Add detectors module

i18n_guardian/detectors/gettext.py

@@ -0,0 +1,48 @@
+"""Gettext detector."""
+
+from pathlib import Path
+from typing import Optional
+
+from i18n_guardian.detectors.base import Detector
+
+
+class GettextDetector(Detector):
+    """Detect Gettext library usage."""
+
+    @property
+    def name(self) -> str:
+        return "gettext"
+
+    @property
+    def patterns(self) -> list:
+        return ["*.po", "*.pot", "messages.po"]
+
+    def detect(self, path: Path) -> Optional[str]:
+        """Check for Gettext usage."""
+        for po_file in path.rglob("*.po"):
+            if po_file.exists():
+                return self.name
+
+        for pot_file in path.rglob("*.pot"):
+            if pot_file.exists():
+                return self.name
+
+        for py_file in path.rglob("*.py"):
+            try:
+                content = py_file.read_text(encoding="utf-8")
+                if "_(" in content and ("import gettext" in content or "import _" in content):
+                    return self.name
+            except OSError:
+                continue
+
+        return None
+
+    def get_i18n_functions(self) -> list:
+        """Get Gettext function names."""
+        return [
+            "_",
+            "gettext",
+            "ngettext",
+            "pgettext",
+            "npgettext",
+        ]