wxGUI: don't allow for negative column number

[msieczka]

A command that requires a data table column number input, should not allow to enter a negative value. For example, in v.in.ascii one shouldn't be able to enter or select with the spin box e.g. z=-32 cat=-8.

[martinl]

The attached patch allows to define ranges:

1- -> <1; undef)
-1- -> <-1; undef)
-1 -> (undef, 1>
--1 -> (undef, -1>

[martinl]

parse undef;min/max ranges

[martinl]

...any comments or objections to committing the patch?

[hamish]

the syntax is still a bit complicated / vague / tricky to me, e.g. how to set int_opt=-1 when you want to set just -1.0?

is the patch to help the programmer set opt_xcol->options = ">=1"; ? if so, why not add some magic code to parse <>= instead of a new & unintuitive "--1" "-1-" syntax? (ie not to say it is broken, just that it fails the transferable knowledge test badly)

for v.in.ascii, column >=0 checks added in r34608, r34609.

At this stage, we should not make new non-critical changes to lib/gis/parser.c in devbr6 IMHO. As the specific reported issue of v.in.ascii is fixed, changing bug's target to g7.

I leave GUI spinbox controls to others, but guess that it is dependent on parser support for ->options as above.

Hamish