Add a UI option to set 'read from right to left'

defaults.lua

@@ -95,6 +95,7 @@ DKOPTREADER_CONFIG_AUTO_STRAIGHTEN = 0    -- range from 0 to 10
 DKOPTREADER_CONFIG_JUSTIFICATION = 3    -- -1 = auto, 0 = left, 1 = center, 2 = right, 3 = full
 DKOPTREADER_CONFIG_MAX_COLUMNS = 2        -- range from 1 to 4
 DKOPTREADER_CONFIG_CONTRAST = 1.0        -- range from 0.2 to 2.0
+DKOPTREADER_CONFIG_INVERSE_READING_ORDER = 0 -- 1 = enable, 0 = disable
 
 -- word spacing for reflow
 DKOPTREADER_CONFIG_WORD_SPACINGS = {0.05, -0.2, 0.375}    -- range from (+/-)0.05 to (+/-)0.5

frontend/ui/data/koptoptions.lua

@@ -277,6 +277,13 @@ local KoptOptions = {
                     return enable_if_equals(configurable, "text_wrap", 1)
                 end,
             },
+            {
+               name = "inverse_reading_order",
+               name_text = S.INVERSE_READING_ORDER,
+               toggle = {S.ON, S.OFF},
+               values = {1, 0},
+               default_value = DKOPTREADER_CONFIG_INVERSE_READING_ORDER,
+            },
         }
     },
 }

frontend/ui/data/strings.lua

@@ -28,6 +28,7 @@ S.EMBEDDED_STYLE = _("Embedded Style")
 S.WRITING_DIR = _("Writing Direction")
 S.PROGRESS_BAR = _("Progress Bar")
 S.FORCED_OCR = _("Forced OCR")
+S.INVERSE_READING_ORDER = _("Inverse Order")
 
 S.ON = _("on")
 S.OFF = _("off")