Merge pull request #167 from EmbroidePy/silent-pass

Throw errors on file read/write if errors occur

README.md

@@ -221,6 +221,8 @@ The Gcode is intended for a number of hobbyist projects that use a gcode control
 #### Reading from HUS:
 The HUS format requires an obscure and defunct form of compression. The EmbCompress performs this decompression. It is written from the ground up in pure python. It does not require any compiled element or dll file. It has no obfuscation and is intended to be easily understood.
 
+### IO
+Starting in version 1.5.0, we no longer silently pass errors. Explicit IOErrors are raised if the writer is not supported, does not exist, or reading a file that does not exist.
 
 ### Reading
 

pyembroidery/EmbPattern.py

@@ -1479,19 +1479,11 @@ def read_embroidery(reader, f, settings=None, pattern=None):
             except AttributeError:
                 pass
             if text_mode:
-                try:
-                    with open(f, "r") as stream:
-                        reader.read(stream, pattern, settings)
-                        stream.close()
-                except IOError:
-                    pass
+                with open(f, "r") as stream:
+                    reader.read(stream, pattern, settings)
             else:
-                try:
-                    with open(f, "rb") as stream:
-                        reader.read(stream, pattern, settings)
-                        stream.close()
-                except IOError:
-                    pass
+                with open(f, "rb") as stream:
+                    reader.read(stream, pattern, settings)
         else:
             reader.read(f, pattern, settings)
         return pattern
@@ -1646,17 +1638,11 @@ def write_embroidery(writer, pattern, stream, settings=None):
             except AttributeError:
                 pass
             if text_mode:
-                try:
-                    with open(stream, "w") as stream:
-                        writer.write(pattern, stream, settings)
-                except IOError:
-                    pass
+                with open(stream, "w") as stream:
+                    writer.write(pattern, stream, settings)
             else:
-                try:
-                    with open(stream, "wb") as stream:
-                        writer.write(pattern, stream, settings)
-                except IOError:
-                    pass
+                with open(stream, "wb") as stream:
+                    writer.write(pattern, stream, settings)
         else:
             writer.write(pattern, stream, settings)
 
@@ -1743,16 +1729,15 @@ def static_write(pattern, filename, settings=None):
         supported_extensions = [file_type["extension"] for file_type in EmbPattern.supported_formats()]
 
         if extension not in supported_extensions:
-            raise Exception(f"Conversion to file type '{extension}' is not supported")
+            raise IOError("Conversion to file type '{extension}' is not supported".format(extension=extension))
 
         ext_to_file_type_lookup = {file_type["extension"]: file_type for file_type in EmbPattern.supported_formats()}
         writer = ext_to_file_type_lookup[extension].get("writer")
 
         if writer:
             EmbPattern.write_embroidery(writer, pattern, filename, settings)
         else:
-            # TODO: I don't think we should pass silently!
-            pass
+            raise IOError("No supported writer found.")
 
     @staticmethod
     def is_str(obj):

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="pyembroidery",
-    version="1.4.38",
+    version="1.5.0",
     author="Tatarize",
     author_email="tatarize@gmail.com",
     description="Embroidery IO library",

test/test_io.py

@@ -0,0 +1,31 @@
+import unittest
+
+from test.pattern_for_tests import *
+
+
+class TestExplicitIOErrors(unittest.TestCase):
+    def test_read_non_file(self):
+        """
+        1.5.0 adds explicit error raising.
+        We test that now.
+        """
+        file1 = "nosuchfile.dst"
+        self.assertRaises(IOError, lambda: EmbPattern(file1))
+
+    def test_write_non_supported(self):
+        """
+        1.5.0 adds explicit error raising.
+        We test that now.
+        """
+        pattern = get_simple_pattern()
+        file1 = "nosuchfile.pdf"
+        self.assertRaises(IOError, lambda: pattern.write(file1))
+
+    def test_write_no_writer(self):
+        """
+        1.5.0 adds explicit error raising.
+        We test that now.
+        """
+        pattern = get_simple_pattern()
+        file1 = "nosuchfile.dat"
+        self.assertRaises(IOError, lambda: pattern.write(file1))