contrib/groffer/groffer.sh

   1 #! /bin/sh
   2
   3 # groffer - display groff files
   4
   5 # Source file position: <groff-source>/contrib/groffer/groffer.sh
   6
   7 # Copyright (C) 2001,2002,2003,2004,2005
   8 # Free Software Foundation, Inc.
   9 # Written by Bernd Warken
  10
  11 # This file is part of groff version @VERSION@ (eventually 1.19.2).
  12
  13 # groff is free software; you can redistribute it and/or modify it
  14 # under the terms of the GNU General Public License as published by
  15 # the Free Software Foundation; either version 2, or (at your option)
  16 # any later version.
  17
  18 # groff is distributed in the hope that it will be useful, but WITHOUT
  19 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20 # or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  21 # License for more details.
  22
  23 # You should have received a copy of the GNU General Public License
  24 # along with groff; see the files COPYING and LICENSE in the top
  25 # directory of the groff source.  If not, write to the Free Software
  26 # Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA.
  27
  28 _PROGRAM_NAME='groffer';
  29 _PROGRAM_VERSION='0.9.20';
  30 _LAST_UPDATE='30 July 2005';
  31
  32
  33 ########################################################################
  34 # Determine the shell under which to run this script from the command
  35 # line arguments or $GROFF_OPT; if none is specified, just go on with
  36 # the starting shell.
  37
  38 if test _"${_GROFFER_RUN}"_ = __;
  39 then
  40   # only reached during the first run of the script
  41
  42   export _GROFFER_RUN;          # counter for the runs of groffer
  43   _GROFFER_RUN='first';
  44
  45   export _PROGRAM_NAME;
  46   export _PROGRAM_VERSION;
  47   export _LAST_UPDATE;
  48
  49   export GROFFER_OPT;           # option environment for groffer
  50   export _GROFFER_SH;           # file name of this shell script
  51   export _OUTPUT_FILE_NAME;     # output generated, see main_set_res..()
  52
  53   export _CONF_FILES;           # configuration files
  54   _CONF_FILES="/etc/groff/groffer.conf ${HOME}/.groff/groffer.conf";
  55
  56   case "$0" in
  57   *${_PROGRAM_NAME}*)
  58     _GROFFER_SH="$0";
  59     # was: _GROFFER_SH="@BINDIR@/${_PROGRAM_NAME}";
  60     ;;
  61   *)
  62     echo "The ${_PROGRAM_NAME} script should be started directly." >&2
  63     exit 1;
  64     ;;
  65   esac;
  66
  67   export _NULL_DEV;
  68   if test -c /dev/null;
  69   then
  70     _NULL_DEV="/dev/null";
  71   else
  72     _NULL_DEV="NUL";
  73   fi;
  74
  75
  76   # test of `unset'
  77   export _UNSET;
  78   export _foo;
  79   _foo=bar;
  80   _res="$(unset _foo 2>&1)";
  81   if unset _foo >${_NULL_DEV} 2>&1 && \
  82      test _"${_res}"_ = __ && test _"${_foo}"_ = __
  83   then
  84     _UNSET='unset';
  85     eval "${_UNSET}" _res;
  86   else
  87     _UNSET=':';
  88   fi;
  89
  90
  91   ###########################
  92   # _get_opt_shell ("$@")
  93   #
  94   # Determine whether `--shell' was specified in $GROFF_OPT or in $*;
  95   # if so, echo its argument.
  96   #
  97   # Output: the shell name if it was specified
  98   #
  99   _get_opt_shell()
 100   {
 101     case " ${GROFFER_OPT} $*" in
 102       *\ --shell\ *|*\ --shell=*)
 103         (
 104           eval set x "${GROFFER_OPT}" '"$@"';
 105           shift;
 106           _sh='';
 107           while test $# != 0
 108           do
 109             case "$1" in
 110               --shell)
 111                 if test "$#" -ge 2;
 112                 then
 113                   _sh="$2";
 114                   shift;
 115                 fi;
 116                 ;;
 117               --shell=?*)
 118                 # delete up to first `=' character
 119                 _sh="$(echo x"$1" | sed -e '
 120 s/^x//
 121 s/^[^=]*=//
 122 ')";
 123                 ;;
 124             esac;
 125             shift;
 126           done;
 127           cat <<EOF
 128 ${_sh}
 129 EOF
 130         )
 131         ;;
 132     esac;
 133   }
 134
 135
 136   ###########################
 137   # _test_on_shell (<name>)
 138   #
 139   # Test whether <name> is a shell program of Bourne type (POSIX sh).
 140   #
 141   _test_on_shell()
 142   {
 143     if test "$#" -le 0 || test _"$1"_ = __;
 144     then
 145       return 1;
 146     fi;
 147     # do not quote $1 to allow arguments
 148     test _"$(eval $1 -c "'"'s=ok; echo $s'"'" 2>${_NULL_DEV})"_ = _ok_;
 149   }
 150
 151
 152   ###########################
 153   # do the shell determination from command line and $GROFFER_OPT
 154   _shell="$(_get_opt_shell "$@")";
 155   if test _"${_shell}"_ = __;
 156   then
 157     # none found, so look at the `--shell' lines in configuration files
 158     export f;
 159     # for f in $_CONF_FILES
 160     for f in $(eval set x ${_CONF_FILES}; shift; echo "$@")
 161     do
 162       if test -f "$f";
 163       then
 164         _all="$(cat "$f" | sed -n -e 's/^--shell[= ] *\([^ ]*\)$/\1/p')"
 165         # for s in $_all
 166         for s in $(eval set x ${_all}; shift; echo "$@")
 167         do
 168           _shell="$s";
 169         done;
 170       fi;
 171     done;
 172     eval ${_UNSET} f;
 173     eval ${_UNSET} s;
 174     eval ${_UNSET} _all;
 175   fi;
 176
 177   export _GROFFER2_SH;            # file name of the script that follows up
 178   _GROFFER2_SH='@libdir@/groff/groffer/groffer2.sh';
 179
 180   # restart the script with the last found $_shell, if it is a shell
 181   if _test_on_shell "${_shell}";
 182   then
 183     _GROFFER_RUN='second';
 184     # do not quote $_shell to allow arguments
 185     eval exec ${_shell} "'${_GROFFER2_SH}'" '"$@"';
 186     exit;
 187   fi;
 188
 189   _GROFFER_RUN='second';
 190   eval ${_UNSET} _shell;
 191   eval exec "'${_GROFFER2_SH}'" '"$@"';
 192
 193 fi; # end of first run
 194
 195 if test _"${_GROFFER_RUN}"_ != _second_;
 196 then
 197   echo "$_GROFFER_RUN should be 'second' here." >&2
 198   exit 1
 199 fi;
 200
 201 eval ${_UNSET} _GROFFER_RUN