Fix CSV export crash on filenames with embedded newlines

Use QUOTE_ALL + sanitise NUL/CR/LF in path/filename/exif fields. Default
csv dialect rejected fields containing line terminators with 'need to
escape, but no escapechar set'.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

app/main.py

@@ -689,17 +689,27 @@ def export_csv():
     con.close()
 
     output = io.StringIO()
-    writer = csv.writer(output)
+    # QUOTE_ALL + explicit lineterminator handles paths/filenames containing
+    # embedded \r, \n, quotes, or NULs — which the default dialect refuses.
+    writer = csv.writer(output, quoting=csv.QUOTE_ALL, lineterminator="\n")
     writer.writerow([
         "group_id", "method", "file_id", "path", "filename",
         "size", "width", "height", "exif_date", "device",
         "is_keeper", "is_redundant", "reviewed",
     ])
+
+    def _clean(v):
+        # Strip NULs (csv writer rejects them) and normalise embedded line breaks
+        if isinstance(v, str):
+            return v.replace("\x00", "").replace("\r\n", " ").replace("\r", " ").replace("\n", " ")
+        return v
+
     for r in rows:
         writer.writerow([
             r["group_id"], r["method"], r["file_id"],
-            r["path"], r["filename"], r["file_size"],
-            r["width"], r["height"], r["exif_datetime"], r["exif_device"],
+            _clean(r["path"]), _clean(r["filename"]), r["file_size"],
+            r["width"], r["height"], _clean(r["exif_datetime"]),
+            _clean(r["exif_device"]),
             r["is_keeper"], r["is_redundant"], r["reviewed"],
         ])
 

debian/build-deb.sh

@@ -13,7 +13,7 @@ BUILD_DIR="$REPO_ROOT/build/deb"
 
 # ── Config ────────────────────────────────────────────────────────────────────
 PKG_NAME="dupfinder"
-PKG_VERSION="1.0.3"
+PKG_VERSION="1.0.4"
 PKG_ARCH="amd64"
 DEB_FILE="${PKG_NAME}_${PKG_VERSION}_${PKG_ARCH}.deb"