#!/bin/sh

########################################################################
### Parse Options
###

Gzip=:
SymOrLoc=""
Gz=""
Suffix=""

while true; do
    case $1 in
        -s | --symlinks  ) SymOrLoc="-s "      ;;
        -z | --compress  )     Gzip=$2;  shift ;;
	-e | --extension )       Gz=$2;  shift ;;
	-x | --suffix    )   Suffix=$2;  shift ;;
	-*) cat <<EOF
Unknown option "$1". Supported options:
    -s         Use symbolic links for manpages with multiple names.
    -z PROG    Use PROG to compress manual pages.
    -e EXT     Defines the extension added by -z PROG when compressing.
    -x SUFF    Defines an extra extension suffix to use.
Option names may not be combined getopt-style.
EOF
	    exit 1 ;;
	*)  break ;;
    esac
    shift
done
if test "$#" != 2; then
    echo "Usage: installManPages <options> file dir"
    exit 1
fi

########################################################################
### Parse Required Arguments
###

ManPage=$1
Dir=$2
if test -f $ManPage ; then : ; else
    echo "source manual page file must exist"
    exit 1
fi
if test -d $Dir ; then : ; else
    echo "target directory must exist"
    exit 1
fi
test -z "$SymOrLoc" && SymOrLoc="$Dir/"

########################################################################
### Extract Target Names from Manual Page
###

# A sed script to parse the alternative names out of a man page.
#
# Backslashes are trippled in the sed script, because it is in
# backticks which doesn't pass backslashes literally.
#
Names=`sed -n '
#                               Look for a line that starts with .SH NAME
    /^\.SH NAME/{
#                               Read next line
	n
#                               Remove all commas ...
	s/,//g
#                               ... and backslash-escaped spaces.
	s/\\\ //g
#                               Delete from \- to the end of line
	s/ \\\-.*//
#                               Convert all non-space non-alphanum sequences
#                               to single underscores.
	s/[^ A-Za-z0-9][^ A-Za-z0-9]*/_/g
#                               print the result and exit
	p;q
    }' $ManPage`

if test -z "$Names" ; then
    echo "warning: no target names found in $ManPage"
fi

########################################################################
### Remaining Set Up
###

case $ManPage in
    *.1) Section=1 ;;
    *.3) Section=3 ;;
    *.n) Section=n ;;
    *)	echo "unknown section for $ManPage"
	exit 2 ;;
esac

SrcDir=`dirname $ManPage`

########################################################################
### Process Page to Create Target Pages
###

First=""
for Target in $Names; do
    Target=$Target.$Section$Suffix
    rm -f $Dir/$Target $Dir/$Target.*
    if test -z "$First" ; then
	First=$Target
	sed -e "/man\.macros/r $SrcDir/man.macros" -e "/man\.macros/d" \
	    $ManPage > $Dir/$First
	chmod 644 $Dir/$First
	$Gzip $Dir/$First
    else
	ln $SymOrLoc$First$Gz $Dir/$Target$Gz
    fi
done

########################################################################
exit 0