igc2gpx

#!/bin/bash
# Convert a IGC track to GPX, keeping only the GPS data
#
# Tested with IGC files created by flyhigh
#
# TODO
# - currently nothing open
#
#      Version: $LastChangedRevision$
#  last change: $LastChangedDate$
#
#    Copyright (C) 2014 by Robert Lange <sd2k9@sethdepot.org>
#
#    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 of the License, or
#    (at your option) any later version.
#
#    This program 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/>.


# *** Settings ***
# None

# *** Settings you usually don't wanna change ***
# GPSbabel executable
GPSBABEL=gpsbabel

# Program name (no need to change)
PROGNAME=igc2gpx
# Input igc file (set from command line)
IGC_FILE=
# Output GPX file (set from command line)
GPX_FILE=


# *** Functions ***
# *** Command line parsing
get_options() {
  local opt
  local argcounter=1

  while [ -n "$*" ] ; do
      opt="$1"
      shift
      case $opt in
          -V|--version)
          # Version output
          REVISION='$LastChangedRevision: DEV$'
          REVISION=${REVISION#\$LastChangedRevision: }
          REVISION=${REVISION%\$}
          echo "$PROGNAME, Revision $REVISION"
          echo "(c) by Robert Lange <sd2k9@sethdepot.org>"
          echo "GNU General Public Licence version 3 applies"
          exit 0
          ;;
          -h|--help|'-?')
          # help text
          echo "$PROGNAME - Convert a IGC track to GPX, keeping only the GPS data"
          echo
          echo "Call: $PROGNAME input_igc_file [output_gpx_file]"
          echo
          echo "Options:"
          echo "  [-h|--help] - This screen"
          echo "  [-V|--version] - Print program version and exit"
          echo "  input_igc_file - Filename of the IGC file to convert"
          echo "  output_gpx_file - Output file name, derived from input file name when not set"
          exit 0
	  ;;
          *)
          # Store into 
     	  case $argcounter in
      	    1)
      		IGC_FILE="$opt"
      		;;
      	    2)
      		GPX_FILE="$opt"
      		;;
      	    *)
                  # Too many arguments
  	        echo "Too many arguments! See help text for usage"
  		exit 1
  		;;
      	  esac
          #increment argument counter
          let argcounter++
      	;;
      esac
  done
}

# *** Call Command Line Parsing
# When no options supplied then call help
if [ -z "$1" ]; then
    get_options "--help"
else
    get_options "$@"
fi

# *** Sanity Checks ***
# Parameter
if [ -z "$IGC_FILE" ]; then
   echo "No input file name given! See help text for usage"
   exit 1
fi
if [ ! -f "$IGC_FILE" ]; then
   echo "Input file $IGC_FILE not found!"
   exit 1
fi
# gpsbabel there?
if [ $(which $GPSBABEL > /dev/null) ]; then
   echo "$GPSBABEL executable not found!"
   exit 1
fi


# *** Derive output file name when not given
if [ -z "$GPX_FILE" ]; then
    GPX_FILE="${IGC_FILE%.*}.gpx"
fi


# *** Do the conversion
# Convert via gpsbabel
echo "$GPSBABEL -i igc -f $IGC_FILE -o gpx -F -"
GPX_DATA=$($GPSBABEL -i igc -f "$IGC_FILE" -o gpx -F -)
if [ $? -ne 0 ]; then
    echo "Failure invoking $GPSBABEL - Aborting"
    exit 1
fi
# Keep only GPS data
echo "Stripping Non-GPS (PRESALTTRK) data ..."
echo "$GPX_DATA" |  perl -e 'my $mt=""; while (<>) { $mt .= $_; }; $mt =~ s|<trk>[\s\n]*<name>PRESALTTRK</name>.+?</trk>||s; print $mt' > "$GPX_FILE"

if [ $? -ne 0 ]; then
    echo "Failure invoking perl - Aborting"
    exit 1
fi
echo "Done - wrote $GPX_FILE"