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// file : libbuild2/dist/rule.cxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#include <libbuild2/dist/rule.hxx>
#include <libbuild2/scope.hxx>
#include <libbuild2/target.hxx>
#include <libbuild2/algorithm.hxx>
#include <libbuild2/diagnostics.hxx>
using namespace std;
namespace build2
{
namespace dist
{
bool rule::
match (action, target&, const string&) const
{
return true; // We always match.
}
recipe rule::
apply (action a, target& t) const
{
const dir_path& out_root (t.root_scope ().out_path ());
// If we can, go inside see-through groups.
//
for (prerequisite_member p:
group_prerequisite_members (a, t, members_mode::maybe))
{
// Note: no exclusion tests, we want all of them (and see also the
// dist_include() override).
// Skip prerequisites imported from other projects.
//
if (p.proj ())
continue;
// We used to always search and match but that resulted in the
// undesirable behavior in case one of the "source" files is
// missing. In this case we would enter a target as "output", this
// rule would match it, and then dist_execute() would ignore it by
// default.
//
// So now if this is a file target (we still want to always "see
// through" other targets like aliases), we will only match it if (1)
// it exists in src or (2) it exists as a target. It feels like we
// don't need the stronger "... and not implied" condition since if it
// is mentioned as a target, then it is in out (we don't do the same
// target in both src/out).
//
// @@ Note that this is still an issue in a custom dist rule.
//
const target* pt (nullptr);
if (p.is_a<file> ())
{
pt = p.load ();
if (pt == nullptr)
{
// Search for an existing target or existing file in src.
//
const prerequisite_key& k (p.key ());
pt = k.tk.type->search (t, k);
if (pt == nullptr)
fail << "prerequisite " << k << " is not existing source file "
<< "nor known output target" << endf;
search_custom (p.prerequisite, *pt); // Cache.
}
}
else
pt = &p.search (t);
// Don't match targets that are outside of our project.
//
if (pt->dir.sub (out_root))
build2::match (a, *pt);
}
return noop_recipe; // We will never be executed.
}
}
}
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