namespace eval rand_id {
 
    # Le masque de l'ident, les ? seront remplacés par
    # un caractère de la liste "chars"
    variable pattern "hello???"
    
    # Liste des caractères de remplacement autorisés
    variable chars {
        "0" "1" "2" "3" "4" "5" "6" "7" "8" "9"
        "a" "b" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m"
        "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"
        "_" "-"
    }
    
 
    # renvoit un caractère au hasard
    proc rndchr {} {
        return [lindex $rand_id::chars [rand [llength $rand_id::chars]]]
    }
    
    # Remplace tous les ? du masque
    proc randomize {pattern} {
        set out ""
        foreach {chr [split $rand_id::pattern ""]} {
            append out [if {[string eq $chr "?"]} {rand_id::rndchr} {set chr}]
        }
        return $out
    }
    
    # Bind sur la connexion au serveur
    bind evnt - "connect-server" ident
    proc ident {evnt} {
        set ::username rand_id::randomize
    }
}

variable pattern "?????"
variable chars { "0" "1" "2" "3" "4" "5" "6" "7" "8" "9" }