Add forward-compatibility with Pillow 8.0.0

Author: Hugo Osvaldo Barrera

barcode/base.py

@@ -80,10 +80,7 @@ def write(self, fp, options=None, text=None):
                 Text to render under the barcode.
         """
         output = self.render(options, text)
-        if hasattr(output, "tostring"):
-            output.save(fp, format=self.writer.format)
-        else:
-            fp.write(output)
+        self.writer.write(output, fp)
 
     def render(self, writer_options=None, text=None):
         """Renders the barcode using `self.writer`.

barcode/writer.py

@@ -1,6 +1,7 @@
 import gzip
 import os
 import xml.dom
+from typing.io import BinaryIO
 
 from barcode.version import version
 
@@ -318,6 +319,13 @@ def save(self, filename, output):
                 f.write(output)
         return _filename
 
+    def write(self, content, fp: BinaryIO):
+        """Write `content` into a file-like object.
+
+        Content should be a barcode rendered by this writer.
+        """
+        fp.write(content)
+
 
 if Image is None:
     ImageWriter = None
@@ -367,3 +375,10 @@ def save(self, filename, output):
             filename = "{}.{}".format(filename, self.format.lower())
             output.save(filename, self.format.upper())
             return filename
+
+        def write(self, content, fp: BinaryIO):
+            """Write `content` into a file-like object.
+
+            Content should be a barcode rendered by this writer.
+            """
+            content.save(fp, format=self.format)

tests/test_writers.py

@@ -0,0 +1,27 @@
+import os
+from io import BytesIO
+
+from barcode import EAN13
+from barcode.writer import ImageWriter
+from barcode.writer import SVGWriter
+
+
+PATH = os.path.dirname(os.path.abspath(__file__))
+TESTPATH = os.path.join(PATH, "test_outputs")
+
+if ImageWriter:
+
+    def test_saving_image_to_byteio():
+        rv = BytesIO()
+        EAN13(str(100000902922), writer=ImageWriter()).write(rv)
+
+        with open(f"{TESTPATH}/somefile.jpeg", "wb") as f:
+            EAN13("100000011111", writer=ImageWriter()).write(f)
+
+
+def test_saving_svg_to_byteio():
+    rv = BytesIO()
+    EAN13(str(100000902922), writer=SVGWriter()).write(rv)
+
+    with open(f"{TESTPATH}/somefile.svg", "wb") as f:
+        EAN13("100000011111", writer=SVGWriter()).write(f)