From 0a9debf901a4b74be1f2f985e49238c63b353375 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=96mer=20Faruk=20Korkmaz?= <omer@upsonic.co>
Date: Mon, 19 Jan 2026 02:55:00 +0300
Subject: [PATCH] feat(#16): raise error when fuzzy detected

---
 src/msgcheck/po.py     | 41 +++++++++++++++++++++++++++++++++++------
 tests/test_msgcheck.py | 11 +++++++++--
 2 files changed, 44 insertions(+), 8 deletions(-)

diff --git a/src/msgcheck/po.py b/src/msgcheck/po.py
index 17752c4..9f97c63 100644
--- a/src/msgcheck/po.py
+++ b/src/msgcheck/po.py
@@ -352,6 +352,31 @@ def check_spelling(self, spelling: str, checkers: list[SpellChecker]) -> list[Po
                 )
         return errors
 
+    def check_fuzzy_string(self) -> list[PoReport]:
+        """Check if message is marked as fuzzy.
+
+        Return a list with errors detected.
+        """
+        if not self.fuzzy:
+            return []
+        errors: list[PoReport] = []
+        # Report fuzzy strings (skip header entries with empty msgid)
+        for mid, mstr in self.messages:
+            if mid:  # Skip header entries (empty msgid)
+                errors.append(
+                    PoReport(
+                        "fuzzy string found",
+                        "fuzzy",
+                        self.filename,
+                        self.line,
+                        mid,
+                        mstr,
+                        fuzzy=True,
+                    ),
+                )
+                break
+        return errors
+
 
 class Checker:
     """Messages checker."""
@@ -596,6 +621,8 @@ def check_msg(
                 if mid and mstr:
                     reports.append(PoReport(mstr, "extract"))
         else:
+            if self.checks["fuzzy"]:
+                reports += msg.check_fuzzy_string()
             if self.checks["lines"]:
                 reports += msg.check_lines()
             if self.checks["punct"]:
@@ -629,7 +656,7 @@ def check_pofile(self, po_file: PoFile) -> list[PoReport]:
 
         return reports
 
-    def check_file(self, filename: str) -> PoFileReport :
+    def check_file(self, filename: str) -> PoFileReport:
         """Check compilation and translations in a PO file."""
         po_file = PoFile(filename)
         report = PoFileReport(po_file.filename)
@@ -660,11 +687,13 @@ def check_files(self, files: list[str]) -> list[PoFileReport]:
         for path in files:
             if Path(path).is_dir():
                 for root, _, filenames in os.walk(path):
-                    result.extend([
-                        self.check_file(str(Path(root) / filename))
-                        for filename in filenames
-                        if filename.endswith(".po")
-                    ])
+                    result.extend(
+                        [
+                            self.check_file(str(Path(root) / filename))
+                            for filename in filenames
+                            if filename.endswith(".po")
+                        ],
+                    )
             else:
                 result.append(self.check_file(path))
         return result
diff --git a/tests/test_msgcheck.py b/tests/test_msgcheck.py
index 361a2b8..4e64bf1 100644
--- a/tests/test_msgcheck.py
+++ b/tests/test_msgcheck.py
@@ -151,8 +151,15 @@ def test_checks_fuzzy() -> None:
     # be sure we have one file in result
     assert len(result) == 1
 
-    # the file has 11 errors (with the fuzzy string)
-    assert len(result[0]) == 10
+    # the file has 11 errors (10 regular + 1 fuzzy string error)
+    assert len(result[0]) == 11
+
+    # verify that fuzzy string is reported as an error
+    fuzzy_errors = [report for report in result[0] if report.idmsg == "fuzzy"]
+    assert len(fuzzy_errors) == 1
+    assert fuzzy_errors[0].message == "fuzzy string found"
+    assert fuzzy_errors[0].fuzzy is True
+    assert fuzzy_errors[0].line == 58  # Line number of msgid (fuzzy comment is at line 57)
 
 
 def test_checks_noqa() -> None: