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#!/usr/bin/env python3
"""
Pandoc filter to allow interpolation of metadata fields
into a document. %{fields} will be replaced by the field's
value, assuming it is of the type MetaInlines or MetaString.
"""
from pandocfilters import toJSONFilter, attributes, Span, Str
import re
pattern = re.compile('%\{(.*)\}$')
def metavars(key, value, format, meta):
if key == 'Str':
m = pattern.match(value)
if m:
field = m.group(1)
result = meta.get(field, {})
if 'MetaInlines' in result['t']:
return Span(attributes({'class': 'interpolated',
'field': field}),
result['c'])
elif 'MetaString' in result['t']:
return Str(result['c'])
if __name__ == "__main__":
toJSONFilter(metavars)
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