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try
    set state to (do shell script "defaults read com.apple.finder AppleShowAllFiles") as boolean
on error
    set state to false
end try

do shell script "defaults write com.apple.finder AppleShowAllFiles " & (not state)

try
    tell application "Finder"
        set w to front window
        set t to (get target of w)
        if t is not startup disk then
            set the target of w to startup disk
        else
            set the target of w to home
        end if
        set the target of w to t
    end tell
end try

tell application (path to frontmost application as text)
    display notification "ShowAllFiles is now " & (not state)
end tell