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// file : build/trace -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef BUILD_TRACE
#define BUILD_TRACE
#include <cstdint>
#include <iostream>
namespace build
{
// 1 - command lines to update explicit targets (e.g., .o)
// 2 - command lines to update implicit targets (e.g., .d)
// 3 - things didn't work out (e.g., rule did not match)
// 4 - additional information
// 5 - more additional information
//
extern std::uint8_t verb;
struct tracer
{
explicit
tracer (const char* name): name_ (name) {}
struct record
{
~record () {if (!empty_) std::cerr << std::endl;}
template <typename T>
std::ostream&
operator<< (const T& x) const
{
return std::cerr << x;
}
// Movable-only type.
//
explicit record (bool e = true): empty_ (e) {}
record (record&& r) {empty_ = r.empty_; r.empty_ = true;}
record& operator= (record&& r) {empty_ = r.empty_; r.empty_ = true;}
record (const record&) = delete;
record& operator= (const record&) = delete;
private:
mutable bool empty_;
};
template <typename T>
record
operator<< (const T& x) const
{
std::cerr << "trace: " << name_ << ": " << x;
return record (false);
}
private:
const char* name_;
};
template <typename F>
inline void
trace (std::uint8_t level, const F& f)
{
if (verb >= level)
f ();
}
}
#endif // BUILD_TRACE
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