add --osmfilter option

src/pfaedle/osm/OsmBuilder.cpp

@@ -183,6 +183,50 @@ void OsmBuilder::read(const std::string& path, const OsmReadOpts& opts,
   LOG(DEBUG) << _lines.size() << " transit lines have been read.";
 }
 
+// _____________________________________________________________________________
+void OsmBuilder::osmfilterRuleWrite(std::ostream* out,
+                                  const std::vector<OsmReadOpts>& opts,
+                                  const BBoxIdx& latLngBox) const {
+  UNUSED(latLngBox);
+  OsmIdSet bboxNodes, noHupNodes;
+  MultAttrMap emptyF;
+
+  RelLst rels;
+  OsmIdList ways;
+  RelMap nodeRels, wayRels;
+
+  NIdMap nodes;
+
+  OsmFilter filter;
+
+  AttrKeySet attrKeys[3] = {};
+
+  for (const OsmReadOpts& o : opts) {
+    filter = filter.merge(OsmFilter(o.keepFilter, o.dropFilter));
+    getKeptAttrKeys(o, attrKeys);
+  }
+
+  *out << "--keep=\n";
+
+  for (auto r : filter.getKeepRules()) {
+    for (auto val : r.second) {
+      *out << r.first << "=";
+      if (val.first != "*") *out << val.first;
+      *out << "\n";
+    }
+  }
+
+  *out << "\n";
+
+  *out << "--keep-tags=\n";
+
+  for (const auto& keys : attrKeys) {
+    for (auto val : keys) {
+      *out << val << "=\n";
+    }
+  }
+}
+
 // _____________________________________________________________________________
 void OsmBuilder::overpassQryWrite(std::ostream* out,
                                   const std::vector<OsmReadOpts>& opts,

src/pfaedle/osm/OsmBuilder.h

@@ -92,6 +92,12 @@ class OsmBuilder {
   void overpassQryWrite(std::ostream* out, const std::vector<OsmReadOpts>& opts,
                         const BBoxIdx& latLngBox) const;
 
+  // Based on the list of options, output an osmfilter configuration file
+  // to filter the data needed for routing
+  void osmfilterRuleWrite(std::ostream* out,
+                          const std::vector<OsmReadOpts>& opts,
+                          const BBoxIdx& latLngBox) const;
+
   // Based on the list of options, read an OSM file from in and output an
   // OSM file to out which contains exactly the entities that are needed
   // from the file at in