143 lines
3.0 KiB
C++
143 lines
3.0 KiB
C++
#pragma once
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#include <boost/format.hpp>
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#include <string>
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#include "ansicolor.hh"
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namespace nix {
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/* Inherit some names from other namespaces for convenience. */
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using boost::format;
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/* A variadic template that does nothing. Useful to call a function
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for all variadic arguments but ignoring the result. */
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struct nop { template<typename... T> nop(T...) {} };
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/* A helper for formatting strings. ‘fmt(format, a_0, ..., a_n)’ is
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equivalent to ‘boost::format(format) % a_0 % ... %
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... a_n’. However, ‘fmt(s)’ is equivalent to ‘s’ (so no %-expansion
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takes place). */
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template<class F>
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inline void formatHelper(F & f)
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{
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}
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template<class F, typename T, typename... Args>
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inline void formatHelper(F & f, const T & x, const Args & ... args)
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{
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formatHelper(f % x, args...);
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}
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inline std::string fmt(const std::string & s)
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{
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return s;
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}
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inline std::string fmt(const char * s)
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{
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return s;
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}
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template<typename... Args>
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inline std::string fmt(const std::string & fs, const Args & ... args)
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{
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boost::format f(fs);
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f.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
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formatHelper(f, args...);
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return f.str();
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}
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// -----------------------------------------------------------------------------
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// format function for hints in errors. same as fmt, except templated values
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// are always in yellow.
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template <class T>
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struct yellowtxt
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{
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yellowtxt(const T &s) : value(s) {}
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const T & value;
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};
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template <class T>
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std::ostream & operator<<(std::ostream & out, const yellowtxt<T> & y)
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{
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return out << ANSI_WARNING << y.value << ANSI_NORMAL;
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}
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template <class T>
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struct normaltxt
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{
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normaltxt(const T & s) : value(s) {}
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const T & value;
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};
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template <class T>
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std::ostream & operator<<(std::ostream & out, const normaltxt<T> & y)
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{
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return out << ANSI_NORMAL << y.value;
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}
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class hintformat
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{
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public:
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hintformat(const std::string & format) : fmt(format)
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{
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fmt.exceptions(boost::io::all_error_bits ^
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boost::io::too_many_args_bit ^
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boost::io::too_few_args_bit);
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}
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hintformat(const hintformat & hf)
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: fmt(hf.fmt)
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{ }
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hintformat(format && fmt)
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: fmt(std::move(fmt))
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{ }
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template<class T>
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hintformat & operator%(const T & value)
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{
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fmt % yellowtxt(value);
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return *this;
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}
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template<class T>
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hintformat & operator%(const normaltxt<T> & value)
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{
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fmt % value.value;
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return *this;
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}
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std::string str() const
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{
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return fmt.str();
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}
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private:
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format fmt;
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};
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std::ostream & operator<<(std::ostream & os, const hintformat & hf);
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template<typename... Args>
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inline hintformat hintfmt(const std::string & fs, const Args & ... args)
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{
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hintformat f(fs);
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formatHelper(f, args...);
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return f;
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}
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inline hintformat hintfmt(const std::string & plain_string)
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{
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// we won't be receiving any args in this case, so just print the original string
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return hintfmt("%s", normaltxt(plain_string));
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}
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}
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