NSLog tweak to create a clickable link to the file and line that created the log output. Short and concise format to fit on a single line in most cases.

gistfile1.md

Sometimes it can be hard to figure out where log statements in the console come from. With this tweak you get log output like this:

11:03:12.257 : User logged in with username: olegam (FIBAPIClient.m:507)

Because of AppCode awesomeness the FileName:LineNumber part will be clickable and take you right to the code that produced the log statement. To get this in your own project you should:

1. Redefine NSLog in your prefix.pch file

#define NSLog(format,...) SHPLogFunction(format, [@""__FILE__ lastPathComponent], __LINE__, ##__VA_ARGS__);

2. Implement the following functions in a .m file imported by Prefix.pch

NSDateFormatter *ThreadLocalLogDateFormatter() {
    NSMutableDictionary *threadCache = [[NSThread currentThread] threadDictionary];
    NSDateFormatter *df = threadCache[@"SHPLOG_DATE_FORMATTER"];
    if (!df) {
        df = [[NSDateFormatter alloc] init];
        df.dateFormat = @"HH:mm:ss.SSS";
        threadCache[@"SHPLOG_DATE_FORMATTER"] = df;
    }
    return df;
}

void SHPLogFunction(NSString *format, NSString *file, NSUInteger line, ...) {
    NSDateFormatter *df = ThreadLocalLogDateFormatter();
    NSString *timeStr = [df stringFromDate:[NSDate date]];

    va_list args;
    va_start(args, format);
    NSString *logStr = [[NSString alloc] initWithFormat:format arguments:args];
    NSString *withTimeStr = [[NSString alloc] initWithFormat:@"%@ : %@ (%@:%d)", timeStr, logStr, file, line];
    CFShow((__bridge CFStringRef)withTimeStr);
    va_end(args);
}

This solution was developed after a discussion on Youtrack: http://youtrack.jetbrains.com/issue/OC-6808