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// file : build2/version/rule.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build2/version/rule>
#include <build2/scope>
#include <build2/target>
#include <build2/context>
#include <build2/algorithm>
#include <build2/filesystem>
#include <build2/diagnostics>
#include <build2/version/module>
using namespace std;
using namespace butl;
namespace build2
{
namespace version
{
match_result version_doc::
match (action a, target& xt, const string&) const
{
tracer trace ("version::version_file::match");
doc& t (static_cast<doc&> (xt));
// We match any doc{} target that is called version (potentially with
// some extension and different case) and that has a dependency on a
// file called manifest from the same project's src_root.
//
if (casecmp (t.name, "version") != 0)
{
l4 ([&]{trace << "name mismatch for target " << t;});
return false;
}
const scope& rs (t.root_scope ());
for (prerequisite_member p: group_prerequisite_members (a, t))
{
if (!p.is_a<file> ())
continue;
const target& pt (p.search (t));
if (pt.name != "manifest")
continue;
const scope* prs (pt.base_scope ().root_scope ());
if (prs == nullptr || prs != &rs || pt.dir != rs.src_path ())
continue;
return true;
}
l4 ([&]{trace << "no manifest prerequisite for target " << t;});
return false;
}
recipe version_doc::
apply (action a, target& xt) const
{
doc& t (static_cast<doc&> (xt));
// Derive file names for the members.
//
t.derive_path ();
// Inject dependency on the output directory.
//
inject_fsdir (a, t);
// Match prerequisite members.
//
match_prerequisite_members (a, t);
switch (a)
{
case perform_update_id: return &perform_update;
case perform_clean_id: return &perform_clean; // Standard clean.
default: return noop_recipe; // Configure update.
}
}
target_state version_doc::
perform_update (action a, const target& xt)
{
const doc& t (xt.as<const doc&> ());
const path& f (t.path ());
const scope& rs (t.root_scope ());
const module& m (*rs.modules.lookup<module> (module::name));
// Determine if anything needs to be updated.
//
// While we use the manifest file to decide whether we need to
// regenerate the version file, the version itself we get from the
// module (we checked above that manifest and version files are in the
// same project).
//
// That is, unless we patched the snapshot information in, in which case
// we have to compare the contents.
//
{
auto p (execute_prerequisites (a, t, t.load_mtime ()));
if (!p.first)
{
if (!m.version_patched || !exists (f))
return p.second;
try
{
ifdstream ifs (f, fdopen_mode::in, ifdstream::badbit);
string s;
getline (ifs, s);
if (s == m.version.string_project ())
return p.second;
}
catch (const io_error& e)
{
fail << "unable to read " << f << ": " << e;
}
}
}
if (verb >= 2)
text << "cat >" << f;
try
{
ofdstream ofs (f);
ofs << m.version.string_project () << endl;
ofs.close ();
}
catch (const io_error& e)
{
fail << "unable to write " << f << ": " << e;
}
t.mtime (system_clock::now ());
return target_state::changed;
}
}
}
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