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+% This macro source file is from the four volume series
+% "TeX in Practice" by Stephan von Bechtolsheim, published
+% 1993 by Springer-Verlag, New York.
+% Copyright 1993 Stephan von Bechtolsheim.
+% No warranty or liability is assumed.
+% This macro may be copied freely if no fees other than
+% media cost or shipping charges are charged and as long
+% as this copyright and the following source code itself
+% is not changed. Please see the series for further information.
+%
+% Version: 1.0
+% Date: May 1, 1993
+%
+%
+% This source code is documented in 27.1.9.1, p. III-417.
+% Original source in file "macros7.TEX", starting line 1022.
+\wlog{L: "ivpyr.tip" ["macros7.TEX," l. 1022, p. III-417]}%
+% This file DOES belong to format "texip."
+\InputD{futlet.tip}
+\InputD{list-mac.tip}
+\InputD{wtolist.tip}
+\catcode`\@ = 11
+\newdimen\@MaximumCurrentLineWidth
+\newdimen\@LineWidthLastLine
+\newdimen\@LineWidthMinDiff
+\newbox\@IPCurrentLineBox
+\newbox\@IPCurrentLineBoxTry
+\def\InvertedPyramid #1#2#3{%
+ \WordsToTeXList{\IVList}#3\EndWordsToTeXList
+ \def\LineLengthList{#1}%
+ \@LineWidthLastLine = 0pt
+ \@LineWidthMinDiff = #2
+ \CarOfList{\IVList}{\@IVListTemp}
+ \DropFirstElementOfList{\IVList}
+ \setbox\@IPCurrentLineBox = \hbox{\@IVListTemp}%
+ \CarOfList{\LineLengthList}{\@IVListTemp}%
+ \@MaximumCurrentLineWidth = \@IVListTemp
+ \DropFirstElementOfList{\LineLengthList}%
+ \ForEveryListElement{\IVList}{\@IVListTypeset}%
+ \ifvoid\@IPCurrentLineBox
+ \errmessage{\string\InvertedPyramid:
+ empty \string\@IPCurrentLineBox}%
+ \else
+ \centerline{\box\@IPCurrentLineBox}%
+ \fi
+}
+\def\@IVListTypeset #1{%
+ \setbox\@IPCurrentLineBoxTry =
+ \hbox{\copy\@IPCurrentLineBox \space#1}%
+ \ifdim\wd\@IPCurrentLineBoxTry < \@MaximumCurrentLineWidth
+ \setbox\@IPCurrentLineBox = \box\@IPCurrentLineBoxTry
+ \else
+ \@LineWidthLastLine = \wd\@IPCurrentLineBox
+ \centerline{\box\@IPCurrentLineBox}%
+ \setbox\@IPCurrentLineBox = \hbox{#1}%
+ \CarOfList{\LineLengthList}{\@IVListTemp}%
+ \@MaximumCurrentLineWidth = \@IVListTemp
+ \DropFirstElementOfList{\LineLengthList}%
+ \dimen0 = \@LineWidthLastLine
+ \advance\dimen0 by -\@MaximumCurrentLineWidth
+ \ifdim\dimen0 < \@LineWidthMinDiff
+ \@MaximumCurrentLineWidth = \@LineWidthLastLine
+ \advance\@MaximumCurrentLineWidth by -\@LineWidthMinDiff
+ \fi
+ \fi
+}
+\catcode`\@ = 12