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"""
:copyleft: 2020 by python-creole team, see AUTHORS for more details.
:license: GNU GPL v3 or above, see LICENSE for more details.
"""
import difflib
def unified_diff(old, new, filename=None):
"""
Return text of unified diff between old and new.
"""
if filename is None:
fromfile = 'old'
tofile = 'new'
else:
fromfile = f'old / {filename}'
tofile = f'new / {filename}'
if isinstance(old, str) and isinstance(new, str):
old = old.splitlines(keepends=True)
new = new.splitlines(keepends=True)
diff = difflib.unified_diff(old, new, fromfile=fromfile, tofile=tofile)
text = ''
for line in diff:
text += line
# Work around missing newline (http://bugs.python.org/issue2142).
if text and not line.endswith('\n'):
text += 'n\\ No newline at end of file\n'
return text
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