1 files changed, 70 insertions, 0 deletions
diff --git a/utils/opt-viewer/opt-diff.py b/utils/opt-viewer/opt-diff.py
new file mode 100755
index 0000000000000..8c377860653e0
--- /dev/null
+++ b/utils/opt-viewer/opt-diff.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python2.7
+
+from __future__ import print_function
+
+desc = '''Generate the difference of two YAML files into a new YAML file (works on
+pair of directories too).  A new attribute 'Added' is set to True or False
+depending whether the entry is added or removed from the first input to the
+next.
+
+The tools requires PyYAML.'''
+
+import yaml
+# Try to use the C parser.
+try:
+    from yaml import CLoader as Loader
+except ImportError:
+    from yaml import Loader
+
+import optrecord
+import argparse
+from collections import defaultdict
+from multiprocessing import cpu_count, Pool
+import os, os.path
+import fnmatch
+
+def find_files(dir_or_file):
+    if os.path.isfile(dir_or_file):
+        return [dir_or_file]
+
+    all = []
+    for dir, subdirs, files in os.walk(dir_or_file):
+        for file in files:
+            if fnmatch.fnmatch(file, "*.opt.yaml"):
+                all.append( os.path.join(dir, file))
+    return all
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description=desc)
+    parser.add_argument('yaml_dir_or_file_1')
+    parser.add_argument('yaml_dir_or_file_2')
+    parser.add_argument(
+        '--jobs',
+        '-j',
+        default=cpu_count(),
+        type=int,
+        help='Max job count (defaults to current CPU count)')
+    parser.add_argument('--output', '-o', default='diff.opt.yaml')
+    args = parser.parse_args()
+
+    if args.jobs == 1:
+        pmap = map
+    else:
+        pool = Pool(processes=args.jobs)
+        pmap = pool.map
+
+    files1 = find_files(args.yaml_dir_or_file_1)
+    files2 = find_files(args.yaml_dir_or_file_2)
+
+    all_remarks1, _, _ = optrecord.gather_results(pmap, files1)
+    all_remarks2, _, _ = optrecord.gather_results(pmap, files2)
+
+    added = set(all_remarks2.values()) - set(all_remarks1.values())
+    removed = set(all_remarks1.values()) - set(all_remarks2.values())
+
+    for r in added:
+        r.Added = True
+    for r in removed:
+        r.Added = False
+    stream = file(args.output, 'w')
+    yaml.dump_all(added | removed, stream)