https://issues.dlang.org/show_bug.cgi?id=21858

          Issue ID: 21858
           Summary: std.format: centering output
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: bugzilla@bernis-buecher.de

It would be nice, if it were possible to center output with format. I suggest to use a '=' flag for that, similar to the '-' flag.

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