strings:indent_lines/4

SWI-Prolog Did You Know Did you know? about nifty JoCaml style multithreading

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Predicate indent_lines/4

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swipl
- library

indent_lines(:Filter, +Prefix, +In, -Out) is det: Similar to indent_lines/3, but only adds Prefix to lines for which call(Filter, Line) succeeds.