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// file : build2/utility.txx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
namespace build2
{
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>
T
run (const process_path& pp,
const char* args[],
T (*f) (string&),
bool err,
bool ignore_exit,
sha256* checksum)
{
process pr (run_start (pp, args, err));
T r;
string l; // Last line of output.
try
{
ifdstream is (move (pr.in_ofd));
while (is.peek () != ifdstream::traits_type::eof () && // Keep last line.
getline (is, l))
{
trim (l);
if (checksum != nullptr)
checksum->append (l);
if (r.empty ())
r = f (l);
}
}
catch (const io_error&)
{
// Presumably the child process failed. Let run_finish() deal with that.
}
if (!(run_finish (args, err, pr, l) || ignore_exit))
r = T ();
return r;
}
}
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