[Test] move test rot13 plugin into git tree

from 0dc912af82

tests/external_plugins_src/README.md

@@ -0,0 +1,9 @@
+# Rot13 Custom Exporter for Jrnl
+
+This is a custom exporter to demostrate how to write customer exporters for
+[jrnl](https://github.com/jrnl-org/jrnl). It is also used by *jrnl* in its
+tests to ensure the feature works as expected.
+
+This plugin applies a [Caeser
+cipher](https://en.wikipedia.org/wiki/Caesar_cipher) (specifically the
+[ROT13](https://en.wikipedia.org/wiki/ROT13)) to output text.

tests/external_plugins_src/jrnl/contrib/exporter/rot13.py

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+import codecs
+
+from jrnl.plugins.base import BaseExporter
+
+__version__ = "1.0.0"
+
+class Exporter(BaseExporter):
+    names = ["rot13"]
+    extension = "txt"
+    version = __version__
+
+    @classmethod
+    def export_entry(cls, entry):
+        return codecs.encode(str(entry), "rot_13")

tests/external_plugins_src/setup.py

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+import os
+import re
+
+try:
+    from setuptools import setup
+except ImportError:
+    from distutils.core import setup
+
+base_dir = os.path.dirname(os.path.abspath(__file__))
+
+
+def get_version(filename="jrnl/contrib/exporter/rot13.py"):
+    with open(os.path.join(base_dir, filename), encoding="utf-8") as initfile:
+        for line in initfile.readlines():
+            m = re.match("__version__ *= *['\"](.*)['\"]", line)
+            if m:
+                return m.group(1)
+
+
+setup(
+    name="jrnl-demo-plugins",
+    version=get_version(),
+    description="Demonstration custom plugins for jrnl",
+    long_description="\n\n".join([open(os.path.join(base_dir, "README.md")).read()]),
+    long_description_content_type="text/markdown",
+    author="W. Minchin",
+    author_email="w_minchin@hotmail.com",
+    url="https://github.com/jrnl-org/jrnl/tree/develop/tests/external_plugins_src",
+    packages=["jrnl", "jrnl.contrib", "jrnl.contrib.exporter", "jrnl.contrib.importer"],
+    include_package_data=True,
+    install_requires=[
+        "jrnl",
+    ],
+    zip_safe=False,  # use wheels instead
+)