Initial proof of concept of substituting GPS var in form.

la5nta · Mar 13, 2022 · f926df8 · f926df8
1 parent ccb4934
commit f926df8
Showing 1 changed file with 50 additions and 0 deletions.
diff --git a/internal/forms/forms.go b/internal/forms/forms.go
@@ -30,6 +30,7 @@ import (
 	"unicode/utf8"
 
 	"github.com/dimchansky/utfbom"
+	"github.com/la5nta/pat/internal/gpsd"
 )
 
 const (
@@ -704,6 +705,49 @@ func (m *Manager) findAbsPathForTemplatePath(tmplPath string) (string, error) {
 	return retVal, nil
 }
 
+func gpsPos(decimal bool, signed bool) string {
+	// return current GPS position in one of these alternative formats:
+	// decimal=false:              degrees-minutes.seconds w/Northing and Easting
+	// decimal=true, signed=false: degrees.fraction w/Northing and Easting
+	// decimal=true, signed=true:  degrees.fraction w/minus sign for South and West
+
+	// documentation: https://www.winlink.org/sites/default/files/RMSE_FORMS/insertion_tags.zip
+	// <GPS> - Inserts the current GPS location (if available)
+	// Ex: 46-22.77N 121-35.01W
+	// <GPS_DECIMAL> - Inserts the current GPS location (if available)
+	// Ex: 46-22.77N 121-35.01W (this example is probably incorrect)
+	// Ex: 46.3795N 121.5835W
+	// <GPS_SIGNED_DECIMAL> - Inserts the current GPS location as a signed decimal latitude/longitude (if available)
+	// Ex: 46.3795 -121.5835
+
+
+	addr := "localhost:2947" // TODO: get from config
+	if addr != "" {
+		conn, err := gpsd.Dial(addr)
+		if err != nil {
+			log.Fatalf("GPSd daemon: %s", err)
+		}
+		defer conn.Close()
+
+		conn.Watch(true)
+
+		log.Println("Waiting for position from GPSd...") // TODO: Spinning bar?
+		pos, err := conn.NextPos()
+		if err != nil {
+			log.Fatalf("GPSd: %s", err)
+		}
+
+		log.Printf("GPS pos: %f %f", pos.Lat, pos.Lon)
+		if decimal && signed {
+			return fmt.Sprintf("%f %f", pos.Lat, pos.Lon)
+		} else {
+			return "TBD"
+		}
+	} else {
+		return "(Not available)"
+	}
+}
+
 func (m *Manager) fillFormTemplate(absPathTemplate string, formDestURL string, placeholderRegEx *regexp.Regexp, formVars map[string]string) (string, error) {
 	fUnsanitized, err := os.Open(absPathTemplate)
 	if err != nil {
@@ -732,6 +776,9 @@ func (m *Manager) fillFormTemplate(absPathTemplate string, formDestURL string, p
 	nowDateUTC := now.UTC().Format("2006-01-02Z")
 	nowTimeUTC := now.UTC().Format("15:04:05Z")
 	udtg := strings.ToUpper(now.UTC().Format("021504Z Jan 2006"))
+	nowGPS := gpsPos(false, false)
+	nowGPSDecimal := gpsPos(true, false)
+	nowGPSSignedDecimal := gpsPos(true, true)
 
 	scanner := bufio.NewScanner(bytes.NewReader(sanitizedFileContent))
 	for scanner.Scan() {
@@ -749,6 +796,9 @@ func (m *Manager) fillFormTemplate(absPathTemplate string, formDestURL string, p
 		l = strings.ReplaceAll(l, "{UDTG}", udtg)
 		l = strings.ReplaceAll(l, "{Time}", nowTime)
 		l = strings.ReplaceAll(l, "{UTime}", nowTimeUTC)
+		l = strings.ReplaceAll(l, "{GPS}", nowGPS)
+		l = strings.ReplaceAll(l, "{GPS_DECIMAL}", nowGPSDecimal)
+		l = strings.ReplaceAll(l, "{GPS_SIGNED_DECIMAL}", nowGPSSignedDecimal)
 		if placeholderRegEx != nil {
 			l = fillPlaceholders(l, placeholderRegEx, formVars)
 		}