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bind -a(see el_bind/2) and Goal is called of the associated key-binding is activated. Goal is called as
call(:Goal, +Input, +Char, -Continue)
where Input is the input stream providing access to the editor, Char
the activating character and Continue must be instantated with one
of the known continuation codes as defined by libedit:
fatal. In addition, the following Continue
code is provided.
The registered Goal typically used el_line/2 to fetch the input line and el_cursor/2, el_insertstr/2 and/or el_deletestr/2 to manipulate the input line.
Normally el_bind/2 is used to associate the defined command with a keyboard sequence.