{ "keys": ["shift+alt+d"], "command": "set_setting", "args":
{
"setting": "draw_white_space",
"value": "all"
}
},
{ "keys": ["shift+alt+a"], "command": "set_setting", "args":
{
"setting": "draw_white_space",
"value": "selection"
}
},

Also, how did you find the existence of the draw_white_space command?

And how can I find the values accepted by the command? 

explore KeyBindings file, or try to find command source code in ST2 Packages in *.py files

also try to write Sublim plugin, and you will learn more about ST2

"draw_white_space": "all",

Preferences -> Settings - User

"ensure_newline_at_eof_on_save": true,

translate_tabs_to_spacesuse_tab_stopsdetect_indentation

in Preferences -> File Settings - Default

hope it help

{ "keys": ["ctrl+alt+o"], "command": "prompt_add_folder" },

    io:format("test if test", []),\n
        |

but i dont know how to resolve this