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// file : libbuild2/utility.txx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
namespace build2
{
template <typename I, typename F>
void
append_option_values (cstrings& args, const char* o, I b, I e, F&& get)
{
if (b != e)
{
args.reserve (args.size () + (e - b));
for (; b != e; ++b)
{
args.push_back (o);
args.push_back (get (*b));
}
}
}
template <typename I, typename F>
void
append_option_values (sha256& cs, const char* o, I b, I e, F&& get)
{
for (; b != e; ++b)
{
cs.append (o);
cs.append (get (*b));
}
}
template <typename K>
basic_path<char, K>
relative (const basic_path<char, K>& p)
{
typedef basic_path<char, K> path;
const dir_path& b (*relative_base);
if (p.simple () || b.empty ())
return p;
if (p.sub (b))
return p.leaf (b);
if (p.root_directory () == b.root_directory ())
{
path r (p.relative (b));
if (r.string ().size () < p.string ().size ())
return r;
}
return p;
}
template <typename T, typename F>
T
run (uint16_t verbosity,
const process_env& pe,
const char* args[],
F&& f,
bool err,
bool ignore_exit,
sha256* checksum)
{
process pr (run_start (verbosity,
pe,
args,
0 /* stdin */,
-1 /* stdout */,
err));
T r;
string l; // Last line of output.
try
{
ifdstream is (move (pr.in_ofd), butl::fdstream_mode::skip);
// Make sure we keep the last line.
//
for (bool last (is.peek () == ifdstream::traits_type::eof ());
!last && getline (is, l); )
{
last = (is.peek () == ifdstream::traits_type::eof ());
trim (l);
if (checksum != nullptr)
checksum->append (l);
if (r.empty ())
{
r = f (l, last);
if (!r.empty () && checksum == nullptr)
break;
}
}
is.close ();
}
catch (const io_error&)
{
// Presumably the child process failed. Let run_finish() deal with that.
}
if (!(run_finish (args, pr, err, l) || ignore_exit))
r = T ();
return r;
}
}
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