feat(lsp): smart completions for :RustAnalyzer subcommands

CHANGELOG.md

@@ -11,6 +11,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - `:RustAnalyzer restart` command.
+- Smarter completions for `:RustAnalyzer` commands.
+  - Only suggest `start` command if there is no
+    active client for the current buffer
+  - Only suggest `stop` and `restart` if there is an
+    active client for the current buffer
 
 ## [3.14.0] - 2024-01-10
 

lua/rustaceanvim/init.lua

@@ -14,6 +14,7 @@
 ---
 --- `:RustAnalyzer start` - Start the LSP client.
 --- `:RustAnalyzer stop` - Stop the LSP client.
+--- `:RustAnalyzer restart` - Restart the LSP client.
 ---
 ---The `:RustLsp` command is available after the LSP client has initialized.
 ---It accepts the following subcommands:

lua/rustaceanvim/lsp.lua

@@ -283,8 +283,9 @@ vim.api.nvim_create_user_command('RustAnalyzer', rust_analyzer_cmd, {
   nargs = '+',
   desc = 'Starts or stops the rust-analyzer LSP client',
   complete = function(arg_lead, cmdline, _)
+    local clients = rust_analyzer.get_active_rustaceanvim_clients()
     ---@type RustAnalyzerCmd[]
-    local commands = vim.tbl_keys(RustAnalyzerCmd)
+    local commands = #clients == 0 and { 'start' } or { 'stop', 'restart' }
     if cmdline:match('^RustAnalyzer%s+%w*$') then
       return vim.tbl_filter(function(command)
         return command:find(arg_lead) ~= nil