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annotate MakeWaypoints.kt @ 5:a725bd48bc0b

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Time stamp all waypoints.
author David Barts <n5jrn@me.com>
date Wed, 25 Aug 2021 07:44:53 -0700
parents 45be2d1d3213
children cd32e08fa37f
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1 /*
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2 * Make waypoints. In Kotlin, because the JVM has a uniquely non-sucky
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3 * way to write XML.
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4 */
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5
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6 import javax.xml.stream.*
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7 import java.io.FileOutputStream
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8 import java.text.SimpleDateFormat
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9 import java.util.Date
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10 import java.util.TimeZone
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12 private const val MYNAME = "MakeWaypoints"
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13 private const val CHARSET = "UTF-8"
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14 private val WP_TIME_FORMAT = SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'").apply {
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15 timeZone = TimeZone.getTimeZone("GMT")
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16 }
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18 fun main(args: Array<String>): Unit {
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19 if (args.size != 1) {
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20 System.err.println("${MYNAME}: expecting a single file name")
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21 System.exit(2)
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22 }
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23
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24 println("Enter waypoints below, end with empty line.")
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25 println()
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27 val outName = args[0]
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28 val invalid = "${MYNAME}: invalid entry, please try again"
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29 FileOutputStream(outName).use stream@{
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30 XMLOutputFactory.newInstance().createXMLStreamWriter(it, CHARSET).run {
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31 writeStartDocument(CHARSET, "1.0")
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32 writeStartElement("gpx")
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33 writeAttribute("creator", "MakeWaypoints")
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34 writeAttribute("version", "1.1")
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35 writeDefaultNamespace("http://www.topografix.com/GPX/1/1")
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37 while (true) {
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38 print("Longitude, latitude: ")
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39 val longLat = readLine()
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40 if (longLat.isNullOrEmpty()) {
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41 writeEndDocument()
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42 close()
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43 return@stream
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44 }
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45 val parts = longLat.split(',')
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46 if (parts.size != 2) {
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47 System.err.println(invalid)
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48 continue
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49 }
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50 val long = parts[0].trim()
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51 val lat = parts[1].trim()
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52 if (lat.toDoubleOrNull() == null || long.toDoubleOrNull() == null) {
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53 System.err.println(invalid)
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54 continue
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55 }
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56 print("Name: ")
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57 val name = readLine()
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58 if (name.isNullOrEmpty()) {
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59 System.err.println(invalid)
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60 continue
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61 }
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62 writeStartElement("wpt")
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63 writeAttribute("lat", lat)
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64 writeAttribute("lon", long)
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65 writeStartElement("time")
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66 writeCharacters(WP_TIME_FORMAT.format(Date()))
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67 writeEndElement()
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68 writeStartElement("name")
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69 writeCharacters(name)
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70 writeEndElement()
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71 writeEndElement()
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72 }
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73 }
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74 }
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75 }