Initial upload: git-insights-cli with CI/CD workflow

src/analyzers/code_churn.py

@@ -0,0 +1,57 @@
+from collections import defaultdict
+from dataclasses import dataclass
+from typing import Any, Dict, List, Optional
+
+from src.analyzers.git_repository import GitRepository
+from src.models.data_structures import CodeChurnAnalysis, Commit
+
+
+@dataclass
+class CodeChurnAnalyzer:
+    """Analyzes code churn."""
+
+    repo: GitRepository
+    days: int
+
+    def analyze(self) -> Optional[CodeChurnAnalysis]:
+        """Analyze code churn."""
+        commits = self.repo.get_commits()
+
+        if not commits:
+            return None
+
+        total_lines_added = sum(c.lines_added for c in commits)
+        total_lines_deleted = sum(c.lines_deleted for c in commits)
+        net_change = total_lines_added - total_lines_deleted
+
+        churn_by_file: Dict[str, Dict[str, int]] = defaultdict(lambda: {"added": 0, "deleted": 0})
+        churn_by_author: Dict[str, Dict[str, int]] = defaultdict(lambda: {"added": 0, "deleted": 0})
+
+        high_churn_commits = []
+        churn_threshold = 500
+
+        for commit in commits:
+            for filepath in commit.files_changed:
+                churn_by_file[filepath]["added"] += commit.lines_added
+                churn_by_file[filepath]["deleted"] += commit.lines_deleted
+
+            churn_by_author[commit.author]["added"] += commit.lines_added
+            churn_by_author[commit.author]["deleted"] += commit.lines_deleted
+
+            if commit.lines_added + commit.lines_deleted > churn_threshold:
+                high_churn_commits.append(commit)
+
+        high_churn_commits.sort(key=lambda c: c.lines_added + c.lines_deleted, reverse=True)
+
+        total_changes = sum(c.lines_added + c.lines_deleted for c in commits)
+        avg_churn_per_commit = total_changes / max(1, len(commits))
+
+        return CodeChurnAnalysis(
+            total_lines_added=total_lines_added,
+            total_lines_deleted=total_lines_deleted,
+            net_change=net_change,
+            churn_by_file=dict(churn_by_file),
+            churn_by_author=dict(churn_by_author),
+            high_churn_commits=high_churn_commits[:50],
+            average_churn_per_commit=avg_churn_per_commit,
+        )