Support Fahrenheit (issue #620)

NEWS

@@ -9,6 +9,7 @@ Enhancements and new features:
 
     * Allow export of Docker and sensors plugins stats to InfluxDB, StatsD... (issue #600)
     * Server password configuration for the browser mode (issue #500)
+    * Support Fahrenheit unit in the sensor plugin using the --fahrenheit command line option (issue #620) 
     * Display an error if export is not used in the standalone/client mode (issue #614)  
 
 Version 2.4.2

conf/glances.conf

@@ -96,7 +96,7 @@ critical=90
 #allow=zfs
 
 [sensors]
-# Sensors core limits
+# Sensors core limits (in Celsius...)
 # Default values if not defined: 60/70/80
 temperature_core_careful=60
 temperature_core_warning=70

glances/core/glances_main.py

@@ -188,6 +188,8 @@ Start the client browser (browser mode):\n\
                                 dest='process_tree', help='display processes as a tree')
         parser.add_argument('-b', '--byte', action='store_true', default=False,
                             dest='byte', help='display network rate in byte per second')
+        parser.add_argument('--fahrenheit', action='store_true', default=False,
+                            dest='fahrenheit', help='display temperature in Fahrenheit (default is Celsius)')
         parser.add_argument('-1', '--percpu', action='store_true', default=False,
                             dest='percpu', help='start Glances in per CPU mode')
         parser.add_argument('--fs-free-space', action='store_false', default=False,

glances/plugins/glances_sensors.py

@@ -194,8 +194,15 @@ class Plugin(GlancesPlugin):
                     msg = "{0:12} {1:3}".format(label[:11], i['unit'])
                 except (KeyError, UnicodeEncodeError):
                     msg = "{0:16}".format(label[:15])
+                if args.fahrenheit:
+                    msg = msg.replace('°C', '°F')
                 ret.append(self.curse_add_line(msg))
-                msg = '{0:>7}'.format(i['value'])
+                if args.fahrenheit:
+                    # Convert Celsius to Fahrenheit
+                    # T(°F) = T(°C) × 1.8 + 32
+                    msg = '{0:>7}'.format(i['value'] * 1.8 + 32)
+                else:
+                    msg = '{0:>7}'.format(i['value'])
                 ret.append(self.curse_add_line(
                     msg, self.get_views(item=i[self.get_key()],
                                         key='value',