Show a message, when KOReader was updated on next start.

09-UpgradeMessage.lua

-- a patch for showing a message after an update of KOReader

local lfs = require("libs/libkoreader-lfs")
local DataStorage = require("datastorage")
local ffiutil = require("ffi/util")

local patch_dir = DataStorage:getDataDir() .. "/patches"

if lfs.attributes(patch_dir .. "/09-UpgradeMessage.lua", "mode") == "file" then
    os.remove(patch_dir .. "/29-UpgradeMessage.lua") -- to be safe, as there coulde be a patch with that name ;)
    os.rename(patch_dir .. "/09-UpgradeMessage.lua", patch_dir .. "/29-UpgradeMessage.lua")
    return
end


-- this part is executed delayed (=UserPatch.late), when it was renamed to 29-UpgradeMessage.lua

os.remove(patch_dir .. "/09-UpgradeMessage.lua") -- just to be safe (should not be necessary)
os.rename(patch_dir .. "/29-UpgradeMessage.lua", patch_dir .. "/09-UpgradeMessage.lua")

local UIManager = require("ui/uimanager")
local InfoMessage = require("ui/widget/infomessage")
UIManager:show(InfoMessage:new{
    text = "   KOReader was updated.",
    show_icon = false,
})