#! /bin/sh
#
#  @configure_input@
#
#  $Id: mrms.in 0.02 2000/03/24 00:00:02 tom Exp $
#
#  mrms.in:  Uses `mrms[.awk|.pl]' for processing the Gcal `mrms.rc' resource
#              file to display the times at which moonrise/moonset has happened
#              in the past respectively will happen in the future, based on
#              the actual local time.  If a Gcal resource file is specified
#              as program option, this resource file is used instead of the
#              default resource file `mrms.rc'.
#
#              Usage: mrms --help | --version
#              Usage: mrms [--debug] [--mail[=ADDRESS]]
#                          [--no-pager] [--mode=rise|set] [--sort=abs|rel]
#                          [RESOURCE-FILE] [more Gcal options...]
#
#              `--debug':          Turn on shell debugging.
#              `--mail[=ADDRESS]': EMail the result to the specified ADDRESS.
#                                    If no ADDRESS is given, eMail it to
#                                    $MAILTO, $USER or $LOGNAME.
#              `--no-pager':       Disable the use of a pager program.
#              `--mode=rise':      Display the moonrise local times of the
#                                    locations.
#              `--mode=set':       Display the moonset local times of the
#                                    locations.  If this option is not given,
#                                    `--mode=rise' is used by default.
#              `--sort=abs':       The sort order of the past times (indicated
#                                    by a `-' sign) respectively future times
#                                    (indicated by a `+' sign) is absolute.
#              `--sort=rel':       The sort order of the past times (indicated
#                                    by a `-' sign) respectively future times
#                                    (indicated by a `+' sign) is relative.
#                                    If this option is not given, `--mode=abs'
#                                    is used by default.
#
#  UN*X solution.
#
#  Needs `test', `echo', `eval', `set', `sed', `date', `mail', `sort',
#  `gcal' and `perl' or `awk' for processing!
#
#  Returns 0 if any fixed dates are created (returned by AWK/Perl script
#            if neither `--help' nor `--version' option was specified).
#  Returns 1 in case no fixed dates are created (returned by AWK/Perl script).
#  Returns 2 if neither Perl nor AWK are present for further processing.
#
#  Copyright (c) 2000  Thomas Esken      <esken@uni-muenster.de>
#                      Im Hagenfeld 84
#                      D-48147 M"unster
#                      GERMANY
#
#  This software doesn't claim completeness, correctness or usability.
#  On principle I will not be liable for ANY damages or losses (implicit
#  or explicit), which result from using or handling my software.
#  If you use this software, you agree without any exception to this
#  agreement, which binds you LEGALLY !!
#
#  This program 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, or (at your option)
#  any later version.
#
#  You should have received a copy of the `GNU General Public License'
#  along with this program; if not, write to the:
#
#
#

#
# Basically used programs.
#
Sed=sed
Set=set
Test=test
Echo=echo
Sort=sort

#
# Basically used texts.
#
packagedatamiscdir=/usr/local/share/gcal/misc/mrms
#
PACKAGE=@PACKAGE@
VERSION=@VERSION@
transform=@program_transform_name@
#
mydefaultname=mrms
#
myname=`$Echo "$0" | $Sed -e 's,.*/,,' -e "$transform"`
myversion=0.01
myinternalname="$myname ($PACKAGE $VERSION) $myversion"
#
param1=rise
param2=set
param3=abs
param4=rel
#
gcal_resource_file_suffix=.rc
gcal_resource_file=$mydefaultname""$gcal_resource_file_suffix
#
info1="$myname: Displays the times at which moon""$param1/moon""$param2 has happened in the"
info2="$myname: past respectively will happen in the future, based on the actual"
info3="$myname: local time for several geographic locations around the world."
info4="$myname:"
usage1="usage: $myname  --help | --version"
usage2="usage: $myname  [--debug] [--mail[=ADDRESS]] [--no-pager] [--mode=$param1|$param2]"
usage3="usage:            [--sort=$param3|$param4] [RESOURCE-FILE] [more Gcal options...]"
usage4="usage: $myname  without \`--mode=$param1|$param2' option uses \`--mode=$param1' by default"
usage5="usage: $myname  without \`--sort=$param3|$param4'  option uses \`--sort=$param3'  by default"
usage6="usage: $myname  without RESOURCE-FILE uses file "\
"\`$packagedatamiscdir/$gcal_resource_file' by default"

#
# Some constant values.
#
EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_FATAL=2

#
# The used programs.
#
Eval=eval
Date=date
ThisMail=mail
ThisGcal=/usr/local/bin/gcal
Pager1=@PAGER1@
Pager2=@PAGER2@
Pager3=@PAGER3@
#
Awk=@AWK@
Awk_script=$mydefaultname"".awk
#
Perl=@PERL@
Perl_script=$mydefaultname"".pl

