feat(lsp): completion side effects

runtime/doc/lsp.txt

@@ -1604,6 +1604,32 @@ save({lenses}, {bufnr}, {client_id})                 *vim.lsp.codelens.save()*
       • {client_id}  (`integer`)
 
 
+==============================================================================
+Lua module: vim.lsp.completion                                *lsp-completion*
+
+*vim.lsp.completion.BufferOpts*
+
+    Fields: ~
+      • {autotrigger}?  (`boolean`) Whether to trigger completion
+                        automatically. Default: false
+
+
+                                                 *vim.lsp.completion.enable()*
+enable({enable}, {client_id}, {bufnr}, {opts})
+    Enables or disables completions from the given language client in the
+    given buffer.
+
+    Parameters: ~
+      • {enable}     (`boolean`) True to enable, false to disable
+      • {client_id}  (`integer`) Client ID
+      • {bufnr}      (`integer`) Buffer handle, or 0 for the current buffer
+      • {opts}       (`vim.lsp.completion.BufferOpts?`) See
+                     |vim.lsp.completion.BufferOpts|.
+
+trigger()                                       *vim.lsp.completion.trigger()*
+    Trigger LSP completion in the current buffer.
+
+
 ==============================================================================
 Lua module: vim.lsp.inlay_hint                                *lsp-inlay_hint*
 

runtime/doc/news.txt

@@ -85,6 +85,12 @@ DEFAULTS
   - |gra| in Normal and Visual mode maps to |vim.lsp.buf.code_action()|
   - CTRL-S in Insert mode maps to |vim.lsp.buf.signature_help()|
 
+• Snippet:
+  - `<Tab>` in Insert and Select mode maps to |vim.snippet.jump({ direction = 1 })|
+    when a snippet is active and jumpable forwards.
+  - `<S-Tab>` in Insert and Select mode maps to |vim.snippet.jump({ direction = -1 })|
+    when a snippet is active and jumpable backwards.
+
 EDITOR
 
 • TODO
@@ -95,7 +101,8 @@ EVENTS
 
 LSP
 
-• TODO
+• Completion side effects (including snippet expansion, execution of commands
+  and application of additional text edits) is now built-in.
 
 LUA
 

runtime/lua/vim/lsp.lua

@@ -3,14 +3,14 @@ local validate = vim.validate
 
 local lsp = vim._defer_require('vim.lsp', {
   _changetracking = ..., --- @module 'vim.lsp._changetracking'
-  _completion = ..., --- @module 'vim.lsp._completion'
   _dynamic = ..., --- @module 'vim.lsp._dynamic'
   _snippet_grammar = ..., --- @module 'vim.lsp._snippet_grammar'
   _tagfunc = ..., --- @module 'vim.lsp._tagfunc'
   _watchfiles = ..., --- @module 'vim.lsp._watchfiles'
   buf = ..., --- @module 'vim.lsp.buf'
   client = ..., --- @module 'vim.lsp.client'
   codelens = ..., --- @module 'vim.lsp.codelens'
+  completion = ..., --- @module 'vim.lsp.completion'
   diagnostic = ..., --- @module 'vim.lsp.diagnostic'
   handlers = ..., --- @module 'vim.lsp.handlers'
   inlay_hint = ..., --- @module 'vim.lsp.inlay_hint'
@@ -1002,8 +1002,7 @@ end
 --- - findstart=0: column where the completion starts, or -2 or -3
 --- - findstart=1: list of matches (actually just calls |complete()|)
 function lsp.omnifunc(findstart, base)
-  log.debug('omnifunc.findstart', { findstart = findstart, base = base })
-  return vim.lsp._completion.omnifunc(findstart, base)
+  return vim.lsp.completion._omnifunc(findstart, base)
 end
 
 --- @class vim.lsp.formatexpr.Opts

runtime/lua/vim/lsp/client.lua

@@ -869,7 +869,8 @@ end
 --- @param command lsp.Command
 --- @param context? {bufnr: integer}
 --- @param handler? lsp.Handler only called if a server command
-function Client:_exec_cmd(command, context, handler)
+--- @param on_unsupported? function handler invoked when the command is not supported by the client.
+function Client:_exec_cmd(command, context, handler, on_unsupported)
   context = vim.deepcopy(context or {}, true) --[[@as lsp.HandlerContext]]
   context.bufnr = context.bufnr or api.nvim_get_current_buf()
   context.client_id = self.id
@@ -883,14 +884,18 @@ function Client:_exec_cmd(command, context, handler)
   local command_provider = self.server_capabilities.executeCommandProvider
   local commands = type(command_provider) == 'table' and command_provider.commands or {}
   if not vim.list_contains(commands, cmdname) then
-    vim.notify_once(
-      string.format(
-        'Language server `%s` does not support command `%s`. This command may require a client extension.',
-        self.name,
-        cmdname
-      ),
-      vim.log.levels.WARN
-    )
+    if on_unsupported then
+      on_unsupported()
+    else
+      vim.notify_once(
+        string.format(
+          'Language server `%s` does not support command `%s`. This command may require a client extension.',
+          self.name,
+          cmdname
+        ),
+        vim.log.levels.WARN
+      )
+    end
     return
   end
   -- Not using command directly to exclude extra properties,