Mercurial > public > mercurial-scm > hg-stable
comparison mercurial/util.py @ 11988:8380ed691df8
util: add an interpolate() function to for replacing multiple values
util.interpolate can be used to replace multiple items in a string all at once
(and optionally apply a function to the replacement), without worrying about
recursing:
>>> import util
>>> s = '$foo, $spam'
>>> util.interpolate(r'\$', { 'foo': 'bar', 'spam': 'eggs' }, s)
'bar, eggs'
>>> util.interpolate(r'\$', { 'foo': 'spam', 'spam': 'foo' }, s)
'spam, foo'
>>> util.interpolate(r'\$', { 'foo': 'spam', 'spam': 'foo' }, s, lambda s: s.upper())
'SPAM, FOO'
The patch also changes filemerge.py to use this new function.
| author | Steve Losh <steve@stevelosh.com> |
|---|---|
| date | Wed, 18 Aug 2010 18:18:26 -0400 |
| parents | 851161f07068 |
| children | ad787252fed6 |
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| 11985:81edef14922e | 11988:8380ed691df8 |
|---|---|
| 1406 try: | 1406 try: |
| 1407 return int(os.environ['COLUMNS']) | 1407 return int(os.environ['COLUMNS']) |
| 1408 except ValueError: | 1408 except ValueError: |
| 1409 pass | 1409 pass |
| 1410 return termwidth_() | 1410 return termwidth_() |
| 1411 | |
| 1412 def interpolate(prefix, mapping, s, fn=None): | |
| 1413 """Return the result of interpolating items in the mapping into string s. | |
| 1414 | |
| 1415 prefix is a single character string, or a two character string with | |
| 1416 a backslash as the first character if the prefix needs to be escaped in | |
| 1417 a regular expression. | |
| 1418 | |
| 1419 fn is an optional function that will be applied to the replacement text | |
| 1420 just before replacement. | |
| 1421 """ | |
| 1422 fn = fn or (lambda s: s) | |
| 1423 r = re.compile(r'%s(%s)' % (prefix, '|'.join(mapping.keys()))) | |
| 1424 return r.sub(lambda x: fn(mapping[x.group()[1:]]), s) | |
| 1425 |