 : post-process ( paragraph -- array )
     lines>> [ [ contents>> ] lmap>array ] lmap>array ;
 
-: initialize ( line-max line-ideal elements -- elements paragraph )
+: initial-step ( line-max line-ideal elements -- elements paragraph )
     reverse unclip [ -rot ] dip 1paragraph 1array ;
 
 PRIVATE>
 
 : wrap ( elements line-max line-ideal -- array )
     rot [ 2drop { } ] [
-        initialize
+        initial-step
         [ wrap-step ] reduce
         min-cost
         post-process

TUPLE: paragraph line-max line-ideal lines head-width tail-cost ;
C: <paragraph> paragraph

TYPED: top-fits? ( paragraph: paragraph -- ? )
    [ head-width>> ]
    [ dup lines>> 1list? [ line-ideal>> ] [ line-max>> ] if ] bi <= ; inline

TYPED: fits? ( paragraph: paragraph -- ? )
    ! Make this not count spaces at end
    { [ lines>> car 1list? ] [ top-fits? ] } 1|| ; inline

TYPED: paragraph-cost ( paragraph: paragraph -- cost )
    dup lines>> 1list? [ drop 0 ] [
        [ [ head-width>> ] [ line-ideal>> ] bi - sq ]
        [ tail-cost>> ] bi +
    ] if ; inline

: min-cost ( paragraphs -- paragraph )
    [ paragraph-cost ] infimum-by ; inline

    } 2cleave <paragraph> ; inline

TYPED: add-element ( paragraph: paragraph element: element -- )
    [ '[ _ element-length + ] change-head-width ]
    [ '[ unswons _ swons swons ] change-lines ] bi drop ; inline

TYPED: wrap-step ( paragraphs: array element: element -- paragraphs )
    [ [ min-cost ] dip new-line ]
    [ dupd '[ _ add-element ] each ]
    2bi swap prefix { array } declare
    [ fits? ] filter ; inline

: 1paragraph ( line-max line-ideal element -- paragraph )
    [ 1list 1list ] [ black>> ] bi 0 <paragraph> ;
