chore: added new version of engine

Author: n0rfas

.gitignore

@@ -8,4 +8,8 @@ htmlcov/
 build/
 dist/
 poetry.lock
-coverage.xml
+coverage.xml
+
+#tmp
+gen.py
+gen_data.py

git_analytics/metrics/bus_factor.py

@@ -0,0 +1,20 @@
+from typing import Dict, Any
+
+
+class BusFactorMetric:
+    def __init__(self, data: Dict[str, Any]) -> None:
+        self.data = data["authors_statistics"]
+
+    def compute(self, threshold: float = 0.5) -> int:
+        authors_stats = {}
+        for author, item in self.data.items():
+            authors_stats[author] = item.get("insertions", 0) + item.get("deletions", 0)
+
+        total = sum(authors_stats.values())
+        acc = 0
+        for _, lines in sorted(authors_stats.items(), key=lambda x: x[1], reverse=True):
+            acc += lines
+            if acc / total >= threshold:
+                return len([a for a in authors_stats if authors_stats[a] >= lines])
+
+        return 777