索引スタイルのベース

jpbase.ist

% jpbook.ist - general settings, part of mendex package.
% also works with makeindex.
% これは mendex スタイルファイルのサンプルです

%% Use general commands (M. Yamamoto, @munepi)
headings_flag    1
heading_prefix   "\n\\makeidxhead{"
heading_suffix   "}"
%
delim_0          "\\idxdelim "
delim_1          "\\idxdelim "
delim_2          "\\idxdelim "
%
symhead_positive "\\symbolindexname"
%
% for mendex
%  * heading_flag <=> headings_flag difference (limitation)
%  * symhead_positive unrecognized if character_order is changed
%    (bug: https://github.com/texjporg/tex-jp-build/issues/117)
heading_flag     1
symbol           "\\symbolindexname"

%% Custom settings for mendex
% 見出しをひらがなで出力: 2（既定値はカタカナ: 1）
letter_head      2
% 並べ替え順を日本語→英字→記号／数字に変更
character_order  "JESN"

%% Output design based on dot.ist by Y. Kumazawa
%%  - sample definitions are provided below.
%%  - you can customize the design by redefining
%%    \idxdelim, \makeidxhead and \symbolindexname in your LaTeX file.
preamble   "\\begin{theindex}\n
\\providecommand\\idxdelim{\\space\\dotfill\\space}
\\providecommand\\makeidxhead[1]{{\\vbox{\\hbox to \\linewidth{\\sffamily\\bfseries #1\\ \\hskip\\fill}\\vskip1pt\\hrule}}\\nopagebreak}
\\providecommand\\symbolindexname{記号／数字}\n"
postamble  "\n\n\\end{theindex}\n"

texjporg/mendex-doc#11 参照。