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// file : build/cli/module.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build/cli/module>
#include <butl/process>
#include <butl/fdstream>
#include <build/scope>
#include <build/target>
#include <build/variable>
#include <build/diagnostics>
#include <build/cxx/target>
#include <build/config/utility>
#include <build/cli/target>
#include <build/cli/rule>
using namespace std;
using namespace butl;
namespace build
{
namespace cli
{
static compile compile_;
extern "C" bool
cli_init (scope& root,
scope& base,
const location& loc,
std::unique_ptr<module>&,
bool first,
bool optional)
{
tracer trace ("cli::init");
level5 ([&]{trace << "for " << base.out_path ();});
// Make sure the cxx module has been loaded since we need its
// targets types (?xx{}). Note that we don't try to load it
// ourselves because of the non-trivial variable merging
// semantics. So it is better to let the user load cxx
// explicitly.
//
{
auto l (base["cxx.loaded"]);
if (!l || !as<bool> (*l))
fail (loc) << "cxx module must be loaded before cli";
}
// Enter module variables.
//
if (first)
{
auto& v (var_pool);
v.find ("config.cli.configured", bool_type);
v.find ("config.cli", string_type); //@@ VAR type
v.find ("config.cli.options", strings_type);
v.find ("cli.options", strings_type);
}
// Register target types.
//
{
auto& t (base.target_types);
t.insert<cli> ();
t.insert<cli_cxx> ();
}
// Configure.
//
// The plan is as follows: try to configure the module. If this fails,
// we are using default values, and the module is optional, leave it
// unconfigured.
//
// We will only honor optional if the user didn't specify any cli
// configuration explicitly.
//
optional = optional && !config::specified (root, "config.cli");
// Don't re-run tests if the configuration says we are unconfigured.
//
if (optional)
{
auto l (root["config.cli.configured"]);
if (l && !as<bool> (*l))
return false;
}
// config.cli
//
if (first)
{
// Return version or empty string if unable to execute (e.g.,
// the cli executable is not found).
//
auto test = [optional] (const char* cli) -> string
{
const char* args[] = {cli, "--version", nullptr};
if (verb >= 2)
print_process (args);
else if (verb)
text << "test " << cli;
string ver;
try
{
process pr (args, 0, -1); // Open pipe to stdout.
ifdstream is (pr.in_ofd);
// The version should be the last word on the first line.
//
getline (is, ver);
auto p (ver.rfind (' '));
if (p != string::npos)
ver = string (ver, p + 1);
is.close (); // Don't block the other end.
if (!pr.wait ())
return string (); // Not found.
if (ver.empty ())
fail << "unexpected output from " << cli;
return ver;
}
catch (const process_error& e)
{
// In some cases this is not enough (e.g., the runtime linker
// will print scary errors if some shared libraries are not
// found. So it would be good to redirect child's STDERR.
//
if (!optional)
error << "unable to execute " << cli << ": " << e.what ();
if (e.child ())
exit (1);
throw failed ();
}
};
string ver;
const char* cli ("cli"); // Default.
if (optional)
{
// Test the default value before setting any config.cli.* values
// so that if we fail to configure, nothing will be written to
// config.build.
//
ver = test (cli);
if (ver.empty ())
{
// Note that we are unconfigured so that we don't keep re-testing
// this on each run.
//
root.assign ("config.cli.configured") = false;
if (verb >= 2)
text << cli << " not found, leaving cli module unconfigured";
return false;
}
else
{
auto p (config::required (root, "config.cli", cli));
assert (p.second && as<string> (p.first) == cli);
}
}
else
{
auto p (config::required (root, "config.cli", cli));
// If we actually set a new value, test it by trying to execute.
//
if (p.second)
{
cli = as<string> (p.first).c_str ();
ver = test (cli);
if (ver.empty ())
throw failed ();
}
}
// Clear the unconfigured flag, if any.
//
root.assign ("config.cli.configured") = true;
if (!ver.empty () && verb >= 2)
text << cli << " " << ver;
}
// config.cli.options
//
// This one is optional. We also merge it into the corresponding
// cli.* variables. See the cxx module for more information on
// this merging semantics and some of its tricky aspects.
//
if (const value& v = config::optional (root, "config.cli.options"))
base.assign ("cli.options") += as<strings> (v);
// Register our rules.
//
{
auto& r (base.rules);
r.insert<cli_cxx> (perform_update_id, "cli.compile", compile_);
r.insert<cli_cxx> (perform_clean_id, "cli.compile", compile_);
r.insert<cxx::hxx> (perform_update_id, "cli.compile", compile_);
r.insert<cxx::hxx> (perform_clean_id, "cli.compile", compile_);
r.insert<cxx::cxx> (perform_update_id, "cli.compile", compile_);
r.insert<cxx::cxx> (perform_clean_id, "cli.compile", compile_);
r.insert<cxx::ixx> (perform_update_id, "cli.compile", compile_);
r.insert<cxx::ixx> (perform_clean_id, "cli.compile", compile_);
// Other rules (e.g., cxx::compile) may need to have the group
// members resolved. Looks like a general pattern: groups should
// resolve on configure(update).
//
r.insert<cli_cxx> (configure_update_id, "cli.compile", compile_);
}
return true;
}
}
}
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