/usr/share/tth/tthntbib.sty is in tth-common 4.03+ds-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | % Style for authoryear type of natbib citations, including double
% optional argument handling.
% Conditional to determine if we are using number style references.
%\newif\ifNAT@numbers
% Formatting of citations requires 4 arguments unlike normal latex 1
% They are number, year, author, long-author. The format is changed
% within some types of references by local redefinition prior to
% calling cite. The default natbib formats for a plain \cite
% call when authordate are:
%\def\tthbibform#1#2#3#4{[#3 #2}
%\def\tthciteform#1#2#3#4{#3}
% and when numbers one uses argument #1
%\def\tthbibform#1#2#3#4{\ifNAT@numbers[#1\else[#3 #2\fi}
%\def\tthciteform#1#2#3#4{\ifNAT@numbers[#1\else#3, [#2\fi}
%\def\tthciteob{}\def\tthcitecb{]}
% All the above is builtin, together with setting NAT@numbers.
% \citet is a textual citation with parens only round the year
% Second optional argument is handled with a subcommand and conditional.
\def\tthpnote{}
\newcommand\tthsubcitet[2][]{\citet[#1]{#2} \egroup}
\newcommand\citet[2][]{%
\ifx #2[ \bgroup\def\tthpnote{#1\def\tthpnote{}} \tthsubcitet[\else%
{\def\tthcitecb{]}\def\tthcitefi{,}\def\tthcitepb{],}
\ifNAT@numbers%
\def\tthciteob{}
\def\tthciteform##1##2##3##4{##3 [\tthpnote ##1}
\else%
\def\tthciteform##1##2##3##4{##3 [\tthpnote ##2}
\fi%
\cite[#1]{#2}
}\fi}
% \citep has parens round the whole thing.
\newcommand\tthsubcitep[2][]{
\def\tthciteob{[}\def\tthcitecb{]}
\ifNAT@numbers
\def\tthciteform##1##2##3##4{\tthpnote\ ##1}\cite[#1]{#2}
\egroup%
\else
\def\tthciteform##1##2##3##4{\tthpnote\ ##3 ##2}\cite[#1]{#2}
\egroup%
\fi
}
\newcommand\citep[2][]{
\ifx #2[\bgroup\def\tthpnote{#1\def\tthpnote{}} \tthsubcitep[\else{%
\ifNAT@numbers \def\tthciteform##1##2##3##4{##1}
\else\def\tthciteform##1##2##3##4{##3, ##2}\fi%
\def\tthciteob{[}\def\tthcitecb{]}\cite[#1]{#2}}%
\fi}
% Additional types of natbib reference.
\newcommand\citeauthor[2][]{{%\def\tthciteob{}
\def\tthcitecb{}%
\def\tthciteform##1##2##3##4{##3}\cite[#1]{#2}}}
\newcommand\citeyear[2][]{{%\def\tthciteob{}
\def\tthcitecb{}
\def\tthciteform##1##2##3##4{##2}\cite[#1]{#2}}}
\newcommand\citeyearpar[2][]{{\def\tthciteob{[}\def\tthcitecb{]}
\def\tthciteform##1##2##3##4{##2}\cite[#1]{#2}}}
% bibpunct setting
\newcommand\bibpunct[7][, ]{
\def\tthciteob{#2}\def\tthcitecb{#3}\def\tthcitepb{#4}
\ifx#5n\NAT@numberstrue\else
\ifx#5s\NAT@numberstrue
\def\tthciteob{#2$^\bgroup}\def\tthcitecb{\egroup$#3}%
\else\NAT@numbersfalse
\fi
\fi
}
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