v0.0.1 first commit

app/dependencies.py

@@ -0,0 +1,53 @@
+import subprocess
+import sys
+from pathlib import Path
+
+
+class DependencyManager:
+    def __init__(self, requirements_path: Path) -> None:
+        self.requirements_path = requirements_path
+
+    @staticmethod
+    def _normalize_requirement_name(requirement_line: str) -> str:
+        line = requirement_line.split(";", 1)[0].strip()
+        for sep in ["==", ">=", "<=", "!=", "~=", ">", "<"]:
+            if sep in line:
+                line = line.split(sep, 1)[0].strip()
+                break
+        if "[" in line:
+            line = line.split("[", 1)[0].strip()
+        return line
+
+    def parse_requirements(self) -> list[str]:
+        if not self.requirements_path.exists():
+            return []
+
+        requirements: list[str] = []
+        for raw in self.requirements_path.read_text(encoding="utf-8").splitlines():
+            line = raw.strip()
+            if not line or line.startswith("#"):
+                continue
+            requirements.append(line)
+        return requirements
+
+    def _is_installed(self, requirement: str) -> bool:
+        package_name = self._normalize_requirement_name(requirement)
+        if not package_name:
+            return True
+
+        result = subprocess.run(
+            [sys.executable, "-m", "pip", "show", package_name],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+            check=False,
+        )
+        return result.returncode == 0
+
+    def install_missing(self) -> list[str]:
+        requirements = self.parse_requirements()
+        missing = [req for req in requirements if not self._is_installed(req)]
+
+        if missing:
+            subprocess.check_call([sys.executable, "-m", "pip", "install", *missing])
+
+        return missing