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// file : bdep/help.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <bdep/help.hxx>
#include <libbutl/pager.mxx>
#include <bdep/diagnostics.hxx>
#include <bdep/bdep-options.hxx>
using namespace std;
using namespace butl;
namespace bdep
{
int
help (const help_options& o, const string& t, usage_function* usage)
{
if (usage == nullptr) // Not a command.
{
if (t.empty ()) // General help.
usage = &print_bdep_usage;
//
// Help topics.
//
else if (t == "common-options")
usage = &print_bdep_common_options_long_usage;
else
fail << "unknown bdep command/help topic '" << t << "'" <<
info << "run 'bdep help' for more information";
}
try
{
pager p ("bdep " + (t.empty () ? "help" : t),
verb >= 2,
o.pager_specified () ? &o.pager () : nullptr,
&o.pager_option ());
usage (p.stream (), cli::usage_para::none);
// If the pager failed, assume it has issued some diagnostics.
//
return p.wait () ? 0 : 1;
}
// Catch io_error as std::system_error together with the pager-specific
// exceptions.
//
catch (const system_error& e)
{
error << "pager failed: " << e;
// Fall through.
}
throw failed ();
}
}
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