[GRASS5] raster file history question

[Bob Covill]

Markus,

I think what you are talking about is writing to the History structure
of the raster. Only a few programs implement this. Most other programs
simply pick up the history from a previous raster.

As a code example you could look at i.rectify (exec.c). Here the History
structure is initialized and command parameters (and other useful info)
is written out.

What we need to do is identify the programs that would be most useful to
have the history written. 

Hope this helps.
 
Markus Neteler wrote:
> 
> On Thu, Apr 04, 2002 at 12:32:19PM +0200, Bernhard Reiter wrote:
> > On Wed, Apr 03, 2002 at 06:29:37PM +0200, Markus Neteler wrote:
> > > for a few modules I would like to add the feature that
> > > the invoking command lines is stored into the raster file history.
> > >
> > > It will be trivial, but I don't get the command line into
> > > a string.
> >
> > Maybe it is just me, but I don't understand the question.
> 
> Ok, sorry for boing unclear. A new try:
> 
> I want to store the command line, which was used to start a
> module, into the history section of data.
> 
> Example: I run
> 
> r.proj dgm1km loc=europa map=europa
> When I now run
> 
>  r.info dgm1km
> 
> the string "r.proj dgm1km loc=europa map=europa" should appear in
> the history. This is implemented in r.slope.aspect and s.surf.rst,
> but more complicated there. For my module (not r.proj) the command line
> string is sufficient to later remember the parameters which I used to
> generate that particular map.
> 
> It must be something with argv[] or so.
> 
> Thanks,
> 
>  Markus
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-- 
Bob Covill

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