[stringtemplate-interest] Bug in PyST: fails to look for templates in supergroup [patch]

[Roman Odaisky]

Greetings,

I failed to find the proper place to report bugs for the Python version of 
StringTemplate, so I’ll report it here.

PyST fails to look for templates in supergroups.

To reproduce:

mkdir -p /tmp/ST/sub
echo '$var:inner()$' >/tmp/ST/outer.st
echo 'it = $it$' >/tmp/ST/sub/inner.st

python <<E
from stringtemplate3 import StringTemplateGroup
stg_sub = StringTemplateGroup("brochure_common", "/tmp/ST/sub")
stg = StringTemplateGroup("brochure", "/tmp/ST", superGroup=stg_sub)
st = stg.getInstanceOf("outer")
st["var"] = "hello"
print str(st)  # or unicode(st)
E

I get an error message (why doesn’t PyST propagate the original exception?!).

Expected: “it = hello”.

To fix: grep for “eek”, agree with the comment, place “return None” instead 
of “raise”. Though it’s not a proper fix, because it would return None also 
in the (rare) case “br.close()” throws an exception.

StringTemplateGroup.lookupTemplate expects loadTemplateFromBeneathRootDir to 
return None in case the template file is not found, while the latter throws 
an exception instead.

-- 
WBR
Roman.
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