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// file : bpkg/utility -*- C++ -*-
// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BPKG_UTILITY
#define BPKG_UTILITY
#include <memory> // make_shared()
#include <cassert>
#include <utility> // move()
#include <exception> // uncaught_exception()
#include <butl/filesystem>
#include <bpkg/types>
namespace bpkg
{
using std::move;
using std::make_shared;
using std::to_string; // To complement bpkg::to_string().
// Y/N prompt. The def argument, if specified, should be either 'y'
// or 'no'. It is used as the default answer, in case the user just
// hits enter. Issue diagnostics and throw failed if no answer could
// be extracted from STDOUT (e.g., because it was closed).
//
bool
yn_prompt (const char* prompt, char def = '\0');
// Filesystem.
//
bool
exists (const path&);
bool
exists (const dir_path&);
bool
empty (const dir_path&);
void
mk (const dir_path&);
void
mk_p (const dir_path&);
void
rm (const path&);
void
rm_r (const dir_path&, bool dir = true);
using auto_rm = butl::auto_rmfile;
using auto_rm_r = butl::auto_rmdir;
// Process.
//
// The process command line is printed for verbosity >= 2 (essential
// command lines).
//
void
run (const char* const args[]);
inline void
run (const cstrings& args) {run (args.data ());}
// Run build2, mapping verbosity levels. If quiet is true, then
// run build2 quiet if our verbosity level is 1.
//
class common_options;
void
run_b (const common_options&,
const string& buildspec,
bool quiet = false,
const strings& vars = strings ());
// Call a function if there is an exception.
//
// True means we are in the body of a destructor that is being
// called as part of the exception stack unwindining. Used to
// compensate for the deficiencies of uncaught_exception() until
// C++17 uncaught_exceptions() becomes available.
//
// @@ MT: will have to be TLS.
//
extern bool exception_unwinding_dtor;
template <typename F>
struct exception_guard;
template <typename F>
inline exception_guard<F>
make_exception_guard (F f)
{
return exception_guard<F> (std::move (f));
}
template <typename F>
struct exception_guard
{
exception_guard (F f): f_ (std::move (f)) {}
~exception_guard ()
{
if (std::uncaught_exception ())
{
exception_unwinding_dtor = true;
f_ ();
exception_unwinding_dtor = false;
}
}
private:
F f_;
};
}
#endif // BPKG_UTILITY
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