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
 

lua/lazy/health.lua

@@ -125,7 +125,7 @@ function M.check()
 
   start("luarocks")
   if Config.options.rocks.enabled then
-    if Config.options.rocks.hererocks then
+    if Config.hererocks() then
       info("checking `hererocks` installation")
     else
       info("checking `luarocks` installation")
@@ -155,7 +155,7 @@ function M.check()
         "Lazy won't be able to install plugins that require `luarocks`.",
         "Here's what you can do:",
         " - fix your `luarocks` installation",
-        Config.options.rocks.hererocks and " - disable *hererocks* with `opts.rocks.hererocks = false`"
+        Config.hererocks() and " - disable *hererocks* with `opts.rocks.hererocks = false`"
           or " - enable `hererocks` with `opts.rocks.hererocks = true`",
         " - disable `luarocks` support completely with `opts.rocks.enabled = false`",
       }, "\n"))

lua/lazy/pkg/rockspec.lua

@@ -72,7 +72,7 @@ function M.check(opts)
   }, opts or {})
 
   local ok = false
-  if Config.options.rocks.hererocks then
+  if Config.hererocks() then
     if M.hererocks.building() then
       ok = true
     else
@@ -119,7 +119,7 @@ function M.build(task)
       "",
       "This plugin requires `luarocks`. Try one of the following:",
       " - fix your `luarocks` installation",
-      Config.options.rocks.hererocks and " - disable *hererocks* with `opts.rocks.hererocks = false`"
+      Config.hererocks() and " - disable *hererocks* with `opts.rocks.hererocks = false`"
         or " - enable `hererocks` with `opts.rocks.hererocks = true`",
       " - disable `luarocks` support completely with `opts.rocks.enabled = false`",
     })
@@ -132,7 +132,7 @@ function M.build(task)
 
   local env = {}
   local luarocks = "luarocks"
-  if Config.options.rocks.hererocks then
+  if Config.hererocks() then
     -- hererocks is still building, so skip for now
     -- a new build will happen in the next round
     if M.hererocks.building() then