feature request: automatically nest namespaces

[Quuxplusone]

Bugzilla Link	PR24901
Status	NEW
Importance	P enhancement
Reported by	Gonzalo BG (gonzalo.gadeschi@gmail.com)
Reported on	2015-09-21 10:57:23 -0700
Last modified on	2017-02-21 03:33:25 -0800
Version	unspecified
Hardware	All All
CC	alexfh@google.com, djasper@google.com, edwin.vane@intel.com, eugene.zelenko@gmail.com, klimek@google.com
Fixed by commit(s)
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In C++ >= 17 one can nest different namespace definitions, so it would be nice
to have a tool that automatically transforms

namespace A {
namespace B {

// watch out with comments
namespace C {

...

}
}
}

to

namespace A::B {

// watch out with comments
namespace C {

 ...

}
}

[Quuxplusone]

Test 2: basic functionality

Input:

namespace A {
namespace B {
namespace C {

/// Doc comment
namespace D {
  // ...
}

}
}
}

Output:

namespace A::B::C {

/// Doc comment
namespace D {
  // ...
}

}

Test 3: play well with other clang-tidy checks, like e.g. google/;lvm-namespace-
comment

Input:

namespace A {
namespace B {
namespace C {

/// Doc comment
namespace D {
  // ...
}  // namespace D

}  // namespace C
}  // namespace B
}  // namespace A

Output

namespace A::B::C {

/// Doc comment
namespace D {
  // ...
}  // namespace D

}  // namespace A::B::C