[erlang-questions] help me to read proper input from commandline erl

João Neves <>
Fri Feb 21 19:07:56 CET 2014


Docopt-erl is also pretty nice since it lets you build your command line
arguments by documenting them properly. :)

https://github.com/plux/docopt-erl

--
João Neves


2014-02-21 18:39 GMT+01:00 Dave Cottlehuber <>:

> Depending how complicated your requirements are, consider using
>
> https://github.com/jcomellas/getopt
>
> I'm sure there are other libraries out there, this is the only one I
> had bookmarked.
>
> On 21 February 2014 18:14, Fred Youhanaie <> wrote:
> > A shorter alternative, though only by just one step, is to use
> > erl_parse:parse_term(T) instead of parse_exprs and erl_eval:exprs.
> >
> > So the steps after the "erl -mylist [1,2,3]." command is
> > (note the dot at the end of the argument)
> >
> > {ok, [[Arg]]} = init:get_argument(mylist).
> > {ok, Tokens, _} = erl_scan:string(Arg).
> > {ok, List} = erl_parse:parse_term(Tokens).
> >
> > See example in http://www.erlang.org/faq/how_do_i.html#id53476
> >
> > Cheers
> > Fred
> >
> >
> >
> > On 21/02/14 14:41, Matthew Evans wrote:
> >>
> >> Not sure if there's another way...
> >> List = "[1,2,3,4]".
> >> {ok,T,_} = erl_scan:string(String++".").
> >> {ok,A} = erl_parse:parse_exprs(T).
> >> {value,Value,_} = erl_eval:exprs(A, erl_eval:new_bindings()).
> >> Value.[1,2,3,4]
> >>
> >>> Date: Fri, 21 Feb 2014 03:05:53 -0800
> >>> From: 
> >>> To: 
> >>> Subject: [erlang-questions] help me to read proper input from
> commandline
> >>> erl
> >>>
> >>> hi all,
> >>>
> >>>        while get runtime command prompt variable via
> >>> init:get_argument(name).
> >>>
> >>>
> >>>      i want to get a list . but in that " " are added while getting &
> >>> assign
> >>> to a varaible
> >>>
> >>>
> >>> % erl -mylist [1,2,3,4]
> >>>
> >>>> {ok,[[List|_]|_]} = init:get_argument(mylist).
> >>>
> >>> {ok,[["[1,2,3,4]"]]}
> >>>>
> >>>> List.
> >>>
> >>> "[1,2,3,4]"
> >>>
> >>>
> >>>
> >>> but expecting O/p as
> >>>
> >>>> List.
> >>>
> >>> [1,2,3,4]
> >>>
> >>>
> >>> please help , because of this double qutoes am not able to do Head &
> Tail
> >>> .
> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> View this message in context:
> >>>
> http://erlang.2086793.n4.nabble.com/help-me-to-read-proper-input-from-commandline-erl-tp4655367.html
> >>> Sent from the Erlang Questions mailing list archive at Nabble.com.
> >>> _______________________________________________
> >>> erlang-questions mailing list
> >>> 
> >>> http://erlang.org/mailman/listinfo/erlang-questions
> >>
> >>
> >>
> >>
> >>
> >> _______________________________________________
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> >> 
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> >>
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