Re: [naviserver-devel] ns_parseargs example

[Zoran V. <zv...@ar...>]

Am 28.05.2005 um 14:19 schrieb Stephen Deasey:

>
>
> ns_parseargs {{-eightbit flag} {-foo flag} args}
>
> How do you distinguish between -eightbit which is a boolean flag, and
> -foo which is an option with a default string value of 'flag'?

Here is how:

     ns_parseargs {=10=10{{-eightbit flag}} {-foo flag} args}

The first argument of the above spec is:

      {{-eightbit flag}}

which is a one-element list.

Generally you'd have:

     {{spec} {spec} {spec} args}

where "spec" is:

     {option value}

where option is:

     {-variable type ?type_specific_part?}

The "type_specific_part" whould be a choice-list for "oneof" type, =20
for example.
This is just a nested-list exercise. It is Tcl-natural and can become
difficult to write with all those curly braces, but that's the price
of the flexibility.

>
> I don't know that it makes much sense to supply a default for boolean
> flags.  In that case you probably want to invert the sense of the flag
> name: -nofoo.

There is no sense in supplying defaults for boolean flags, but the
syntax would/must allow it (i.e. special case).

Zoran