add plaintext ifmt

Author: mr-mixas

nested_diff/cli.py

@@ -27,7 +27,14 @@ class App:
     default_ifmt = 'auto'
     default_ofmt = 'auto'
 
-    supported_ifmts = ('auto', 'ini', 'json', 'toml', 'yaml')
+    supported_ifmts = (
+        'auto',
+        'ini',
+        'json',
+        'plaintext',
+        'toml',
+        'yaml',
+    )
     supported_ofmts = ('auto', 'ini', 'json', 'toml', 'yaml')
 
     version = nested_diff.__version__
@@ -186,6 +193,8 @@ def get_loader(fmt, **kwargs):
             return IniLoader(**kwargs)
         if fmt == 'toml':
             return TomlLoader(**kwargs)
+        if fmt == 'plaintext':
+            return Loader(**kwargs)
 
         raise RuntimeError(f'Unsupported input format: {fmt}')
 
@@ -290,11 +299,11 @@ def decode(self, data):  # noqa U100
         Args:
             data: Data to decode.
 
-        Raises:
-            NotImplementedError: Must be implemented in derivatives.
+        Returns:
+            Decoded data structure.
 
         """
-        raise NotImplementedError
+        return data
 
     @staticmethod
     def get_opts(opts):

nested_diff/diff_tool.py

@@ -211,6 +211,9 @@ def get_dumper(self, fmt, **kwargs):
             fmt = 'term' if self.args.out.isatty() else 'text'
 
         if fmt in FormatterDumper.supported_fmts:
+            if self.args.ifmt == 'plaintext':
+                kwargs.setdefault('type_hints', False)
+
             return FormatterDumper(fmt=fmt, values=self.args.values, **kwargs)
 
         return super().get_dumper(fmt, **kwargs)

tests/cli/test_cli.py

@@ -15,8 +15,7 @@ def test_abstract_dumper_encode():
 
 
 def test_abstract_loader_decode():
-    with pytest.raises(NotImplementedError):
-        cli.Loader().decode('data')
+    assert cli.Loader().decode('data') == 'data'
 
 
 def test_dumper_dump_default_with_tty(stringio_tty):

tests/cli/test_diff_tool.py

@@ -284,6 +284,23 @@ def test_html_ofmt_wrappings(capsys, expected, rpath):
     assert captured.out == expected
 
 
+def test_plaintext_ifmt(capsys, expected, rpath):
+    exit_code = nested_diff.diff_tool.App(
+        args=(
+            rpath('shared.lists.a.json'),
+            rpath('shared.lists.b.json'),
+            '--ifmt',
+            'plaintext',
+        ),
+    ).run()
+
+    captured = capsys.readouterr()
+    assert captured.err == ''
+    assert exit_code == 1
+
+    assert captured.out == expected
+
+
 def test_text_ofmt(capsys, expected, rpath):
     exit_code = nested_diff.diff_tool.App(
         args=(

tests/cli/test_diff_tool.test_plaintext_ifmt.exp

@@ -0,0 +1,10 @@
+  @@ -1,7 +1,8 @@
+  [
+     0,
+     [
+-       1
++       1,
++       2
+     ],
+     3
+  ]