extension/packages/prefs.coffee

   1 { classes: Cc, interfaces: Ci } = Components
   2
   3 PREF_BRANCH = "extension.VimFx.";
   4
   5 # Default values for the preference
   6 # All used preferences should be mentioned here becuase
   7 # preference type is derived from here
   8 PREFS =
   9   addon_id:     'VimFx@akhodakivskiy.github.com'
  10   hint_chars:   'asdfgercvhjkl;uinm'
  11   disabled:     false
  12   scroll_step:  60
  13   black_list:   ''
  14
  15 # Get Firefox preference value of type specified in `PREFS`
  16 getFFPref = do ->
  17   branch = Services.prefs.getBranch PREF_BRANCH
  18
  19   return (key) ->
  20     value = PREFS[key]
  21
  22     # Return default value if the preference value hasn't been set yet
  23     if branch.getPrefType(key) == branch.PREF_INVALID
  24       return value;
  25
  26     switch typeof value
  27       when 'boolean'
  28         return branch.getBoolPref key
  29       when 'number'
  30         return branch.getIntPref key
  31       else
  32         return branch.getCharPref key
  33
  34 # Assign and save Firefox preference value
  35 setFFPref = do ->
  36   branch = Services.prefs.getBranch PREF_BRANCH
  37
  38   return (key, value) ->
  39     switch typeof value
  40       when 'boolean'
  41         branch.setBoolPref(key, value)
  42       when 'number'
  43         branch.setIntPref(key, value)
  44       else
  45         branch.setCharPref(key, String(value));
  46
  47 # Set default values and update previously stored values for the preferences
  48 do ->
  49   branch = Services.prefs.getBranch PREF_BRANCH
  50   for key in Object.keys(PREFS)
  51     if branch.getPrefType(key) == branch.PREF_INVALID
  52       setFFPref key, PREFS[key]
  53     else
  54       PREFS[key] = getFFPref key
  55
  56 # Monitor preference changes and update values in local cache - PREFS
  57 installPrefObserver = ->
  58   branch = Services.prefs.getBranch(PREF_BRANCH)
  59
  60   observer =
  61     observe: (subject, topic, data) ->
  62       if topic == 'nsPref:changed' and data in Object.keys(PREFS)
  63         PREFS[data] = getFFPref data
  64
  65   branch.addObserver "", observer, false
  66   unload -> branch.removeObserver "", observer
  67
  68 # Get preference value from local cache - PREFS
  69 getPref = (key) -> return PREFS[key]
  70
  71 # Set preference value
  72 setPref = (key, value) -> setFFPref key, value
  73
  74 exports.getPref             = getPref
  75 exports.setPref             = setPref
  76 exports.installPrefObserver = installPrefObserver