luasettings: new module to handle genric settings

also use luasettings for reader settings

frontend/luasettings.lua

@@ -0,0 +1,52 @@
+local dump = require("dump")
+
+local LuaSettings = {}
+
+function LuaSettings:open(file_path)
+    local new = {file=file_path}
+    local ok, stored
+
+    ok, stored = pcall(dofile, new.file)
+    if ok and stored then
+        new.data = stored
+    else
+        new.data = {}
+    end
+
+    return setmetatable(new, {__index = LuaSettings})
+end
+
+function LuaSettings:readSetting(key)
+    return self.data[key]
+end
+
+function LuaSettings:saveSetting(key, value)
+    self.data[key] = value
+end
+
+function LuaSettings:delSetting(key)
+    self.data[key] = nil
+end
+
+function LuaSettings:flush()
+    local f_out = io.open(self.file, "w")
+    if f_out ~= nil then
+        os.setlocale('C', 'numeric')
+        f_out:write("-- we can read Lua syntax here!\nreturn ")
+        f_out:write(dump(self.data))
+        f_out:write("\n")
+        f_out:close()
+    end
+end
+
+function LuaSettings:close()
+    self:flush()
+end
+
+function LuaSettings:purge()
+    if self.file then
+        os.remove(self.file)
+    end
+end
+
+return LuaSettings

reader.lua

@@ -25,12 +25,12 @@ if ffi.os == "Windows" then
     ffi.C._putenv("PATH=libs;common;")
 end
 
-local DocSettings = require("docsettings")
 local _ = require("gettext")
 -- read settings and check for language override
 -- has to be done before requiring other files because
 -- they might call gettext on load
-G_reader_settings = DocSettings:open(".reader")
+G_reader_settings = require("luasettings"):open(
+    DataStorage:getDataDir().."/settings.reader.lua")
 local lang_locale = G_reader_settings:readSetting("language")
 if lang_locale then
     _.changeLang(lang_locale)