My second LUA script

-- Based on the mosaic.lua script

dt = require "darktable"
dt.register_event("shortcut",
    function()
        dt.print_error("Will try to deinterlace now")
        for _,v in pairs(dt.gui.selection()) do
            command = "/home/polarfox/Dropbox/cr2hdr "..v.path.."/"..v.filename
            dt.print_error("this is the command: "..command)
            os.execute(command)
            dng=string.gsub(v.filename,"(.*).[cC][rR]2$","%1.DNG")
            dt.print("HDR saved to "..v.path.."/"..dng)
            dt.database.import(v.path.."/"..dng)
        end
    end
,"Duplicate as dual iso DNG")