[imp] patch for imp signature compose

[Vijay Mahrra]

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hi,

i've been experimenting with horde hooks and i decided to write a hook to 
randomise my signature when composing new messages with imp, which basically 
replaces %FORTUNE% with a call to the system fortune cookie program.

the function to go into hooks.php in horde and a patch against compose.php are 
attached to this message, perhaps they need to work with with the existing 
_prefs_hook_signature - i'm not sure how this works or should relate if at 
all with imp (from horde/config/hooks.php.dist):

    function _prefs_hook_signature($username = null)
    {
        $sig = $GLOBALS['prefs']->getValue('signature');
        if (preg_match('/%TAG%/', $sig)) {
            $tag = `cat /usr/share/tagline`;
            $sig = preg_replace('|%TAG%|', $tag, $sig);
        }
        return $sig;
    }

what is $username there for if it is not being used?  or am i missing 
something?

i hope that someone finds this patch amusing ;)

vijay
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