add Evernote plugin to export highlights and notes

The "My Clipping" file that storing highlights and notes for Kindle
native readers could also be parsed and exported. The parser is
implemented in `evernote.koplugin/clip.lua`.

Parsed highlights and notes in one book will be packed and rendered
into html node with a slt2 template `note.tpl` that complies with
evernote markup language(ENML).

Finally the evernote client will create or update note entries and
push them to Evernote cloud.

frontend/ui/widget/inputtext.lua

@@ -3,9 +3,13 @@ local ScrollTextWidget = require("ui/widget/scrolltextwidget")
 local TextBoxWidget = require("ui/widget/textboxwidget")
 local FrameContainer = require("ui/widget/container/framecontainer")
 local VirtualKeyboard = require("ui/widget/virtualkeyboard")
-local Font = require("ui/font")
-local Screen = require("ui/screen")
+local GestureRange = require("ui/gesturerange")
 local UIManager = require("ui/uimanager")
+local Geom = require("ui/geometry")
+local Device = require("ui/device")
+local Screen = require("ui/screen")
+local Font = require("ui/font")
+local DEBUG = require("dbg")
 
 local InputText = InputContainer:new{
     text = "",
@@ -13,40 +17,51 @@ local InputText = InputContainer:new{
     charlist = {}, -- table to store input string
     charpos = 1,
     input_type = nil,
-    
+    text_type = nil,
+
     width = nil,
     height = nil,
     face = Font:getFace("cfont", 22),
-    
+
     padding = 5,
     margin = 5,
     bordersize = 2,
-    
+
     parent = nil, -- parent dialog that will be set dirty
     scroll = false,
+    focused = true,
 }
 
 function InputText:init()
     self:StringToCharlist(self.text)
     self:initTextBox()
     self:initKeyboard()
+    if Device:isTouchDevice() then
+        self.ges_events = {
+            TapTextBox = {
+                GestureRange:new{
+                    ges = "tap",
+                    range = self.dimen
+                }
+            }
+        }
+    end
 end
 
 function InputText:initTextBox()
-    local bgcolor = nil
-    local fgcolor = nil
-    if self.text == "" then
-        self.text = self.hint
-        bgcolor = 0.0
-        fgcolor = 0.5
-    else
-        bgcolor = 0.0
-        fgcolor = 1.0
-    end
+    local bgcolor, fgcolor = 0.0, self.text == "" and 0.5 or 1.0
+
     local text_widget = nil
+    local show_text = self.text
+    if self.text_type == "password" and show_text ~= "" then
+        show_text = self.text:gsub("(.-).", function() return "*" end)
+        show_text = show_text:gsub("(.)$", function() return self.text:sub(-1) end)
+    elseif show_text == "" then
+        show_text = self.hint
+    end
     if self.scroll then
         text_widget = ScrollTextWidget:new{
-            text = self.text,
+            text = show_text,
             face = self.face,
             bgcolor = bgcolor,
             fgcolor = fgcolor,
@@ -55,7 +70,7 @@ function InputText:initTextBox()
         }
     else
         text_widget = TextBoxWidget:new{
-            text = self.text,
+            text = show_text,
             face = self.face,
             bgcolor = bgcolor,
             fgcolor = fgcolor,
@@ -67,6 +82,7 @@ function InputText:initTextBox()
         bordersize = self.bordersize,
         padding = self.padding,
         margin = self.margin,
+        color = self.focused and 15 or 8,
         text_widget,
     }
     self.dimen = self[1]:getSize()
@@ -85,6 +101,22 @@ function InputText:initKeyboard()
     }
 end
 
+function InputText:onTapTextBox()
+    if self.parent.onSwitchFocus then
+        self.parent:onSwitchFocus(self)
+    end
+end
+
+function InputText:unfocus()
+    self.focused = false
+    self[1].color = 8
+end
+
+function InputText:focus()
+    self.focused = true
+    self[1].color = 15
+end
+
 function InputText:onShowKeyboard()
     UIManager:show(self.keyboard)
 end