Added method -[SSYOtherApper humanReadableElapsedRunningTimeOfPid:]/

Author: jerrykrinock

SSYOtherApper.h

@@ -260,6 +260,17 @@ __attribute__((visibility("default"))) @interface SSYOtherApper : NSObject {}
 */
 + (NSString*)descriptionOfPid:(pid_t)pid ;
 
+/*!
+ @brief    Returns the elapsed time since the process with a given process
+ identifier (pid) was launched, in a human readable English form
+
+ @result   Examples:
+ 2 days 3 hours 35 minutes 11 seconds
+ 23 minutes 8 seconds
+ 5 seconds
+ */
++ (NSString*)humanReadableElapsedRunningTimeOfPid:(pid_t)pid;
+
 /*!
  @brief    Finds a running app, owned by the current user,
  with a given bundle path, sends it a "quit application" Apple Event message,

SSYOtherApper.m

@@ -638,6 +638,113 @@ + (NSString*)descriptionOfPid:(pid_t)pid {
 	return answer ;
 }
 
++ (NSString*)humanReadableElapsedRunningTimeOfPid:(pid_t)pid {
+    NSArray* args = [NSArray arrayWithObjects:
+                     @"-www",      // Allow 4x the normal column width.  Should be enough!!
+
+                     @"-o",        // Print the following column (= means to suppress header line)
+                     @"etime=",    // elapsed running time
+
+                     @"-p",        // subject pid follows
+                     [NSString stringWithFormat:@"%ld", (long)pid],
+                     nil] ;
+
+    NSString* answer = nil ;
+    NSData* stdoutData ;
+    [SSYShellTasker doShellTaskCommand:@"/bin/ps"
+                             arguments:args
+                           inDirectory:nil
+                             stdinData:nil
+                          stdoutData_p:&stdoutData
+                          stderrData_p:NULL
+                               timeout:5.0
+                               error_p:NULL] ;
+    if (stdoutData) {
+        NSString* raw = [[NSString alloc] initWithData:stdoutData
+                                       encoding:NSUTF8StringEncoding];
+        /* raw can be one of several forms.  Here is what I got in
+         macOS 10.14.2, 2018-12-29:
+         02-02:57:50  means 2 days, 2 hours, 57 minutes and 50 seconds
+         19:29        means 19 minutes and 29 seconds
+         00:22        means 0 minutes and 22 seconds */
+
+        NSString* trimmed = [raw stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
+        [raw release];
+        NSArray* comps = [trimmed componentsSeparatedByString:@"-"];
+        NSString* days;
+        NSString* hms;
+        if (comps.count > 1) {
+            days = [comps objectAtIndex:0];
+            hms = [comps objectAtIndex:1];
+        } else {
+            days = nil;
+            hms = [comps objectAtIndex:0];
+        }
+
+        comps = [hms componentsSeparatedByString:@":"];
+        NSString* hours;
+        NSString* minutes;
+        NSString* seconds;
+        if (comps.count > 2) {
+            hours = [comps objectAtIndex:0];
+            minutes = [comps objectAtIndex:1];
+            seconds = [comps objectAtIndex:0];
+        } else if (comps.count > 1) {
+            hours = nil;
+            minutes = [comps objectAtIndex:0];
+            seconds = [comps objectAtIndex:1];
+        } else {
+            hours = nil;
+            minutes = nil;
+            seconds = [comps objectAtIndex:0];
+        }
+
+        if (hours.integerValue == 0) {
+            /* This branch will never occur with the year 2018 implementation
+             of `ps` because 0 hours are omitted.  But just in case. */
+            hours = nil;
+        }
+        if (minutes.integerValue == 0) {
+            /* This branch *will* occur with the year 2018 implementation
+             of `ps` because 0 minutes are returned by `ps` as "00".  */
+            minutes = nil;
+        }
+
+        NSMutableString* string = [[NSMutableString alloc] init];
+        if (days) {
+            [string appendString:days];
+            [string appendString:@" dayss"];
+        }
+        if (hours) {
+            if (string.length > 0) {
+                [string appendString:@" "];
+            }
+            [string appendString:hours];
+            [string appendString:@" hours"];
+        }
+        if (minutes) {
+            if (string.length > 0) {
+                [string appendString:@" "];
+            }
+            [string appendString:minutes];
+            [string appendString:@" minutes"];
+        }
+        if (seconds) {
+            if (string.length > 0) {
+                [string appendString:@" "];
+            }
+            [string appendString:seconds];
+            [string appendString:@" seconds"];
+        }
+
+        answer = [string copy];
+        [string release];
+    }
+
+    [answer autorelease];
+    return answer ;
+}
+
 + (BOOL)isProcessRunningPid:(pid_t)pid
 			   thisUserOnly:(BOOL)thisUserOnly {
 	BOOL answer = NO ;