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// file : build/search.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build/search>
#include <utility> // move()
#include <cassert>
#include <butl/filesystem>
#include <build/scope>
#include <build/target>
#include <build/prerequisite>
#include <build/diagnostics>
using namespace std;
using namespace butl;
namespace build
{
target*
search_existing_target (const prerequisite_key& pk)
{
tracer trace ("search_existing_target");
const target_key& tk (pk.tk);
// Look for an existing target in this directory scope.
//
dir_path d;
if (tk.dir->absolute ())
d = *tk.dir; // Already normalized.
else
{
d = pk.scope->path ();
if (!tk.dir->empty ())
{
d /= *tk.dir;
d.normalize ();
}
}
auto i (targets.find (*tk.type, d, *tk.name, *tk.ext, trace));
if (i == targets.end ())
return 0;
target& t (**i);
level4 ([&]{trace << "existing target " << t << " for prerequisite "
<< pk;});
return &t;
}
target*
search_existing_file (const prerequisite_key& cpk, const dir_paths& sp)
{
tracer trace ("search_existing_file");
prerequisite_key pk (cpk); // Make a copy so we can update extension.
target_key& tk (pk.tk);
assert (tk.dir->relative ());
// Figure out the extension. Pretty similar logic to file::derive_path().
//
const string* ext (*tk.ext);
if (ext == nullptr)
{
if (auto f = tk.type->extension)
{
ext = &f (tk, *pk.scope); // Already from the pool.
tk.ext = &ext;
}
else
{
// What should we do here, fail or say we didn't find anything?
// Current think is that if the target type didn't provide the
// default extension, then it doesn't want us to search for an
// existing file (of course, if the user specified the extension
// explicitly, we will still do so). But let me know what you
// think.
//
//fail << "no default extension for prerequisite " << pk;
level3 ([&]{trace << "no existing file found for prerequisite "
<< pk;});
return nullptr;
}
}
// Go over paths looking for a file.
//
for (const dir_path& d: sp)
{
path f (d / *tk.dir / path (*tk.name));
f.normalize ();
if (!ext->empty ())
{
f += '.';
f += *ext;
}
timestamp mt (file_mtime (f));
if (mt == timestamp_nonexistent)
continue;
level4 ([&]{trace << "found existing file " << f << " for prerequisite "
<< pk;});
// Find or insert. Note: using our updated extension.
//
auto r (targets.insert (*tk.type, f.directory (), *tk.name, ext, trace));
// Has to be a path_target.
//
path_target& t (dynamic_cast<path_target&> (r.first));
level4 ([&]{trace << (r.second ? "new" : "existing") << " target "
<< t << " for prerequisite " << pk;});
if (t.path ().empty ())
t.path (move (f));
t.mtime (mt);
return &t;
}
level3 ([&]{trace << "no existing file found for prerequisite " << pk;});
return nullptr;
}
target&
create_new_target (const prerequisite_key& pk)
{
tracer trace ("create_new_target");
const target_key& tk (pk.tk);
// We default to the target in this directory scope.
//
dir_path d;
if (tk.dir->absolute ())
d = *tk.dir; // Already normalized.
else
{
d = pk.scope->path ();
if (!tk.dir->empty ())
{
d /= *tk.dir;
d.normalize ();
}
}
// Find or insert.
//
auto r (targets.insert (*tk.type, move (d), *tk.name, *tk.ext, trace));
assert (r.second);
target& t (r.first);
level4 ([&]{trace << "new target " << t << " for prerequisite " << pk;});
return t;
}
}
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