clangd')
+--- vim.lsp.enable('clangd')
+--- vim.lsp.enable({'luals', 'pyright'})
+--- ```
+---
+--- Example: To _dynamically_ decide whether LSP is activated, define a |lsp-root_dir()| function
+--- which calls `on_dir()` only when you want that config to activate:
 ---
----   vim.lsp.enable({'luals', 'pyright'})
+--- ```lua
+--- vim.lsp.config('lua_ls', {
+---   root_dir = function(bufnr, on_dir)
+---     if not vim.fn.bufname(bufnr):match('%.txt$') then
+---       on_dir(vim.fn.getcwd())
+---     end
+---   end
+--- })
 --- ```
 ---
 ---@since 13
diff --git a/runtime/lua/vim/lsp/buf.lua b/runtime/lua/vim/lsp/buf.lua
index e6ffc8360e..aac9965f42 100644
--- a/runtime/lua/vim/lsp/buf.lua
+++ b/runtime/lua/vim/lsp/buf.lua
@@ -1211,8 +1211,7 @@ local function on_code_action_results(results, opts)
   vim.ui.select(actions, select_opts, on_user_choice)
 end
 
---- Selects a code action available at the current
---- cursor position.
+--- Selects a code action (LSP: "textDocument/codeAction" request) available at cursor position.
 ---
 ---@param opts? vim.lsp.buf.code_action.Opts
 ---@see https://microsoft.github.io/language-server-protocol/specifications/specification-current/#textDocument_codeAction
diff --git a/runtime/lua/vim/lsp/client.lua b/runtime/lua/vim/lsp/client.lua
index a362287570..cd78bab3e8 100644
--- a/runtime/lua/vim/lsp/client.lua
+++ b/runtime/lua/vim/lsp/client.lua
@@ -63,7 +63,9 @@ local validate = vim.validate
 --- folder in this list. See `workspaceFolders` in the LSP spec.
 --- @field workspace_folders? lsp.WorkspaceFolder[]
 ---
---- (default false) Server requires a workspace (no "single file" support).
+--- (default false) Server requires a workspace (no "single file" support). Note: Without
+--- a workspace, cross-file features (navigation, hover) may or may not work depending on the
+--- language server, even if the server doesn't require a workspace.
 --- @field workspace_required? boolean
 ---
 --- Map overriding the default capabilities defined by |vim.lsp.protocol.make_client_capabilities()|,
diff --git a/runtime/lua/vim/lsp/log.lua b/runtime/lua/vim/lsp/log.lua
index e28a856215..2dccd86ecd 100644
--- a/runtime/lua/vim/lsp/log.lua
+++ b/runtime/lua/vim/lsp/log.lua
@@ -1,4 +1,25 @@
--- Logger for language client plugin.
+--- @brief
+--- The `vim.lsp.log` module provides logging for the Nvim LSP client.
+---
+--- When debugging language servers, it is helpful to enable extra-verbose logging of the LSP client
+--- RPC events. Example:
+--- ```lua
+--- vim.lsp.set_log_level 'trace'
+--- require('vim.lsp.log').set_format_func(vim.inspect)
+--- ```
+---
+--- Then try to run the language server, and open the log with:
+--- ```vim
+--- :lua vim.cmd('tabnew ' .. vim.lsp.get_log_path())
+--- ```
+---
+--- (Or use `:LspLog` if you have nvim-lspconfig installed.)
+---
+--- Note:
+--- - Remember to DISABLE verbose logging ("debug" or "trace" level), else you may encounter
+---   performance issues.
+--- - "ERROR" messages containing "stderr" only indicate that the log was sent to stderr. Many
+---   servers send harmless messages via stderr.
 
 local log = {}