[Tile-serving] [osm2pgsql] Delete undesired tags with Lua transform (#268)

[Paul Norman]

The C tag transform can drop tags like created_by, odbl, note, source, tiger:* and others specified in the style file. The sample Lua transform, style.lua, should do the same.

The following Lua might be helpful

```lua
delete_tags = {'INT-*', 'note', 'note:*', 'source', 'source_ref', 'source:*',
               'attribution', 'comment', 'fixme', 'created_by', 'odbl',
               'odbl:note', 'SK53_bulk:load', 'tiger:*', 'NHD:*', 'nhd:*',
               'gnis:*', 'geobase:*', 'accuracy:meters', 'sub_sea:type',
               'waterway:type', 'KSJ2:*', 'yh:*', 'osak:*', 'kms:*', 'ngbe:*',
               'naptan:*', 'CLC:*', '3dshapes:ggmodelk', 'AND_nosr_r',
               'import', 'it:fvg:*'}
function preprocess_tags (kv)
  tags = {}
  for k, v in pairs (kv) do
    match = false
    for _, d in ipairs(delete_tags) do
      match = match or string.find(k, d)
    end
    if not match then
      tags[k] = v
    end
  end
end
```

It takes num tags * num deletes iterations through the loop, but does short-circuit the string.find call if it's already matched a delete.


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/268
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