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// file : libbutl/default-options.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#ifndef __cpp_modules_ts
#include <libbutl/default-options.mxx>
#endif
#include <cassert>
#ifndef __cpp_lib_modules_ts
#include <vector>
#endif
// Other includes.
#ifdef __cpp_modules_ts
module butl.default_options;
// Only imports additional to interface.
#ifdef __clang__
#ifdef __cpp_lib_modules_ts
import std.core;
#endif
import butl.path;
import butl.optional;
import butl.small_vector;
#endif
#endif
using namespace std;
namespace butl
{
optional<dir_path>
default_options_start (const optional<dir_path>& home,
const vector<dir_path>& dirs)
{
if (home)
assert (home->absolute () && home->normalized ());
if (dirs.empty ())
return nullopt;
// Use the first directory as a start.
//
auto i (dirs.begin ());
dir_path d (*i);
// Try to find a common prefix for each subsequent directory.
//
for (++i; i != dirs.end (); ++i)
{
bool p (false);
for (;
!(d.root () || (home && d == *home));
d = d.directory ())
{
if (i->sub (d))
{
p = true;
break;
}
}
if (!p)
return nullopt;
}
return d;
}
}
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