gpx_to_skiz.sh

#!/bin/bash

set -e
clear -x

echo "###########################################"
echo "               .GPX TO .SKIZ               "
echo "               by Alexbelgium              "
echo "###########################################"
echo ""
echo "This app will take all .gpx from the folder it is executed, and convert it to .skiz format compatible with Ski Tracks"
echo "The converted files will be stored in a new folder named gpx_to_skiz"
echo ""
echo "https://github.com/alexbelgium/gpx_to_skiz"
echo ""
echo "###########################################"

########################
# Install dependencies #
########################
echo "Installing dependencies, please wait"
if command -v "apt" &>/dev/null; then
    # If apt-get based
    echo "Apt based distribution detected..."
    if ! command -v "gpsbabel" &>/dev/null; then
        read -p "GPSbabel not installed, proceed with installation (y/n)?" choice
        case "$choice" in 
          y|Y ) echo "yes";;
          n|N ) echo "no, exiting"; exit 0;;
          * ) echo "invalid"; exit 1;;
        esac
        apt-get update >/dev/null
        if ! command -v "zip" &>/dev/null; then
            echo "... zip"
            apt-get install -yqq zip >/dev/null
        fi
        echo "... gpsbabel"
        apt-get install -yqq gpsbabel >/dev/null
     fi
elif command -v "apk" &>/dev/null; then
    # If apk based https://github.com/giacinti/gpsbabel-docker/blob/main/Dockerfile   
    echo "Apk based distribution detected..."
    if ! command -v "gpsbabel" &>/dev/null; then
        read -p "GPSbabel not installed, proceed with installation (y/n)? This will also add the edge repositories to your apk store." choice
        case "$choice" in 
          y|Y ) echo "yes";;
          n|N ) echo "no, exiting"; exit 0;;
          * ) echo "invalid"; exit 1;;
        esac
        if ! command -v "zip" &>/dev/null; then
            echo "... zip"
            apk add zip --no-cache
        fi
        echo "... gpsbabel : adding edge repositories"
        sed -i "/edge/d" /etc/apk/repositories
        echo "https://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories
        echo "https://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
        echo "https://dl-cdn.alpinelinux.org/alpine/edge/releases" >> /etc/apk/repositories
        echo "https://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories
        echo "... gpsbabel : installing"
        apk add gpsbabel --no-cache
    fi
else
    echo "Filesystem not supported, please use alpine or ubuntu"
    exit 1
fi

# Prepare directory
echo "Making gpx_to_skiz directory"
mkdir -p gpx_to_skiz

# Download reference file
echo "Downloading nodes.style"
if [ -f gpx_to_skiz/nodes.style ]; then rm gpx_to_skiz/nodes.style; fi
curl -f -L https://raw.githubusercontent.com/alexbelgium/gpx_to_skiz/main/helper/nodes.style --output gpx_to_skiz/nodes.style
echo "Downloading template"
if [ -f gpx_to_skiz/Track.xml ]; then rm gpx_to_skiz/Track.xml; fi
curl -f -L https://raw.githubusercontent.com/alexbelgium/gpx_to_skiz/main/helper/Track.xml --output gpx_to_skiz/Track.xml

#############################################
# Convert gpx to individual skiz components #
#############################################

# For all files
for input in *.gpx; do
  if [ -f "$fname" ]; then
    echo "No gpx files found in the folder this script was run in"
    exit 0
  fi
  # Text
  echo "Converting $input to skiz format"
  # Extract filename
  filename="${input%.*}"
  # Create directory
  mkdir -p gpx_to_skiz/"$filename"
  cp "$input" gpx_to_skiz/"$input"
  input="gpx_to_skiz/$input"
  # Modify decimal sign
  sed -i "s|,|.|g" "$input"
  # Standardize gps precision
  if ! grep -q "VDOP" "$input"; then
    if grep -q "PDOP" "$input"; then
        sed -i "s|PDOP|VDOP|g" "$input"
    elif grep -q "HDOP" "$input"; then
        sed -i "s|HDOP|VDOP|g" "$input"
    fi
  fi
  # Standardize bearing
  sed -i "s|azimuth|PATH_COURSE|g" "$input"
  sed -i "s|bearing|PATH_COURSE|g" "$input"
  # Creates Nodes.csv
  if grep -q "PATH_COURSE" "$input"; then
    # Use bearing
    gpsbabel -t -i gpx -f "$input" -x track,merge,speed -o xcsv,style=gpx_to_skiz/nodes.style -F gpx_to_skiz/"$filename"/Nodes.csv
  else
    # Calculate bearing
    gpsbabel -t -i gpx -f "$input" -x track,merge,speed,course -o xcsv,style=gpx_to_skiz/nodes.style -F gpx_to_skiz/"$filename"/Nodes.csv
  fi   
  # Create Photos.csv
  touch gpx_to_skiz/"$filename"/Photos.csv
  # Create Segment.csv
  touch gpx_to_skiz/"$filename"/Segment.csv
  # Create Track.xml
  cp gpx_to_skiz/Track.xml gpx_to_skiz/"$filename"/Track.xml
  # Create Track.xml - UID
  sed -i "s=VAR_parseObjectId=$(echo $RANDOM | md5sum | head -c 20; echo;)=g" gpx_to_skiz/"$filename"/Track.xml
  # Create Track.xml - Times
  START_TIME="$(cat gpx_to_skiz/"$filename"/Nodes.csv | awk -F "," '{ print $1 }' | head -1 | sed 's/^/@/' | xargs date +"%Y-%m-%dT%H:%M:%S%z" -d)"
  END_TIME="$(cat gpx_to_skiz/"$filename"/Nodes.csv | awk -F "," '{ print $1 }' | tail -1 | sed 's/^/@/' | xargs date +"%Y-%m-%dT%H:%M:%S%z" -d)"
  sed -i "s=VAR_start=$START_TIME=g" gpx_to_skiz/"$filename"/Track.xml
  sed -i "s=VAR_finish=$END_TIME=g" gpx_to_skiz/"$filename"/Track.xml
  sed -i "s=VAR_duration=$(($(date -d ${END_TIME%.*} +%s)-$(date -d ${START_TIME%.*} +%s))).000=g" gpx_to_skiz/"$filename"/Track.xml
  sed -i "s=VAR_tz=+${START_TIME##*+}=g" gpx_to_skiz/"$filename"/Track.xml
  sed -i "s=VAR_name=${filename}=g" gpx_to_skiz/"$filename"/Track.xml
  sed -i "s=VAR_maxspeed=$(cut -d, -f4,4 < gpx_to_skiz/"$filename"/Nodes.csv | sort -nr | head -1)=g" gpx_to_skiz/"$filename"/Track.xml
  # Create skiz
  zip -j -r gpx_to_skiz/"$filename".zip gpx_to_skiz/"$filename"/*
  mv gpx_to_skiz/"$filename".zip gpx_to_skiz/"$filename".skiz
  # Remove temporary folder
  rm "gpx_to_skiz/$input"
  rm -r gpx_to_skiz/"$filename"
done

echo "All file converted"