ltabulary.sty

% Environnement `ltabulary` fusionnant `tabulary` avec `longtable`.
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{ltabulary}

\RequirePackage{longtable}
\RequirePackage{tabulary}

% The original code comes from <http://tex.stackexchange.com/questions/197687/several-caption-problems-in-longtable-and-tabulary/197808#197808>.
% CC-BY-SA 3.0 David Carlisle and justibus (LaTeX Stack Exchange)

%% define a new envrionment which marries longtable with tabulary
% from http://tex.stackexchange.com/questions/78075/multi-page-with-tabulary (see there for usage)
% with modifications taken from the ltxtable package to make captions work
\newcommand*\TY@cap@gobble[2][]{\\}% from ltxtable (adjusted)
\def\ltabulary{%
    \def\caption{% from ltxtable (adjusted)
        \@ifstar\TY@cap@gobble\TY@cap@gobble}
    \def\endfirsthead{\\}%
    \def\endhead{\\}%
    \def\endfoot{\\}%
    \def\endlastfoot{\\}%
    \def\tabulary{%
        \def\TY@final{%
    \def\endfirsthead{\LT@end@hd@ft\LT@firsthead}%
    \def\endhead{\LT@end@hd@ft\LT@head}%
    \def\endfoot{\LT@end@hd@ft\LT@foot}%
    \def\endlastfoot{\LT@end@hd@ft\LT@lastfoot}%
    \longtable}%
        \let\endTY@final\endlongtable
        \TY@tabular}%
    \dimen@\columnwidth
    \advance\dimen@-\LTleft
    \advance\dimen@-\LTright
    \tabulary\dimen@}
\def\endltabulary{\endtabulary}

\endinput