Added coveralls merge

tool/coveralls_merge.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+
+import json
+import os
+import sys
+
+def find_by_name(source_files_json, name):
+    for j in source_files_json:
+        if j['name'] == name:
+            return j
+
+    return None
+
+def merge_source_files(master, source):
+    for sf in source:
+        dest_sf = find_by_name(master, sf['name'])
+        if dest_sf is None:
+            master.append(sf)
+            continue
+
+        assert len(dest_sf['coverage']) == len(sf['coverage'])
+
+        for i, line in enumerate(sf['coverage']):
+            if line is None:
+                continue
+
+            if dest_sf['coverage'][i] is None:
+                dest_sf['coverage'][i] = 0
+
+
+            dest_sf['coverage'][i] += line
+
+def get_json_from_file(fpath):
+    with open(fpath, 'rb') as fp:
+        return json.load(fp)
+
+def main():
+    out = {}
+    out['source_files'] = []
+
+    sources = []
+
+    for f in sys.argv[1:]:
+        assert os.path.isfile(f)
+        sources.append(get_json_from_file(f))
+
+    for s in sources:
+        merge_source_files(out['source_files'], s['source_files'])
+
+    print(json.dumps(out))
+
+if __name__ == '__main__':
+    main()