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% Outliner.sty version 0.94 July 2002
% copyright Victor Eijkhout 2000/1/2
% file name: outliner.sty
%
% Purpose:
% provide an outline mode for LaTeX, where the user indicates
% only numerical level values; the definition of the levels in
% terms of section commands or itemize (or other) lists is done
% separately.
%
% Author
%   Victor Eijkhout
%   Department of Computer Science
%   University of Tennessee
%   107 Ayres Hall
%   Knoxville TN 37996
%   USA
%
%   victor@eijkhout.net
%
% This program is free software; you can redistribute it and/or
% modify it under the terms of the GNU General Public License
% as published by the Free Software Foundation; either version 2
% of the License, or (at your option) any later version.
% 
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
% GNU General Public License for more details.
%
% For a copy of the GNU General Public License, write to the 
% Free Software Foundation, Inc.,
% 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA,
% or find it on the net, for instance at
% http://www.gnu.org/copyleft/gpl.html
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Usage:
% in between \begin{Outline} ... \end{Outline}
% you can use the \Level command:
%
% \Level 0 {Top level heading}
% \Level 1 {next level}
% text on level one.
% \Level 1 {more on this level}
% \Level 2 {yet another level}
% et cetera.
%
% The levels are defined (for instance in the preamble or in an
% include file) by
% \OutlineLevelStart0{\chapter*{#1}}
% \OutlineLevelStart1{\section*{#1}}
% et cetera. For the `chapter' and `section' commands you
% can of course substitute any piece of LaTeX code. Be creative.
% These pieces of code are substituted every time you give a
% \Level{nn}{Title}
% command.
%
% Levels can be more complicated:
% \OutlineLevelStart3{\begin{description}\item[#1]}
% \OutlineLevelCont3{\item[#1]}
% \OutlineLevelEnd3{\end{description}}
% The `Start' code is used if you come from a lower-numbered level;
% the `Cont' code is used if two commands for the same level are given
% in a row, or when you come from a higher-numbered level
% (if you don't define any `Cont' code, the `Start' code is reused);
% the `End' code is issued when you give a lower-numbered level;
% it has no argument since this is only inserted automatically.
%
% The outline macros can generate their own page breaks. Use:
% \OutlinePageBreaks{2}
% to indicate the highest numbered level for which page breaks will
% be issued; to be precise, a \pagebreak command is issued every time
% a level `Cont' code is inserted. See above for when this happens.
%
% [Justification for issuing a pagebreak only on `Cont':
% Usually you don't want a pagebreak when you come from a lower numbered
% level; you will have to issue a pagebreak by hand if you want that.
% For example: if you have 'section' 'subsection' 'subsection' in a row,
% usually if you want a page break at the second subsection, you do not
% want it at the first, since typically there is no or only a little text
% in between the section and subsection heading. If you do want a break
% with every subsection, define both the LevelStart and LevelCont for
% that levels as {\pagebreak\subsection{#1}}.]
%
% The following command is handy if you want to include an outline,
% which typically starts at level 0, and have it start at a higher level:
% \SetBaseLevel{1}
% The baselevel thus declared is added to every outline level until you
% reset the base level to zero. This affects pagebreaks: the pagebreak
% level applies to the level in the source code *plus* the baselevel.
%
% If you go up by more than one level (say from 1 to 3), the level counter
% is increased but the action for the intermediate level (i.e., 2)
% is not performed.
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% change history.
% 0.92 : added vfill before pagebreak. better handling of baselevel shifts.
% 0.93 : pagebreak level initialized to -1. improved documentation.
%        jumping up the levels is now implemented.
%        error message if starting an undefined level (this used to work,
%        but no longer with phantom code in place).
% 0.95 : added Increase/DecreaseBaseLevel
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\newcounter{leveldepth}\newcounter{baselevel}\newcounter{tmplevel}

\newenvironment{Outline}%
 {\setcounter{leveldepth}{-1}\setcounter{baselevel}{0}}{\Level{-1}{}}

\newcommand{\LevelDefiner}[3]
 {\expandafter#1\expandafter{\csname Level#2#3\endcsname}[1]}
\newcommand{\OutlineLevelStart}[1]%
 {\expandafter\newif\csname ifPhantomLevel#1\endcsname
  \LevelDefiner{\newcommand}{#1}{Start}}
\newcommand{\OutlineLevelEnd}[1]%
 {\expandafter\newcommand\expandafter{\csname Level#1End\endcsname}}
\newcommand{\OutlineLevelCont}[1]%
 {\LevelDefiner{\newcommand}{#1}{Cont}}
\newcommand{\RenewOutlineLevelCont}[1]%
 {\LevelDefiner{\renewcommand}{#1}{Cont}}

\newcounter{pagebreaklevel}\setcounter{pagebreaklevel}{-1}
\newcommand{\OutlinePageBreaks}[1]{\setcounter{pagebreaklevel}{#1}}

\newif\ifOutlineTrace
\def\OutlineMsg#1{\message{[Outline] at line \the\inputlineno: #1}}
\newcommand{\StartLevel}[1]%
 {\expandafter\ifx\csname Level#1Start\endcsname\relax
    \errmessage{You did not define a start command on level #1}
  \else \ifOutlineTrace\OutlineMsg{start level #1}\fi \fi
  \csname PhantomLevel#1false\endcsname
  \csname Level#1Start\endcsname}
\newcommand{\PhantomStartLevel}[1]%
 {\ifOutlineTrace\OutlineMsg{phantom start level #1}\fi
  \csname PhantomLevel#1true\endcsname}
\newcommand{\EndLevel}[1]%
 {\ifOutlineTrace\OutlineMsg{end level #1}\fi
  \csname Level#1End\endcsname}
\newcommand{\PhantomEndLevel}[1]%
 {\ifOutlineTrace\OutlineMsg{Phantom end level #1}\fi}
\newcommand{\ContLevel}[1]%
 {\ifOutlineTrace\OutlineMsg{continue level #1}\fi
  \csname Level#1Cont\endcsname}
\newcommand{\HasNoContFunction}[1]%
 {00\fi \expandafter\ifx\csname Level#1Cont\endcsname\relax}

\newcommand{\MaybePageBreak}[1]%
 {\ifnum#1&gt;\value{pagebreaklevel}\else
    \ifOutlineTrace\OutlineMsg{breaking page}\fi
    \vfill\pagebreak
  \fi}
\newcommand{\PhantomLevel}[1]{00\fi \csname ifPhantomLevel#1\endcsname}

\newcommand{\Level}[1]{%
  \setcounter{tmplevel}{#1}\addtocounter{tmplevel}{\value{baselevel}}
  \ifnum\value{tmplevel}&gt;\value{leveldepth}
    \def\next{\HigherLevel{\arabic{tmplevel}}}
  \else
    \def\next{\SameOrLowerLevel{\arabic{tmplevel}}}
  \fi\next}
\newcommand{\SameOrLowerLevel}[1]{
  \ifnum#1&lt;\value{leveldepth}
    \ifOutlineTrace\OutlineMsg{To prev level #1 from \arabic{leveldepth}}\fi
    \PopLevels{#1}
  \else
    \setcounter{leveldepth}{#1} \fi
  \ifnum#1&lt;0\relax
  \else
    \MaybePageBreak{\arabic{leveldepth}}
    \if\PhantomLevel{\arabic{leveldepth}}%
      \ifOutlineTrace\OutlineMsg{encountering \arabic{leveldepth} after phantom}\fi
      \def\next{\StartLevel{\arabic{leveldepth}}}
    \else \if\HasNoContFunction{\arabic{leveldepth}}
        \ifOutlineTrace\OutlineMsg{use start function for continuation}\fi
        \def\next{\StartLevel{\arabic{leveldepth}}}
      \else
        \def\next{\ContLevel{\arabic{leveldepth}}}
    \fi\fi \expandafter\next
  \fi}
\newcommand{\HigherLevel}[1]{
    \addtocounter{leveldepth}{1}%
    \ifnum\value{leveldepth}&lt;#1\relax
      \ifOutlineTrace\OutlineMsg{Phantom next level &lt;\arabic{leveldepth}&gt;}\fi
      \PhantomStartLevel{\arabic{leveldepth}}%
      \def\next{\HigherLevel{#1}}%
    \else
      \ifOutlineTrace\OutlineMsg{To next level &lt;\arabic{leveldepth}&gt;}\fi
      \def\next{\StartLevel{\arabic{leveldepth}}}%
    \fi\next}

\newcommand{\PopLevels}[1]{%
    \if\PhantomLevel{\arabic{leveldepth}}%
        \PhantomEndLevel{\arabic{leveldepth}}\relax
      \else \EndLevel{\arabic{leveldepth}}\relax \fi
    \addtocounter{leveldepth}{-1}\relax
    \ifnum\value{leveldepth}&gt;#1\relax\PopLevels{#1}\fi}

\newcommand{\SetBaseLevel}[1]{\setcounter{baselevel}{#1}}
\newcommand{\IncreaseBaseLevel}[1]{\addtocounter{baselevel}{#1}}
\newcommand{\DecreaseBaseLevel}[1]{\addtocounter{baselevel}{-#1}}
\newcommand{\NextLevel}{%
    \setcounter{tmplevel}{\value{leveldepth}}%
    \addtocounter{tmplevel}{1}%
    \aftergroup{\aftergroup\value\aftergroup{%
    \aftergroup t\aftergroup m\aftergroup p%
      \aftergroup l\aftergroup e\aftergroup v\aftergroup e\aftergroup l%
    \aftergroup}\aftergroup}%
    }
\newcommand{\SameLevel}{%
    \setcounter{tmplevel}{\value{leveldepth}}%
    \aftergroup{\aftergroup\value\aftergroup{%
    \aftergroup t\aftergroup m\aftergroup p%
      \aftergroup l\aftergroup e\aftergroup v\aftergroup e\aftergroup l%
    \aftergroup}\aftergroup}%
    }
\newcommand{\SaveLevel}[1]{%
    \count11=\value{leveldepth}\relax
    \edef#1{\the\count11}}
\newcommand{\UseLevel}[1]{%
    \gdef\next{#1}%
    \aftergroup{\aftergroup\next\aftergroup}%
    }

\endinput
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