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#!/usr/bin/env texlua
-- splitindex.tlu
-- Copyright (c) Markus Kohm, 2013-2014
--
-- $Id: splitindex_main.tlu 4 2016-02-18 10:13:32Z mjk $
--
-- This file is part of the SplitIndex bundle.
--
-- This work may be distributed and/or modified under the conditions of
-- the LaTeX Project Public License, version 1.3c of the license.
-- The latest version of this license is in
--   http://www.latex-project.org/lppl.txt
-- and version 1.3c or later is part of all distributions of LaTeX
-- version 2005/12/01 or later and of this work.
--
-- This work has the LPPL maintenance status "author-maintained".
--
-- The Current Maintainer and author of this work is Markus Kohm.
--
-- The list of all files belongig to the SplitIndex bundle is given in
-- in the file `manifest.txt'. Files generated by means of unpacking the
-- distribution (using, for example, the docstrip program) or by means
-- of compiling them from a source file, for example, from splitindex.c
-- or splitindex.java may be distributed at the distributor's discretion.
-- However if they are distributed then a copy of the SplitIndex bundle
-- must be distributed together with them.
--
-- The list of derived (unpacked or compiled) files belongig to the 
-- distribution and covered by LPPL is defined by the unpacking scripts 
-- (with extension .ins) and the installation script (with name 
-- install.sh) which are part of the distribution.
--
-- Two often ignorred clauses from LPPL 1.3c you should not ignore:
-- ----------------------------------------------------------------
-- 2. You may distribute a complete, unmodified copy of the Work as you
--    received it.  Distribution of only part of the Work is considered
--    modification of the Work, and no right to distribute such a Derived
--    Work may be assumed under the terms of this clause.
-- 3. You may distribute a Compiled Work that has been generated from a
--    complete, unmodified copy of the Work as distributed under Clause 2
--    above, as long as that Compiled Work is distributed in such a way that
--    the recipients may install the Compiled Work on their system exactly
--    as it would have been installed if they generated a Compiled Work
--    directly from the Work.

local version_number = string.sub( '$Revision: 4 $', 12, -2 )
local action_version = ' r'..version_number..'\n'..[[
Copyright (c) 2013 Markus Kohm.
License: lppl 1.3c or later. See <http://www.latex-project.org/lppl.txt>.
]]
local action_help = [[
options:
  -h, --help    Print this help message.
  -i, --identify <regular expression>
                Setup the regular expression to match the entries.
  -m, --makeindex <program name>
                Use <program name> instead of `makeindex'.
  -r, --resultis <pattern>
                Create line to be written from <pattern> after matching.
  -s, --suffixis <pattern>
                Create suffix to be used from <pattern> after matching.
  -v, --verbose Be more verbose.
  -V,--version  Print the version information.
]]

local action_opts = {
   ['-h']               = 'help',
   ['--help']           = 'help',
   ['-i']               = 'identify',
   ['--identify']       = 'identify',
   ['-m']               = 'makeindex',
   ['--makeindex']      = 'makeindex',
   ['-r']               = 'resultis',
   ['--resultis']       = 'resultis',
   ['-s']               = 'suffixis',
   ['--suffixis']       = 'suffixis',
   ['-v']               = 'verbose',
   ['--verbose']        = 'verbose',
   ['-V']               = 'version',
   ['--version']        = 'version',
   ['--']               = '--',
}

local identify = '^(\\indexentry)%[([^]]*)%](.*)$'
local makeindex = 'makeindex'
local resultis = '%1%3'
local suffixis = '-%2'
local verbose = 0

while arg[1] do
   local action = action_opts[arg[1]]
   if action == '--' then
      table.remove(arg,1)
      break
   elseif action == 'help' then
      print( arg[0]..action_version )
      print( 'Usage: ' .. arg[0] .. ' -h/--help' )
      print( '       ' .. arg[0] .. ' -V/--version' )
      print( '       ' .. arg[0] .. ' [<option> ...] \\ \
                        <intermediate index file> \\ \
                        [<makeindex option> ...]' )
      print( action_help );
      os.exit( 0 );
   elseif action == 'identify' then
      table.remove(arg,1)
      if arg[1] == nil then
	 error( 'value expected after option -i or --identify' )
      end
      identify = arg[1]
      table.remove(arg,1)
   elseif action == 'makeindex' then
      table.remove(arg,1)
      if arg[1] == nil then
	 error( 'value expected after option -m or --makeindex' )
      end
      makeindex = arg[1]
      table.remove(arg,1)
   elseif action == 'resultis' then
      table.remove(arg,1)
      if arg[1] == nil then
	 error( 'value expected after option -r or --resultis' )
      end
      resultis = string.gsub(arg[1],'%$','%%')
      table.remove(arg,1)
   elseif action == 'suffixis' then
      table.remove(arg,1)
      if arg[1] == nil then
	 error( 'value expected after option -s or --suffixis' )
      end
      suffixis = string.gsub(arg[1],'%$','%%')
      table.remove(arg,1)
   elseif action == 'verbose' then
      table.remove(arg,1)
      verbose = verbose + 1
   elseif action == 'version' then
      print( arg[0] .. action_version );
      os.exit( 0 );
   else
      break;
   end
end

if arg[1] == nil then
   error( 'intermediate file missing' )
end

local ifilename = arg[1]
table.remove(arg,1)
local bfilename = string.gsub(ifilename,'^(.*)%.idx$','%1')

local f=io.open(ifilename,"rb")
if f~=nil then io.close(f);
elseif ifilename ~= bfilename..'.idx' then
    f=io.open(bfilename..'.idx',"rb")
    if f~=nil then
       io.close(f)
       ifilename=bfilename..'.idx'
    end
end

local makeindexargs=''
while arg[1] do
   makeindexargs = makeindexargs..' "'..arg[1]..'"'
   table.remove(arg,1)
end

local ofiles={}

local line
for line in io.lines(ifilename) do
   local newline=string.gsub(line,identify,resultis)
   local ext,matches=string.gsub(line,identify,suffixis)
   if matches == 0 then
      ext = string.gsub(suffixis,'%%[1234567890]','idx')
   end
   if ofiles[ext] == nil then
      local msg
      ofiles[ext],msg = io.open(bfilename..ext..'.idx','w')
      if ofiles[ext] == nil then error(msg) end
   end
   assert( ofiles[ext]:write(newline,"\n") )
end

local k,v
for k,v in pairs(ofiles) do
   assert( v:close() )
   local cmd=makeindex..makeindexargs..' "'..bfilename..k..'.idx"'
   if makeindex ~= '' then
      local s,t,n=os.execute(cmd)
      if not s then
	 error('failed to execute ' .. cmd )
      end
   end
end

--
-- End of file `splitindex.tlu'