Add a tool for counting meshes (related to regression on issue #462 in other mods not yet fixed to help fix them).

pyenliven/objanalyze.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+'''
+Count the number of meshes in OBJ files. In the Wavefront OBJ format,
+these meshes are technically called "Objects" and the OBJ file can have
+any number of them. They are created by the "o" command in the file.
+
+Alternative (OBJ or non-OBJ):
+- For support of any file that can be imported into Blender, try pasting
+  count_objects.py's contents (found in
+  EnlivenMinetest/utilities/blender/) into a Blender script Window
+  (Follow instructions in docstring at top of file).
+'''
+from __future__ import print_function
+import sys
+import os
+
+
+def echo0(*args, **kwargs):
+    dst = sys.stderr
+    if 'file' in kwargs:
+        dst = kwargs['file']
+        del kwargs['file']
+    print(*args, file=dst, **kwargs)
+
+
+def usage():
+    echo0(__doc__)
+    echo0()
+
+
+def obj_stats(path):
+    results = {
+        'mesh_count': 0,
+    }
+    if not os.path.isfile(path):
+        raise FileNotFoundError(path)
+    lineN = 0
+    with open(path, 'rb') as stream:
+        for rawL in stream:
+            lineN += 1  # counting numbers start at 1
+            line = rawL.strip()
+            if not line.strip():
+                # blank line
+                continue
+            parts = line.split()
+            if parts[0] == b"o":
+                results['mesh_count'] += 1
+            else:
+                pass
+                # echo0('line {}: Does not start with "o": {}'
+                #       ''.format(lineN, parts))
+    return results
+
+
+def main():
+    if len(sys.argv) < 2:
+        usage()
+        echo0("You must provide an OBJ filename.")
+        return 1
+    path = sys.argv[1]
+    if not path.lower().endswith(".obj"):
+        usage()
+        echo0("Error: Only OBJ files can be analyzed. Try pasting"
+              " count_objects.py's contents into a Blender script window"
+              " (Follow instructions in docstring at top of file)")
+              " to analyze any file you can import into Blender."
+        return 1
+    if not os.path.isfile(path):
+        # Avoid an exception & use CLI-style (pipe & filter) logic
+        usage()
+        echo0('Error: "{}" does not exist.'.format(path))
+        return 1
+    stats = obj_stats(path)
+    print(stats['mesh_count'])
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())

utilities/blender/count_objects.py

@@ -13,6 +13,10 @@ Usage:
   the utilities/blender directory at
   github.com/poikilos/EnlivenMinetest).
 - "Text", "Run Script".
+
+Alternatives:
+OBJ files can be analyzed in the terminal with a terminal Python script:
+objanalyze <file>
 '''
 import bpy
 

utilities/objanalyze

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+'''
+Count the number of meshes in OBJ files. In the Wavefront OBJ format,
+these meshes are technically called "Objects" and the OBJ file can have
+any number of them. They are created by the "o" command in the file.
+'''
+from __future__ import print_function
+import sys
+import os
+
+SCRIPTS_DIR = os.path.dirname(os.path.realpath(__file__))
+REPO_DIR = os.path.dirname(SCRIPTS_DIR)
+
+sys.path.insert(0, REPO_DIR)  # let import find pyenliven when it's not installed
+
+from pyenliven.objanalyze import main
+
+if __name__ == "__main__":
+    sys.exit(main())