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'''
Utility fns.
'''
import os
import jlib
def clip( text, prefixes, suffixes=''):
'''
Returns <text> with prefix(s) and suffix(s) removed if present.
'''
if isinstance( prefixes, str):
prefixes = prefixes,
if isinstance( suffixes, str):
suffixes = suffixes,
while 1:
for prefix in prefixes:
if text.startswith( prefix):
text = text[ len( prefix):]
break
else:
break
while 1:
for suffix in suffixes:
if suffix and text.endswith( suffix):
text = text[ :-len( suffix)]
break
else:
break
return text
def update_file_regress( text, filename, check_regression):
'''
Behaves like jlib.fs_update(), but if check_regression is true and
<filename> already exists with different content from <text>, we show a
diff and return an exception.
'''
text_old = jlib.fs_update( text, filename, check_regression)
if check_regression:
if text_old is not None:
# Existing content differs and <check_regression> is true.
with open( f'{filename}-2', 'w') as f:
f.write( text)
message = f'File would have changed: {os.path.relpath(filename)}'
jlib.log( message)
jlib.system( f'diff -u {filename} {filename}-2', verbose=True, raise_errors=False, prefix=f'diff {os.path.relpath(filename)}: ', out='log')
return Exception( message)
return text_old
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