Added class SSYSystemUptimer.

Author: jerrykrinock

SSYSystemUptimer.h

@@ -0,0 +1,20 @@
+#import <Foundation/Foundation.h>
+
+extern NSString* const SSYSystemUptimerErrorDomain;
+extern NSInteger const SSYSystemUptimerSystemCommandFailedErrorCode;
+extern NSInteger const SSYSystemUptimerCouldNotParseSystemResponse;
+
+@interface SSYSystemUptimer : NSObject
+
+/*!
+ @brief    Returns the last date at which the system woke from sleep
+
+ @details
+
+ @param    error_p  Pointer which will, upon return, if an error
+ occurred and said pointer is not NULL, point to an NSError
+ describing said error.
+ */
++ (NSDate*)lastWakeFromSleepError_p:(NSError**)error_p ;
+
+@end

SSYSystemUptimer.m

@@ -0,0 +1,76 @@
+#import "SSYSystemUptimer.h"
+#import "SSYShellTasker.h"
+
+NSString* const SSYSystemUptimerErrorDomain = @"SSYSystemUptimerErrorDomain";
+NSInteger const SSYSystemUptimerSystemCommandFailedErrorCode = 214751;
+NSInteger const SSYSystemUptimerCouldNotParseSystemResponse = 214752;
+
+@implementation SSYSystemUptimer
+
++ (NSDate*)lastWakeFromSleepError_p:(NSError**)error_p {
+    NSDate* answer = nil;
+    NSError* error = nil;
+
+    /* I tested using "/usr/bin/pmset -g log", but that seemed to generate
+     much more stdout than this:  */
+    NSString* command = @"/usr/sbin/sysctl";
+    NSArray* arguments = [NSArray arrayWithObjects:
+                          @"-a",
+                          nil];
+    NSData* stdoutData = nil;
+    NSInteger result = [SSYShellTasker doShellTaskCommand:command
+                                                arguments:arguments
+                                              inDirectory:nil
+                                                stdinData:nil
+                                             stdoutData_p:&stdoutData
+                                             stderrData_p:NULL
+                                                  timeout:5.0
+                                                  error_p:&error];
+    if (result != 0) {
+        error = [NSError errorWithDomain:SSYSystemUptimerErrorDomain
+                                    code:SSYSystemUptimerSystemCommandFailedErrorCode
+                                userInfo:@{
+                                           NSLocalizedDescriptionKey: NSLocalizedString(@"System command failed", nil),
+                                           @"Command": command,
+                                           @"Arguments": arguments,
+                                           @"Result": [NSNumber numberWithInteger:result],
+                                           NSUnderlyingErrorKey: error
+                                           }];
+    } else {
+        NSString* stdoutString = [[NSString alloc] initWithData:stdoutData
+                                                       encoding:NSUTF8StringEncoding] ;
+        NSArray* lines = [stdoutString componentsSeparatedByString:@"\n"];
+        for (NSString* line in lines) {
+            if ([line rangeOfString:@"waketime"].location != NSNotFound) {
+                NSScanner* scanner = [[NSScanner alloc] initWithString:line];
+                [scanner scanUpToCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet]
+                                        intoString:NULL];
+                NSString* timeString = nil;
+                [scanner scanCharactersFromSet:[NSCharacterSet decimalDigitCharacterSet]
+                                    intoString:&timeString];
+                [scanner release];
+                NSTimeInterval timeSeconds = [timeString integerValue];
+                answer = [NSDate dateWithTimeIntervalSince1970:timeSeconds];
+                break;
+            }
+        }
+
+        if (!answer) {
+            error = [NSError errorWithDomain:SSYSystemUptimerErrorDomain
+                                        code:SSYSystemUptimerCouldNotParseSystemResponse
+                                    userInfo:@{
+                                               NSLocalizedDescriptionKey: NSLocalizedString(@"Could not parse system response", nil)
+                                               }];
+        }
+
+        [stdoutString release];
+    }
+
+    if (error && error_p) {
+        *error_p = error ;
+    }
+
+    return answer;
+}
+
+@end