Added merge PDF writer as alternative to Zipfile

src/documents/bulk_download.py

@@ -1,12 +1,30 @@
 import os
-from zipfile import ZipFile
 
 from documents.models import Document
+from documents.parsers import merge_pdfs
+
+
+class MergedPdfFile:
+    def __init__(self, output_file_path):
+        self._output_file_path = output_file_path
+        self._input_file_paths = []
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args):
+        merge_pdfs(self._input_file_paths, self._output_file_path)
+
+    def namelist(self):
+        return self._input_file_paths
+
+    def write(self, document_path, _):
+        self._input_file_paths.append(document_path)
 
 
 class BulkArchiveStrategy:
-    def __init__(self, zipf: ZipFile, follow_formatting: bool = False):
-        self.zipf = zipf
+    def __init__(self, writer, follow_formatting: bool = False):
+        self.writer = writer
         if follow_formatting:
             self.make_unique_filename = self._formatted_filepath
         else:
@@ -27,7 +45,7 @@ class BulkArchiveStrategy:
         counter = 0
         while True:
             filename = folder + doc.get_public_filename(archive, counter)
-            if filename in self.zipf.namelist():
+            if filename in self.writer.namelist():
                 counter += 1
             else:
                 return filename
@@ -57,29 +75,29 @@ class BulkArchiveStrategy:
 
 class OriginalsOnlyStrategy(BulkArchiveStrategy):
     def add_document(self, doc: Document):
-        self.zipf.write(doc.source_path, self.make_unique_filename(doc))
+        self.writer.write(doc.source_path, self.make_unique_filename(doc))
 
 
 class ArchiveOnlyStrategy(BulkArchiveStrategy):
     def add_document(self, doc: Document):
         if doc.has_archive_version:
-            self.zipf.write(
+            self.writer.write(
                 doc.archive_path,
                 self.make_unique_filename(doc, archive=True),
             )
         else:
-            self.zipf.write(doc.source_path, self.make_unique_filename(doc))
+            self.writer.write(doc.source_path, self.make_unique_filename(doc))
 
 
 class OriginalAndArchiveStrategy(BulkArchiveStrategy):
     def add_document(self, doc: Document):
         if doc.has_archive_version:
-            self.zipf.write(
+            self.writer.write(
                 doc.archive_path,
                 self.make_unique_filename(doc, archive=True, folder="archive/"),
             )
 
-        self.zipf.write(
+        self.writer.write(
             doc.source_path,
             self.make_unique_filename(doc, folder="originals/"),
         )