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Diffstat (limited to 'cli/cmd_about.cpp')
| -rw-r--r-- | cli/cmd_about.cpp | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/cli/cmd_about.cpp b/cli/cmd_about.cpp new file mode 100644 index 000000000000..f2b3f99e0ada --- /dev/null +++ b/cli/cmd_about.cpp @@ -0,0 +1,160 @@ +// Copyright 2010 The Kyua Authors. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// * Neither the name of Google Inc. nor the names of its contributors +// may be used to endorse or promote products derived from this software +// without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "cli/cmd_about.hpp" + +#include <cstdlib> +#include <fstream> +#include <utility> +#include <vector> + +#include "cli/common.ipp" +#include "utils/cmdline/exceptions.hpp" +#include "utils/cmdline/parser.ipp" +#include "utils/cmdline/ui.hpp" +#include "utils/defs.hpp" +#include "utils/env.hpp" +#include "utils/format/macros.hpp" +#include "utils/fs/path.hpp" +#include "utils/sanity.hpp" +#include "utils/text/regex.hpp" + +#if defined(HAVE_CONFIG_H) +# include "config.h" +#endif + +namespace cmdline = utils::cmdline; +namespace config = utils::config; +namespace fs = utils::fs; +namespace text = utils::text; + +using cli::cmd_about; + + +namespace { + + +/// Print the contents of a document. +/// +/// If the file cannot be opened for whatever reason, an error message is +/// printed to the output of the program instead of the contents of the file. +/// +/// \param ui Object to interact with the I/O of the program. +/// \param file The file to print. +/// \param filter_re Regular expression to match the lines to print. If empty, +/// no filtering is applied. +/// +/// \return True if the file was printed, false otherwise. +static bool +cat_file(cmdline::ui* ui, const fs::path& file, + const std::string& filter_re = "") +{ + std::ifstream input(file.c_str()); + if (!input) { + ui->err(F("Failed to open %s") % file); + return false; + } + + std::string line; + if (filter_re.empty()) { + while (std::getline(input, line).good()) { + ui->out(line); + } + } else { + const text::regex filter = text::regex::compile(filter_re, 0); + while (std::getline(input, line).good()) { + if (filter.match(line)) { + ui->out(line); + } + } + } + input.close(); + return true; +} + + +} // anonymous namespace + + +/// Default constructor for cmd_about. +cmd_about::cmd_about(void) : cli_command( + "about", "[authors|license|version]", 0, 1, + "Shows detailed authors and contributors; license; and version information") +{ +} + + +/// Entry point for the "about" subcommand. +/// +/// \param ui Object to interact with the I/O of the program. +/// \param cmdline Representation of the command line to the subcommand. +/// +/// \return 0 if everything is OK, 1 if any of the necessary documents cannot be +/// opened. +int +cmd_about::run(cmdline::ui* ui, const cmdline::parsed_cmdline& cmdline, + const config::tree& /* user_config */) +{ + const fs::path docdir(utils::getenv_with_default( + "KYUA_DOCDIR", KYUA_DOCDIR)); + + bool success = true; + + static const char* list_re = "^\\* "; + + if (cmdline.arguments().empty()) { + ui->out(PACKAGE " (" PACKAGE_NAME ") " PACKAGE_VERSION); + ui->out(""); + ui->out("License terms:"); + ui->out(""); + success &= cat_file(ui, docdir / "LICENSE"); + ui->out(""); + ui->out("Brought to you by:"); + ui->out(""); + success &= cat_file(ui, docdir / "AUTHORS", list_re); + ui->out(""); + success &= cat_file(ui, docdir / "CONTRIBUTORS", list_re); + ui->out(""); + ui->out(F("Homepage: %s") % PACKAGE_URL); + } else { + const std::string& topic = cmdline.arguments()[0]; + + if (topic == "authors") { + success &= cat_file(ui, docdir / "AUTHORS", list_re); + success &= cat_file(ui, docdir / "CONTRIBUTORS", list_re); + } else if (topic == "license") { + success &= cat_file(ui, docdir / "LICENSE"); + } else if (topic == "version") { + write_version_header(ui); + } else { + throw cmdline::usage_error(F("Invalid about topic '%s'") % topic); + } + } + + return success ? EXIT_SUCCESS : EXIT_FAILURE; +} |