I think it would be extremely useful to extend the android.util.Log API with the functionality of lazy String messages and default tag parameters like so

Log.i("tag") { "msg" }
// or ...
Log.i { "msg" } // where tag = the calling Class' simple name

This could look like

interface Log {
 fun i(tag: String? = null, msg: () -> String): Int
}
val Any.Log: Log
 get() = object : Log {
 override fun i(tag: String?, msg: () -> String) {
 val tag = tag ?: this@Log.javaClass.simpleName
 return if (Log.isLoggable(tag, Log.INFO)) android.util.Log.i(tag, msg()) else 0
 }
 }

This, of course, isn't ideal because we have to introduce an extension property. Even without the default tag parameter, however, due to https://youtrack.jetbrains.com/issue/KT-11968, it would have to be temporarily implemented in some other way besides a static extension function. For example,

interface KTXLog {
 fun i(tag: String, msg: () -> String): Int
}
val Log = object : KTXLog {
 override fun i(tag: String, msg: () -> String): Int {
 return if (Log.isLoggable(tag, Log.INFO)) android.util.Log.i(tag, msg()) else 0
 }
}

This is also clearly not ideal so I'm not sure if this is something that we should wait on or can just implement in one of the two ways as above for now. I'm interested to hear other thoughts on this.

Note: This is similar to #289 but doesn't simplify the API excessively and also leverages the lazy lambdas correctly. On the other hand, this version doesn't get the benefit of inlining.