import re
import jinja2
import jinja2.meta
+import yaml
+
+
+def finalize_for_yaml(elem):
+ """Render Jinja2 output specifically for YAML files"""
+ # Jinaj2 by default converts None to 'None', we can't allow this
+ # we could convert to empty string '', or we can convert to null, aka ~
+ if elem is None:
+ return '~'
+ # convert data structures to inline YAML
+ # match builtin types because we shouldn't be trying to render complex types
+ if isinstance(elem, (dict, list)):
+ # remove newlines because we are injecting back into YAML
+ # use block style for single line
+ return yaml.safe_dump(elem, default_flow_style=True).replace('\n', '')
+ return elem
class TaskTemplate(object):
single_msg = ("Please specify template task argument:%s")
raise TypeError((len(real_missing) > 1 and multi_msg or single_msg)
% ", ".join(real_missing))
- return jinja2.Template(task_template).render(**kwargs)
+ return jinja2.Template(task_template, finalize=finalize_for_yaml).render(**kwargs)
def is_really_missing(mis, task_template):
# Removing variables that have default values from
# missing. Construction that won't be properly
# check is {% set x = x or 1}
- if re.search(mis.join(["{%\s*set\s+", "\s*=\s*", "[^\w]+"]),
+ if re.search(mis.join([r"{%\s*set\s+", "\s*=\s*", r"[^\w]+"]),
task_template):
return False
# Also check for a default filter which can show up as
# a missing variable
- if re.search(mis + "\s*\|\s*default\(", task_template):
+ if re.search(mis + r"\s*\|\s*default\(", task_template):
return False
return True