#
# Let's check for command line arguments.
#
debug=no
pager=yes
mail=no
opt_mail=""
opt_mode=""
opt_sort=""
previous=""
for option in $*
do
  #
  # If the previous option needs an argument, assign it.
  #
  if $Test -n "$previous";
  then
    $Eval "$previous=\$option"
    previous=""
    continue
  fi

  case "$option" in
    -*=)  optarg="###error###" ;;
    -*=*) optarg=`$Echo "$option" | $Sed 's/[-_a-zA-Z0-9]*=//'` ;;
    *)    optarg="" ;;
  esac

  #
  # Manage the options.
  #
  case "$option" in
    -help=* | -hel=* | -he=* | -h=* | -help | -hel |-he | -h | \
    --help=* | --hel=* | --he=* | --h=* | --help | --hel | --he | --h)
      if $Test -n "$optarg";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=.*//'`' doesn't allow an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      $Echo "$info1"
      $Echo "$info2"
      $Echo "$info3"
      $Echo "$info4"
      $Echo "$usage1"
      $Echo "$usage2"
      $Echo "$usage3"
      $Echo "$usage4"
      $Echo "$usage5"
      $Echo "$usage6"
      exit $EXIT_SUCCESS ;;

    -version=* | -versio=* | -versi=* | -vers=* | -ver=* | -ve=* | -v=* | \
    -version | -versio | -versi | -vers | -ver | -ve | -v | \
    --version=* | --versio=* | --versi=* | --vers=* | --ver=* | --ve=* | --v=* | \
    --version | --versio | --versi | --vers | --ver | --ve | --v)
      if $Test -n "$optarg";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=.*//'`' doesn't allow an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      $Echo "$myinternalname"
      exit $EXIT_SUCCESS ;;

    -debug=* | -debu=* | -deb=* | -de=* | -d=* | \
    -debug | -debu | -deb | -de | -d | \
    --debug=* | --debu=* | --deb=* | --de=* | --d=* | \
    --debug | --debu | --deb | --de | --d)
      if $Test -n "$optarg";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=.*//'`' doesn't allow an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      debug=yes
      shift ;;

    -no-pager=* | -no-page | -no-pag=* | -no-pa=* | -no-p=* | -no-=* | -no=* | -n=* | \
    -no-pager | -no-page | -no-pag | -no-pa | -no-p | -no- | -no | -n | \
    --no-pager=* | --no-page=* | --no-pag=* | --no-pa=* | --no-p=* | --no-=* | --no=* | --n=* | \
    --no-pager | --no-page | --no-pag | --no-pa | --no-p | --no- | --no | --n)
      if $Test -n "$optarg";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=.*//'`' doesn't allow an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      pager=no
      shift ;;

    -mail | -mai | -ma | --mail | --mai | --ma | \
    -mail=* | -mai=* | -ma=* | --mail=* | --mai=* | --ma=*)
      if $Test "$optarg" = "###error###";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=//g'`' requires an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      opt_mail="$optarg"
      mail=yes
      shift ;;

    -mode | -mod | -mo | --mode | --mod | --mo)
      previous=mode ;;
    -mode=* | -mod=* | -mo=* | --mode=* | --mod=* | --mo=*)
      if $Test -z "$optarg" || $Test "$optarg" = "###error###";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=//g'`' requires an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      opt_mode="$optarg"
      shift ;;

    -sort | -sor | -so | -s | --sort | --sor | --so | --s)
      previous=sort ;;
    -sort=* | -sor=* | -so=* | -s=* | --sort=* | --sor=* | --so=* | --s=*)
      if $Test -z "$optarg" || $Test "$optarg" = "###error###";
      then
        $Echo "$myname: error: option \``$Echo $option | $Sed -e 's/=//g'`' requires an argument" 1>&2
        exit $EXIT_FAILURE
      fi
      opt_sort="$optarg"
      shift ;;
  esac
done

if $Test -n "$previous";
then
  $Echo "$myname: error: missing argument to --$previous" 1>&2
  exit $EXIT_FAILURE
fi

