Replace mbtiles2pmtiles with generic pmtiles-convert script

python/bin/pmtiles-convert

@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+
+#pmtiles to files
+#pmtiles to mbtiles
+#mbtiles to pmtiles
+
+import argparse
+import sqlite3
+from pmtiles.writer import write
+
+parser = argparse.ArgumentParser(description='Convert between PMTiles and other archive formats.')
+parser.add_argument('input',help='Input .mbtiles or .pmtiles')
+parser.add_argument('output',help='Output .mbtiles, .pmtiles, or directory')
+parser.add_argument('--maxzoom', help='the maximum zoom level to include in the output.')
+args = parser.parse_args()
+
+if args.input.endswith('.mbtiles') and args.output.endswith('.pmtiles'):
+    conn = sqlite3.connect(args.input)
+    cursor = conn.cursor()
+
+    with write(args.output) as writer:
+        for row in cursor.execute('SELECT zoom_level,tile_column,tile_row,tile_data FROM tiles WHERE zoom_level <= ? ORDER BY zoom_level,tile_column,tile_row ASC',(args.maxzoom or 99,)):
+            writer.write_tile(row[0],row[1],row[2],row[3])
+
+        metadata = {}
+        for row in cursor.execute('SELECT name,value FROM metadata'):
+            metadata[row[0]] = row[1]
+        if args.maxzoom:
+            metadata['maxzoom'] = str(args.maxzoom)
+        result = writer.finalize(metadata)
+        print("Num tiles:",result['num_tiles'])
+        print("Num unique tiles:",result['num_unique_tiles'])
+        print("Num leaves:",result['num_leaves'])
+
+    conn.close()
+elif args.input.endswith('.pmtiles') and args.output.endswith('.mbtiles'):
+    print("PMTiles to MBTiles not yet implemented")
+elif args.input.endswith(".pmtiles"):
+    print("PMTiles to directory not yet implemented")
+else:
+    print("Conversion not implemented")