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#! /usr/local/bin/gawk -f
# texi.outline --- produce an outline from a texinfo source file
#
# Copyright (C) 1998 Arnold David Robbins (arnold@gnu.org)
#
# TEXI.OUTLINE 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 3 of the License, or
# (at your option) any later version.
#
# TEXI.OUTLINE 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 this program. If not, see <http://www.gnu.org/licenses/>.
# NOTE:
# This program uses gensub(), which is specific to gawk.
# With some work (split, substr, etc), it could be made to work
# on other awks, but it's not worth the trouble for me.
BEGIN \
{
# Levels at which different nodes can be
Level["@top"] = 0
Level["@appendix"] = 1
Level["@chapter"] = 1
Level["@majorheading"] = 1
Level["@unnumbered"] = 1
Level["@appendixsec"] = 2
Level["@heading"] = 2
Level["@section"] = 2
Level["@unnumberedsec"] = 2
Level["@unnumberedsubsec"] = 3
Level["@appendixsubsec"] = 3
Level["@subheading"] = 3
Level["@subsection"] = 3
Level["@appendixsubsubsec"] = 4
Level["@subsubheading"] = 4
Level["@subsubsection"] = 4
Level["@unnumberedsubsubsec"] = 4
# insure that we were called correctly
if (ARGC != 2) {
printf("usage: %s texinfo-file\n", ARGV[0]) > "/dev/stderr"
exit 1
}
# init header counters
app_letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
app_h = 0
l1_h = l2_h = l3_h = l4_h = 0
}
# skip lines we're not interested in
/^[^@]/ || ! ($1 in Level) { next }
Level[$1] == 1 {
if ($1 !~ /^@unnumbered/ || $1 !~ /heading/)
l1_h++
l2_h = l3_h = l4_h = 0
Ntabs = 0
Number = makenumber($1)
Title = maketitle($0)
print_title()
}
Level[$1] == 2 {
l2_h++
l3_h = l4_h = 0
Ntabs = 1
Number = makenumber($1)
Title = maketitle($0)
print_title()
}
Level[$1] == 3 {
l3_h++
l4_h = 0
Ntabs = 2
Number = makenumber($1)
Title = maketitle($0)
print_title()
}
Level[$1] == 4 {
l4_h++
Ntabs = 3
Number = makenumber($1)
Title = maketitle($0)
print_title()
}
# maketitle --- extract title
function maketitle(str, text)
{
$1 = "" # clobber section keyword
text = $0
gsub(/^[ \t]*/, "", text)
text = gensub(/@[a-z]+{/, "", "g", text)
text = gensub(/([^@])}/, "\\1", "g", text)
return text
}
# print_title --- print the title
function print_title( i)
{
for (i = 1; i <= Ntabs; i++)
printf "\t"
printf("%s %s\n", Number, Title)
}
# makenumber --- construct a heading number from levels and section command
function makenumber(command, result, lev1)
{
result = ""
if (command ~ /^@appendix/) {
if (Level[command] == 1)
app_h++
lev1 = substr(app_letters, app_h, 1)
} else if (command ~ /^@unnumbered/ || command ~ /heading/) {
lev1 = "(unnumbered)"
} else
lev1 = l1_h ""
result = lev1 "."
if (l2_h > 0) {
result = result l2_h "."
if (l3_h > 0) {
result = result l3_h "."
if (l4_h > 0) {
result = result l4_h "."
}
}
}
return result
}
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