Add option to display temperature in degrees Fahrenheit

Battery Time Remaining/AppDelegate.h

@@ -22,6 +22,7 @@
 #define kBTRMenuEnergySaverSetting  9
 #define kBTRMenuUpdater             10
 #define kBTRMenuQuitKey             11
+#define kBTRMenuFahrenheit           12
 
 #endif
 

Battery Time Remaining/AppDelegate.m

@@ -39,10 +39,12 @@ @interface AppDelegate ()
     BOOL isOptionKeyPressed;
     BOOL isCapacityWarning;
     BOOL showParenthesis;
+    BOOL displayFahrenheit;
 }
 
 - (void)cacheBatteryIcon;
 - (NSImage *)loadBatteryIconNamed:(NSString *)iconName;
+- (double)convertCelsiusToFahrenheit:(double)celsius;
 
 @end
 
@@ -123,11 +125,19 @@ - (void)applicationDidFinishLaunching:(NSNotification *)aNotification
     parenthesisSubmenuItem.target = self;
     showParenthesis = [[NSUserDefaults standardUserDefaults] boolForKey:@"parentheses"];
     parenthesisSubmenuItem.state = (showParenthesis) ? NSOnState : NSOffState;
+
+    // Display in Fahrenheit menu item
+    NSMenuItem *displayFahrenheitSubmenuItem = [[NSMenuItem alloc] initWithTitle:NSLocalizedString(@"Display temperature in degrees Fahrenheit", @"Display temperature in Fahrenheit setting") action:@selector(toggleFahrenheit:) keyEquivalent:@""];
+    [displayFahrenheitSubmenuItem setTag:kBTRMenuFahrenheit];
+    displayFahrenheitSubmenuItem.target = self;
+    displayFahrenheit = [[NSUserDefaults standardUserDefaults] boolForKey:@"fahrenheit"];
+    displayFahrenheitSubmenuItem.state = (displayFahrenheit) ? NSOnState : NSOffState;
 
     // Build the setting submenu
     NSMenu *settingSubmenu = [[NSMenu alloc] initWithTitle:@"Setting Menu"];
     [settingSubmenu addItem:advancedSubmenuItem];
     [settingSubmenu addItem:parenthesisSubmenuItem];
+    [settingSubmenu addItem:displayFahrenheitSubmenuItem];
 
     // Settings menu item
     NSMenuItem *settingMenu = [[NSMenuItem alloc] initWithTitle:NSLocalizedString(@"Settings", @"Settings menuitem") action:nil keyEquivalent:@""];
@@ -328,11 +338,11 @@ - (void)updateStatusItemMenu
 
         [self.statusItem.menu itemWithTag:kBTRMenuPowerSourcePercent].title = [NSString stringWithFormat: NSLocalizedString(@"%ld %% left ( %ld/%ld mAh )", @"Advanced percentage left menuitem"), self.currentPercent, [currentBatteryPower integerValue], [maxBatteryPower integerValue]];
 
-        // Each item in array will be a row in menu
+        // Each item in array will be a row in menu                                                             
         NSArray *advancedBatteryInfoTexts = [NSArray arrayWithObjects:
                                              [NSString stringWithFormat:NSLocalizedString(@"Cycle count: %ld", @"Advanced battery info menuitem"), [cycleCount integerValue]],
                                              [NSString stringWithFormat:NSLocalizedString(@"Power usage: %.2f Watt", @"Advanced battery info menuitem"), [watt doubleValue]],
-                                             [NSString stringWithFormat:NSLocalizedString(@"Temperature: %.1f°C", @"Advanced battery info menuitem"), [temperature doubleValue]],
+                                             (displayFahrenheit) ? [NSString stringWithFormat:NSLocalizedString(@"Temperature: %.1f°F", @"Advanced battery info menuitem"), [self convertCelsiusToFahrenheit:[temperature doubleValue]]] : [NSString stringWithFormat:NSLocalizedString(@"Temperature: %.1f°C", @"Advanced battery info menuitem"), [temperature doubleValue]],
                                              nil];
 
         NSDictionary *advancedAttributedStyle = [NSDictionary dictionaryWithObjectsAndKeys:
@@ -572,6 +582,28 @@ - (void)toggleParenthesis:(id)sender
    [self updateStatusItem];
 }
 
+- (void)toggleFahrenheit:(id)sender
+{
+    NSMenuItem     *item = sender;
+    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
+
+    if ([defaults boolForKey:@"fahrenheit"])
+    {
+        item.state = NSOffState;
+        displayFahrenheit = NO;
+        [defaults setBool:NO forKey:@"fahrenheit"];
+    }
+    else
+    {
+        item.state = NSOnState;
+        displayFahrenheit = YES;
+        [defaults setBool:YES forKey:@"fahrenheit"];
+    }
+    [defaults synchronize];
+
+    [self updateStatusItem];
+}
+
 - (void)notify:(NSString *)message
 {
     [self notify:@"Battery Time Remaining" message:message];
@@ -647,6 +679,11 @@ - (void)optionKeyPressed
     }
 }
 
+- (double)convertCelsiusToFahrenheit:(double)celsius
+{
+    return ((celsius * 9.0) / 5.0 + 32.0);
+}
+
 #pragma mark - NSUserNotificationCenterDelegate methods
 
 // Force show notification