#!/bin/sh
# Generate a permuted index of all names.
# The result is a file called index.fns.

# Copyright (C) 2001 Free Software Foundation, Inc.
#
# This file is part of GNU Emacs.
#
# GNU Emacs is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# GNU Emacs is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Emacs; see the file COPYING.  If not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.

# You will need to modify this for your needs.


set TEXINDEX=texindex  # path to texindex command
#set EMACS=gnuemacs     # your emacs command
#set TEX=tex             # your tex command

set MANUAL=elisp  # the base name of the manual

# goto 3

1:
echo "Extract raw index from texinfo fn index."
# Let texindex combine duplicate entries, later.
# But it wants to protect non-alphanumerics thus confusing ptx.
# Also change `\ ' to just a ` ', since texindex will fail. This is produced 
# by `@findex two words' in an example environment (no doubt among others).
# delete wrapper parens
# change dots {} to dots{}
# change {-} to char form, so ptx wont ignore it.
# delete leading \entry {
# change '\ ' to ' '
# change lines with = < > since they mess up field extraction.
# separate into fields delimited by "
rm -f permuted.raw
cat ${MANUAL}.fn | \
	sed \
	-e 's/(\([^)]*\))/\1/' \
	-e 's/\\dots {}/(\\dots{})/' \
	-e "s/{-}/{{\\tt\\char'055}}/" \
	-e 's,^[^ ]* {,,' \
	-e 's, },},' \
	-e 's,\\ , ,g' \
	-e 's/{\\tt\\char61}/=/' \
	-e 's/{\\tt\\gtr}/>/' \
	-e 's/{\\tt\\less}/</' \
	-e 's/}{/"/g' \
	| awk -F\" '{print $2, $1}' > permuted.raw

2:
# Build break file for ptx.
cat <<EOF > permuted.break
-
:
EOF
# Build the ignore file for ptx.
# We would like to ignore "and", "or", and "for",
# but ptx ignores ignore words even if they stand alone.
cat <<EOF > permuted.ignore
the
in
to
as
a
an
of
on
them
how
from
by
EOF

echo "Make troff permuted index."
rm -f permuted.t
ptx -i permuted.ignore -b permuted.break -f -r -w 144 \
	 < permuted.raw > permuted.t

3:
echo "Extract the desired fields."
rm -f permuted.fields
awk -F\" '{printf "%s\"%s\"%s\n", $4,$6,$9}' permuted.t > permuted.fields

4:
echo "Format for texindex."
# delete lines that start with "and ", "for "
sed 	< permuted.fields \
	-e 's/=/{\\tt\\char61}/' \
	-e 's/>/{\\tt\\gtr}/' \
	-e 's/</{\\tt\\less}/' \
	-e '/"and /d' \
	-e '/"for /d' \
  | awk -F\" 'NF>0 {if ($1=="") {\
	  print "\entry {" $2 "}{" 0+$3 "}{" $2 "}" }\
	else {\
	  print "\entry {" $2 ", " $1 "}{" 0+$3 "}{" $2 ", " $1 "}"} }'\
	      > permuted.fn

5:
echo "Sort with texindex."
${TEXINDEX} permuted.fn
#mv permuted.fns ${MANUAL}.fns

# The resulting permuted.fns will be read when we run TeX 
# on the manual the second time.  Or you can use permuted.texinfo here.
#${TEX} permuted.texinfo

6:
echo "Clean up."
rm -f permuted.fields permuted.t permuted.raw
rm -f permuted.break permuted.ignore permuted.fn