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Issue 1334 - let FOO_ST:FOO return empty when FOO_ST is empty/undefined

This commit is contained in:
Thomas Nagy 2013-07-08 19:37:42 +02:00
parent a1d35c0a69
commit d4d33bba2a
1 changed files with 15 additions and 7 deletions
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22
waflib/Task.py
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@ -337,14 +337,24 @@ class TaskBase(evil):
def colon(self, var1, var2):
"""
private function for the moment
Support code for scriptlet expressions such as ${FOO_ST:FOO}
If the first variable (FOO_ST) is empty, then an empty list is returned
used for scriptlet expressions such as ${FOO_ST:FOO}, for example, if
env.FOO_ST = ['-a', '-b']
env.FOO = ['1', '2']
then the result will be ['-a', '-b', '1', '-a', '-b', '2']
The results will be slightly different if FOO_ST is a list, for example::
env.FOO_ST = ['-a', '-b']
env.FOO_ST = '-I%s'
# ${FOO_ST:FOO} returns
['-Ip1', '-Ip2']
env.FOO = ['p1', 'p2']
# ${FOO_ST:FOO} returns
['-a', '-b', 'p1', '-a', '-b', 'p2']
"""
tmp = self.env[var1]
if not tmp:
return
if isinstance(var2, str):
it = self.env[var2]
else:
@ -352,8 +362,6 @@ class TaskBase(evil):
if isinstance(tmp, str):
return [tmp % x for x in it]
else:
if Logs.verbose and not tmp and it:
Logs.warn('Missing env variable %r for task %r (generator %r)' % (var1, self, self.generator))
lst = []
for y in it:
lst.extend(tmp)