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/* vim: set sw=4 sts=4 et foldmethod=syntax : */
/*
* Copyright (c) 2012 David Leverton
*
* This file is part of the Paludis package manager. Paludis is free software;
* you can redistribute it and/or modify it under the terms of the GNU General
* Public License version 2, as published by the Free Software Foundation.
*
* Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "cmd_print_checksum.hh"
#include "command_command_line.hh"
#include <paludis/util/digest_registry.hh>
#include <paludis/util/fs_path.hh>
#include <paludis/util/safe_ifstream.hh>
#include <paludis/util/upper_lower.hh>
#include <paludis/args/do_help.hh>
#include <cstdlib>
#include <iostream>
#include <sstream>
using namespace paludis;
using namespace paludis::cave;
namespace
{
struct PrintChecksumCommandLine :
CaveCommandCommandLine
{
args::ArgsGroup g_input;
args::SwitchArg a_stdin;
args::StringArg a_file;
args::StringArg a_text;
PrintChecksumCommandLine() :
g_input(main_options_section(), "Input Options", "Input Options"),
a_stdin(&g_input, "stdin", 's', "Calculate the checksum of standard input.", false),
a_file(&g_input, "file", 'f', "Calculate the checksum of the contents of the specified file."),
a_text(&g_input, "text", 't', "Calculate the checksum of the specified text.")
{
add_usage_line("ALGORITHM --stdin");
add_usage_line("ALGORITHM --file FILENAME");
add_usage_line("ALGORITHM --text TEXT");
}
virtual std::string app_name() const
{
return "cave print-checksum";
}
virtual std::string app_synopsis() const
{
return "prints cryptographic checksums";
}
virtual std::string app_description() const
{
return "Prints the checksum of the specified input using the specified algorithm. No formatting "
"is used, making the output suitable for parsing by scripts.";
}
};
}
int
PrintChecksumCommand::run(const std::shared_ptr<Environment> &,
const std::shared_ptr<const Sequence<std::string> > & args)
{
PrintChecksumCommandLine cmdline;
cmdline.run(args, "CAVE", "CAVE_PRINT_CHECKSUM_OPTIONS", "CAVE_PRINT_CHECKSUM_CMDLINE");
if (cmdline.a_help.specified())
{
std::cout << cmdline;
return EXIT_SUCCESS;
}
if (std::distance(cmdline.begin_parameters(), cmdline.end_parameters()) != 1)
throw args::DoHelp("print-checksum takes exactly one parameter");
std::string algo(toupper(*cmdline.begin_parameters()));
DigestRegistry::Function f(DigestRegistry::get_instance()->get(algo));
if (! f)
throw args::DoHelp("algorithm '" + algo + "' is not supported");
if (cmdline.a_stdin.specified() + cmdline.a_file.specified() + cmdline.a_text.specified() != 1)
throw args::DoHelp("print-checksum requires exactly one of --stdin, --file or --text");
std::string result;
if (cmdline.a_stdin.specified())
result = f(std::cin);
else if (cmdline.a_file.specified())
{
SafeIFStream s(FSPath(cmdline.a_file.argument()));
result = f(s);
}
else if (cmdline.a_text.specified())
{
std::istringstream s(cmdline.a_text.argument());
result = f(s);
}
std::cout << result << std::endl;
return EXIT_SUCCESS;
}
std::shared_ptr<args::ArgsHandler>
PrintChecksumCommand::make_doc_cmdline()
{
return std::make_shared<PrintChecksumCommandLine>();
}
CommandImportance
PrintChecksumCommand::importance() const
{
return ci_scripting;
}
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