Add python_extras/metar2glm.py (#965)

python_extras/Makefile.mk

@@ -4,3 +4,4 @@ dist_pkgdata_DATA += python_extras/example/tstat_commit.py
 dist_pkgdata_DATA += python_extras/example/tstat_init.py
 dist_pkgdata_DATA += python_extras/volt_dump/meter_record.py
 dist_pkgdata_DATA += python_extras/volt_dump/voltdump.py
+dist_pkgdata_DATA += python_extras/metar2glm.py

python_extras/metar2glm.py

@@ -0,0 +1,72 @@
+#!/usr/local/bin/python3
+import sys
+import ucar_weather
+import datetime
+
+station_list = []
+station_data = ucar_weather.stations()
+syntax = "python3 -m metar2glm [--index|STATION ...]"
+
+n = 1
+while n < len(sys.argv):
+	if sys.argv[n] in ["-h","--help","help"]:
+		print(f"Syntax: {syntax}")
+		exit(0)
+	elif sys.argv[n] in ["--index"]:
+		print("\n".join(station_data.keys()))
+		exit(0)
+	else:
+		station_list.append(sys.argv[n])
+	n += 1
+if not station_list:
+	print(f"Syntax: {syntax}")
+	exit(1)
+
+unit_conversion = {
+	"C" : "degC",
+	"KT" : "knot",
+	"M" : "m",
+	"mb" : "mbar",
+	"deg" : "deg",
+}
+print(f"// generated by metar2glm.py on {datetime.datetime.utcnow().isoformat()}Z")
+print("""
+class weather
+{
+	char8 country;
+	char8 region;
+	char32 station;
+	double elevation[ft];
+	timestamp time;
+	double temperature[degF];
+	double dew_point[degF];
+	double wind_speed[m/s];
+	double wind_dir[deg];
+	double visibility[mile];
+	double pressure[mbar];
+	char256 clouds;
+	char1024 metar;
+	on_init "python:metar_weather.weather_init";
+}
+""")
+for station in station_list:
+	if not station in station_data.keys():
+		raise Exception(f"station '{station}' not found in metar index")
+	weather = ucar_weather.get(station)
+	print("object weather")
+	print("{")
+	for attr,data in station_data[station].items():
+		print(f"    {attr} \"{data}\";");
+	for attr,data in weather.items():
+		if not data or attr == "type":
+			continue
+		if attr == "station":
+			attr = "name"
+		if type(data) is dict and "value" in data.keys():
+			if "unit" in data.keys():
+				print(f"    {attr} {data['value']} {unit_conversion[data['unit']]};")
+			elif data['value']:
+				print(f"    {attr} \"{data['value']}\";")
+		else:
+			print(f"    {attr} \"{data}\";")
+	print("}")