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variadic args for hint format

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This commit is contained in:
Ben Burdette 2020-04-03 08:48:20 -06:00
parent c6b3fcddb0
commit 7b7801d3f0
3 changed files with 30 additions and 16 deletions
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26
src/libutil/error.hh
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@ -7,6 +7,7 @@
#include <iostream>
#include <iomanip>
#include "types.hh"
#include <boost/format.hpp>
namespace nix
@ -234,7 +235,7 @@ protected:
// ----------------------------------------------------------------
// format for hints. same as boost format, except templated values
// format for hints. same as fmt, except templated values
// are always in yellow.
template <class T>
@ -251,20 +252,25 @@ std::ostream& operator<<(std::ostream &out, const yellowify<T> &y)
return out << ANSI_YELLOW << y.value << ANSI_NORMAL;
}
class hintfmt
class hintformat
{
public:
hintfmt(string format) :fmt(format)
hintformat(string format) :fmt(format)
{
fmt.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
}
template<class T>
hintfmt& operator%(const T &value)
hintformat& operator%(const T &value)
{
fmt % yellowify(value);
return *this;
}
std::string str() const
{
return fmt.str();
}
template <typename U>
friend class AddHint;
private:
@ -272,14 +278,22 @@ private:
};
template<typename... Args>
inline hintformat hintfmt(const std::string & fs, const Args & ... args)
{
hintformat f(fs);
formatHelper(f, args...);
return f;
}
// the template layer for adding a hint.
template <class T>
class AddHint : private T
{
public:
T& hint(hintfmt &hfmt)
T& hint(const hintformat &hf)
{
GetEI().hint = std::optional(hfmt.fmt.str());
GetEI().hint = std::optional(hf.str());
return *this;
}
T& nohint()