fix root dir writing, refactor js getZxy

python/bin/pmtiles-show

@@ -8,8 +8,14 @@ if len(sys.argv) <= 1:
     exit(1)
 
 with read(sys.argv[1]) as reader:
-    print('spec version: ',reader.version)
-    print('metadata:')
-    for k, v in reader.metadata.items():
-        print(k,'=',v)
-    print('root entries:', reader.root_entries)
+    if len(sys.argv) == 2:
+        print('spec version: ',reader.version)
+        print('metadata:')
+        for k, v in reader.metadata.items():
+            print(k,'=',v)
+        print('root entries:', reader.root_entries)
+    else:
+        z = int(sys.argv[2])
+        x = int(sys.argv[3])
+        y = int(sys.argv[4])
+        print(reader.get(z,x,y))

python/pmtiles/reader.py

@@ -47,6 +47,7 @@ class Reader:
     def root_entries(self):
         return int.from_bytes(self.mmap[8:10],byteorder='little')
 
+    # TODO support recursive directories
     def get(self,z,x,y):
         val = self.root_dir.get((z,x,y))
         if val:

python/pmtiles/writer.py

@@ -97,8 +97,8 @@ class Writer:
             if len(leafdir_tiles):
                 self.write_leafdir(leafdir_tiles)
 
-            root = [group for group in itertools.groupby(self.tiles,key=by_parent) if group[0][0] == 0][0]
-            root_tiles = list(root[1])
+            root = [(group[0],list(group[1])) for group in itertools.groupby(self.tiles,key=by_parent) if group[0][0] == 0][0]
+            root_tiles = root[1]
             self.f.seek(0)
             self.write_header(metadata,len(root_tiles) + len(self.leaves))
             for entry in root_tiles: