% \NeedsTeXFormat{LaTeX2e}
% \ProvidesPackage{terms}
%
% \RequirePackage{makeidx}
% \makeindex
%
% Package "term" for short declaration of terms in a text, which then can be collected
%   more easily in an index or may be emphasized in the running text.
%
% Author: Thomas Eckert, eckert(@)mathematik.uni-marburg.de
%
% Wishlist:
%   1. Automatize the "!"-syntax of the \index command in package makeidx to get a subentry
%      only for  multiple subs, but a simple comma separation for single subs.
%   2. What about the idea in version 2 of saving the index entry for a term that it can
%      be reused by \term? Also labeling for complicated expressions?
%   3. Perhaps automatically apply "+/*"-syntax for composed expressions (multiple words or
%      at least words with "-" inside? Which order then?
%   4. A package option to disable the index.
%   5. English glossary?
%   6. A ";"-syntax for additional entries.
%   7. Also a ":"-syntax instead of the optional-brackets.
%   8. A new version with a "+*/"-syntax for the three possible combinations of "+,*".



% % Version 3: Introduced "+/*" syntax in entries for short declaration of terms.
% %
% % Provided commands
% %
% \newcommand\Term[2][\relax]{\t@rm[#1]{#2}{main}}
% \newcommand\term[2][\relax]{\t@rm[#1]{#2}{side}}
%   % Use as \Term[entry]{text} with optional argument <entry> set to <text> if omitted.
%   % Then, a "*" in <entry> as "A*B" leads to an index entry \index{B!A} for not-empty A.
%   % And one can produce one additional entry by a "+" sign anywhere in A xor B.
%   % For example "+Vektor-*Bündel" will be found under "Bündel!Vektor-" and "Vektor-Bündel".
% %
% \newcommand\English[1]{ (englisch \textit{#1})}% To note an English expression for the term.
% %
% \let\textmain\textit% In \t@rm{text}{entry}{#3} the formatting of the term in the text is done
% \let\textside\textit% via \csname text#3\endcsname resulting in \textmain for #3 as "main".
% %
% \let\main\textbf% Parameter #3 of \t@rm is directly transferred to \index{...|#3} for
% \let\side\textrm% formatting of the page numbers. Confirm the makeindex package.
% \def\see#1#2{\textit{#1}}
% %
% %
% % Implementation
% %
% \newcommand\t@rm[3][\relax]{%
%   \ifx\relax#1\splitTerm{#2}\else\splitTerm{#1}\fi% Find "+/*"-entries.
%   \if\relax\MajorB% Create a major index entry (optional marked by "*" sign)
%     \index{\MajorA|#3}%
%   \else%
%     \index{\MajorA!\MajorB|#3}%
%   \fi%
%   \if\relax\MinorA\else% Create an optional minor index entry (marked by "+" sign)
%     \if\relax\MinorB%
%       \index{\MinorA|#3}%
%     \else%
%       \index{\MinorA!\MinorB @\textit{\MinorB}|#3}%
%     \fi%
%   \fi%
%   \csname text#3\endcsname{\expandafter\DelPlus@\DelStar@#2**°++Â*}%
%     % Produce the text, formatted and cleared of all signs "+/*".
% }
% % Technical macros to find entries for a Term
% \newcommand\splitTerm[1]{%
%   \gdef\MajorA{\expandafter\Maj@rA\DelPlus@#1++Â**\relax*~}%
%   \gdef\MajorB{\expandafter\Maj@rB\DelPlus@#1++Â**\relax*~}%
%   \gdef\MinorA{\expandafter\Min@rA\DelStar@#1**°+\relax+~}%
%   \gdef\MinorB{\expandafter\Min@rB\DelStar@#1**°+\relax+~}%
% }
% \edef\DelPlus@#1+#2+#3Â*{#1#2}% #3 is only junk, but that's the trick:
% \edef\DelStar@#1*#2*#3°{#1#2}% use as \DelStar@#1**°, where #1 is some stuff
% \def\Maj@rA#1*#2*#3~{\if\relax#2#1\else#2\fi}
% \def\Maj@rB#1*#2*#3~{\if\relax#2\else#1\fi}
% \def\Min@rA#1+#2+#3~{\if\relax#2\else#2\fi}
% \def\Min@rB#1+#2+#3~{\if\relax#2\else#1\fi}



% Version 2 (trial): In \Term safe the entry text that it can be referred to by \term.
%   Problem: The Umlaute can't be used in \csname. No idea of some workaround.
%   Compare amsref package and (la)tex's (?) "do"-lists used there (extensive documentation).
%
% \newcommand\Term[2][\relax]{#2%
%   \ifx#1\or\relax%
%     \expandafter\ifx\csname T@rminus#2\endcsname\relax%
%       \index{#1}%
%     \else%
%       \index{\csname T@rminus#2\endcsname}%
%     \fi%
%   \else\index{#1}\fi%
% }



% Version 1: First use of "+"-symbol in the entry "syntax"
%
% \newcommand\Term[2][\relax]{%
%   % Use as \Term[entry]{text} with optional argument <entry> set to <text> if omitted.
%   % Then a "+" in <entry> as "A+B" leads to an additional call \index{B!A}.
%   % For example "Lorentz-+Metrik" will be found under "Lorentz-Metrik" and "Metrik!Lorentz-".
%   \ifx#1\relax%
%     \splitTerm#2++*% The ++* is to get proper syntax for the \splitTerm in any case.
%     \def\TermText{\TermA\TermB}% Deleted any "+".
%   \else%
%     \def\TermText{#2}% #2 is already clean
%     \splitTerm#1++*% as before, but now with #1
%   \fi%
%   \emph{\TermText}% Produce the emphasized text.
%   \index{\TermA\TermB|Main}% Create a (main) index entry.
%   \ifx\TermB{}\else
%     \index{\TermB!\TermA|see{\TermA\TermB}}% Second as marked by "+".
%   \fi%
% }
% % Technical macro to find additional entries for a term
% \def\splitTerm#1+#2+#3*{% Argument #3 only collects the unused remains.
%   \xdef\TermA{#1}%
%   \xdef\TermB{#2}%
% }

% \endinput