Hi Gerd
the evaluation of boolean options in mkgmap is a bit confusing. It is possible to specify e.g. --drive-on-left
This is the only documented form for this option.
--drive-on-left=true or --drive-on-left=false or --drive-on-left=any-value
These are all incorrect, I guess you could error out if it is causing confusion. The correct way to reverse a boolean is to prefix with "no-" eg: --no-tdbfile. But in this particular case it isn't even meaningful - what should you do with --drive-on-right=false or --no-drive-on-right; use the default? Which is drive-on-right ;) I suppose --drive-on=left|right would have been easier in this case.
In the current code both all have the same effect, because the evaluation is done like this: driveOnLeft = props.getProperty("drive-on-left") != null;
On the other hand, --keep-going and --keep-going=false do not have the same effect, and that is true for most boolean options, because typically we use this kind of evaluation: linkPOIsToWays = props.getProperty("link-pois-to-ways", false);
Oh well, perhaps everyone disagrees with me then :) I guess all those options were added before the "no-" prefix was available however. ..Steve