From afb78e8933997db2d9fc257c1466d04d1f6e93d4 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Wed, 25 Jan 2017 13:09:27 -0500
Subject: dexcom_dumper: JSON output

---
 dexcom_reader/dexcom_dumper.py | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/dexcom_reader/dexcom_dumper.py b/dexcom_reader/dexcom_dumper.py
index b579818..bba4d17 100644
--- a/dexcom_reader/dexcom_dumper.py
+++ b/dexcom_reader/dexcom_dumper.py
@@ -1,6 +1,7 @@
 import constants
 import readdata
 import sys
+import json
 from sys import stdout, stderr
 from datetime import timedelta, datetime
 from time import sleep
@@ -20,12 +21,14 @@ parser.add_option("-p", "--poll", action="store_const", dest="command", const="p
 parser.add_option("-n", type="int", dest="num_records", default=DEFAULT_PAGE_COUNT, help="number of pages of CGM records to display")
 parser.add_option("-v", "--verbose", action="store_true", dest="verbose", help="verbosity (currently for debugging)")
 parser.add_option("-H", "--human", action="store_true", dest="human", help="print human-readable times")
+parser.add_option("-j", "--json", action="store_true", dest="json", help="print JSON output")
 
 (options, args) = parser.parse_args()
 
 command = options.command or "dump_cgm"
 VERBOSE = options.verbose
 HUMAN = options.human
+JSON = options.json
 
 def get_dexcom_reader():
         if options.g5:
@@ -108,6 +111,19 @@ def sleep_verbose(n):
         print_verbose('sleep(%d)' % n)
         sleep(n)
 
+def print_cgm_bg(now, r):
+        if JSON:
+                print json.dumps({
+                        'current_time': now.strftime('%s'),
+                        'event_time': r.system_time.strftime('%s'),
+                        'glucose': r.glucose,
+                        'trend_arrow': r.trend_arrow,
+                        'display_only': r.display_only
+                })
+        else:
+                print '%s: %s %s' % (format_times(now, r.system_time), r.glucose, r.trend_arrow)
+        stdout.flush()
+
 def poll():
         print_localtime('dexcom_dumper started')
         while True:
@@ -120,8 +136,7 @@ def poll():
                         sleep_verbose(10)
                 else:
                         now = dr.ReadSystemTime()
-                        print '%s: %s %s' % (format_times(now, r.system_time), r.glucose, r.trend_arrow)
-                        stdout.flush()
+                        print_cgm_bg(now, r)
                         next_reading = (r.system_time - now + timedelta(minutes=5, seconds=2)).total_seconds()
                         if (next_reading > 0):
                                 sleep_verbose(next_reading)
-- 
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