Rearrange json DB stuff so it can work with CSV input.

tools/vrs-to-csv.py

@@ -0,0 +1,31 @@
+#!/usr/bin/env python2
+
+#
+# Converts a Virtual Radar Server BasicAircraftLookup.sqb database
+# to a CSV file suitable for feeding to csv-to-json.py
+#
+
+import sqlite3, csv, sys
+from contextlib import closing
+
+def extract(dbfile):
+    writer = csv.DictWriter(sys.stdout,
+                            fieldnames=['icao24', 'r', 't'])
+    writer.writeheader()
+    with closing(sqlite3.connect(dbfile)) as db:
+        with closing(db.execute('SELECT a.Icao, a.Registration, m.Icao FROM Aircraft a, Model m WHERE a.ModelID = m.ModelID')) as c:
+            for icao24, reg, icaotype in c:
+                writer.writerow({
+                    'icao24': icao24,
+                    'r': reg,
+                    't': icaotype
+                })
+
+if __name__ == '__main__':
+    if len(sys.argv) < 2:
+        print >>sys.stderr, 'Reads a VRS sqlite database and writes a CSV to stdout'
+        print >>sys.stderr, 'Syntax: %s <path to BasicAircraftLookup.sqb>' % sys.argv[0]
+        sys.exit(1)
+    else:
+        extract(sys.argv[1])
+        sys.exit(0)