From 2d687154968e7a12345fe6167b538cd8488114cb Mon Sep 17 00:00:00 2001
From: Michael Lingelbach <m.j.lbach@gmail.com>
Date: Wed, 14 Apr 2021 01:34:10 -0700
Subject: LspStart: make start all matching clients by default

---
 README.md         |  2 +-
 lua/lspconfig.lua | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 60cdc004..d135cccd 100644
--- a/README.md
+++ b/README.md
@@ -39,7 +39,7 @@ omnifunc completion
 
 The following support tab-completion for all arguments:
 
-* `:LspStart <config_name>` Start the requested server name. Will only succesfully start if the command detects a root directory matching the current config. Pass `autostart = false` to your `.setup{}` call for a language server if you would like to launch clients solely with this command.
+* `:LspStart <config_name>` Start the requested server name. Will only succesfully start if the command detects a root directory matching the current config. Pass `autostart = false` to your `.setup{}` call for a language server if you would like to launch clients solely with this command. Defaults to all servers matching current buffer filetype.
 * `:LspStop <client_id>` Defaults to stopping all buffer clients. 
 * `:LspRestart <client_id>` Defaults to restarting all buffer clients.
 
diff --git a/lua/lspconfig.lua b/lua/lspconfig.lua
index ba8660ec..a901a1a2 100644
--- a/lua/lspconfig.lua
+++ b/lua/lspconfig.lua
@@ -24,9 +24,22 @@ function M._root._setup()
     };
     LspStart = {
       function(server_name)
-        require('lspconfig')[server_name].autostart()
+        if server_name then
+          require('lspconfig')[server_name].autostart()
+        else
+          local buffer_filetype = vim.bo.filetype
+          for client_name, config in pairs(configs) do
+            if config.filetypes then
+              for _, filetype_match in ipairs(config.filetypes) do
+                if buffer_filetype == filetype_match then
+                  require('lspconfig')[client_name].autostart()
+                end
+              end
+            end
+          end
+        end
       end;
-      "-nargs=1 -complete=custom,v:lua.lsp_complete_configured_servers";
+      "-nargs=? -complete=custom,v:lua.lsp_complete_configured_servers";
       description = '`:LspStart` Manually launches a language server.';
     };
     LspStop = {
-- 
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