#
# Enable tracing.
#
if $Test "$debug" = yes;
then
  $Set -x
fi

#
# Let's start processing now.
#
if $Test -n "$Awk" || $Test -n "$Perl";
then
  SCRIPT_ARGS=""
  if $Test -n "$opt_mode";
  then
    arg=`$Echo "$opt_mode" | $Sed -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
    if $Test "$arg" = "$param1" || $Test "$arg" = "$param2";
    then
      SCRIPT_ARGS="-a""$arg"
    else
      $Echo "$myname: error: invalid option argument \`$opt_mode' specified" 1>&2
      $Echo "$myname: use --help to show usage" 1>&2
      exit $EXIT_FAILURE
    fi
  fi
  if $Test -n "$opt_sort";
  then
    arg=`$Echo "$opt_sort" | $Sed -e 'y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/'`
    if $Test "$arg" = "$param3" || $Test "$arg" = "$param4";
    then
      SCRIPT_ARGS="$SCRIPT_ARGS -b""$arg"
    else
      $Echo "$myname: error: invalid option argument \`$opt_sort' specified" 1>&2
      $Echo "$myname: use --help to show usage" 1>&2
      exit $EXIT_FAILURE
    fi
  fi
  ARGS=""
  CMDS=""
  FILS=""
  for arg in $*
  do
    case "$arg" in
      -*) ARGS="$ARGS $arg" ;;
      /*) ARGS="$ARGS $arg" ;;
      @*) ARGS="$ARGS $arg" ;;
      %*) ARGS="$ARGS $arg" ;;
      [0-9*]*) CMDS="$CMDS $arg" ;;
      *) if $Test -z "$FILS";
         then
           FILS="$arg"
         else
           FILS="$FILS+$arg"
         fi
    esac
  done
  if $Test -z "$FILS";
  then
    FILS=$packagedatamiscdir/$gcal_resource_file
  fi
  if $Test "$mail" = no;
  then
    ARGS="$ARGS -Hyes"
  fi
  #
  # We prefer the use of Perl.
  #
  if $Test -n "$Perl";
  then
    result=`$ThisGcal $ARGS -QUx -f $FILS $CMDS | \
            $Perl -- $packagedatamiscdir/$Perl_script $SCRIPT_ARGS`
  else
    result=`$ThisGcal $ARGS -QUx -f $FILS $CMDS | \
            $Awk -f $packagedatamiscdir/$Awk_script $SCRIPT_ARGS`
  fi
  status=$?
  if $Test "$status" -eq "$EXIT_SUCCESS";
  then
    if $Test "$mail" = yes;
    then
      #
      # Detect the proper eMail address.
      #
      if $Test -n "$opt_mail";
      then
        MailAddr="$opt_mail"
      else
        if $Test -n "$MAILTO";
        then
          MailAddr="$MAILTO"
        else
          if $Test -n "$USER";
          then
            MailAddr="$USER"
          else
            if $Test -n "$LOGNAME";
            then
              MailAddr="$LOGNAME"
            else
              $Echo "$myname: warning: cannot send mail, address unknown" 1>&2
              $Echo "$result" | $Sort | $Sed -e 's/^\(.......\)//' 1>&2
              exit $EXIT_FAILURE
            fi
          fi
        fi
      fi
      #
      # EMail the result.
      #
      if $Test -n "$MAILPROG";
      then
        ThisMail="$MAILPROG"
      fi
      if $Test "$debug" = no;
      then
        $Echo "$result" | $Sort | $Sed -e 's/^\(.......\)//' | \
          $ThisMail -s "Mail from \`$myname' (`$Date`)" $MailAddr
      fi
      $Echo "$myname: result sent by $ThisMail to \`$MailAddr'"
    else
      #
      # Detect a proper pager.
      #
      ThisPager=""
      if $Test "$pager" = yes;
      then
        if $Test -n "$Pager1";
        then
          ThisPager="$Pager1"
        else
          if $Test -n "$Pager2";
          then
            ThisPager="$Pager2"
          else
            if $Test -n "$Pager3";
            then
              ThisPager="$Pager3"
            fi
          fi
        fi
      fi
      #
      # Display the result.
      #
      if $Test -n "$ThisPager";
      then
        $Echo "$result" | $Sort | $Sed -e 's/^\(.......\)//' | $ThisPager
      else
        $Echo "$result" | $Sort | $Sed -e 's/^\(.......\)//'
      fi
    fi
  else
    if $Test "$status" -eq "$EXIT_FAILURE";
    then
      $Echo "$myname: error: no moonrise/moonset times found" 1>&2
    else
      if $Test "$status" -eq "$EXIT_FATAL";
      then
        if $Test -n "$Perl";
        then
          $Echo "$myinternalname: error: invalid option \`$SCRIPT_ARGS' to \`$Perl' given" 1>&2
        else
          $Echo "$myinternalname: error: invalid option \`$SCRIPT_ARGS' to \`$Awk' given" 1>&2
        fi
      fi
    fi
  fi
  exit $status
else
  $Echo "$myinternalname: error: neither \`perl' nor \`awk' available" 1>&2
  exit $EXIT_FATAL
fi