[Issue 11737] New: Allow optional string value for getopt switches

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11737

           Summary: Allow optional string value for getopt switches
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: arttu.h at yandex.com


--- Comment #0 from arttu.h at yandex.com 2013-12-13 20:46:20 PST ---
Say you want a command line switch like --log. This should enable logging to a
predefined file default.log. User should also be able to use --log=somefile.log
to define where things should be logged.

I tried to achieve this with getopt, but couldn't find a way for it. Adding
--log twice to getopt doesn't work as it just throws an exception if the given
value doesn't fit whatever was added first.

Perhaps there are some workarounds for this such as using config.passThrough
and manually handling --log. However, as this is quite common in command-line
parsing, it would be a nice addition to getopt.

One way this could be achieved: allow an option that takes a string value, but
can be used without a value, in which case the string is set to a default
value.

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