John R. Culleton wrote:

I like the extended feature set of makeindex so I creatred my own little routine to use it with Context on a recent project. Here is the code:

\newwrite\ind \immediate\openout\ind=book.idx \def\sidx#1{\write\ind{\\indexentry{#1}{\the\pageno}}}

It works fine from the indexing point of view. But if the \sidx{} tag is embedded in a paragraph then some extra space is left where the tag existed in the paragraph. I had to move all such tags to either the beginning or the end of the paragraph.

What did I fail to do?

The one thing missing from your example is the thing that is causing the spaces: the actual input file. The definitions above look fine, and are certainly not the cause. Cheers, Taco