Synopsis:
   on [<modes>]mode [<serial#>] [-|^]<match> { <action> }

Description:
   This hook is triggered whenever the client observes a mode change on a
   channel, or whenever the client changes its modes.

Parameters:
   $0    nickname of person issuing mode change
   $1    channel or nickname affected by mode change
   $2    modes changed
   $3-   arguments to modes (if any)

Examples:
   To distinguish between user modes and channel modes:
      on ^mode "*" {
         if ( [$1] == N ) {
            echo *** User mode change for $1: $2-
         } {
            echo *** Mode change for $1 by $0: $2-
         }
      }

See Also:
   mode(1); on(5) mode_stripped