persist: save_default_lua_version

refactor into a separate function

2 files changed, 17 insertions, 10 deletions

diff --git a/src/luarocks/cmd/config.lua b/src/luarocks/cmd/config.lua
index 5c7cc6c9..e9b2fef4 100644
--- a/src/luarocks/cmd/config.lua
+++ b/src/luarocks/cmd/config.lua
@@ -278,17 +278,10 @@ function config_cmd.command(flags, var, val)
       end
 
       local prefix = dir.dir_name(cfg.config_files[scope].file)
-      local ok, err = fs.make_dir(prefix)
+      local ok, err = persist.save_default_lua_version(prefix, val)
       if not ok then
          return nil, "could not set default Lua version: " .. err
       end
-      local fd, err = io.open(dir.path(prefix, "default-lua-version.lua"), "w")
-      if not fd then
-         return nil, "could not set default Lua version: " .. err
-      end
-      
-      fd:write('return "' .. val .. '"\n')
-      fd:close()
       print("Lua version will default to " .. val .. " in " .. prefix)
    end
    
diff --git a/src/luarocks/persist.lua b/src/luarocks/persist.lua
index b8060ea0..1c4b82b5 100644
--- a/src/luarocks/persist.lua
+++ b/src/luarocks/persist.lua
@@ -1,12 +1,12 @@
 
 --- Utility module for loading files into tables and
 -- saving tables into files.
--- Implemented separately to avoid interdependencies,
--- as it is used in the bootstrapping stage of the cfg module.
 local persist = {}
 
 local core = require("luarocks.core.persist")
 local util = require("luarocks.util")
+local dir = require("luarocks.dir")
+local fs = require("luarocks.fs")
 
 persist.load_into_table = core.load_into_table
 
@@ -239,4 +239,18 @@ function persist.load_config_file_if_basic(filename, cfg)
    return tbl
 end
 
+function persist.save_default_lua_version(prefix, lua_version)
+   local ok, err = fs.make_dir(prefix)
+   if not ok then
+      return nil, err
+   end
+   local fd, err = io.open(dir.path(prefix, "default-lua-version.lua"), "w")
+   if not fd then
+      return nil, err
+   end
+   fd:write('return "' .. lua_version .. '"\n')
+   fd:close()
+   return true
+end
+
 return persist