Commits on Jan 23, 2018

1. introduce debug.unique() …

   When debugging the applications that work with pools of streams
   or sockets, the debug stream often comes out interleaved making it
   impossible to distinguish between streams. It is a common knowledge
   that unique ids could be assigned to each stream and be used in
   logging to solve this. However, this solution is rather ad-hoc and
   usually applied only during manual debugging.
   
   Introduce `debug.unique([ format ])` method that returns function with
   the same signature as `debug`. This function however prepends either
   `'%d '` or `format + ' '` (depending on the presence of `format`) to the
   first argument of original `debug` function, and supplies unique
   integer as a second argument, shifting the rest to the right.
   
   Example:
   
   ```
   const debug = require('debug')('ns');
   
   class Instance {
     constructor() {
       this.debug = debug.unique('id=%d ');
     }
   
     method() {
       this.debug('method data=%j', {});
       // "id=123 method data={}"
     }
   
     attach(other) {
       this.debug('attach to=%d', other.debug.id());
       // "id=123 attach to=456"
     }
   }
   ```

   

   indutny committed Jan 23, 2018
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