perf(rocks): vim.fn.executable is slow on WSL2, so only check for luarocks when needed. Closes #1585

lua/lazy/core/config.lua

@@ -49,8 +49,11 @@ M.defaults = {
     enabled = true,
     root = vim.fn.stdpath("data") .. "/lazy-rocks",
     server = "https://nvim-neorocks.github.io/rocks-binaries/",
-    -- use hererocks to install luarocks.
-    hererocks = vim.fn.executable("luarocks") == 0,
+    -- use hererocks to install luarocks?
+    -- set to `nil` to use hererocks when luarocks is not found
+    -- set to `true` to always use hererocks
+    -- set to `false` to always use luarocks
+    hererocks = nil,
   },
   dev = {
     ---@type string | fun(plugin: LazyPlugin): string directory where you store your local plugin projects
@@ -218,6 +221,13 @@ M.defaults = {
   debug = false,
 }
 
+function M.hererocks()
+  if M.options.rocks.hererocks == nil then
+    M.options.rocks.hererocks = vim.fn.executable("luarocks") == 0
+  end
+  return M.options.rocks.hererocks
+end
+
 M.version = "11.8.1" -- x-release-please-version
 
 M.ns = vim.api.nvim_create_namespace("lazy")

lua/lazy/core/plugin.lua

@@ -336,16 +336,16 @@ function M.load()
   end
 
   -- add hererocks when enabled and needed
-  if Config.options.rocks.hererocks then
-    for _, plugin in pairs(Config.spec.plugins) do
-      if plugin.build == "rockspec" then
+  for _, plugin in pairs(Config.spec.plugins) do
+    if plugin.build == "rockspec" then
+      if Config.hererocks() then
         Config.spec.meta:add({
           "luarocks/hererocks",
           build = "rockspec",
           lazy = true,
         })
-        break
       end
+      break
     end
   end