[SOLVED] How do you split up OSLogMessage parameters to avoid a line length violation with SwiftLint?

How do you split up OSLogMessage parameters to avoid a line length violation with SwiftLint?

I just installed SwiftLint and integrated it with Xcode. I'm trying to resolve a line length violation for the following line:

Log.persistence.debug("Initialized \(self.instances.value.count) instances of type \(CoreDataEntity.self, privacy: .public) from CoreData.")

SwiftLint shows:

Line Length Violation: Line should be 120 characters or less: currently 152 characters (line_length)

I tried to resolve this by splitting up the message string using the +operator, but that did not work:

Log.persistence.error("Instances of type \(CoreDataEntity.self, privacy: .public) "
                      + "could not be initialized from CoreData.")

results in a compiler error:

Cannot convert value of type 'String' to expected argument type 'OSLogMessage'

Of course I could just customize the SwiftLint rule to ignore interpolated strings (which would work), but I'd prefer to somehow split up the messages instead. Any ideas about this?

Solution

You could use a multiline string literal. Break the string literal up into multiple lines and put a backslash character (\) at the end of a line when you don't want to include the line break in the string, like this:

Log.persistence.debug(
    """
    Initialized \(self.instances.value.count) instances \
    of type \(CoreDataEntity.self, privacy: .public) \
    from CoreData.
    """
)