How do I combine formatted page numbers in an index

Question

If I format page numbers in an index, they show up in addition to non-formatted numbers. This minimal example:

\documentclass{article}
\usepackage{makeidx} \makeindex \begin{document} page 1    
\index{foo}        % normal page number
\index{foo|textbf} % bold page number
\index{bar}        % normal page number    
\pagebreak page 2
\index{bar|textbf} % bold page number
\printindex \end{document}

Creates the following index

bar, 1, 2
foo, 1, 1

But I would prefer to combine a normal page number and a formatted page number as bold page number and also allow formatted page number in page sequences:

bar, 1-2
foo, 1

Maybe page sequences are too complicate, for instance if page 1 and 3 are normal, but page 2 is formatted. But at least the duplicated single page number (in this example "1, 1") should not be there.

More precise I do not use textbf but a custom bfhref for hyperlinked page numbers, but this should not be the issue

\newcommand{\bfhref}[1]{\textbf{\hyperpage{#1}}}

Answer 1

The process from idx file to ind is controlled by the command makeindex. I can not find any options about your demand. An alternative way to remove those duplicated pages is to deal with *.ind file yourself. For example, you can replace the pattern num, \textbf{num} with \textbf{num}. It's easy to accomplish with any editor supporting regular expression replacement.

And by default only three or more successive pages will be abbreviated as a range.

e.g.

bar, 1, 2, 3--6 .

I think this is what you want.