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