#! /bin/sh
#
#  @configure_input@
#
#  $Id: daily.in 0.12 2000/03/24 00:01:02 tom Exp $
#
#  daily.in:  Uses `daily[.awk|.pl]' for processing Gcal resource file lines
#               used for time management of fixed dates stored in the fixed
#               `DATE-PART HH1:MM1,HH2:MM2,%n,%t  FIXED-DATE-TEXT' format.
#               `HH1:MM1' is the time (HOUR:MINUTE) the fixed date takes place.
#               `HH2:MM2' is the time (HOUR:MINUTE) the fixed date is warned
#               in advance.  The valid range of HOUR is 00...23, and the
#               valid range of MINUTE is 00...59.  For example
#                 `0 08:15,00:30,%n,%t  Dentist'
#               creates a today's fixed date message of 30 minutes
#               starting at 07:45 until 08:15.
#
#               Usage: daily --help | --version
#               Usage: daily [--debug] [--mail[=ADDRESS]]
#                            [RESOURCE-FILE...] [more Gcal options...]
#
#               `--debug':           Turn on shell debugging.
#               `--mail[=ADDRESS]':  If any fixed date messages are created,
#                                      eMail them to the specified ADDRESS.
#                                      If no ADDRESS is given, eMail them
#                                      to $MAILTO, $USER or $LOGNAME.
#
#  UN*X solution.
#
#  Needs `test', `echo', `eval', `set', `sed', `date', `mail', `gcal'
#  and `perl' or `awk'  for processing!
#
#  Returns 0 if one or more fixed date is active (returned by AWK/Perl script
#            if neither `--help' nor `--version' option was specified).
#  Returns 1 in case no fixed date is active (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

#
# Basically used texts.
#
packagedatamiscdir=/usr/local/share/gcal/misc/daily
#
PACKAGE=@PACKAGE@
VERSION=@VERSION@
transform=@program_transform_name@
#
mydefaultname=daily
#
myname=`$Echo "$0" | $Sed -e 's,.*/,,' -e "$transform"`
myversion=0.12
myinternalname="$myname ($PACKAGE $VERSION) $myversion"
#
gcal_resource_file_suffix=.rc
gcal_resource_file=$mydefaultname""$gcal_resource_file_suffix
info1="$myname: Time management of fixed dates, which are stored"
info2="$myname: in a Gcal resource file by using the fixed format"
info3="$myname: \`DATE-PART HH1:MM1,HH2:MM2,%n,%t  FIXED-DATE-TEXT'."
info4="$myname:"
usage1="usage: $myname  --help | --version"
usage2="usage: $myname  [--debug] [--mail[=ADDRESS]] [RESOURCE-FILE...] [more Gcal options..]"
usage3="usage: $myname  without RESOURCE-FILE uses file "\
"\`$packagedatamiscdir/$gcal_resource_file' by default"

#
# Some constant values (EXIT_SUCCESS(==0) and EXIT_FAILURE(==1)
#   are also returned by the processed AWK/Perl script.
#
EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_FATAL=2

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

#
# Let's check for command line arguments.
#
debug=no
mail=no
opt_mail=""
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"
      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 ;;

    -mail=* | -mai=* | -ma=* | -m=* | -mail | -mai | -ma | -m | \
    --mail=* | --mai=* | --ma=* | --m=* | --mail | --mai | --ma | --m)
      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 ;;
  esac
done

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

#
# Let's start processing now.
#
if $Test -n "$Awk" || $Test -n "$Perl";
then
  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 -QUax -f $FILS $CMDS | \
            $Perl $packagedatamiscdir/$Perl_script`
  else
    result=`$ThisGcal $ARGS -QUax -f $FILS $CMDS | \
            $Awk -f $packagedatamiscdir/$Awk_script`
  fi
  status=$?
  if $Test "$status" -eq "$EXIT_FAILURE";
  then
    $Echo "$myname: no active fixed dates actually" 1>&2
  else
    #
    # Detect the proper eMail address.
    #
    if $Test "$mail" = yes;
    then
      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" 1>&2
              exit $EXIT_FAILURE
            fi
          fi
        fi
      fi
      if $Test -n "$MAILPROG";
      then
        ThisMail="$MAILPROG"
      fi
      if $Test "$debug" = no;
      then
        $Echo "$result" | $ThisMail -s "Mail from \`$myname' (`$Date`)" $MailAddr
      fi
      $Echo "$myname: active fixed dates sent by $ThisMail to \`$MailAddr'"
    else
      $Echo "$result"
    fi
  fi
  exit $status
else
  $Echo "$myinternalname: error: neither \`perl' nor \`awk' available" 1>&2
  exit $EXIT_FATAL
fi