extract function

Author: tatsumoto-ren

mpvacious/helpers.lua

@@ -425,35 +425,32 @@ function this.find_mpv_script_opts_directory()
     return utils.join_path(this.find_mpv_config_directory(), "script-opts")
 end
 
+local function searchpath_lua51_fallback(name, path)
+    --- mpv may embed Lua 5.1/LuaJIT, whe-re package.searchpath is unavailable.
+    --- This affects common builds such as Homebrew mpv on macOS, which links
+    --- against a Lua 5.1-compatible runtime.
+    local module_file = name:gsub("%.", "/")
+
+    for template in path:gmatch("[^;]+") do
+        local candidate = template:gsub("%?", module_file)
+        local file = io.open(candidate, "r")
+
+        if file ~= nil then
+            file:close()
+            return candidate
+        end
+    end
+
+    return nil
+end
+
 function this.maybe_require(module_name)
     --- Example: ~/.config/mpv/scripts/mpvacious_custom_subtitle_filter/custom_subtitle_filter.lua
 
     -- Make path to directory ~/.config/mpv/scripts/mpvacious_custom_subtitle_filter
     local external_scripts_path = utils.join_path(this.find_mpv_scripts_dir(), "mpvacious_" .. module_name)
     local search_template = external_scripts_path .. "/?.lua;"
-    local searchpath = package.searchpath
-
-    -- mpv may embed Lua 5.1/LuaJIT, where package.searchpath is unavailable.
-    -- This affects common builds such as Homebrew mpv on macOS, which links
-    -- against a Lua 5.1-compatible runtime.
-    if searchpath == nil then
-        searchpath = function(name, path)
-            local module_file = name:gsub("%.", "/")
-
-            for template in path:gmatch("[^;]+") do
-                local candidate = template:gsub("%?", module_file)
-                local file = io.open(candidate, "r")
-
-                if file ~= nil then
-                    file:close()
-                    return candidate
-                end
-            end
-
-            return nil
-        end
-    end
-
+    local searchpath = package.searchpath or searchpath_lua51_fallback
     local module_path = searchpath(module_name, search_template)
 
     if not module_path then