libformat/libformat/format.cxx


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// file: libformat/format.cxx -*- C++ -*-

#include <libformat/format.hxx>

#include <cctype>     // to{upper,lower}()
#include <algorithm>  // transform()

using namespace std;

namespace format
{
  string
  message (const string& g, const string& n, volume v)
  {
    string r (g);

    auto tr = [&r] (char (*t) (char))
    {
      transform (r.begin (), r.end (), r.begin (), t);
    };

    switch (v)
    {
    case volume::quiet:  tr ([](char c) -> char {return tolower (c);}); break;
    case volume::normal:                                                break;
    case volume::loud:   tr ([](char c) -> char {return toupper (c);}); break;
    }

    return r += ", " + n + '!';
  }
}