61 lines
1.4 KiB
Factor
61 lines
1.4 KiB
Factor
USING: sequences kernel namespaces make splitting
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math math.order fry assocs accessors ;
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IN: wrap
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! Word wrapping/line breaking -- not Unicode-aware
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TUPLE: word key width break? ;
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C: <word> word
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<PRIVATE
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SYMBOL: width
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: break-here? ( column word -- ? )
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break?>> not [ width get > ] [ drop f ] if ;
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: find-optimal-break ( words -- n )
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[ 0 ] dip [ [ width>> + dup ] keep break-here? ] find drop nip ;
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: (wrap) ( words -- )
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dup find-optimal-break
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[ 1 max cut-slice [ , ] [ (wrap) ] bi* ] [ , ] if* ;
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: intersperse ( seq elt -- seq' )
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[ '[ _ , ] [ , ] interleave ] { } make ;
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: split-lines ( string -- words-lines )
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string-lines [
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" \t" split harvest
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[ dup length f <word> ] map
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" " 1 t <word> intersperse
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] map ;
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: join-words ( wrapped-lines -- lines )
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[
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[ break?>> ]
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[ trim-head-slice ]
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[ trim-tail-slice ] bi
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[ key>> ] map concat
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] map ;
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: join-lines ( strings -- string )
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"\n" join ;
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PRIVATE>
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: wrap ( words width -- lines )
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width [
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[ (wrap) ] { } make
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] with-variable ;
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: wrap-lines ( lines width -- newlines )
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[ split-lines ] dip '[ _ wrap join-words ] map concat ;
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: wrap-string ( string width -- newstring )
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wrap-lines join-lines ;
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: wrap-indented-string ( string width indent -- newstring )
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[ length - wrap-lines ] keep '[ _ prepend ] map join-lines ;
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