mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 18:37:58 +03:00
132 lines
3.9 KiB
C++
132 lines
3.9 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Assertions.h>
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#include <AK/ByteBuffer.h>
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#include <AK/String.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <LibMarkdown/Document.h>
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#include <fcntl.h>
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#include <spawn.h>
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#include <stdio.h>
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#include <sys/ioctl.h>
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#include <sys/wait.h>
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#include <unistd.h>
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static ErrorOr<pid_t> pipe_to_pager(String const& command)
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{
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char const* argv[] = { "sh", "-c", command.characters(), nullptr };
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auto stdout_pipe = TRY(Core::System::pipe2(O_CLOEXEC));
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posix_spawn_file_actions_t action;
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posix_spawn_file_actions_init(&action);
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posix_spawn_file_actions_adddup2(&action, stdout_pipe[0], STDIN_FILENO);
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pid_t pid;
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if ((errno = posix_spawnp(&pid, argv[0], &action, nullptr, const_cast<char**>(argv), environ))) {
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perror("posix_spawn");
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exit(1);
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}
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posix_spawn_file_actions_destroy(&action);
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TRY(Core::System::dup2(stdout_pipe[1], STDOUT_FILENO));
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TRY(Core::System::close(stdout_pipe[1]));
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TRY(Core::System::close(stdout_pipe[0]));
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return pid;
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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int view_width = 0;
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if (isatty(STDOUT_FILENO)) {
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struct winsize ws;
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0)
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view_width = ws.ws_col;
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}
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if (view_width == 0)
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view_width = 80;
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TRY(Core::System::pledge("stdio rpath exec proc"));
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TRY(Core::System::unveil("/usr/share/man", "r"));
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TRY(Core::System::unveil("/bin", "x"));
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TRY(Core::System::unveil(nullptr, nullptr));
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const char* section = nullptr;
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const char* name = nullptr;
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const char* pager = nullptr;
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Read manual pages. Try 'man man' to get started.");
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args_parser.add_positional_argument(section, "Section of the man page", "section", Core::ArgsParser::Required::No);
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args_parser.add_positional_argument(name, "Name of the man page", "name");
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args_parser.add_option(pager, "Pager to pipe the man page to", "pager", 'P', "pager");
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args_parser.parse(arguments);
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auto make_path = [name](const char* section) {
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return String::formatted("/usr/share/man/man{}/{}.md", section, name);
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};
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if (!section) {
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const char* sections[] = {
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"1",
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"2",
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"3",
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"4",
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"5",
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"6",
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"7",
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"8"
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};
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for (auto s : sections) {
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String path = make_path(s);
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if (access(path.characters(), R_OK) == 0) {
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section = s;
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break;
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}
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}
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if (!section) {
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warnln("No man page for {}", name);
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exit(1);
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}
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}
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auto filename = make_path(section);
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String pager_command;
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if (pager)
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pager_command = pager;
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else
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pager_command = String::formatted("less -P 'Manual Page {}({}) line %l?e (END):.'", StringView(name).replace("'", "'\\''"), StringView(section).replace("'", "'\\''"));
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pid_t pager_pid = TRY(pipe_to_pager(pager_command));
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auto file = TRY(Core::File::open(filename, Core::OpenMode::ReadOnly));
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TRY(Core::System::pledge("stdio proc"));
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dbgln("Loading man page from {}", file->filename());
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auto buffer = file->read_all();
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auto source = String::copy(buffer);
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outln("{}({})\t\tSerenityOS manual", name, section);
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auto document = Markdown::Document::parse(source);
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VERIFY(document);
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String rendered = document->render_for_terminal(view_width);
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out("{}", rendered);
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// FIXME: Remove this wait, it shouldn't be necessary but Shell does not
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// resume properly without it. This wait also breaks <C-z> backgrounding
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fclose(stdout);
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int wstatus;
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waitpid(pager_pid, &wstatus, 0);
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return 0;
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}
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