register: spurious space & one more entry level ask

[Vit Zyka <vit.zyka@gmail.com>]

Dear ConTeXters,

there are 3 topics dealing with register (index):

1. [Spurious space] There are entries like
      \registerpage{index}{,}{5}{2--1-1-0-1-0-0-0--1}{2}
    in a *.tuo file. Since the definition (core-reg.tex)
      \def\dosetpageregisterpage#1#2#3#4#5#6%
        {\doifreglevelelse[#5]%
          {\dodosetpageregisterpage{#1}{#2}{#3}{#4}{#5}{#6}}%
          {}}
    there will be a spurious space between page number like
      Entry 23 , 67
    instead of
      Entry 23, 67

    Solution:
      \def\dosetpageregisterpage#1#2#3#4#5#6%
        {\doifreglevelelse[#5]%
          {\dodosetpageregisterpage{#1}{#2}{#3}{#4}{#5}{#6}}%
          {}\ignorespaces}

    Test file:
    --------------
    \starttext
      Text\index{test}.
      \page[yes]
      Paragraph\index{test}.
      \placeindex
    \stoptext
    --------------

2. [feature request] Current register implementation enable upto three 
entry level (\index{level 1+level 2+level 3}). My custommer require 4 
levels. Please could the entry number be extended?

3. [not important, just for info] Formating of the register entries is 
not much user friendly. See \hangindent1em in a following definition:

   \def\dosetpageregisterentrya#1#2%
     {\flushseenregisterpage
      \edef\currententrylevel{1}%
      \global\let\c!entryb\relax
      \global\let\c!entryc\relax
      \gdef\c!entrya
        {\iffirstregisterentry\else\endgraf\fi % new
         \global\firstregisterpagetrue
         \hangindent1em\noindent\c!entryreference
         \dohandlepageregisterentry{#1}{#2}%
         \global\firstregisterentryfalse
         \global\firstsubentrytrue
         \global\firstsubsubentrytrue}}

So, when one want the change formating he has to redefine this 
definition. It is against a ConTeXt spirit.

Best
Vit

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